CN101325021B - Method for Detecting Burn-in Phenomenon of Display - Google Patents

Abstract

The invention discloses a method for detecting the burning-on phenomenon of a display, which firstly provides a display with N-level gray scale tones. Then, a burning attaching test picture is displayed on the display, wherein the burning attaching test picture is formed by matching at least one first pattern and at least one second pattern, the first pattern has low-order gray scale tones, and the second pattern has high-order gray scale tones. After displaying the burning test picture for a period of time, a burning area and an unfired area are formed in the display, wherein the burning area is where one of the first pattern and the second pattern is located, and the unfired area is where the other of the first pattern and the second pattern is located. The display is switched to a detection picture, wherein the gray scale tone of the detection picture corresponding to the non-burning region is the Mth level of standard tone. Then, a plurality of intermediate tones are displayed in the detection frame corresponding to the burning region one by one, wherein the intermediate tones are from the Mth order to the M +1 th order or from the Mth order to the M-1 th order. When the boundary between the burning region and the non-burning region in the detection picture is the slightest, the middle tone is converted into a burning grade.

Description

Method for Detecting Burn-in Phenomenon of Display

technical field

The invention relates to a method for detecting the burn-in phenomenon of a display, and in particular to a method for accurately judging the burn-in degree of the display.

Background technique

Burn-in phenomenon means that the image or outline of the previous static picture appears in the subsequent picture. That is, when the monitor displays a static picture for a long time, the image or outline of the previous static picture will appear on the next picture when it is displayed. Generally speaking, the reason why the human eye can detect the burn-in phenomenon is that the brightness or chromaticity difference between the burn-in area and the non-burn-in area is too large.

At present, a set of unified norms and judgment standards has not been formulated for the grade of burning phenomenon. The main reason is that the judgment method proposed at present is not an appropriate method or cannot be realized. The methods that have been proposed so far are as follows:

The method proposed in US 2003/0214586 is to use a charge coupled device (CCD) to measure the burn-in level. However, since the CCD cannot accurately simulate the visual perception of the human eye and effectively quantify the perception, it has been delayed in practical application.

The method proposed in US 6,791,520 is to use the comparison of brightness difference to determine the degree of burning. However, this method is easily disturbed by color differences, and the discovery of burn-in phenomenon will be related to the distinctness of the boundaries of different burn-in blocks, rather than the difference in brightness alone. Therefore, this method is even less applicable than the above-mentioned CCD measurement method.

The method proposed in US 2002/0097395 is to change the gray scale by using the voltage change to determine the burning level. This method can only be applied to LCD monitors. In addition, this method cannot be practically applied to the product, and the resistor must be replaced on the test panel in order to subdivide the original gamma resistance curve into finer voltages. Therefore, this kind method cannot be conducive to the production of product.

The method proposed in US 6,590,411 is to use the change of capacitance to determine the level of burning. This method can only be applied to liquid crystal displays. In addition, because there are many parasitic electricity in the panel structure, it is easy to interfere with the measured value. Therefore, this method can only be used for a test panel with a simple structure, and cannot directly link the test result with the product.

Contents of the invention

The invention provides a method for detecting the burn-in phenomenon of a display, which can determine the burn-in level of the display more accurately, and the method can be applied to various displays.

The present invention also provides a method for detecting the burn-in phenomenon of the display, which can automatically and accurately determine the burn-in level of the display.

The invention proposes a method for detecting the burn-in phenomenon of a display. The method firstly provides a display with N-level gray scales. Then, display a burn-in test picture on the display, wherein the burn-in test picture is composed of at least one first pattern and at least one second pattern, and the first pattern has a low-level grayscale tone, and the second Patterns have high-level grayscale tones. After displaying the burning test picture for a period of time, a burning area and a non-burning area will be formed in the display, wherein the burning area is where one of the first pattern and the second pattern is located, and the non-burning area is Another location of the first pattern and the second pattern. Switch the display to a detection screen, wherein the gray scale of the detection screen corresponding to the unbonded area is the Mth level of a standard tone. Then, a plurality of intermediate tones are displayed one by one on the detection screen corresponding to the burning area, wherein the intermediate tones are between the Mth order to the M+1th order or the Mth order to the M−1th order. When the boundary between the burn-in area and the non-burn-in area in the detection screen almost disappears, the middle tone is transformed into a burn-in level.

