CN110136622B - Display panel, display device, and display data processing method and device - Google Patents
Display panel, display device, and display data processing method and device Download PDFInfo
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- CN110136622B CN110136622B CN201810107024.5A CN201810107024A CN110136622B CN 110136622 B CN110136622 B CN 110136622B CN 201810107024 A CN201810107024 A CN 201810107024A CN 110136622 B CN110136622 B CN 110136622B
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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
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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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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention discloses a display panel, a display device, a display data processing method and a display data processing device. The display panel comprises a driving IC positioned in a frame area, and a temperature sensor and at least two thermocouples which are respectively and electrically connected with the driving IC; the first hot electrode and the second hot electrode of the thermocouple are electrically connected to form a cold junction and a hot junction; the cold junction is positioned in the frame area far away from the drive IC, the hot junction is positioned at the drive IC, and the temperature sensor is positioned at the hot junction and used for detecting a first temperature at the hot junction; the driving IC is used for determining a second temperature at the cold junction according to the thermal electromotive force generated by the thermocouple and the first temperature, determining the temperature distribution of the display panel according to the first temperature and the second temperature, and performing data compensation on input display data according to the temperature distribution. The invention solves the problem of uneven display brightness caused by uneven temperature distribution of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a display device, a display data processing method and a display data processing device.
Background
In response to the development of the information society, demands for various types of display devices displaying images are increasing. In recent years, a series of display devices such as a Liquid Crystal Display (LCD) device, a Plasma Display Panel (PDP), and an organic light emitting display device have been used.
In general, a display device includes a display area and a non-display area (a frame area), the frame area is provided with a driving IC, temperature distribution on the display device from a position close to the driving IC to a position far away from the driving IC is uneven due to heat emitted by the driving IC, and luminance of pixels has temperature dependency, that is, luminance of pixels changes due to temperature influence, which further causes uneven display luminance of a display panel, and even further deteriorates unevenness of display luminance, which is more serious in a larger display device (such as a notebook computer).
Disclosure of Invention
In view of the above, the present invention provides a display panel, a display device, a method and a device for processing display data, so as to solve the problem of non-uniform display brightness caused by non-uniform temperature distribution of the display panel.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a display panel, including a display area, a frame area surrounding the display area, a driving IC located in the frame area, and a temperature sensor and at least two thermocouples electrically connected to the driving IC respectively;
the thermocouple comprises a first hot electrode and a second hot electrode, wherein the first end of the first hot electrode is electrically connected with the first end of the second hot electrode to form a cold junction, and the second end of the first hot electrode and the second end of the second hot electrode are respectively electrically connected with the driving IC to form a hot junction;
the cold junction is located in the frame area far away from the driving IC, the hot junction is located at the driving IC, the temperature sensor is located at the hot junction, and the temperature sensor is used for detecting a first temperature at the hot junction;
the driving IC is used for determining a second temperature at the cold junction according to the thermal electromotive force generated by the thermocouple and the first temperature, determining the temperature distribution of the display panel according to the first temperature and the second temperature, and compensating the input display data according to the temperature distribution so as to display an image with uniform brightness.
In a second aspect, an embodiment of the present invention provides a display device, including the display panel provided in the embodiment of the present invention.
In a third aspect, an embodiment of the present invention provides a method for processing display data, including:
acquiring thermoelectromotive force generated by at least two thermocouples on a display panel respectively and a first temperature at a hot junction of the thermocouples, wherein the hot junction is positioned at a drive IC in a frame area of the display panel;
determining a second temperature at a cold junction of the thermocouple from the thermal electromotive force and the first temperature, wherein the cold junction is located within the bezel area remote from the driver IC;
determining the temperature of any point on the display panel by adopting a boundary element method according to the first temperature and the second temperature;
generating a gray scale adjustment value associated with the display lookup table according to the temperature of any point on the display panel and the display lookup table;
and compensating the input display data of any point on the display panel according to the gray scale adjustment value.
