CN116469339A - Display brightness uniformity regulating and controlling method, display equipment and storage medium - Google Patents
Display brightness uniformity regulating and controlling method, display equipment and storage medium Download PDFInfo
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 44
- 230000001276 controlling effect Effects 0.000 title claims abstract description 35
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- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to the technical field of display, and particularly discloses a display brightness uniformity regulating and controlling method, display equipment and a storage medium. The method for regulating and controlling the display brightness uniformity comprises the following steps: obtaining the current temperatures of a plurality of display areas on the display device in a regional mode; in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated to make the display brightness of the plurality of display regions uniform. By the method, the problem of uneven brightness of the display area in the display equipment can be solved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method for adjusting and controlling uniformity of display brightness, a display device, and a storage medium.
Background
With the rapid development of modern industrial technology, display screens are increasingly being widely used in various industrial technology fields. The display screen is low in manufacturing cost and easy to manufacture, and can emit light sources with various brightness and colors according to the actual requirements of display equipment.
However, when the display screen displays a white picture with high brightness for a long time, the phenomenon that the periphery of a display area in the display screen is reddish and the middle of the display area is greenish, commonly called as cyan spots. In the long-term research and development process, the inventor finds that the cyan spot phenomenon occurs because the display area in the display screen comprises three light-emitting devices with red, green and blue colors, but the light-emitting intensity curves of the three light-emitting devices with the red, green and blue colors are inconsistent with each other along with the temperature change curve, and the light-emitting devices with the different colors of red, green and blue are different in brightness attenuation speed along with the rising of the ambient temperature, so that the heat dissipation of the middle part of the display area in the display screen is much worse than the heat dissipation of the edge part of the display area, and the phenomenon of uneven brightness is generated between the middle part and the edge part of the display area in the display screen.
Disclosure of Invention
The invention mainly solves the technical problem of providing a regulating and controlling method for display brightness uniformity, display equipment and a storage medium, and can solve the problem of uneven display brightness in the display equipment.
In order to solve the technical problems, the invention adopts a technical scheme that: the method for regulating and controlling the display brightness uniformity comprises the following steps: obtaining the current temperatures of a plurality of display areas on the display device in a regional mode; in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated to make the display brightness of the plurality of display regions uniform.
In one embodiment, compensating for display brightness of a display area includes: and regulating and controlling the driving current and/or the light emitting duration of the light emitting device in the display area so as to regulate and control the display brightness of the display area.
In one embodiment, compensating for display brightness of a display area includes: acquiring attenuation amplitude values of all light emitting devices in a display area; generating a compensation coefficient based on the attenuation amplitude;
and regulating the driving current and/or the light emitting duration of each light emitting device in the display area based on the compensation coefficient, so that the regulated driving current and/or light emitting duration=X+ the driving current and/or light emitting duration before regulation, wherein X is the compensation coefficient, and the compensation coefficients of different light emitting devices are the same or different.
In one embodiment, obtaining the attenuation magnitude of each light emitting device in the display area includes: acquiring a temperature change value between the current temperature and the initial temperature of the display area; and obtaining the attenuation amplitude based on the corresponding relation between the temperature change value and/or the current temperature and the brightness attenuation rate of the light-emitting device.
In one embodiment, compensating the display brightness of the display area further includes: in response to the display luminance of the display region being lower than that of the other display regions, the driving current and/or the light emission period of the light emitting device in the display region having the low luminance is increased.
In an embodiment, the method for adjusting and controlling the uniformity of the display brightness further includes: subtracting the minimum temperature value from the maximum temperature value of the display areas to obtain the maximum temperature difference of the display areas; judging whether the maximum temperature difference is larger than a threshold value or not; and compensating the display brightness of the display area in response to the maximum temperature difference being greater than the threshold value.
In an embodiment, the method for adjusting and controlling the uniformity of the display brightness further includes: acquiring average temperatures of a plurality of display areas; and taking the display brightness corresponding to the average temperature as reference brightness to regulate and control the display brightness of the plurality of display areas to be the reference brightness.