In an embodiment of the present invention, the images of these intermediate tones between the Mth order to the M+1st order or the Mth order to the M-1st order are displayed on the detection screen corresponding to the burning area. The method includes: making a part of the pixels display the gray scale tone of the Mth level and making another part of the pixels display the gray scale tone of the M+1st level or the M-1th level; and by displaying the Mth level The number of pixels of the gray scale tone of the gray scale tone is matched with the number of pixels displaying the gray scale tone of the M+1th level or the M−1st level, so as to form the above-mentioned multiple intermediate tones.

In an embodiment of the present invention, the images of these intermediate tones between the Mth order to the M+1st order or the Mth order to the M-1st order are displayed on the detection screen corresponding to the burning area. The method includes: alternately displaying the Mth level and the M+1st or M-1th level grayscale tone, wherein the time for displaying the Mth level is the first time, and displaying the M+1th level or M-1th level The first time is the second time; and the combination of the first time and the second time length or frequency is used to form the above-mentioned multiple intermediate tones.

In an embodiment of the present invention, the first pattern and the second pattern in the above-mentioned burning test frame are arranged in a checkerboard pattern.

In an embodiment of the present invention, the first pattern in the above-mentioned burn-in test frame is located in the center of the burn-in test frame, and the second pattern surrounds the first pattern.

In an embodiment of the present invention, the second pattern in the above-mentioned burn-in test frame is located at the center of the burn-in test frame, and the first pattern surrounds the second pattern.

In an embodiment of the present invention, the display is a liquid crystal display or a plasma display panel.

In an embodiment of the present invention, the gray scale of the first pattern is the first level, and the gray scale of the second pattern is the Nth level.

In one embodiment of the present invention, when judging whether the boundary between the burnt area and the unburned area is almost disappeared, it also includes providing an optical measuring instrument, and measuring the display in the burnt area and the unburned area by the optical measuring instrument. The displayed images are used to obtain a first value and a second value respectively. When the first value and the second value are substantially the same, the boundaries of the images presented by the burnt area and the non-burned area almost disappear.

In an embodiment of the present invention, the optical measuring instrument includes a luminance meter, a colorimeter or a spectrometer.

The present invention provides a method for detecting the burn-in phenomenon of a display, which includes: firstly, providing a display with a plurality of pixels. Then, a burn-in test picture is displayed on the monitor. Wherein, the burn-in test picture is composed of at least one first pattern and at least one second pattern, and the grayscale of the first pattern is different from the grayscale of the second pattern. Then, after the burn-in test image is displayed for a period of time, a burn-in area and a non-burn-in area will be formed on the display. Afterwards, the display is switched to a detection screen, and the gray scale of the detection screen corresponding to the unbonded area is an integer. Then, at least one intermediate tone is input in the detection screen corresponding to the burning area, and the gray scale of the intermediate tone is between two consecutive integers. Then, an image capture device captures the images respectively presented in the burned area and the unburned area to obtain an image data, wherein the image data at least includes the chromaticity presented by each pixel in the burned area and the unburned area with brightness. Afterwards, an image processing program is performed on the image data to obtain an evaluation value, wherein the image processing program includes comparing the difference in chromaticity or brightness of adjacent pixels to calculate a plurality of change values corresponding to each pixel; and providing A perceivable value, and detecting pixels whose change value is greater than the perceivable value is converted into an evaluation value. Next, the evaluation value is converted into a burnt grade.

In an embodiment of the present invention, the above-mentioned step of converting into an evaluation value includes: calculating a sum of products of the number of pixels larger than a perceivable value and their corresponding change values.

In an embodiment of the present invention, in the above-mentioned method for detecting burn-in of the display, in the step of inputting at least one intermediate tone corresponding to the burn-in area in the detection screen, multiple intermediate tones are input to the burn-in area.

In an embodiment of the present invention, the image capture device captures the images presented by the burned area and the unburned area one by one when each type of intermediate tone is input.

In an embodiment of the present invention, the respective images of the burnt area and the unsintered area include an image in which the boundary between the burnt area and the unsintered area almost disappears.

In an embodiment of the present invention, the image capture device includes a charge coupled device (CCD).

Since the present invention can be subdivided into a plurality of intermediate tones between the M and M+1 levels, it is possible to compare tiny differences in brightness and chromaticity, and then accurately determine the burning level.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are exemplified below and described in detail with accompanying drawings.

Description of drawings

FIG. 1 to FIG. 3 are schematic diagrams of burn-in test screens according to an embodiment of the present invention.

4A to 4D are schematic diagrams of detection screens according to an embodiment of the present invention.

