CN112885309A - Pixel charging method and device, display equipment and storage medium - Google Patents
Pixel charging method and device, display equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a pixel charging method, a pixel charging device, display equipment and a storage medium, wherein the method comprises the steps of determining a first time length, a second time length, a target gray scale voltage of each pixel and a pre-charging voltage of each pixel aiming at a current frame picture to be displayed; controlling pixels of each row to be precharged line by line based on the first time length and the precharge voltage, and synchronously controlling the switching devices corresponding to pixels of M adjacent rows to be in an open state when at least one row of pixels is precharged, wherein M is an integer greater than or equal to 1; after the pre-charging of the pixels in each row is finished, the pixels in each row are controlled to be charged line by line based on the second duration and the target gray scale voltage, so that the pixels in each row are charged to the corresponding target gray scale voltage, and the display of the current frame is finished. Therefore, the charging speed can be effectively increased, and the liquid crystal response time is prolonged.
Description
Technical Field
The invention relates to the technical field of displays, in particular to a pixel charging method and device, display equipment and a storage medium.
Background
With the development of liquid crystal display technology, the quality of display screens of display devices is also more and more demanding, especially for medical display devices and display devices for electronic competitions. The higher the refresh frequency that the display device can achieve, the more the number of image refreshes, the smaller the flicker of the image display, and the higher the picture quality. However, the response speed of the liquid crystal in the conventional driving method is not fast enough, so that the display device can only work at a low refresh frequency, which is not favorable for improving the picture quality.
Disclosure of Invention
The present invention has been made in view of the above problems, and has an object to provide a pixel charging method, apparatus, display device, and storage medium that overcome the above problems or at least partially solve the above problems.
In a first aspect, a pixel charging method is provided, including:
a method of charging a pixel, the method comprising:
determining a first time length, a second time length, a target gray scale voltage of each pixel and a pre-charging voltage of each pixel aiming at a current frame picture to be displayed;
controlling each row of pixels to be precharged line by line based on the first time length and the precharge voltage, and synchronously controlling the switching devices corresponding to M adjacent rows of pixels to be in an on state when at least one row of pixels is precharged, wherein M is an integer greater than or equal to 1;
and after the pre-charging of the pixels in each row is finished, controlling the pixels in each row to be charged row by row based on the second time length and the target gray scale voltage.
Optionally, the precharge voltage is greater than the target grayscale voltage, and the first duration is less than the second duration.
Optionally, in the process of controlling the pixels in each row to be charged row by row, when at least one row of pixels is charged, the switching devices corresponding to the pixels in the subsequent adjacent N rows are synchronously controlled to be in an on state, where N is an integer greater than or equal to 1, and N is less than M.
Optionally, the controlling, on the basis of the second duration and the target grayscale voltage, the pixels in each row to be charged line by line, and when at least one row of pixels is charged, synchronously controlling the switching devices corresponding to the pixels in the subsequent adjacent N rows to be in an on state includes:
if i is less than or equal to W-N, controlling the pixels of the ith row to be charged by adopting the target gray scale voltage in the second time period, and synchronously controlling the switching devices corresponding to the pixels of the (i +1) th row to the pixels of the (i + N) th row to be in an opening state, wherein i is an integer from 1 to W, and W is the number of pixel rows;
if i is larger than W-N and smaller than W, controlling the pixels in the ith row to be charged by adopting the target gray scale voltage in the second time period, and synchronously controlling the switching devices corresponding to the pixels in the (i +1) th row to the pixels in the W th row to be in an on state;
and if i is equal to W, controlling the W-th row of pixels to be charged by adopting the target gray scale voltage in the second time length.
Optionally, N is greater than or equal to 1 and less than or equal to 3.
Optionally, the controlling, on the basis of the first time length and the precharge voltage, each row of pixels to precharge row by row, and synchronously controlling the switching devices corresponding to the pixels in the adjacent M rows to be in an on state when at least one row of pixels is precharged, includes:
if j is less than or equal to W-M +1, controlling the j row of pixels to be precharged by adopting the precharge voltage in the first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the j + M row of pixels to be in an on state, wherein j is an integer from 1 to W, and W is the number of pixel rows;
if j is larger than W-M and smaller than W, controlling the j row of pixels to be precharged by the precharge voltage in the first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the W row of pixels to be in an on state;
and if j is equal to W, controlling the W-th row of pixels to be precharged with the precharge voltage for the first time period.