In order to solve the technical problems, the invention adopts another technical scheme that: a display device is provided. The display device includes: the device comprises a display unit, a controller and a temperature sensor, wherein the temperature sensor is used for acquiring the current temperatures of a plurality of display areas of the display unit; the controller is used for executing instructions to realize the regulation and control method for the display brightness uniformity according to any one of the above.
In an embodiment, the display device further comprises a memory for storing a luminance decay versus temperature curve of the light emitting device.
In order to solve the technical problems, the invention adopts another technical scheme that: there is provided a computer-readable storage medium storing instructions/program data executable to implement a method of controlling display luminance uniformity as any one of the above.
The beneficial effects of the invention are as follows: different from the prior art, the invention particularly discloses a regulating and controlling method for display brightness uniformity, display equipment and a storage medium. The method for regulating and controlling the display brightness uniformity comprises the following steps: obtaining the current temperatures of a plurality of display areas on the display device in a regional mode; in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated to make the display brightness of the plurality of display regions uniform. The temperature of the display areas is obtained through the division, the display difference of the display areas is obtained through the temperature difference, and then the display brightness is compensated, so that the brightness of the display areas is compensated in a fine and controllable mode. By the mode, the invention can solve the problem of uneven brightness of the display area in the display equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a flow chart illustrating an embodiment of a method for controlling luminance uniformity according to the present invention;
FIG. 2 is a graph showing the relationship between temperature and brightness of different light emitting devices in a display area according to the present invention;
FIG. 3 is a flow chart of another embodiment of a method for controlling luminance uniformity according to the present invention;
FIG. 4 is a schematic diagram of the current temperatures of a plurality of display areas after a period of operation of the display device of the present invention;
FIG. 5 is a flow chart of another embodiment of a method for controlling luminance uniformity according to the present invention;
fig. 6 is a schematic structural view of an embodiment of the display device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The method for regulating and controlling the uniformity of the display brightness is applied to the display equipment. The display device comprises electronic devices such as a smart phone, a tablet personal computer, an intelligent wearable device, a digital audio and video player, an electronic reader, a handheld game machine, a vehicle-mounted electronic device and the like. In an embodiment of the present invention, a display apparatus is provided with a display screen, which is a display screen constituted by a plurality of light emitting devices of different colors that emit colored light when energized.
Alternatively, the display screen may be an LED (Light Emitting Diode ) display screen, or may be an OLED (Organic Light-Emitting Diode) display screen, or may be other types of display screens, which is not limited in this disclosure.
Referring to fig. 1, fig. 1 is a flow chart illustrating an embodiment of a method for adjusting brightness uniformity according to the present invention, the method includes:
step 101: the current temperatures of a plurality of display areas on the display device are acquired in a zoning mode.
The display device is provided with a display screen comprising at least one light emitting device. For example, the display screen may include a combination of one or more of different color light emitting devices such as blue light emitting devices, red light emitting devices, green light emitting devices, and the like. The display device is caused to display a corresponding display screen by driving the light emitting device to display a corresponding display luminance.
Because the luminous intensity (namely, the brightness) of the luminous devices with different colors is different along with the temperature change of the display screen, the display screen of the display device can have strong display brightness of part of display areas and weak display brightness of part of display areas in the process of displaying pictures, so that the display screen has uneven brightness. In order to improve the problem of uneven display brightness, the application provides a display brightness uniformity regulating and controlling method, wherein the attenuation degree of light emitting devices with different colors is obtained by obtaining the current temperature of each display area in a display screen, and then targeted compensation is carried out.
Optionally, the display screen may be divided into a plurality of display areas, so as to obtain the current temperature of each display area in the display screen. For example, the display screen may be divided into a plurality of display areas in the form of a matrix array. The number of rows and columns of the matrix array may be preset according to user experience, and are not particularly limited herein. For example, a display screen in a display device may be divided into 16 display areas in a 4×4 matrix array. Alternatively, a display screen in a display device may be divided into a plurality of display areas according to functional areas, wherein the functional areas may include a status bar, a main display area, a virtual key bar, and the like.
