CN109859719B - Brightness compensation method, compensation circuit and display device thereof - Google Patents
Brightness compensation method, compensation circuit and display device thereof Download PDFInfo
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Abstract
The application discloses a brightness compensation method, a compensation circuit and a display device thereof. The brightness compensation circuit determines a brightness compensation value based on the selected mapping relation and the initial brightness value to adjust the brightness, and comprises a sensing module for detecting an ambient light output light intensity signal; the storage module is used for storing the current and the previously selected mapping relation curves, and the currently selected mapping relation curve corresponds to the light intensity signal; and the judging module is used for evaluating the currently selected mapping relation curve based on the previously selected mapping relation curve to obtain a flicker early warning signal, the flicker early warning signal is invalid, the selected mapping relation is updated according to the currently selected mapping relation curve, and the flicker early warning signal is valid and the selected mapping relation is not updated. According to the invention, the mapping relation is selected to obtain the compensation brightness value according to the current ambient light intensity, the initial data and the prior mapping relation curve so as to adjust the display brightness, thereby ensuring that a user can have good visual experience under the current ambient light and ensuring the display effect of the display device.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a brightness compensation method, a compensation circuit, and a display device thereof.
Background
With the continuous development of mobile terminal technology, the display device is moved to be used in environments with different brightness, and the intensity of ambient light may change frequently, so the screen display brightness of the display device also needs to change accordingly to relieve eye fatigue when people watch the display screen. In order to make the screen of the display device visible in an outdoor strong light environment, a display driving system of the display device generally includes a brightness compensation circuit.
Fig. 1 shows a luminance compensation circuit 100 in the prior art, which includes a selection module 110, an adjustment module 120, and a sensing module 130, wherein the sensing module 130 is used for detecting ambient light in real time and obtaining a light intensity signal light representing the intensity of the ambient light. The selecting module 110 is connected to the sensing module 130, and selects and outputs a corresponding mapping relationship curve remap from a plurality of pre-stored mapping relationship curves according to the light intensity of the received ambient light intensity signal light. The adjusting module 120 adjusts the initial data to be displayed according to the received mapping relationship curve remap to obtain a brightness compensation value and outputs the adjusted gray-scale data pixel.
Specifically, as shown in fig. 2a and 2b, the mapping relationship curve remap represents the corresponding relationship between the gray-scale luminance value of the initial data and the adjusted target luminance value. As can be seen, the light intensity of the ambient light intensity signal light1 in fig. 2a is lower than the light intensity of the ambient light intensity signal light2 in fig. 2b, and therefore, the adjustment strength of the map curve remap1 selected by the driving apparatus 100 according to the two ambient light intensity signals is less than the map curve remap2, i.e. the adjusted gray-scale luminance value of the display data pixel2 is greater than the gray-scale luminance value of the display data pixel 2.
That is, the brightness compensation circuit 100 in the prior art selects a suitable mapping relationship curve in real time according to the change of the ambient light to adjust the gray scale brightness value of the display data, that is, the gray scale brightness value of the display data is adjusted to be high when the ambient light is bright, and the gray scale brightness value of the display data is adjusted to be low when the ambient light is dark, so as to ensure the visibility of the display device under light.
However, in the method for adjusting the gray scale brightness value of the display data according to the ambient light in the prior art, when the ambient light intensity is in a state of instantaneous change, the brightness of the display data is frequently adjusted by the brightness compensation circuit, which may cause a phenomenon of flickering of a picture visible to human eyes on a display screen of the display device, and bring poor visual experience to a user.
In view of the above, it is desirable to provide a brightness compensation method, a compensation circuit and a display device thereof to solve the above technical problems.
Disclosure of Invention
The embodiment of the invention provides a brightness compensation method, a compensation circuit and a display device thereof, which are used for improving the display effect of the display device and the visual experience of a user.