FIG. 5A is a schematic diagram of a method for editing midtones according to an embodiment of the present invention. FIG. 5B is an intermediate tone with a tone of 120.5 presented in the editing mode of FIG. 5A .

FIG. 6A is a schematic diagram of a method for editing mid-tones according to an embodiment of the present invention. FIG. 6B is an intermediate tone with a tone of 120.25 presented in the editing mode of FIG. 6A .

FIG. 7A is a schematic diagram of a method for editing mid-tones according to an embodiment of the present invention. FIG. 7B is a middle tone with a tone of 120.75 presented in the editing mode of FIG. 7A.

FIG. 8 is a schematic diagram of a burnt area and an unburned area of a display according to a third embodiment of the present invention.

9A-9B are schematic diagrams of a detection block diagram according to a third embodiment of the present invention.

Detailed ways

When the difference in brightness between the burn-in area and the non-burn-in area of the display exceeds one step in the output gray scale, the burn-in phenomenon can be clearly seen by the human eye. Therefore, determining the burn-in level of a display is one of the important indicators for whether a display product can be shipped. In addition, for liquid crystal displays, the degree of burn-in phenomenon is related to liquid crystal materials, compatibility between liquid crystals and related materials, process conditions, process cleanliness, and so on. As for the plasma display panel, the degree of burning phenomenon is related to the driving mode, the materials of the protective layer and the fluorescent layer, the operating temperature and so on. Therefore, if the burn-in level of the display can be accurately determined, when a new process condition is added, the extent to which the process condition causes the burn-in level to change can be accurately judged.

The method for detecting the burn-in phenomenon of the display provided by the present invention can accurately determine the difference of burn-in levels, and the method can be applied to various displays. The following examples are used to describe the present invention in detail so that those skilled in the art can implement it, but are not intended to limit the scope of the present invention.

First, a display is provided, which has N-level gray scales. In one embodiment, the display is a liquid crystal display. In another embodiment, the display is a plasma display panel.

Next, display a sticking test picture on the display, as shown in Figure 1, the sticking test picture is composed of at least one first pattern 10a and at least one second pattern 10b, and the first pattern 10a has a low-level gray The second pattern 10b has a high-level gray-scale tone. In a preferred embodiment, the gray scale of the first pattern 10 a is, for example, the first level, and the gray scale of the second pattern 10 b is, for example, the Nth level. In addition, the configuration of the first pattern 10a and the second pattern 10b in the burn-in test frame can be configured in various ways. For example, in one embodiment, the first pattern 10 a and the second pattern 10 b in the burn-in test frame are arranged in a checkerboard pattern (as shown in FIG. 1 ). In another embodiment, the first pattern 10a in the burn-in test frame is located in the center of the burn-in test frame, and the second pattern 10b surrounds the first pattern (as shown in FIG. 2 ). In another embodiment, the second pattern 10b in the burn-in test frame is located in the center of the burn-in test frame, and the first pattern 10a surrounds the second pattern 10b (as shown in FIG. 3 ). In this embodiment, it is described in a checkerboard distribution form as shown in FIG. 1 .

For example, for a liquid crystal display with a normally white screen (Normally White) when it is not driven, after a period of time when the burn-in test picture is displayed, a burn-in area (such as the area corresponding to the first pattern 10a) will be formed on the display and An unburned area (for example, the area where the corresponding second pattern 10b is located); on the contrary, for a liquid crystal display with a black screen (Normally Black) when not driven, after a period of time when the burn-in test picture is displayed, it will appear on the display An unburned area (for example, the area corresponding to the first pattern 10 a ) and a burnt area (for example, the area corresponding to the second pattern 10 b ) are formed thereon. The following narration will be based on the liquid crystal display that is a white screen (Normally White) when it is not driven, and then switch the display to a detection screen, as shown in Figure 4A, wherein the block 20b in the detection screen 400 is the corresponding unburned In the region, the gray scale is adjusted to the Mth step of the standard gray scale. In this embodiment, the gray scale of the block 20b (unburned area) is the Mth level (for example, the 120th level). In addition, the block 20a corresponds to the burning area, and various intermediate tones are displayed in the block 20a for comparison with the block 20b. In particular, the mid-tones displayed in block 20a are between Mth to M+1th.