It should be noted that the above two dividing modes are merely examples provided in the embodiments of the present invention, and the mode of dividing the display screen in the display device into a plurality of display areas in the present invention is not limited thereto.
In practical application, the display screen may be formed by splicing a plurality of mutually independent sub-display screens. The above-mentioned way of dividing the display screen into a plurality of display areas is still applicable at this time. Of course, each independent sub-display screen can be used as a display area, so as to obtain the current temperature of each display area.
Alternatively, the current temperatures of the plurality of display areas on the display device may be obtained by the temperature detection device in areas. The temperature detection device may be, for example, a temperature sensor, at least one temperature sensor for each display area, and the current temperatures of the plurality of display areas on the display device are obtained by the temperature sensors in the areas. Of course, the current temperatures of the multiple display areas may also be acquired by other devices, which is not limited in this application.
Wherein the current temperature of the plurality of display areas refers to a real-time temperature of each of the plurality of display areas. The temperature sensor is mainly used for acquiring the current temperature of the corresponding display area and transmitting the acquired current temperature of the corresponding display area to the controller of the display device. It should be noted that, the current temperature of the corresponding display area is obtained, which is essentially the current temperature of the light emitting device in the display area.
In order to improve the accuracy of detecting the current temperature, the temperature sensor can be directly attached to the back of the corresponding display area, or a certain gap can be formed between the temperature sensor and the back of the corresponding display area, so long as the current temperature of the corresponding display area can be accurately detected. In addition, the temperature sensor may be disposed at a position that is opposite to the back surface of the corresponding display area and is close to the center, so as to further improve the accuracy of the current temperature detection of the corresponding display area.
Alternatively, the temperature measurement accuracy of the temperature sensor may be less than or equal to 1 ℃ to improve the accuracy of the current temperature detection for each display area. In a possible embodiment, the temperature sensor may be a thin film transistor (Thin Film Transistor, abbreviated as TFT), for example, the thin film transistor may be an amorphous silicon (α -Si), polysilicon (polysilicon) or oxide (oxide) transistor, and the thin film transistor may be a top gate structure or a bottom gate structure. The thin film transistor increases along with the temperature, the current increases, the temperature of a plurality of display areas can be obtained by detecting the current of the thin film transistor, and the temperature sensor is not required to be additionally arranged in the arrangement mode, so that the structure is simpler.
Step 102: in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated to make the display brightness of the plurality of display regions uniform.
After the current temperatures of the display areas on the display device are obtained by the subareas, the temperature difference of the current temperatures after a period of operation among the display areas can be calculated, wherein the temperature difference among the display areas refers to the temperature difference of the current temperatures after a period of operation among every two display areas. And comparing the calculated temperature difference between every two display areas in the plurality of display areas with a threshold value one by one, and compensating the brightness of the display areas when the calculated temperature difference of the display areas is larger than the threshold value so that the display brightness of the plurality of display areas is uniform.
The temperature difference between the display areas indirectly reflects the difference of the display consistency of the display areas, and the calculated temperature difference of the display areas is respectively compared with a threshold value through presetting the threshold value. When the calculated temperature difference of the display area is larger than the threshold value, the display consistency difference between the display area and other display areas is larger. The brightness of the display area needs to be compensated to make the display brightness of the plurality of display areas uniform. When the calculated temperature difference of the display area is smaller than or equal to the threshold value, the display consistency difference of the display area and other display areas is not large. At this time, the brightness of the display area is not required to be compensated, and the display area keeps the current brightness to continue to operate. Further, the brightness of the display area is compensated again until the calculated temperature difference of the display area is larger than the threshold value again. Thus, the display brightness of the plurality of display areas can be made uniform.
The current temperatures of the display areas are obtained through the subareas, and the display brightness of the display areas with the temperature difference between the display areas being larger than the threshold value is compensated, so that the brightness of the display areas is compensated in a fine and controllable mode. So that the display brightness of the display areas is uniform, and the display effect is further improved.