Optionally, the precharge voltage of each pixel is determined by the following steps:
processing the target gray scale voltage of each pixel, and determining the pre-charging reference voltage of each pixel;
and adding a preset amplification voltage to the pre-charging reference voltage to obtain the pre-charging voltage of each pixel, wherein the amplification voltage is greater than zero and less than or equal to the difference between the upper limit driving voltage and the pre-charging reference voltage, and the upper limit driving voltage is the maximum driving voltage value of the driving chip.
Optionally, the processing the target grayscale voltage of each pixel to determine the pre-charge reference voltage of each pixel includes:
dividing the pixel array into a plurality of pixel units by taking adjacent M +1 rows of pixels as a dividing reference;
and taking the average value of the target gray-scale voltage as the pre-charging reference voltage of the pixels of the corresponding row according to the row aiming at each pixel unit.
Optionally, M is 5, 8, 9 or 11.
In a second aspect, there is provided a pixel charging apparatus, the apparatus comprising:
the determining module is used for determining a first time length, a second time length, a target gray scale voltage of each pixel and a pre-charging voltage of each pixel aiming at a current frame picture to be displayed;
the first control module is used for controlling each row of pixels to be precharged line by line based on the first time length and the precharge voltage, and synchronously controlling the switching devices corresponding to M adjacent rows of pixels to be in an open state when at least one row of pixels is precharged, wherein M is an integer greater than or equal to 1;
and the second control module is used for controlling the pixels of each row to be charged line by line based on the second duration and the target gray scale voltage after the pre-charging of the pixels of each row is completed.
In a third aspect, a display device is provided, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the pixel charging method as described above.
Optionally, the display device is a medical ultrasonic display device.
In a fourth aspect, a computer-readable storage medium is provided, which stores computer instructions that, when executed on a computer, cause the computer to perform the method of pixel charging as described above.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the pixel charging method, the pixel charging device, the display equipment and the storage medium, the first time length, the second time length, the target gray scale voltage of each pixel and the pre-charging voltage of each pixel are determined according to the current frame picture to be displayed; then, based on the first time length and the pre-charging voltage, controlling each row of pixels to pre-charge row by row, and synchronously controlling the switching devices corresponding to M adjacent rows of pixels to be in an open state when at least one row of pixels is pre-charged, wherein M is an integer greater than or equal to 1; and after the pre-charging of the pixels in each row is finished, controlling the pixels in each row to be charged line by line based on the second duration and the target gray scale voltage, so that the pixels in each row are charged to the corresponding target gray scale voltage. Through adopting twice charging, and synchronously starting the adjacent M rows of pixels of at least one row of pixels when precharging the row of pixels, simultaneously realizing precharging the M +1 rows of pixels, thus precharging more rows of pixels in the same time, effectively improving the charging speed, further achieving the technical effect of improving the liquid crystal response time, being beneficial to realizing higher refreshing frequency, reducing the screen flicker (Flikcer) and improving the picture display quality.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a pixel charging method according to an embodiment of the invention;
FIG. 2 is an exemplary charging timing diagram according to an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating an exemplary precharge process according to an embodiment of the present invention;
FIG. 4 is a timing diagram of an exemplary charging process in an embodiment of the present invention;
FIG. 5 is a waveform diagram illustrating an exemplary driving data signal according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating brightness variation of a test screen under a conventional charging mode according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating brightness variation of a test screen under a new charging mode according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a pixel charging device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
A pixel charging method according to an embodiment of the present invention is further described in detail below with reference to the drawings. Referring to fig. 1, a pixel charging method according to an embodiment of the present invention may include the following steps S101 to S103.
Step S101, aiming at a current frame picture to be displayed, determining a first time length, a second time length, a target gray scale voltage of each pixel and a pre-charging voltage of each pixel.
In a specific implementation process, each frame to be displayed may be sequentially used as a current frame, and the pixel charging method described in step S101 to step S103 is executed.
The first duration and the second duration may be predetermined according to the screen resolution and the target refresh frequency. Wherein the target refresh frequency is the refresh frequency that needs to be reached. Specifically, the target liquid crystal response time to be achieved may be determined in advance based on the target refresh frequency, and then divided into the precharge time and the charge time through multiple times of debugging. Here, the precharge time is a time consumed for completing the precharge process of the following step S102, and the charge time is a time consumed for completing the charge process of the following step S103. Then, the precharge time is divided by the number of pixel rows to obtain a first time length, and the charge time is divided by the number of pixel rows to obtain a second time length.