An aspect of the present invention provides a luminance compensation circuit that determines a luminance compensation value based on a selected mapping relationship and an initial luminance value to adjust a display luminance of a display device according to the luminance compensation value and the initial luminance value, including: the sensing module is used for detecting the intensity of ambient light and outputting a light intensity signal representing the current intensity of the ambient light; the storage module is used for storing a plurality of continuous mapping relation curves which are selected currently and are selected previously, and the currently selected mapping relation curve corresponds to the received light intensity signal; and the judging module is connected with the storage module, evaluates the currently selected mapping relation curve based on a plurality of continuous mapping relation curves selected in advance, and provides a flicker early warning signal according to an evaluation result, wherein when the flicker early warning signal is invalid, the judging module updates the selected mapping relation according to the currently selected mapping relation curve, and when the flicker early warning signal is valid, the judging module does not update the selected mapping relation.
Optionally, the storage module comprises: the first storage unit is used for storing the currently selected mapping relation curve; and a second storage unit that stores a curve corresponding to the selected mapping relationship as the previously selected mapping relationship curve. .
Optionally, the judging module provides the flashing warning signal according to a variation trend of a plurality of continuous mapping relation curves selected currently and previously.
Optionally, the judging module includes a registering unit, which is respectively connected to the first storage unit and the second storage unit, and is configured to register the currently selected mapping relationship curve and the mapping relationship curve that is adjacent to the currently selected mapping relationship curve and is selected in advance; the calculation unit is connected with the register unit and used for calculating a change value between brightness compensation values, and the brightness compensation values are obtained respectively based on the mapping relation curve in the register unit and the initial brightness value; the comparison unit is connected with the calculation unit, and when the change value is within a preset range, the change trend of the currently selected mapping relation curve is consistent with that of a plurality of previously selected continuous mapping relation curves, and the provided flicker early warning signal is invalid; when the change value is not in the preset range, the change trend of the currently selected mapping relation curve is inconsistent with the change trend of the previously selected continuous mapping relation curves, and the provided flicker early warning signal is effective.
Optionally, the brightness compensation circuit further includes a selection module, which presets a plurality of mapping relationship curves, and selects, based on the received light intensity signal, a mapping relationship curve corresponding to the current light intensity signal, where one of a horizontal axis and a vertical axis of each mapping relationship curve represents the initial brightness value, and the other of the horizontal axis and the vertical axis of each mapping relationship curve represents the brightness compensation value matched with the current ambient light intensity.
Optionally, the apparatus further includes a counting unit, configured to count a number of frames that the currently selected mapping relationship lasts after the selected mapping relationship is updated each time, where the determining module evaluates the currently selected mapping relationship curve according to the number of frames that the currently selected mapping relationship lasts after the previously updated selected mapping relationship, and provides the flicker warning signal, where the number of frames that the currently selected mapping relationship lasts after the currently updated selected mapping relationship is greater than or equal to a preset number of frames, the flicker warning signal is invalid, and the number of frames that the currently selected mapping relationship lasts after the currently updated selected mapping relationship is smaller than the preset number of frames, the flicker warning signal is valid.
According to another aspect of the present invention, there is provided a brightness compensation method for adjusting display brightness of a display device, the brightness compensation method including detecting ambient light intensity, and outputting a light intensity signal representing current ambient light intensity; selecting a corresponding mapping relation curve at present based on the received light intensity signal; storing a plurality of continuous mapping relation curves which are selected currently and are selected firstly; evaluating the currently selected mapping relation curve based on a plurality of previously selected continuous mapping relation curves, and providing a flicker early warning signal according to an evaluation result; when the flicker early warning signal is invalid, updating a selected mapping relation according to the currently selected mapping relation curve, and when the flicker early warning signal is valid, not updating the selected mapping relation; and determining a brightness compensation value based on the selected mapping relation and an initial brightness value, wherein the display device adjusts the display brightness according to the brightness compensation value and the initial brightness value.
Optionally, the step of evaluating the currently selected mapping relationship curve based on a plurality of previously selected consecutive mapping relationship curves, and providing a blinking warning signal according to an evaluation result includes: and providing the flicker early warning signal according to the change trend of the plurality of continuous mapping relation curves selected currently and previously.
Optionally, the method further comprises: calculating a variation value between brightness compensation values, which are obtained based on the plurality of mapping relationship curves and the initial brightness value, respectively; if the change value is within the threshold range, the change trend of the currently selected mapping relation curve is consistent with the change trend of the previously selected continuous multiple mapping relation curves, the flicker early warning signal is invalid, and if the change value is not within the preset range, the change trend of the currently selected mapping relation curve is inconsistent with the change trend of the previously selected continuous multiple mapping relation curves, and the flicker early warning signal is valid.