In one embodiment, the temperature difference between the plurality of display areas may be calculated by means of a time polling. That is, a certain interval time is preset, and when the operation time of the display device is an integer multiple of the preset interval time, a temperature difference between an initial temperature before the plurality of display areas are not operated and a current temperature after the plurality of display areas are operated for a period of time is calculated. And comparing the calculated temperature difference between the display areas with a threshold value one by one, and compensating the brightness of the display area when the calculated temperature difference between the display areas is larger than the threshold value. Otherwise, the brightness of the display area is not required to be compensated, and the display area keeps the current brightness to continue to operate.
In an embodiment, the obtained temperature difference between the maximum temperature value and the minimum temperature value of the current temperatures of the plurality of display areas may be calculated, and the maximum temperature difference between the plurality of display areas may be obtained by subtracting the minimum temperature value from the maximum temperature value of the current temperatures of the plurality of display areas. Judging whether the maximum temperature difference is larger than a threshold value, and compensating the display brightness of the display area when the calculated maximum temperature difference of the display area is larger than the threshold value.
In an embodiment, the average temperature of the plurality of display areas may be obtained by calculating the average value of the current temperatures of the plurality of display areas, respectively calculating the temperature difference between the current temperature and the average temperature of each display area, taking the average temperature of the plurality of display areas as a standard, when the temperature difference is greater than a threshold value, indicating that the current temperature and the average temperature of the display area have a larger difference, and compensating the brightness of the display area is required to make the display brightness of the plurality of display areas uniform.
In an embodiment, a temperature value may be preset according to the requirement in practical application, a difference between the current temperature of each display area and the preset temperature is calculated, and when the difference is greater than a certain threshold, the brightness of the display area is compensated, so that the display brightness of the display areas is the brightness corresponding to the preset temperature value. By way of example, tests have shown that when the temperature of the display screen is in the range of 40-60 ℃ for a long period of time, the luminescent material in the light emitting device will be consumed rapidly and the light emitting device will be damaged, and therefore, preferably, the preset temperature can be set to any value between 40-60 ℃.
The threshold and the preset temperature may be set by a manufacturer of the display device and stored in the display device, or may be user-defined according to actual needs, and the specific value is not limited herein.
Optionally, when the temperature difference between the display areas is greater than the threshold value, the method for compensating the display brightness of the display areas may be: the display brightness of the display areas is regulated and controlled by regulating and controlling the driving current and/or the light emitting time of the light emitting devices in the display areas, so that the display brightness of the display areas is uniform.
Referring to fig. 3, fig. 3 is a flow chart illustrating an embodiment of a method for adjusting brightness uniformity according to the present invention.
Step 201: the current temperatures of a plurality of display areas on the display device are acquired in a zoning mode.
Step 202: in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated.
Step 203: the attenuation amplitude of each light emitting device in the display area is obtained.
Since the light intensity of the light emitting devices of different colors in each display area is attenuated differently according to the temperature, the luminance of each display area composed of a plurality of light emitting devices is attenuated differently. In order to more accurately compensate the brightness of the display area, a curve of the luminous intensity of the display device along with the temperature change can be established.
In one embodiment, the relationship between the luminous intensity and the temperature of the display device is shown in fig. 2, and fig. 2 is a schematic diagram of the relationship between the temperature and the brightness of different light emitting devices in a display area according to the present invention. At a temperature of-40 ℃ to 80 ℃, the brightness of the red light emitting device (R) decays at a maximum speed with the rise of temperature, and the brightness of the green light emitting device (G) decays at a slower speed with the rise of temperature.
When the calculated temperature difference of the display areas is larger than the threshold value and the brightness of the display areas with the current temperature smaller than the initial temperature needs to be compensated, the current temperature of each display area is obtained, the temperature change value between the current temperature and the initial temperature is obtained according to the current temperature of each display area, and the attenuation amplitude can be obtained based on the corresponding relation between the temperature change value and the brightness attenuation rates of the light emitting devices with different colors.
In an embodiment, the attenuation amplitude may be obtained from a correspondence between the current temperature and the luminance attenuation rate of the light emitting device. Alternatively, the attenuation amplitude may be obtained based on the correspondence between the temperature change value and the current temperature and the luminance attenuation rate of the light emitting device.