The target gray scale voltage is the voltage which needs to be charged when each pixel reaches the corresponding brightness when the current frame picture is displayed, and is determined based on a gamma curve adopted by the display equipment and the corresponding relation between the pre-written gray scale and the voltage. In an alternative embodiment, in order to shorten the charging time after the pixels are charged to reach the target gray-scale voltage, during the pre-charging process, each pixel may be overcharged first, that is, the pre-charging voltage of each pixel is greater than the target gray-scale voltage of the pixel, so that the liquid crystal corresponding to each pixel is quickly deflected, and the pixels can be charged to the target gray-scale voltage with a shorter charging time.
In an alternative embodiment, the first time period is less than the second time period in order to ensure that there is enough time for each pixel to finally charge to the target gray scale voltage after charging.
For example, if the requirement for use at 120Hz is satisfied, the liquid crystal response time should be less than or equal to 8.3ms, and assuming that the target liquid crystal response time is set to 8.3ms, the pre-charge time can be determined to be 2.8ms and the charge time can be set to 5.5ms by debugging and comparing the G to G (i.e., Gray to Gray) test results and the image quality a plurality of times. Further, assuming that the screen resolution is 1920 × 1080, the first duration may be determined to be 2.8ms/1080 ═ 2.6us, and the second duration may be set to be 5.5ms/1080 ═ 5.09 us.
Step S102, based on the first time length and the pre-charging voltage, controlling each row of pixels to pre-charge row by row, and synchronously controlling the switch devices corresponding to M adjacent rows of pixels to be in an open state when at least one row of pixels is pre-charged, wherein M is an integer greater than or equal to 1.
It will be appreciated that M +1 should be less than or equal to the number of pixel rows of the pixel array. The step of controlling each row of pixels to precharge row by row is to scan each pixel row in sequence from the first row, and when a gate scanning signal is provided to a gate line corresponding to the scanned pixel row to turn on a switching device corresponding to the pixel row, a corresponding precharge driving signal is input to each data line corresponding to the pixel array to precharge the pixels in the row. In the process of pre-charging scanning, in order to increase the pre-charging time of each pixel as much as possible on the basis of a certain time spent in the whole pre-charging process so as to achieve better charging saturation, when at least one row of pixels is pre-charged, the switching devices corresponding to M rows of pixels adjacent to the row of pixels can be synchronously controlled to be in an open state, and meanwhile, the pre-charging of M +1 rows of pixels is realized. This enables more rows to be precharged for the same length of time, increasing the precharge time for the synchronously turned on pixel rows for a limited period of time, causing the liquid crystal in the liquid crystal capacitors of the pixel rows to be pre-deflected. And because the difference of the target gray scale voltages of the pixels in the adjacent rows is small, the charging voltage deviation, namely the deviation of the liquid crystal deflection angle, brought to the corresponding pixels by the pre-charging can be controlled within a compensation range. Specifically, the control can be performed by adjusting the pre-charge voltage of each pixel, the first time period, and the number of pixel rows synchronously turned on in the pre-charge process.
The at least one row of pixels may be one row of pixels or a plurality of rows of pixels, and are specifically configured according to actual needs. In an alternative embodiment, for a pixel row with M rows of pixels, the switching devices corresponding to M adjacent rows of pixels can be synchronously controlled to be in the on state when the pixels in the row are precharged. Therefore, the scanning control is convenient, and the pre-charging amount of each pixel is also convenient to control, so that the pixels in the subsequent row are pre-charged according to the pre-charging voltage of the previous adjacent pixel row before the pixels in the subsequent row are pre-charged by the corresponding pre-charging voltage, and the required charging amount can be quickly reached.
In an alternative embodiment, the pre-charging process may include the steps of:
scanning each line of pixels line by line, wherein j is the current scanning line, and sequentially taking an integer from 1 to W, wherein W is the number of pixel lines;
if j is less than or equal to W-M, controlling the j row of pixels to be precharged by adopting a precharge voltage within a first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the j + M row of pixels to be in an on state;
if j is larger than W-M and smaller than W, controlling the j row of pixels to be precharged by the precharge voltage within a first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the W row of pixels to be in an on state;
if j is equal to W, controlling the W-th row of pixels to be precharged with the precharge voltage for the first time period.