It is worth mentioning that the standard grayscale (Mth level) displayed in the block 20b (in the unburned area) is a grayscale tone near the middle value of the N-level tone of the display, for example, the Mth level That is, it is equal to the N/2th order, or the (N/2)+1st order, or the (N/2)-1st order, and so on. In addition, the setting of the middle tone is changeable. For example, for a liquid crystal display with a normally black screen (Normally Black) when it is not driven, what is displayed in the block 20a corresponding to the unburned area is standard gray Step (Mth step), the intermediate tone displayed in the block 20b corresponding to the burning area is between the Mth step to the M−1th step. That is to say, the setting of the middle tone will be adjusted according to the characteristics of the display product and the perception of human eyes. In addition, the present invention further converts the gray level (Mth level) into the corresponding Burning Level Rank X. For example, the Mth rank (120th rank) corresponds to Rank 1, and the M+1st rank (121st) corresponds to Rank 2.

In addition, the various intermediate tones displayed one by one in the block 20a (burning area) of the present invention are between the Mth order to the M+1th order. In another embodiment, for a liquid crystal display with a normally black screen (Normally Black) when it is not driven, the various intermediate tones displayed one by one in the block 20b (burning area) are between the M-1st level to the Mth between steps. In this embodiment, a plurality of intermediate tones are generated between the Mth step and the M+1th step for illustration, for example, 120.25, 120.5, and 120.75 are generated between the 120th step and the 121st step. The above-mentioned gray scale tones (120, 120.25, 120.5, 120.75, 121) respectively correspond to the burning levels of Rank 1, Rank 1.25, Rank 1.5, Rank 1.75, and Rank 2. Those skilled in the art should be able to deduce the method of generating multiple intermediate tones between the M-1th order and the Mth order from the description herein, so the details will not be repeated here.

In this embodiment, the method of displaying the middle tone between the Mth order and the M+1th order in the block 20a (burning area) can be achieved by using the following editing methods:

Please refer to FIG. 5A, there are multiple pixels in the block 20a (burning area), wherein the A pixel displays the M+1th gray scale tone (for example, gray scale 121), and the B pixel displays the Mth gray scale Tone (eg gray scale 120). In FIG. 5A , A pixels account for 50% and B pixels account for 50%, so the block 20a displayed in this edit mode has a grayscale tone of 120.5, as shown in FIG. 5B .

In addition, please refer to FIG. 6A , in FIG. 6A , the A pixel displays the M+1th gray scale tone (eg gray scale 121), and the B pixel displays the Mth gray scale tone (eg gray scale 120). In FIG. 6A , A pixels account for 25% and B pixels account for 75%, so the block 20a displayed in this edit mode has a grayscale tone of 120.25, as shown in FIG. 6B .

In addition, please refer to FIG. 7A , in FIG. 7A , the A pixel displays the M+1th grayscale (eg, grayscale 121), and the B pixel displays the Mth grayscale (eg, grayscale 120). In FIG. 7A , A pixels account for 75% and B pixels account for 25%, so the block 20a displayed in this editing manner has a grayscale tone of 120.75, as shown in FIG. 7B .

In other words, through the combination of the number of pixels displaying the grayscale tone of the Mth level and the number of pixels displaying the grayscale tone of the M+1th level in the block 20a, different intermediate tones can be formed, and this The difference between the maximum and minimum gray scale values of individual pixels in the block 20a is 1 level. Of course, the above method is illustrated by subdividing the steps between 120 and 121 into three intermediate tones. But in fact, the present invention is not limited thereto, and the present invention can subdivide between 120 and 121 steps into more intermediate tones according to the requirements of the product.

The above-mentioned method for generating a plurality of intermediate tones between the Mth order and the M+1th order is achieved by means of spatial editing. However, the present invention can also subdivide a plurality of intermediate tones between the M-th order and the M+1-th order by means of time editing, as described below.

Firstly, after displaying the grayscale tone of the Mth level (for example, the 120th level) in the block 20a for a period of time, the grayscale tone of the M+1th level (for example, the 121st level) is displayed in the block 20a. An intermediate tone is formed by alternately displaying the Mth order (for example, the 120th order) and the M+1th order (for example, the 121st order). If the Mth stage (e.g., 120th) is displayed 50% of the time, and the M+1th (e.g., 121st) is displayed 50% of the time, then the Mth and M+1st are displayed alternately The tone value of the formed middle tone is 120.5.

Similarly, if the Mth order (eg, 120th) is displayed 25% of the time and the M+1th (eg, 121st) is displayed 75% of the time, then the Mth and Mth The tone value of the middle tone formed by +1 order is 120.75.

If the Mth stage (e.g., 120th) is displayed 75% of the time, and the M+1st (e.g., 121st) is displayed 25% of the time, then the Mth and M+1st are displayed alternately The tone value of the formed middle tone is 120.25.