Step 204: a compensation coefficient is generated based on the attenuation magnitude.
Specifically, compensation coefficients of the red, green and blue light emitting devices in each display area are obtained respectively. So as to facilitate the accurate compensation of the red, green and blue light emitting devices in each display area.
Optionally, a reference compensation value is obtained, the reference compensation value is the brightness to be compensated to what extent, and the driving current compensation coefficient of each light emitting device in each display area is generated according to the attenuation amplitude and the value to be compensated, so as to accurately compensate the red, green and blue light emitting devices in each display area.
The brightness corresponding to the average temperature may be used as a compensation reference, so that the brightness of the light emitting areas is the same as the brightness of the area where the average temperature is located. The average temperature of the plurality of display areas is obtained, the display brightness corresponding to the average temperature is taken as the reference brightness, the display brightness of the plurality of display areas is regulated and controlled to be the reference brightness, or the highest temperature, the lowest temperature or the brightness corresponding to the designated temperature is taken as the compensation reference, and the method is not limited herein. And obtaining the current brightness according to the attenuation amplitude, calculating the difference between the current brightness and the compensation reference brightness, and obtaining the compensation coefficient.
Step 205: the driving current of each light emitting device in the display region is regulated based on the compensation coefficient so that the regulated driving current=x+ the driving current before regulation. Where X is a compensation coefficient, the compensation coefficients of different light emitting devices may be the same or different.
After the compensation coefficient of each light emitting device in each display area is obtained, the driving current of each light emitting device in each display area is regulated according to the compensation coefficient, so that the regulated driving current=X+ is the driving current before regulation. The color difference problem caused by uneven temperature of the display area of the display screen part can be compensated by outputting the compensated driving current for each light emitting device of each display area.
For example, in a specific embodiment, taking a display area in a display screen as an example, when the display device does not start to operate, an initial driving current r=5ma of a red light emitting device, an initial driving current g=3ma of a green light emitting device, and an initial driving current b=3ma of a blue light emitting device in the display area are used for driving and displaying, a temperature difference threshold is set to 10 ℃, a luminance decay curve of the red light emitting device is 3 mill/°c, a luminance decay curve of the green light emitting device is 0.5 mill/°c, and a luminance decay curve of the blue light emitting device is 1 mill/°c.
After a certain time of operation, the current temperatures of a plurality of display areas on the display device are obtained by dividing the areas. Referring to fig. 4, fig. 4 is a schematic diagram showing the current temperatures of the display areas after the display device of the present invention is operated for a period of time. Based on the current temperature and the reference compensation value, the compensation coefficient is obtained, and the driving current is re-issued for each display area as R X, G Y and B Z, wherein X/Y/Z are the compensation coefficients of the current of the red light emitting device/the current of the green light emitting device/the current of the blue light emitting device respectively. By acquiring the driving current compensation coefficient of each light emitting device in each display area, the driving current of each light emitting device in each display area is regulated and controlled according to the driving current compensation coefficient, and the brightness compensation of each light emitting device in each display area is realized in a targeted manner. After compensation, the display brightness of the display areas at different temperatures and the display brightness of the light emitting devices with different colors are basically consistent, so that the consistency of the display brightness of a plurality of display areas in the display screen is improved. After a period of compensation and dynamic adjustment, the temperature difference between different display areas in the display screen is basically kept stable, and the driving currents of the plurality of display areas and the light emitting devices with different colors are also kept constant.
In an implementation manner, the display brightness of the display area can be regulated by regulating the driving voltage of the light emitting device in the display area, and the principle of regulating the display brightness of the display area through the driving voltage is consistent with that of regulating the display brightness of the display area through regulating the driving current of the light emitting device in the display area.