It should be noted that the selection of M may be determined according to the required charging saturation and the visual image quality, i.e., the degree of picture clarity acceptable to human eyes, so as to avoid that the user feels stuck during the picture display process. When M is too small, the pre-charging effect may be poor, the final liquid crystal response time is improved less, and when M is too large, the deviation of the liquid crystal deflection angle may be difficult to compensate. The method can be specifically adjusted according to the screen resolution in the actual application scene and the liquid crystal response time to be achieved, so that the pre-charging effect and the deviation of the liquid crystal deflection angle are balanced. For example, after debugging, when the screen resolution is 1920 × 1080, M may be 8 lines, that is, 9 lines are driven simultaneously; for a 43 inch screen, M can be 5 rows, i.e. 6 rows can be driven simultaneously; and for a 16 inch screen, such as a screen with a resolution of 1440 x 900, M may be 9 rows, i.e., enabling 10 rows of simultaneous drive, or may be 11 rows, i.e., enabling 12 rows of simultaneous drive. Of course, in addition to the listed values of M, other integers greater than 1 may be selected according to the needs of practical application, and are not limited herein.
In an alternative embodiment, the precharge voltage of each pixel may be determined by:
processing the target gray scale voltage of each pixel, and determining the pre-charging reference voltage of each pixel; and adding a preset amplification voltage to the pre-charging reference voltage to obtain the pre-charging voltage of each pixel. The amplification voltage is larger than zero and smaller than or equal to the difference between the upper limit driving voltage and the corresponding pre-charging reference voltage. The upper limit driving voltage is AVDD, which is the maximum driving voltage value of the driving chip. The specific value of the amplification voltage can be determined by multiple times of debugging in practical application. For example, in one application scenario, the amplified voltage may take the common voltage V com1/2 times higher.
In consideration of the fact that the luminance in the display screen is usually transited by pixel blocks, the luminance difference between adjacent pixels is small within a certain area in the column direction, that is, the difference between target gray-scale voltages is small. For each pixel, the average value of the target gray scale voltages of the pixels in the adjacent rows can be taken as the pre-charge reference voltage of the pixel. The selection of the adjacent row of pixels can be determined according to a specific adopted pre-charge driving mode.
In an alternative embodiment, an M +1 row precharge driving manner may be adopted, that is, for all the subsequent pixel rows in which at least M rows of pixels exist, while precharging the pixels in the row, the switching devices of the subsequent adjacent M rows of pixels are synchronously controlled to be turned on. This allows the M rows of pixels to be precharged in advance during the precharge of the row of pixels, while also using the precharge voltage of the row of pixels. At this time, for convenience of control, the time length of single turn-on of the switching device corresponding to each row of pixels may be M +1 times of the first time length, and the next row of pixels is turned on every other first time length with the turn-on time point of the first row of pixels being the starting time point, where the rows 1 to M may be turned on in advance before the arrival of the driving signal.
In an alternative embodiment, the processing the target gray scale voltage of each pixel and determining the pre-charge reference voltage of each pixel may include: dividing the pixel array into a plurality of pixel units by taking adjacent M +1 rows of pixels as a dividing reference; and taking the average value of the target gray-scale voltage as the pre-charging reference voltage of the pixels of the corresponding row according to the row aiming at each pixel unit. Of course, in other embodiments, other calculation methods than the average value may be used, for example, a maximum value or a median value may be used.
For simplifying the control, when M +1 is a divisor of the row number W, i.e., M +1 can be divided by W, the division method may be: the pixel array is equally divided into W/(M +1) pixel units, that is, every M +1 row of adjacent pixels can be sequentially divided into one pixel unit from the first row of pixels, so as to obtain W/(M +1) groups of precharge reference voltages. Further, on the basis of each group of pre-charging reference voltages, a preset amplification voltage Δ V is added to obtain a pre-charging voltage of each pixel. Alternatively, when M +1 is not a divisor of the number W of rows, the division may be performed first according to every M +1 rows of adjacent pixels, and then the last remaining less than M +1 rows of adjacent pixels may be divided into one pixel unit.
For example, if the screen resolution is 1920 × 1080, taking a 9-row precharge driving method as an example, the precharge voltages of the pixels in the rows 1 to 9 are all: taking the average value of the target gray scale voltages of the pixels of 1 to 9 rows and adding delta V; the precharge voltages of the pixels in the rows 10 to 18 are all as follows: taking the average value of the target gray scale voltages of the pixels of 10 to 18 rows and adding delta V; by analogy, the precharge voltages of the pixels in rows 1072 to 1080 are all: the target gray scale voltages of 1072 to 1080 rows of pixels are averaged by row plus Δ V.
Of course, in other embodiments, other precharge voltage calculation methods may be employed. For example, the target gray scale voltages of the currently precharged pixel row and the other synchronously turned on pixel rows may be averaged by column plus Δ V to serve as the precharge voltage for the pixels in the row, and if the k +1 th to k +8 th rows are synchronously turned on during the precharge of the k-th row, the target gray scale voltages of the pixels in the k-k +8 rows may be averaged by column plus Δ V to serve as the precharge voltage for the k-th row. At this time, M +1 may take an integer value greater than or equal to 2 and less than or equal to the number W of pixel lines.