Optionally, the step of evaluating the currently selected mapping relationship curve based on a plurality of previously selected consecutive mapping relationship curves, and providing a blinking warning signal according to an evaluation result includes: counting the frame number of the continuous pictures of the current selected mapping relation after updating the selected mapping relation every time; and evaluating the currently selected mapping relation curve according to the frame number of the continuous pictures after the selected mapping relation is updated for the previous time, and providing the flicker early warning signal, wherein the frame number of the continuous pictures after the selected mapping relation is updated for the current time is more than or equal to the preset frame number, the flicker early warning signal is invalid, and the frame number of the continuous pictures after the selected mapping relation is updated for the current time is less than the preset frame number, and the flicker early warning signal is valid.
According to another aspect of the present invention, there is provided a display device including the luminance compensation circuit provided above.
According to the brightness compensation method, the compensation circuit and the display device thereof, the brightness compensation value is determined by selecting the mapping relation and the initial brightness value of the initial data, and then the display brightness of the display device is adjusted according to the brightness compensation value and the initial brightness value. The mapping relation curve corresponding to the selected mapping relation for adjusting the display brightness is selected based on a plurality of previously selected mapping relation curves and the current ambient light intensity. The display device has the advantages that the display brightness of the display device is guaranteed to be matched with the current ambient light intensity, and meanwhile the problem of flicker of a display picture caused by frequent adjustment of the display brightness is avoided.
Preferably, the brightness compensation circuit provided by the invention selects the current mapping relationship curve according to the current ambient light intensity and the initial data, then evaluates the currently selected mapping relationship curve based on a plurality of continuous prior mapping relationship curves and provides a flicker warning signal, and controls whether the selected mapping relationship is updated or not according to the flicker warning signal, so that the selected mapping relationship for adjusting the display brightness is satisfied on the basis of the current ambient light intensity, the display effect can be ensured, and the problem of display image flicker caused by frequent change of the ambient light intensity is avoided. The method and the device provide the flicker early warning signal according to the current ambient light intensity, the initial brightness value of the initial data and the adjusting state of the prior mapping relation curve, and further control the determined selected mapping relation to adjust the display brightness of the display device according to the flicker early warning signal, so that the user can have good visual experience under the current ambient light, and the display effect of the display device is guaranteed.
Preferably, the method evaluates the currently selected mapping relation curve according to the change trend of the previously selected mapping relation curve, further provides a flicker early warning signal according to the evaluation result to control whether the selected mapping relation is updated or not, and determines a brightness compensation value according to the selected mapping relation to adjust the display brightness so that the display brightness is adapted to the current ambient light intensity, thereby ensuring that a user still has good visual experience in the changed light environment.
Preferably, the invention can also evaluate the currently selected mapping relation curve according to the frame number of the picture which lasts after the selected mapping relation is updated last time, and further provide a flicker early warning signal according to the evaluation result, thereby controlling whether the selected mapping relation is updated or not. Specifically, whether the number of picture frames that last after the previously updated selected mapping is within the preset frame number determines whether the selected mapping is updated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
Fig. 1 shows a schematic diagram of a luminance compensation circuit according to the prior art.
Fig. 2 shows a driving principle schematic diagram of a brightness compensation circuit according to the prior art.
Fig. 3 shows a schematic configuration diagram of a luminance compensation circuit according to a first embodiment of the present invention.
Fig. 4 shows a flow chart of the brightness compensation method according to the first embodiment of the present invention.
Fig. 5 shows a schematic configuration diagram of a luminance compensation circuit according to a second embodiment of the present invention.
Fig. 6 is a flowchart illustrating a brightness compensation method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Fig. 3 shows a schematic configuration diagram of a luminance compensation circuit according to a first embodiment of the present invention.
Fig. 4 shows a flow chart of the brightness compensation method according to the first embodiment of the present invention.
As shown in fig. 3, the luminance compensation circuit 200 includes a sensing module 250, a selecting module 210, a first storing module 230, a determining module 240, and an adjusting module 220.