In the embodiment, the temperatures of a plurality of display areas are obtained by dividing the areas, the display difference of the display areas is obtained by utilizing the temperature difference, so that the display brightness is compensated, and different current compensation coefficients are set according to the attenuation amplitude values of the light emitting devices with different colors in a targeted manner to compensate the brightness of each light emitting device in the display area, so that the brightness of the display area is compensated in a fine and controllable manner. Compared with a method for making the temperature of the display screen uniform in a physical mode, the method provided by the invention has the advantages that under the condition of uneven temperature, the software current compensation is carried out according to the luminous characteristics of the luminous devices with different colors, the display device is used for directly controlling, and the compensated driving current is output for the three luminous devices with red, green and blue colors of each display area. The method has the advantages that the operation on hardware is flexible and simple, the brightness compensation effect is good, the good adjusting effect can be realized when the consistency difference is relatively large, and meanwhile, the appearance and the structure of the display screen are not influenced.
Referring to fig. 5, fig. 5 is a flow chart illustrating another embodiment of a method for adjusting brightness uniformity according to the present invention.
Step 301: the current temperatures of a plurality of display areas on the display device are acquired in a zoning mode.
Step 302: in response to the temperature difference between two or more display regions being greater than a threshold, display brightness of the display regions is compensated.
Step 303: the attenuation amplitude of each light emitting device in the display area is obtained.
Step 304: a compensation coefficient is generated based on the attenuation magnitude.
Step 305: the light emission time length of each light emitting device in the display region is regulated based on the compensation coefficient, so that the regulated light emission time length=x+ the light emission time length before regulation.
Alternatively, the display brightness of the display region can be regulated by regulating the light emitting duration of the light emitting device in the display region. The light emitting time of each light emitting device in the display area is regulated according to the compensation coefficient, so that the regulated light emitting time=X+ light emitting time before regulation. The color difference problem caused by uneven temperature of the display screen can be compensated by outputting the compensated luminous duration aiming at the red, green and blue luminous devices of each display area. Where X is a compensation coefficient, the compensation coefficients of different light emitting devices may be the same or different.
In the embodiment, the refresh time (i.e. the light emitting duration) is changed under the condition of fixed refresh frequency, and the refresh frequency is the physical refresh time of the display screen, specifically, the number of repeated scanning of the pattern. The display device obtains the current temperatures of the plurality of display area temperature sensors to generate a luminous duration compensation coefficient alpha for each of the three-color luminous devices of red, green and blue, and the luminous duration compensation coefficient alpha is overlapped with the original single luminous duration T1 of each of the three-color luminous devices of red, green and blue to generate a new single luminous duration T1 alpha. The display device controls the three red, green and blue light emitting devices of each display area to emit light with a certain refresh frequency and with a new single light emitting duration T1. Alpha. So as to compensate the color difference caused by the uneven temperature of the display area of the display screen. Thereby making the brightness of the light emitting devices of different colors uniform.
Note that in this embodiment mode, the display device dynamically adjusts the light emission periods of the three color light emitting devices of red, green, and blue with a constant driving current and a constant driving voltage.
In a specific embodiment, taking a display area in a display screen as an example, when the display device does not start to operate, a red light emitting device driving current r=5ma, a single light emitting duration is T1, a green light emitting device driving current g=3ma, a single light emitting duration is T2, a blue light emitting device driving current b=3ma, a single light emitting duration is T3, and the LED lamp beads are driven to display, a temperature difference threshold is set to 10 ℃, a luminance decay curve of the red light emitting device is 3 mill/°c, a luminance decay curve of the green light emitting device is 0.5 mill/°c, and a luminance decay curve of the blue light emitting device is 1 mill/°c.
After a certain time of operation, the current temperatures of a plurality of display areas on the display device are obtained by dividing the areas. The current temperature of each display area is shown in fig. 4, and the light emitting duration of the red light emitting device, the green light emitting device and the blue light emitting device is respectively T1 alpha, T2 beta and T3 gamma according to the difference of the temperature rise of each display area, wherein alpha/beta/gamma is respectively the light emitting duration compensation coefficient of the red light emitting device, the green light emitting device and the blue light emitting device. The luminous time length compensation coefficient of each luminous device in each display area is obtained, and the single luminous time length of each luminous device in each display area is regulated and controlled according to the luminous time length compensation coefficient, so that the targeted brightness compensation of each luminous device in each display area is realized, after a period of compensation and dynamic adjustment, the temperature difference of different display areas in the display screen is basically kept stable, and the luminous time lengths of a plurality of display areas and luminous devices with different colors are kept constant.