And step S103, after the pre-charging of the pixels in each row is completed, controlling the pixels in each row to be charged row by row based on the second time length and the target gray scale voltage.
The step of controlling each row of pixels to charge line by line is to scan each pixel row in sequence from the first row, and when a grid scanning signal is provided to a grid line corresponding to the scanned pixel row to turn on a switching device corresponding to the pixel row, a corresponding charging driving signal is input to each data line corresponding to the pixel array to charge the pixel row according to a target gray scale voltage, so that each pixel is charged to the target gray scale voltage, and the display of a current frame picture is realized.
In an optional implementation manner, in the process of controlling each row of pixels to be charged row by row, when at least one row of pixels is charged, the switching devices corresponding to the subsequent adjacent N rows of pixels may be synchronously controlled to be in the on state. Wherein N is an integer greater than or equal to 1, and N is less than M. The at least one row of pixels may be a row of pixels or a plurality of rows of pixels, and are specifically set according to actual needs. In an optional implementation manner, for all the pixel rows with N rows of pixels in succession, when the pixel row is charged according to the target grayscale voltage, the switching devices corresponding to the pixels in the successive adjacent N rows of the pixel row are synchronously controlled to be in the on state, and the charging of the pixels in the successive adjacent N rows is synchronously realized. That is, in the second stage of charging, for the pixel rows except the first row, before charging according to the target gray scale voltage, the pixel rows may be pre-charged sequentially with the target gray scale voltages of the adjacent pixels in the previous N rows, so that the charging time of each pixel is increased on the basis of a certain overall charging time in the second stage, and the difference between the target gray scale voltages of the adjacent pixel rows is small, and the pre-charging can pre-charge the pixel charge amount to gradually approach the target gray scale voltage, which is beneficial to reducing the time for each pixel to be charged to the target gray scale voltage, i.e., increasing the charging speed.
At this time, for convenience of control, the time length of single turn-on of the switching device corresponding to each row of pixels may be N +1 times of the second time length, and the next row of pixels is turned on every second time length with the turn-on time point of the first row of pixels being the starting time point, where the rows 1 to N may be turned on in advance before the arrival of the driving signal.
It should be noted that the value of N may be set according to actual needs, and if the value of N is too small, the number of pixel rows covered by the synchronous precharge is small, and the charging time that can be reduced is small, and if the value of N is too large, the difference between the precharge voltage and the target gray scale voltage may be large, which is not favorable for making the pixel charging amount gradually approach the target gray scale voltage. For example, N may be an integer greater than or equal to 1 and less than or equal to 3.
In order to balance the charging time and the voltage difference well, in an optional embodiment, N may be 2, that is, a 2+1 row charging driving manner is adopted, that is, for all the subsequent pixel rows having at least 2 rows of pixels, when the target gray scale voltage is used to charge the pixels in the row, the switching devices of the subsequent adjacent 2 rows of pixels are synchronously controlled to be turned on. Therefore, the pixels in the last two rows can be pre-charged in advance, and the charging time of the pixels in the two rows is increased, so that the pixels can be charged to the target gray scale voltage in a specific enough time.
In an alternative embodiment, the charging process of step S103 may include the following steps:
scanning each line of pixels line by line, wherein i is a current scanning line, and sequentially taking an integer from 1 to W, and W is the number of pixel lines;
if i is less than or equal to W-N, controlling the pixels of the ith row to be charged by adopting the target gray scale voltage within a second time period, and synchronously controlling the switching devices corresponding to the pixels of the (i +1) th row to the pixels of the (i + N) th row to be in an opening state;
if i is larger than W-N and smaller than W, controlling the pixels in the ith row to be charged by adopting the target gray scale voltage in a second time period, and synchronously controlling the switching devices corresponding to the pixels in the (i +1) th row to the pixels in the W th row to be in an on state;
and if i is equal to W, controlling the W-th row of pixels to be charged by adopting the target gray scale voltage in a second time length.
In order to more clearly describe the two-stage scanning process described in step S102 to step S103, the two-stage scanning process will be described below by taking the charging sequence shown in fig. 2 as an example.