The above method is to form different intermediate tones by combining the display time of the Mth step (for example, the 120th step) and the display time of the M+1th step. However, the present invention is not limited thereto, and the present invention can also use the combination of displaying the Mth order (for example, the 120th order) and displaying the M+1th order frequency to form different intermediate tones. In addition, the above method is illustrated by subdividing the 120th step and the 121st step into 3 intermediate tones. But the present invention is not limited thereto, and the present invention can be subdivided into more intermediate tones between the Mth order and the M+1th order according to the requirements of the product.

Please return to FIG. 4A , as mentioned above, in the detection frame 400 , the gray scales displayed by the blocks 20 b (unburned areas) and 20 a are standard gray scales (for example, the 120th gray scale). After comparing the block 20a (burned area) with the block 20b (unburned area), it is found that the boundary between the two blocks 20a and 20b is very obvious. Therefore, referring to FIG. 4B , the block 20a (burning area) is switched to the next mid-tone (for example, 120.25), which is constituted by the editing method in FIG. 6A and FIG. 6B . Similarly, comparing block 20a (burned area) and block 20b (unburned area) in FIG. 4B , the boundary between the two blocks 20a and 20b is still very obvious. Therefore, next, as shown in FIG. 4C , the block 20 a (burning area) is switched to the next mid-tone (for example, 120.5), which is constituted by the editing method in FIG. 5A and FIG. 5B . After that, the block 20a (burned area) in FIG. 4C is compared with the block 20b (unburned area), but the boundary between the two blocks 20a, 20b still exists. Therefore, next, as shown in FIG. 4D , the block 20 a (burning area) is switched to the next mid-tone (for example, 120.75), which is constituted by the editing method in FIG. 7A and FIG. 7B . At this time, it is found that the boundary between the two blocks 20a, 20b in FIG. 4D almost disappears (the slightest), so the intermediate tone (120.75) can be converted into a Burning Grade Rank 1.75.

In the embodiment of FIG. 4A to FIG. 4D, the 120th level is displayed as a standard gray scale in the block 20b (non-burning area), and is switched to be between the 120th level in the block 20a (burning area) Compared with the standard gray scale, the mid-tones 120.25, 120.5, and 120.75 between the 121st step. In another embodiment, for a liquid crystal display that is normally black when it is not driven, the 120th level can also be used as the standard gray scale, and the 119th level can be switched in the block 20b (burning area). Compared with the standard gray scale, the mid-tones 119.25, 119.5, and 119.75 between the 120th order can be used to determine the burning level. In other words, in this embodiment, by further subdividing the three gray levels of 120.25, 120.5, and 120.75 between the 120th and 121st levels, it is possible to further subdivide the rank 1.25, Rank 1.5, Rank 1.75 three levels. Compared with the traditional method which can only determine the burn-in level of the display as Rank 0, 1, 2, 3..., the method of the present invention can determine the burn-in level more accurately.

The above embodiment is illustrated by subdividing gray scales 120.25, 120.5, and 120.75 between tone 120 and 121, and subdividing Rank 1.25, Rank 1.5, and Rank 1.75 between Burning Levels Rank 1 and Rank 2. But the present invention is not limited to the subdivision between the gradations 120 and 121 , and it can also be subdivided between the gradations 119 and 120 . The present invention is not limited to only subdividing into three levels between M and M+1 or M−1 and M, and it can also be subdivided into more levels. Therefore, the method of the present invention can be subdivided in various degrees among the burning ranks of Rank 0-1, 1-2, 2-3 and so on.

In addition, the above-mentioned embodiment is illustrated by taking a normally white liquid crystal display as an example when it is not driven. Therefore, in this embodiment, the burn-in area corresponds to the low-level tones displayed in the burn-in detection screen. (e.g. the 1st order) area. However, the method of the present invention can also be applied to a display that is normally black when not driven, such as a liquid crystal display or a plasma display that is black when not driven. In a display with a black screen when not driven, the burn-in area corresponds to the area in the burn-in detection screen showing high-level tones (for example, the Nth order).