In one embodiment, when the display luminance of one or more display regions is lower than that of the other display regions, the driving current and/or the light emission period of the light emitting device in the display region having the lower luminance is increased.
In the embodiment of the invention, the current temperatures of a plurality of display areas of the display equipment are obtained, the temperature difference between the display areas is calculated, and the display brightness of the display areas is regulated and controlled by regulating and controlling the driving current, the driving voltage and the light emitting duration of the light emitting device. In practical application, the actual temperature and the actual display brightness value of the light emitting device have influence on the brightness attenuation of the light emitting device in the display area of the display device, and in another feasible implementation, the brightness of the display device can be more comprehensively compensated by regulating and controlling any two or three of the driving current, the driving voltage and the light emitting duration of the light emitting devices with different colors, thereby comprehensively considering a plurality of factors influencing the brightness attenuation.
Through dividing the display area of the display screen, and being provided with a temperature sensor in each block, when the whole display screen module presents color non-uniformity, corresponding temperature difference can be reflected to the temperature sensor of each display area, and the display equipment generates the luminous duration compensation coefficient in unit time of the red, green and blue three-color luminous devices aiming at each display area by reading the temperature values of a plurality of display area temperature sensors, and the luminous duration compensation coefficient is overlapped with the luminous duration of the original luminous devices to generate new luminous duration of the luminous devices. And then the display equipment pertinently adjusts and controls the luminous time length of the luminous devices of the three colors of red, green and blue of each display area under the condition of changing the refresh frequency to make up for the display brightness consistency difference of the display screen. This way the adjustment accuracy will be higher and the brightness compensation smoother compared to the color difference caused by the current compensation temperature.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a display device according to the present invention. The method for regulating and controlling the uniformity of the display brightness is applied to the display equipment. As shown, the inventive display device at least includes a display unit 510, a controller 520, and a temperature sensor 530.
Specifically, the display device is provided with a display screen, that is, a display unit 510, the display unit 510 includes a plurality of display areas, each of which is provided with a temperature sensor 530, and the display unit 510 includes a driving chip and a light emitting device.
The display unit 510 may be used to display information input by a user or information provided to the user. The temperature sensor 530 may be used to detect temperatures of light emitting devices of different colors in a plurality of display areas, such as red, green, and blue light emitting devices in each display area. The controller 520 is a control center of the display device, connects various parts of the entire display device using various interfaces and lines, and performs various functions by running or executing software programs and/or modules stored in a memory, and calling data such as a luminance decay versus temperature curve of the light emitting device stored in the memory, to implement the above-described method of controlling display luminance uniformity.
Illustratively, taking an LED display screen as an example, the LED display unit includes an LED driving chip and an LED light emitting device. The LED driving chip is provided with an integrated circuit, and the integrated circuit is connected with the LED light emitting device corresponding to the display area and drives the LED light emitting device to emit light. The controller 520 is connected to the LED driving chip and the temperature sensor 530, respectively. The temperature sensor 530 collects the current temperature of the display area and feeds back to the controller 520. After the controller 520 obtains the current temperature collected by the temperature sensor 530, it determines that the temperature difference between the display areas is greater than a threshold, that is, determines whether the display areas and the display brightness of the display areas need to be compensated. The driving current and/or the light emitting duration of the light emitting devices in the display area are regulated so as to compensate the intensity attenuation difference of the LED light emitting devices with different colors caused by the temperature difference, and further the display brightness of the display area is regulated, so that the display brightness consistency of the LED display screen is improved.
The controller 520 may be a central first processing unit (Central Processing Unit, CPU), among other things, the controller 520 may also be other general purpose controllers, digital signal controllers (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose controller may be a microprocessor or the controller may be any conventional processor or the like.