As shown in fig. 2, the Gate1, Gate2, Gate3, …, Gate9 and … are driving signal waveforms of the Gate lines corresponding to the first row of pixels, the second row of pixels, the third row of pixels, …, the ninth row of pixels and …, respectively, and Data is a waveform diagram of a driving signal applied to a Data line, where a precharge voltage of the first row of pixels is represented as D1 ', a precharge voltage of the second row of pixels is represented as D2 ', a precharge voltage of the third row of pixels is represented as D3 ', a precharge voltage of the fourth row of pixels is represented as D4 ', a precharge voltage of the fifth row of pixels is represented as D5 ', and so on. The target gray scale voltage of the first row of pixels is denoted as D1, the target gray scale voltage of the second row of pixels is denoted as D2, the target gray scale voltage of the third row of pixels is denoted as D3, and so on.
For the picture of the Nth frame (N frame), in the precharging process of the first stage, when the Gate1 is at a high level and the pixels of the first row are precharged by adopting D1', synchronously controlling the gates 2-9 to be at a high level, so that the pixels of the 1 st to 9 th rows are precharged synchronously; similarly, when the Gate2 is at high level and the pixels in the second row are precharged by using the D2', the gates 3-10 are synchronously controlled to be at high level, so that the pixels in the 3 rd to 10 th rows are also precharged synchronously; and the like until the pre-charging of all the pixels is completed.
After the pre-charging of all the row pixels is completed, starting the charging process of the second stage, and synchronously controlling the gates 2-3 to be at a high level when the Gate1 is at a high level and the D1 is adopted to charge the first row pixels, so that the 2 nd-3 rd row pixels are also pre-charged synchronously; when the D2 is adopted to charge the pixels in the second row, the gates 3-4 are synchronously controlled to be at a high level, so that the pixels in the 3 rd row and the 4 th row are synchronously precharged; and the like until the charging of all the pixels is completed. Further, the similar charging process is continuously performed for the (N +1) th frame (N +1frame) picture.
In practical application, the pixel charging method provided by the embodiment of the invention can be applied to a display device with higher requirement on liquid crystal response time. The following description will take an example of the application of the pixel charging method provided by the embodiment of the present invention to a 23.8-inch stacked-screen (BD Cell) display device.
Note that the 23.8BD Cell product used a 3.2gamma curve. The inventor finds that compared with the traditional single-screen 2.2gamma curve, the 3.2gamma curve has the advantages that the brightness rise is too gentle in the low-gray stage and too gentle, and the high specification requirement of the gray scale Flicker (Flicker) value is difficult to meet. For example, when the BD Cell product is applied to medical detection such as ultrasonic detection, the 10% gray scale, 20% gray scale, 30% gray scale, 40% gray scale, 50% gray scale, 60% gray scale, 80% gray scale and 90% gray scale are used as characteristic gray scales, and the Flicker value under 40% to 90% gray scale is required to be less than 1%, wherein the 40% gray scale brightness is that the Flicker value under 102 gray scale cannot meet the specification requirement of 1%. Since the 40% gray scale transmittance under the 3.2gamma curve is much lower than the 40% gray scale transmittance under the 2.2gamma curve, the 40% gray scale luminance under the 3.2gamma curve is much lower than the 40% gray scale luminance under the 2.2gamma curve under the condition of constant luminance.
After the luminance signal of the test screen is collected by the luminance test equipment such as CA310, the luminance signal is converted into a voltage signal, and then the voltage signal is analyzed by the signal processing circuit in an AC part and a DC part in one period. Further, the Flicker value is finally obtained by calculating the formula Flicker (AC/DC) × 100%. It is understood that the AC portion of the voltage signal during a cycle is defined as Vmax-Vmin, and the DC portion is defined as (Vmax + Vmin)/2. Therefore, the magnitude of the screen Flikcer value depends on the overall specific gravity of the AC part, and in the case where the DC part is constant, Flikcer becomes larger as the specific gravity of the AC part is larger, and Flicker becomes lower as the DC part is larger as the DC part is constant.
It is understood that the DC value is mainly determined by the MDL (Module) brightness of the lcd, and the AC value is mainly determined by the liquid crystal charging jitter, the liquid crystal deflection response, and the pixel voltage holding. The brightness of the same type of liquid crystal module BLU (Back Light Unit) is determined, the transmittance under the 3.2gamma curve is lower than the transmittance under the 2.2gamma curve, for example, 40% gray scale is the brightness under the gamma 3.2 curve lower than the gamma 2.2 curve at 102 gray scale, i.e., the DC value under the 3.2gamma curve is lower than the DC value under the 2.2gamma curve. Also, the same panel liquid crystal charging jitter, liquid crystal deflection response, and pixel voltage remain substantially the same, i.e., the AC parts are substantially the same. Since Flicker is 100% (AC/DC), the larger the DC value, the lower the Flicker value in the case where the AC part is substantially uniform. Therefore, the single-screen 2.2gamma product can meet the specification that flicker is less than 1% under the 40% gray scale, and the BD Cell gamma curve is changed to 3.2 and cannot meet the specification that flicker is less than 1%.