The adjusting module 220 determines a brightness compensation value based on the selected mapping relationship and the initial brightness value represented by the initial data, and the display device obtains the adjusted gray-scale data pixel according to the brightness compensation value and the initial brightness value represented by the initial data, so as to adjust the display brightness. The initial data comes from, for example, a control system of the display device.
The sensing module 250 is used for detecting the intensity of the ambient light and outputting a light intensity signal light representing the environmental viewing intensity according to a set frequency, and the sensing module 250 is, for example, a light sensing element, such as a light sensor, installed on the screen of the display device.
The selecting module 210 is connected to the sensing module 250 to receive the light intensity signal light, and selects a mapping relation curve matching with the current ambient light intensity from a plurality of preset curves according to the current light intensity signal light. The horizontal axis of the preset curves represents an initial brightness value corresponding to the gray scale value of the initial data, for example, and the vertical axis represents a brightness compensation value matching the current ambient light intensity, for example, the curves are used for representing the mapping relationship between the initial brightness value and the compensation brightness value, and the representation values of the horizontal axis and the vertical axis of the curves are not limited to the above description, and the representation values of the horizontal axis and the vertical axis may be interchanged. Wherein a preset number of curves is stored, for example, in at least one register.
The storage module 230 is configured to store a plurality of mapping curves that are currently and previously selected. The storage module 230 includes a first storage unit 231 and a second storage unit 232, the first storage unit 231 is connected to the selection module 210, and is configured to store the currently selected mapping relationship curve; the second storage unit 232 is connected to the adjustment module 220, and stores the mapping relationship curve corresponding to the selected mapping relationship as the previously selected mapping relationship curve.
The judging module 240 is connected to the storage module 230, evaluates the currently selected mapping relationship curve based on the previously selected continuous mapping relationship curves, and provides a flicker warning signal ctrl according to the evaluation result. Specifically, when the flicker warning signal ctrl is invalid, the determining module 240 controls to update the selected mapping relationship in the adjusting module 220 according to the currently selected mapping relationship curve, and when the flicker warning signal ctrl is valid, the determining module 240 does not update the selected mapping relationship in the adjusting module 220.
Preferably, the determining module 240 provides the flashing warning signal according to the variation trend of the plurality of mapping relationship curves selected currently and in advance. Specifically, the judging module 240 includes a registering unit, a calculating unit, and a comparing unit. The register unit is respectively connected to the first storage unit 231 and the second storage unit 232, and is configured to register the currently selected mapping relationship curve and the mapping relationship curve that is adjacent to the currently selected mapping relationship curve and is selected in advance. The calculation unit is connected with the register unit and used for calculating the variation values among the brightness compensation values, and the brightness compensation values are obtained respectively based on the mapping relation curve and the initial brightness value in the register unit. The comparison unit is connected with the calculation unit, when the change value is in a preset range, the change trend of the currently selected mapping relation curve is consistent with the change trend of the previously selected continuous multiple mapping relation curves, the provided flicker early warning signal ctrl is invalid, and the selected mapping relation in the adjustment module 220 is controlled and updated according to the currently selected mapping relation curve; when the variation value is not within the preset range, the variation trend of the currently selected mapping relationship curve is inconsistent with the variation trend of the previously selected continuous multiple mapping relationship curves, the provided flicker warning signal ctrl is valid, and the selected mapping relationship in the adjusting module 220 is not updated at this time.
The brightness compensation circuit provided by the embodiment ensures normal display of the display screen of the display device, and simultaneously improves the visual experience of a user in an unstable light environment.
As shown in fig. 4, a flow chart of the luminance compensation circuit 200 executing the luminance compensation method is shown, and the specific steps of the luminance compensation method are as follows:
step S101: the ambient light intensity is detected. The sensing module 250 outputs a light intensity signal light representing the current ambient light intensity according to the set frequency.
Step S102: and selecting a corresponding mapping relation curve at present based on the light intensity signal. The selection module 210 obtains a mapping relationship curve adapted to the current ambient light intensity according to the light intensity signal light output by the sensing module 250 and outputs the mapping relationship curve.