Utilizing the method of the invention can determine the burning degree more accurately, which will be beneficial to the shipment rate of the product. For example, if the buyer requires that the product’s burning level must be below Rank 2 (not including Rank 2) before it can be shipped, then the product that was judged as Rank 2 unshipable in the past may be judged as 1.75 by the method of the present invention, so that it can be shipped smoothly. Shipment.

second embodiment

In order to make the method for detecting the burning phenomenon of the display of the present invention have a more accurate effect, when judging whether the boundary of the picture presented by the burning area 20a and the non-burning area 20b is the slightest in Fig. 4A-4D, it also includes providing An optical measuring instrument (not shown). Such optical measuring instruments may include luminance meters, colorimeters or spectrometers. The images displayed on the display in the burning area 20 a and the non-burning area 20 b are measured by the optical measuring instrument to obtain a first value and a second value respectively. When the first value is substantially the same as the second value, the boundary between the burnt area 20 a and the non-burned area 20 b is the slightest (as shown in FIG. 4D ).

In detail, when the optical measuring instrument is a luminance meter, the first value and the second value are luminance values. In this way, the staff does not need to use human eyes to visually check whether the boundary of the image presented by the burning area 20 a and the non-burning area 20 b is the slightest. In addition to saving manpower to achieve the purpose of automation, it also has a more accurate effect.

third embodiment

In addition to the methods mentioned in the first and second embodiments, this embodiment proposes another method that can automatically determine the burning level, which is described in detail as follows:

The present invention proposes a method for detecting the burn-in phenomenon of a display including the following steps: firstly, providing a display with a plurality of pixels. Then, a burn-in test picture is displayed on the monitor. As shown in FIG. 1 , the adhesion test screen is composed of at least one first pattern 10 a and at least one second pattern 10 b, and the gray scale of the first pattern 10 a is different from that of the second pattern 10 b. Alternatively, as described in the first embodiment, the grayscale of the first pattern 10a may be, for example, the first level, and the grayscale of the second pattern 10b may be, for example, the Nth level. In addition, of course, those skilled in the art should know that the burn-in test screen can be adjusted as needed, such as the burn-in test screen shown in FIG. 2 and FIG. 3 . This embodiment is described by taking FIG. 1 as an example.

After the burning test image is displayed for a period of time, a burning area 20a and an unburning area 20b will be formed on the display as shown in FIG. 8 . In other words, the display at this time is already a display with bad burn-in phenomenon.

Referring to FIG. 4A , the display is switched to a detection screen 400 , where the gray level corresponding to the unbonded area 20 b is an integer (for example, the Mth level). Then, input at least one intermediate tone corresponding to the burning area 20a in the detection screen, and the gray scale of this intermediate tone is between two consecutive integers (for example, between the Mth level and the M+1th level or between the M-th Between the 1st and the Mth order). Because a general display cannot directly display a grayscale image such as 120.25, 120.5, 120.75 or even a finer grayscale tone. Therefore, in the first embodiment of the present invention, it is explained that the middle tone can be edited through space (as shown in FIGS. 5A , 5B, 6A, 6B, 7A and 7B ) or through time edit. It should be particularly noted here that the gray scale of the middle tone may also be between any two consecutive integers, which is not intentionally limited in this embodiment.

Afterwards, in order to automate the process of determining the burn-in level, an image capture device is used in this embodiment to capture the images respectively presented by the burn-in area 20 a and the non-burn-in area 20 b to obtain an image data. The image capture device is, for example, a charge coupled device (CCD). Specifically, the image data captured by the CCD at least includes the values of chromaticity and luminance presented by each pixel in the burnt area 20a and the unbonded area 20b. Afterwards, an image processing program is performed on the image data to obtain an evaluation value D. Then, the evaluation value D is converted into a burning grade. The above is the main flow of the method of the present invention so far.

It should be explained here that the above-mentioned image processing program is a series of processes for performing mathematical operations on the image data, and an example is given here as follows. The image processing program of this embodiment includes: firstly, comparing the difference of chromaticity or luminance of adjacent pixels to calculate a plurality of change values ΔE corresponding to each pixel. Wherein, the change value ΔE may be a color change value ΔC, or a brightness change value ΔB. In one embodiment, the change value ΔE can also change with the chromaticity change value ΔC and the brightness change value ΔB at the same time. partial differential equations.

In this way, the chromaticity change value ΔC and the brightness change value ΔB of each pixel can be known. If there is a clear boundary between the images presented by the burn-in area 20 a and the non-burn-in area 20 b , it means that the chromaticity change value ΔC or the brightness change value ΔB of adjacent pixels is too large, or both are too large. Therefore, a perceivable value JND (Just Noticeable distortion, JND) is provided, and pixels whose change value ΔE is greater than the perceivable value JND are detected to be converted into an evaluation value D. Specifically, the perceivable value JND is, for example, the lowest limit that human eyes can perceive, and when the change value ΔE is greater than the minimum limit, it can be perceived by human eyes.