In an embodiment, the display device provided by the invention further includes a memory. The memory is used for storing a relation curve of brightness decay and temperature of the light emitting device, and is matched with the display unit 510, the controller 520 and the temperature sensor 530 to implement the method for regulating and controlling the uniformity of the display brightness in any of the above embodiments. The memory also includes at least one computer program running on the controller 520, which when executed by the controller 520 performs the steps of any of the various embodiments of the method for controlling display brightness uniformity described above.
The memory may be a Smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), or the like. Further, the memory may also include both internal storage units and external storage devices. The memory is used to store an operating system, application programs, boot loader (BootLoader), data, and other programs, etc., such as program code for a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.
The embodiments of the present application also provide a computer readable storage medium storing a computer program, where the computer program when executed by a processor implements steps of the foregoing method embodiments.
The present embodiments provide a computer program product which, when run on a terminal device, causes the terminal device to perform steps that enable the respective method embodiments described above to be implemented.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the flow in the methods of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program may implement the steps of the above embodiments of the methods when executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a terminal device, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (10)
1. A method for controlling uniformity of display brightness, the method comprising:
obtaining the current temperatures of a plurality of display areas on the display device in a regional mode;
and compensating the display brightness of the display areas in response to the temperature difference between two or more display areas being greater than a threshold value, so that the display brightness of the plurality of display areas is uniform.
2. The method for adjusting and controlling uniformity of display brightness according to claim 1, wherein said compensating for display brightness of said display area comprises:
and regulating and controlling the driving current and/or the light emitting duration of the light emitting device in the display area so as to regulate and control the display brightness of the display area.
3. The method for adjusting and controlling uniformity of display brightness according to claim 2, wherein said compensating for display brightness of said display area comprises:
acquiring attenuation amplitude values of the light emitting devices in the display area;
generating a compensation coefficient based on the attenuation amplitude;
and regulating the driving current and/or the light emitting duration of each light emitting device in the display area based on the compensation coefficient, so that the regulated driving current and/or light emitting duration=x+ the driving current and/or light emitting duration before regulation, wherein X is the compensation coefficient, and the compensation coefficients of different light emitting devices are the same or different.
4. The method for controlling uniformity of display luminance according to claim 3, wherein said obtaining an attenuation magnitude of each of said light emitting devices in said display area comprises:
acquiring a temperature change value between the current temperature and the initial temperature of the display area;
and obtaining the attenuation amplitude based on the corresponding relation between the temperature change value and/or the current temperature and the brightness attenuation rate of the light-emitting device.
5. The method for adjusting and controlling uniformity of display brightness according to claim 3, wherein said compensating display brightness of the display area comprises:
and increasing the driving current and/or the light emitting duration of the light emitting device in the display area with low brightness in response to the display brightness of the display area being lower than that of other display areas.
6. The method for controlling the uniformity of display luminance according to claim 1, wherein the method comprises:
subtracting the minimum temperature value from the maximum temperature value of the display areas to obtain the maximum temperature difference of the display areas;
judging whether the maximum temperature difference is larger than a threshold value or not;
and compensating the display brightness of the display area in response to the maximum temperature difference being greater than a threshold value.
7. The method for controlling the uniformity of display luminance according to claim 1, wherein the method comprises:
acquiring average temperatures of the display areas;
and taking the display brightness corresponding to the average temperature as reference brightness to regulate and control the display brightness of the display areas to be the reference brightness.
8. A display device, the display device comprising: a display unit, a controller and a temperature sensor, wherein,
the temperature sensor is used for acquiring the current temperatures of a plurality of display areas of the display unit;
the controller is configured to execute instructions to implement the method for controlling display luminance uniformity according to any one of claims 1 to 7.
9. The display device according to claim 8, further comprising a memory for storing a luminance decay versus temperature curve of the light emitting device.
10. A computer-readable storage medium storing instructions/program data executable to implement the method of regulating display luminance uniformity according to any one of claims 1 to 7.
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| CN202310350290.1A CN116469339A (en) | 2023-03-28 | 2023-03-28 | Display brightness uniformity regulating and controlling method, display equipment and storage medium |
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