Step S103: and storing a plurality of continuous mapping relation curves which are currently and previously selected and taken out. The first storage unit 231 of the storage module 230 is connected to the selection module 210 to store the currently selected mapping relationship curve, and the second storage unit 232 is connected to the adjustment module 220 to store a plurality of previously selected continuous mapping relationship curves.
Step S104: and providing a flicker early warning signal according to the variation trend of the plurality of continuous mapping relation curves selected currently and previously. Specifically, a variation value between luminance compensation values obtained based on the plurality of mapping relationship curves and the initial luminance value, respectively, is calculated. If the variation value is within the threshold range, the variation trend of the currently selected mapping relation curve is consistent with the variation trend of the previously selected continuous multiple mapping relation curves, the flicker warning signal ctrl is invalid, and if the variation value is not within the preset range, the variation trend of the currently selected mapping relation curve is inconsistent with the variation trend of the previously selected continuous multiple mapping relation curves, and the flicker warning signal ctrl is valid.
Step S105: and controlling the selected mapping relation to be updated according to the flicker early warning signal. When the flicker warning signal ctrl is invalid, the determining module 240 updates the selected mapping relationship in the adjusting module 220 according to the currently selected mapping relationship curve, and when the flicker warning signal ctrl is valid, does not update the selected mapping relationship in the adjusting module 220.
Step S106: and obtaining a brightness compensation value based on the selected mapping relation so as to adjust the display brightness. The adjusting module 220 determines a brightness compensation value based on the selected mapping relationship and the initial brightness value of the initial data, and the display device adjusts the display brightness according to the brightness compensation value and the initial brightness value.
Fig. 5 shows a schematic configuration diagram of a luminance compensation circuit according to a second embodiment of the present invention.
Fig. 6 is a flowchart illustrating a brightness compensation method according to a second embodiment of the present invention.
The second embodiment of the present invention provides a luminance compensation circuit 300, which includes: a sensing module 350, a selecting module 310, a judging module 340, an adjusting module 320, and a storing module 330.
The second embodiment proposes another rule for evaluating the currently selected mapping relationship curve based on the first embodiment.
Specifically, in the present embodiment, on the basis of the first embodiment, the storage module 330 includes a first storage unit 331, a second storage unit 332, and a counting unit 333.
The first storage unit 331 is connected to the selection module 310 for storing the currently selected mapping relationship curve. The second storage unit 332 is connected to the adjustment module 320 for receiving the previously selected mapping curve, and the technical unit 333 is connected to the second storage unit 232 for counting the number of frames of the picture that the currently selected mapping continues after each update of the selected mapping.
The determining module 340 is connected to the storing module 330, and evaluates the currently selected mapping relationship curve according to the number of frames of the image that last after the previously updated selected mapping relationship, and provides the flicker warning signal ctrl to the adjusting module 320. If the number of continuous frames after the selected mapping relationship is updated for the current time is greater than or equal to the preset number of frames, the flicker warning signal ctrl is invalid, and the determining module 340 controls to update the selected mapping relationship in the adjusting module 320 according to the currently selected mapping relationship curve; if the number of frames of the image that last after the selected mapping relationship is updated for the current time is less than the preset number of frames, the flicker warning signal ctrl is valid, and the determining module 340 does not update the selected mapping relationship in the adjusting module 320.
In this embodiment, except that the evaluation principle of evaluating the currently selected mapping relationship curve is different from the scheme of the first embodiment, the working principles of the other modules are the same as those of the first embodiment, and thus are not described herein again.
The brightness compensation circuit provided in the above embodiment selects the mapping relationship according to the adjustment effect of the acquired mapping relationship curve, that is, the number of frames that the updated selected mapping relationship corresponds to the continued mapping relationship curve, so as to adjust and compensate the initial data to convert the initial data into the gray scale data adapted to the current ambient light intensity. The normal display of the display screen of the display device is guaranteed, and the visual experience of a user in an unstable light environment is improved.
As shown in fig. 6, a flow chart of the luminance compensation circuit 300 executing the luminance compensation method is shown, and the specific steps of the luminance compensation method are as follows:
step S201: the ambient light intensity is detected. The sensing module 350 outputs a light intensity signal light representing the current ambient light intensity according to the set frequency.