The method of converting to the evaluation value D is, for example, calculating the sum of the products of the number of pixels greater than the detectable value JND and the corresponding change value ΔE as the evaluation value D. When the number of pixels greater than the detectable value JND is larger, it means that the abnormal region of the image is larger, and the larger the change value ΔE is, the stronger the bad visual experience is. Therefore, the quality of the display is naturally worse.

In other words, the evaluation value D of this embodiment has considered factors such as area, chromaticity, and brightness. Of course, those skilled in the art can customize the conversion method as needed to take different factors into consideration. The conversion method in this embodiment is only for illustration and not intended to be limiting.

It is worth noting that, of course, this embodiment can also adopt the steps shown in FIGS. 4A-4D of the first embodiment: sequentially input multiple intermediate tone to the burning area 20a of the display. The image capture device can capture one by one the images presented by the burned area 20 a and the unburned area 20 b when each intermediate tone is input. When the boundaries of the images respectively presented by the burn-in area 20a and the non-seal-in area 20b are the slightest, the burn-in grade determined in this case can be used.

It should be added here that since the image capture device can capture the chromaticity and brightness data of each pixel, a low-noise image can also be obtained by appropriately blurring the focus of the image capture device or by other means. screen and data. The desired data can be obtained by calculating the chromaticity and brightness data. In order to facilitate the recognition of human eyes, the mathematical operations of these data can be presented in a graphical form. For example, when the change value ΔE corresponding to each pixel is calculated, it can be drawn as a detecting block diagram (detecting block) 500 as shown in FIG. 9A .

It should be noted here that the detection block diagram 500 is not a real color image, but mainly records the positions of each pixel and the characteristics of the corresponding change value ΔE. In detail, the area A will appear approximately the same dark black, the area B will appear approximately the same light gray, and the area C will be a bright area. This means that the change value ΔE of each pixel in area A is approximately the same, the change value ΔE of each pixel in area B is approximately the same, and the change value ΔE of each pixel in area C is abnormal. It should be explained here that although the area C is a bright area, the change value ΔE of each pixel in the area C is not completely consistent or slightly different. In other words, the change value ΔE of each pixel in the region C will be larger than the perceivable value JND. Next, the edge of FIG. 9A can be enhanced to form FIG. 9B.

As shown in FIG. 9B , region A will display a similar deep black color as region B to highlight the brighter areas of region C. In one embodiment, the change value ΔE is processed by strengthening the boundary to calculate a change value ΔE'. Finally, by calculating the sum of the product of the width of the area C and its change value ΔE', the evaluation value D can be obtained, which can be converted into a burnt grade. Of course, the greater the number of abnormal pixels, the greater the width. In the process of the above-mentioned graphic operations, you can also filter the values according to the actual needs to remove the noise of the values that you don’t want to be included in the calculation, or smooth the values to facilitate mathematical operations (such as differentiation), which are not mentioned here. Be limited.

To sum up, since the method of the present invention can be used to determine the degree of burning more accurately, when new process conditions are added to cause changes in the burning taste, it will be possible to more accurately determine the impact of burning caused by the process conditions degree. In addition, the method of the present invention can achieve automation through the image capture device and the image processing program, so as to effectively reduce the inspection cost and improve the inspection quality. In addition, the method of the present invention can be applied to various displays, not limited to liquid crystal displays or plasma display panels. Therefore, its application range is quite wide.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (16)

1. method that detects the burning phenomenon of display comprises:

One display is provided, and it has the GTG contrast on N rank;

Show that on this display one burns attached test pictures, wherein the attached test pictures of this burning is made of at least one first pattern and the collocation of at least one second pattern, and this first pattern has low order GTG contrast, and this second pattern has high-order GTG contrast;

Showing that this burns attached test pictures after a period of time, can on this display, form a burning attached zone and and not burn attached zone, wherein should burn attached zone is this first pattern and this one of them whereabouts of second pattern, and this does not burn attached zone another whereabouts for this first pattern and this second pattern;

This display is switched to one detect picture, be standard gradating M rank to the GTG contrast of should not burn attached regional part in this detection picture wherein, show multiple middle contrast one by one to burning attached regional part then in this detection picture, wherein contrasts are between M+1 rank, M rank to the or M rank, M-1 rank to the in the middle of those; And

When in this detection picture this burns attached zone and this border of not burning attached zone when almost disappearing, be about to this scala media and turn and change one into and burn attached grade.

2. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, shows that to burning attached regional part the method for those the middle contrasts between M+1 rank, M rank to the or M rank, M-1 rank to the comprises in this detection picture:

Make this a part of pixel of burning attached regional part show the GTG contrast on M rank and make another partly pixel show the GTG contrast on M+1 rank or M-1 rank; And

The collocation of the pixel quantity of the GTG contrast by showing these M rank and the pixel quantity height of the GTG contrast that shows M+1 rank or M-1 rank is to constitute contrast in the middle of those.

3. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, shows that to burning attached regional part the method for those the middle contrasts between M+1 rank, M rank to the or M rank, M-1 rank to the comprises in this detection picture:

The GTG contrast on Alternation Display M rank and the GTG contrast on M+1 rank or M-1 rank, the time that wherein shows the GTG contrast on M rank is the very first time, and shows that the time of the GTG contrast on M+1 rank or M-1 rank was second time; And

By the collocation of the very first time and the second time length or frequency, to constitute those middle contrasts.

4. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, this this first pattern and this second pattern that burns in the attached test pictures is that checkerboard type distributes.

5. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, this this first pattern that burns in the attached test pictures is to be positioned at the central authorities that this burns attached test pictures, and this second pattern is centered around around this first pattern.

6. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, this this second pattern that burns in the attached test pictures is to be positioned at the central authorities that this burns attached test pictures, and this first pattern is centered around around this second pattern.

7. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, this display is LCD or Plasmia indicating panel.

8. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, the GTG contrast of this first pattern is the 1st rank, and the GTG contrast of this second pattern is the N rank.

9. the method for the burning phenomenon of detection display as claimed in claim 1 is characterized in that, is judging that this burns attached zone and this border of not burning attached zone when whether almost disappearing, and also comprises:

One optical gauge is provided; And

Measure this display by this optical gauge and burn attached zone and this does not burn the shown picture in attached zone in this, to draw one first numerical value and a second value respectively, when this first numerical value and this second value were identical in fact, this burnt attached zone and is almost disappearance with the border of not burning the picture that attached zone presents.

10. the method for the burning phenomenon of detection display as claimed in claim 9 is characterized in that, this optical gauge comprises brightness photometer, colorimeter or spectrometer.

11. a method that detects the burning phenomenon of display comprises:

One display is provided, has a plurality of pixels;

Show that on this display one burns attached test pictures, wherein the attached test pictures of this burning is made of at least one first pattern and the collocation of at least one second pattern, and the GTG of the GTG of this first pattern and this second pattern is different;

This burns attached test pictures and shows after a period of time that meeting formation one is burnt attached zone and and do not burnt attached zone on this display;

This display is switched to one detect picture, be standard gradating M rank to the GTG contrast of should not burn attached regional part in this detection picture wherein, in this detection picture, import at least a middle contrast then to burning attached zone, the GTG of this centre contrast is between two continuous integral numbers, capture this by an image capture unit and burn attached zone and this does not burn the image that attached zone presents respectively, to obtain an image data, wherein this image data comprises that at least respectively this pixel is burnt attached zone and do not burnt colourity and the briliancy that attached zone presents in this;

This image data is carried out an image processing program, to draw a figure of merit, wherein this image processing program difference of comprising the colourity of comparison neighbor or briliancy calculates a plurality of changing values with corresponding those pixels respectively, and a perceptible value is provided and detects the pixel of those changing values greater than this perceptible value, to convert this figure of merit to; And

Convert this figure of merit to one and burn attached grade.

12. the method for the burning phenomenon of detection display as claimed in claim 11 is characterized in that, the step that converts this figure of merit to comprises: calculate greater than the corresponding variation with it of the number of pixels of this perceptible value long-pending sum total on duty.

13. the method for the burning phenomenon of detection display as claimed in claim 11 is characterized in that, in the step that should burn at least a middle contrast of attached regional input, is to the multiple middle contrast of this burning attached zone input in this detection picture.

14. the method for the burning phenomenon of detection display as claimed in claim 13 is characterized in that, captures one by one when each scala media timing of input by this image capture unit, this burns attached zone and this does not burn the image that attached zone presents.

15. the method for the burning phenomenon of detection display as claimed in claim 14 is characterized in that, this burns attached zone and this and does not burn the image that attached zone presents respectively and comprise that this burns attached zone and this does not burn the image of border, attached zone for almost disappearing.

16. the method for the burning phenomenon of detection display as claimed in claim 11 is characterized in that, this image capture unit comprises charge coupled cell.

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