Based on the analysis, under the condition that the brightness (namely the DC value) of the product backlight module is constant, the reduction of the flicker value of the gray scale can be realized by reducing the AC value, so that the flicker value of the gray scale of the product meets the specification. In view of this, the pixel charging method provided by the embodiment of the present invention is applied to the 23.8BD Cell product, so as to improve the liquid crystal response time, and enable the product to operate at a higher screen refresh frequency, for example, the screen refresh frequency can reach 120 Hz.
In a specific test, the screen resolution is 1920 × 1080 as an example, wherein the screen refresh frequency is 120Hz, and the inversion mode is column inversion. After the inventor debugs for a long time, the set precharge time can be set to 5.5ms for 2.8ms of charging time, i.e., 8.3ms for the entire time. In the first stage of pre-charging, a 9-row pre-charging driving method is adopted, and pixels in 1080 rows are pre-charged row by row within 2.8 ms. The width of single turn-on of the switching device corresponding to each row of pixels is 9 data widths, which is 9 times of the first time length, in the pre-charging process, from the 9 th row of pixels, the time T2 for pre-charging the pixels in each row by using the pre-charging voltage corresponding to the pixels in the row is 2.6us, the time T1 for pre-charging the pixels in the previous adjacent row by using the pre-charging voltage corresponding to the pixels in the previous row is 20.7us, and the timing relationship of the pre-charging process is shown in fig. 3. In FIG. 3, data1 ', data 2', data3 ', …, data 9', … correspond to precharge voltages indicating line 1, line 2, line 3, line …, and line 9 …, respectively.
The charging process adopts a 3-line charging driving method, and 1080 lines of pixels are charged line by line within 5.5 ms. The Gate is turned on for 3 data widths, from the pixel in row 3, the time T4 for charging the pixel in each row with the target gray scale voltage corresponding to the pixel in the row is 5.09us, the time T3 for charging the pixel in the previous adjacent row with the target gray scale voltage is 10.1us, and the timing relationship of the charging process is shown in fig. 4. In FIG. 4, data1, data2, data3, and … respectively correspond to the target gray-scale voltages for row 1, row 2, and row 3 ….
In the charging process, the driving Data signal Data of the test screen is tested in the image display process, and the test result is shown in fig. 5. The test results for the nth frame image and the N +1 th frame image are shown in fig. 5. According to the test result, compared with the conventional charging mode that the whole pixel array is charged once, namely one frame of display is completed, for the Nth frame of image, the total charging time can be greatly shortened by performing the two scanning processes, namely the pre-charging process and the charging process, so that the liquid crystal can meet the response time of 120 Hz.
Further, after the completion of the charging, the test screen was also subjected to a G to G test using a device for evaluating the response time of the liquid crystal, such as MPRG 2000. As can be seen from the test data (see table 1), compared with the conventional charging method, the pixel charging method (i.e., the new charging method) provided by the embodiment of the present invention performs charging, so that the response time of the liquid crystal is greatly increased, the G to G time is shortened by nearly 1 time, and the response can meet the requirement of using at a refresh frequency of 120 Hz.
TABLE 1
| Parameter(s) | Traditional charging mode | Novel charging mode |
| G to G(ms) | 13.75 | 7.97 |
| Tr(ms) | 8.79 | 4.26 |
| Tf(ms) | 4.96 | 3.71 |
Further, fig. 6 shows a luminance variation diagram of the test screen in the above-described conventional charging manner; fig. 7 is a graph showing the luminance change of the test screen in the new charging mode. Comparing fig. 6 and 7, it can be known that compared with the conventional charging method, the new charging method can significantly reduce the Vmax-Vmin value, i.e. can reduce the AC value, thereby achieving the reduction of the gray level flicker value. Compared with the traditional charging mode, the novel charging mode can shorten the liquid crystal retention and pixel leakage time by 1 time and reduce the leakage current by 2 times under the same liquid crystal and TFT process, so that the flicker value under 40% gray scale reaches 0.6%, and the specification requirement of less than 1% is met.
According to the pixel charging method provided by the embodiment of the invention, through the two-stage charging scanning, and in the first-stage pre-charging process, when at least one row of pixels is pre-charged, the adjacent M rows of pixels are synchronously started, so that more rows of pixels can be pre-charged in the same time, the charging speed is effectively increased, the technical effect of improving the liquid crystal response time is achieved, the higher refreshing frequency is favorably realized, the screen flicker (Flikcer) is reduced, and the picture display quality is improved.