Step S202: and selecting a corresponding mapping relation curve at present based on the light intensity signal. The selection module 310 obtains a mapping relationship curve adapted to the current ambient light intensity according to the light intensity signal light output by the sensing module 350 and outputs the mapping relationship curve.
Step S203: and storing a plurality of continuous mapping relation curves which are currently and previously selected and taken out. The first storage unit 331 of the storage module 330 is connected to the selection module 310 to store the currently selected mapping relationship curve, and the second storage unit 332 is connected to the adjustment module 320 to store a plurality of previously selected continuous mapping relationship curves.
Step S204: the number of frames of pictures for which the currently selected mapping persists is counted after each update of the selected mapping. The counting unit 333 of the storage module 330 is used for counting the number of frames of pictures for which the currently selected mapping persists after each updating of the selected mapping.
Step S205: and providing a flicker early warning signal according to the frame number of the continuous pictures after the selected mapping relation is updated last time. And evaluating the currently selected mapping relation curve according to the frame number of the continuous pictures after the selected mapping relation is updated for the previous time, and providing the flicker early warning signal ctrl, wherein the frame number of the continuous pictures after the selected mapping relation is updated for the current time is more than or equal to the preset frame number, the flicker early warning signal ctrl is invalid, and the frame number of the continuous pictures after the selected mapping relation is updated for the current time is less than the preset frame number, the flicker early warning signal ctrl is valid.
Step S206: and controlling the selected mapping relation to be updated according to the flicker early warning signal. When the flicker warning signal ctrl is invalid, the determining module 340 updates the selected mapping relationship in the adjusting module 320 according to the currently selected mapping relationship curve, and when the flicker warning signal ctrl is valid, does not update the selected mapping relationship in the adjusting module 320.
Step S207: and obtaining a brightness compensation value based on the selected mapping relation so as to adjust the display brightness. The adjusting module 320 determines a brightness compensation value based on the selected mapping relationship and the initial brightness value of the initial data, and the display device adjusts the display brightness according to the brightness compensation value and the initial brightness value.
The preset frame number and the preset range related in the embodiment of the invention are the minimum required coefficients which can ensure that the display screen does not have flicker. And the preset frequency not only reduces the frequency of brightness compensation, but also can give consideration to the quality of the display picture of the display screen, reduce the unnecessary calculation amount and avoid the technical problem of picture flicker.
It is noted that, herein, 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.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (11)
1. A brightness compensation circuit for determining a brightness compensation value based on a selected mapping relationship and an initial brightness value to adjust a display brightness of a display device according to the brightness compensation value and the initial brightness value, comprising:
the sensing module is used for detecting the intensity of ambient light and outputting a light intensity signal representing the current intensity of the ambient light;
the storage module is used for storing a plurality of continuous mapping relation curves which are selected currently and are selected firstly, the selected currently mapping relation curve corresponds to the received light intensity signal, and the plurality of continuous mapping relation curves which are selected firstly are the mapping relation curves corresponding to the selected previously;
a judging module connected with the storage module, evaluating the currently selected mapping relation curve based on the previously selected continuous multiple mapping relation curves, and providing a flicker early warning signal according to the evaluation result,
when the flicker early warning signal is invalid, the judging module updates the selected mapping relation according to the currently selected mapping relation curve, and when the flicker early warning signal is valid, the judging module does not update the selected mapping relation.
2. The luminance compensation circuit according to claim 1, wherein the storage module comprises:
the first storage unit is used for storing the currently selected mapping relation curve; and
and the second storage unit is used for storing the curve corresponding to the selected mapping relation as the previously selected mapping relation curve.
3. The luminance compensation circuit of claim 2, wherein the determining module provides the flicker warning signal according to a variation trend of a plurality of consecutive mapping curves selected currently and previously.
4. The luminance compensation circuit of claim 3, wherein the determining module comprises:
the registering unit is respectively connected with the first storage unit and the second storage unit and is used for registering the currently selected mapping relation curve and the mapping relation curve which is adjacent to the currently selected mapping relation curve and is selected in advance;
the calculation unit is connected with the register unit and used for calculating a change value between brightness compensation values, and the brightness compensation values are obtained respectively based on the mapping relation curve in the register unit and the initial brightness value;
the comparison unit is connected with the calculation unit, and when the change value is within a preset range, the change trend of the currently selected mapping relation curve is consistent with that of a plurality of previously selected continuous mapping relation curves, and the provided flicker early warning signal is invalid; when the change value is not in the preset range, the change trend of the currently selected mapping relation curve is inconsistent with the change trend of the previously selected continuous mapping relation curves, and the provided flicker early warning signal is effective.
5. The luminance compensation circuit according to claim 1, wherein the luminance compensation circuit further comprises:
and the selection module presets a plurality of mapping relation curves, selects the mapping relation curve corresponding to the current light intensity signal based on the received light intensity signal, wherein one of a horizontal axis and a vertical axis of each mapping relation curve represents the initial brightness value, and the other of the horizontal axis and the vertical axis of each mapping relation curve represents the brightness compensation value matched with the current ambient light intensity.
6. The luminance compensation circuit according to claim 2, further comprising:
a counting unit for counting the number of frames of pictures in which the selected mapping relation is continued after updating the selected mapping relation each time,
wherein the judging module evaluates the currently selected mapping relation curve according to the frame number of the pictures which last updated the selected mapping relation at the previous time and provides the flicker early warning signal,
if the number of continuous frames after the selected mapping relation is updated for the current time is more than or equal to the preset number of frames, the flicker early warning signal is invalid,
and if the frame number of the continuous pictures after the selected mapping relation is updated for the current time is less than the preset frame number, the flicker early warning signal is effective.
7. A brightness compensation method for adjusting display brightness of a display device, the brightness compensation method comprising:
detecting the intensity of ambient light, and outputting a light intensity signal representing the current intensity of the ambient light;
selecting a corresponding mapping relation curve at present based on the received light intensity signal;
storing a plurality of continuous mapping relation curves which are selected and taken out at present and at first, wherein the plurality of continuous mapping relation curves which are selected and taken out at first are mapping relation curves corresponding to the mapping relation selected at first;
evaluating the currently selected mapping relation curve based on a plurality of previously selected continuous mapping relation curves, and providing a flicker early warning signal according to an evaluation result;
when the flicker early warning signal is invalid, updating a selected mapping relation according to the currently selected mapping relation curve, and when the flicker early warning signal is valid, not updating the selected mapping relation; and
and determining a brightness compensation value based on the selected mapping relation and the initial brightness value, and adjusting the display brightness according to the brightness compensation value and the initial brightness value by the display device.
8. The luminance compensation method as claimed in claim 7, wherein the step of evaluating the currently selected mapping relationship curve based on a plurality of previously selected consecutive mapping relationship curves and providing a blinking warning signal according to the evaluation result comprises:
and providing the flicker early warning signal according to the change trend of the plurality of continuous mapping relation curves selected currently and previously.
9. The luminance compensation method according to claim 8, further comprising:
calculating a variation value between brightness compensation values, which are obtained based on the plurality of mapping relationship curves and the initial brightness value, respectively;
if the change value is within the threshold value range, the change trend of the currently selected mapping relation curve is consistent with the change trend of a plurality of previously selected continuous mapping relation curves, the flicker early warning signal is invalid,
if the change value is not in the preset range, the change trend of the currently selected mapping relation curve is inconsistent with the change trend of the previously selected continuous multiple mapping relation curves, and the flicker early warning signal is effective.
10. The luminance compensation method as claimed in claim 7, wherein the step of evaluating the currently selected mapping relationship curve based on a plurality of previously selected consecutive mapping relationship curves and providing a blinking warning signal according to the evaluation result comprises:
counting the frame number of the continuous pictures of the current selected mapping relation after updating the selected mapping relation every time;
evaluating the currently selected mapping relation curve according to the frame number of the pictures which last updated the selected mapping relation at the previous time, and providing the flicker early warning signal,
if the number of continuous frames after the selected mapping relation is updated for the current time is more than or equal to the preset number of frames, the flicker early warning signal is invalid,
and if the frame number of the continuous pictures after the selected mapping relation is updated for the current time is less than the preset frame number, the flicker early warning signal is effective.
11. A display device comprising the luminance compensation circuit according to any one of claims 1 to 6.
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