Based on the same inventive concept, an embodiment of the present invention further provides a pixel charging device, as shown in fig. 8, where the pixel charging device 80 includes:
a determining module 801, configured to determine, for a current frame picture to be displayed, a first duration, a second duration, a target grayscale voltage of each pixel, and a precharge voltage of each pixel;
a first control module 802, configured to control each row of pixels to perform pre-charging on a row-by-row basis based on the first time length and the pre-charging voltage, and synchronously control a switching device corresponding to M adjacent rows of pixels to be in an on state when at least one row of pixels is pre-charged, where M is an integer greater than or equal to 1;
a second control module 803, configured to control, on the basis of the second duration and the target grayscale voltage, the pixels in each row to be charged row by row after the precharge of the pixels in each row is completed.
In an alternative embodiment, the pre-charge voltage is greater than the target gray scale voltage, and the first time period is less than the second time period.
In an optional implementation, the second control module 803 is further configured to: and when at least one row of pixels is charged, synchronously controlling the switching devices corresponding to the pixels of the subsequent adjacent N rows to be in an on state, wherein N is an integer greater than or equal to 1, and N is less than M.
In an optional implementation manner, the second control module 803 is specifically configured to:
if i is less than or equal to W-N, controlling the pixels of the ith row to be charged by adopting the target gray scale voltage in the second time period, and synchronously controlling the switching devices corresponding to the pixels of the (i +1) th row to the pixels of the (i + N) th row to be in an opening state, wherein i is an integer from 1 to W, and W is the number of pixel rows;
if i is larger than W-N and smaller than W, controlling the pixels in the ith row to be charged by adopting the target gray scale voltage in the second time period, and synchronously controlling the switching devices corresponding to the pixels in the (i +1) th row to the pixels in the W th row to be in an on state;
and if i is equal to W, controlling the W-th row of pixels to be charged by adopting the target gray scale voltage in the second time length.
In an alternative embodiment, N is greater than or equal to 1 and less than or equal to 3.
In an optional implementation manner, the first control module 802 is specifically configured to:
if j is less than or equal to W-M, controlling the j row of pixels to be precharged by adopting the precharge voltage in the first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the j + M row of pixels to be in an open state, wherein j is an integer from 1 to W, and W is the row number of the pixels;
if j is larger than W-M and smaller than W, controlling the j row of pixels to be precharged by the precharge voltage in the first time period, and synchronously controlling the switching devices corresponding to the j +1 row of pixels to the W row of pixels to be in an on state;
and if j is equal to W, controlling the W-th row of pixels to be precharged with the precharge voltage for the first time period.
In an alternative embodiment, the determining module 801 is configured to:
processing the target gray scale voltage of each pixel, and determining the pre-charging reference voltage of each pixel;
and adding a preset amplification voltage to the pre-charging reference voltage to obtain the pre-charging voltage of each pixel, wherein the amplification voltage is greater than zero and less than or equal to the difference between the upper limit driving voltage and the pre-charging reference voltage, and the upper limit driving voltage is the maximum driving voltage value of the driving chip.
In an alternative embodiment, the determining module 801 is configured to: dividing the pixel array into a plurality of pixel units by taking adjacent M +1 rows of pixels as a dividing reference; and taking the average value of the target gray-scale voltage as the pre-charging reference voltage of the pixels of the corresponding row according to the row aiming at each pixel unit.
In an alternative embodiment, M is 5, 8, 9 or 11.
The modules may be implemented by software codes, or may be implemented by hardware, for example, an integrated circuit chip.
It should be further noted that, for the specific process of implementing the respective function by each module, please refer to the specific content described in the foregoing method embodiments, which is not described herein again.
Based on the same inventive concept, as shown in fig. 9, an embodiment of the present invention further provides a display device 90, which includes a processor 902, a memory 901, and a computer program stored on the memory 901 and operable on the processor 902. When being executed by a processor, the computer program realizes the processes of the pixel charging method embodiment, can achieve the same technical effect, and is not repeated here to avoid repetition. For example, the display device may be a medical ultrasonic display device, or may also be other display devices that have a high requirement on the response time of liquid crystal, such as a display device for a computer race.
Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer instruction, and when the computer instruction runs on a computer, the computer executes each process of the pixel charging method embodiment, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here. For example, the computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The term "plurality" means more than two, including two or more.
While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all changes and modifications that fall within the scope of the specification.
Claims (13)
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