In a fourth aspect, an embodiment of the present invention further provides a device for processing display data, which is disposed in a driver IC of a display panel, and includes:
the display panel comprises a thermal electromotive force and temperature acquisition module, a driving IC and a display panel frame area, wherein the thermal electromotive force and temperature acquisition module is used for acquiring thermal electromotive forces generated by at least two thermocouples on the display panel respectively and a first temperature at a hot junction of the thermocouples, and the hot junction is positioned at the driving IC in the display panel frame area;
a second temperature determination module for determining a second temperature at a cold junction of the thermocouple according to the thermal electromotive force and the first temperature, wherein the cold junction is located in the bezel area away from the driver IC;
the temperature estimation module is used for determining the temperature of any point on the display panel by adopting a boundary element method according to the first temperature and the second temperature;
the gray adjustment value generating module is used for generating a gray adjustment value associated with the display lookup table according to the temperature of any point on the display panel and the display lookup table;
and the data compensation module is used for compensating the input display data of any point on the display panel according to the gray scale adjustment value.
The beneficial effects of the invention are: according to the display panel, the display device and the processing method and device of display data, the thermocouple is integrated into the display panel, the hot junction of the thermocouple is specifically arranged at the position of the drive IC and is electrically connected with the drive IC, and the generated thermal electromotive force is transmitted to the drive IC; providing a temperature sensor electrically connected to the driving IC at the hot junction to transmit the measured temperature at the hot junction to the driving IC; the cold junction of the thermocouple is arranged in the frame area far away from the drive IC, so that the temperature of any point in the frame area far away from the drive IC can be indirectly and accurately measured, and the cost is low; meanwhile, with the above-described structure of the present invention, the driving IC may determine the temperature distribution of the display panel according to the first temperature at the hot junction and the second temperature at the cold junction, and compensate the input display data according to the temperature distribution and the associated display lookup table, thereby solving the problem of non-uniform display brightness due to non-uniform temperature distribution of the display panel.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:
FIG. 1 is a schematic diagram of temperature distribution on a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a partial plan structure of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a display panel at a cold junction of a thermocouple according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a display panel at a thermal junction of a thermocouple according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating an estimation of any point on a display panel according to an embodiment of the present invention;
FIG. 6 is an equivalent diagram of estimating any point on the display panel according to the embodiment of the invention;
FIG. 7 is a schematic diagram of a thermopile according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view illustrating a pixel unit in a display panel according to an embodiment of the invention;
FIG. 9 is a schematic structural diagram of a temperature difference-voltage testing system provided in an embodiment of the present invention;
FIG. 10 is a graph of the temperature difference between a hot junction and a cold junction as a function of output voltage, as provided by an embodiment of the present invention;
FIG. 11 is a flowchart illustrating a method for processing display data according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of temperature measurement points provided by an embodiment of the present invention;
fig. 13 is a block diagram of a display data processing apparatus according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of temperature distribution on a display panel according to an embodiment of the present invention. As shown in fig. 1, the display panel includes a display area 100 and a frame area 200 surrounding the display area 100, and at least one driving IC1 is disposed in the frame area 200. The driving IC1 continuously emits heat and diffuses toward the display region when operating, and the temperature on the display panel gradually decreases with increasing distance from the driving IC1, such as the temperature of the region a, the region B, the region C and the region D shown in fig. 1 gradually decreases, the temperature of the region a closest to the driving IC1 is the largest, and the temperature of the region D farthest from the driving IC1 is the smallest. Therefore, when the display panel displays images, the temperature distribution of each area on the display panel is not uniform, and the luminance of the pixels has temperature dependency, that is, the luminance of the pixels changes due to the temperature, which causes the display panel to display uneven luminance. Therefore, embodiments of the present invention provide a display panel to solve the above problems.
Fig. 2 is a schematic view of a partial plan structure of a display panel according to an embodiment of the present invention; FIG. 3 is a schematic cross-sectional view of a display panel at a cold junction of a thermocouple according to an embodiment of the present invention; fig. 4 is a schematic cross-sectional view of a display panel at a thermal junction of a thermocouple according to an embodiment of the present invention. Referring to fig. 2, 3 and 4 together, the present embodiment provides a display panel including a display area 100 and a bezel area 200 surrounding the display area 100, further including a driving IC1 located in the bezel area 200, and a temperature sensor 3 (see fig. 4) and at least two thermocouples 2 electrically connected to the driving IC1, respectively;
the thermocouple 2 comprises a first thermode 21 and a second thermode 22, wherein a first end of the first thermode 21 is electrically connected with a first end 22 of the second thermode to form a cold junction 202, and a second end of the first thermode 21 and a second end of the second thermode 22 are respectively electrically connected with the driving IC1 to form a hot junction 201;
the cold junction 202 is located in the bezel area 200 away from the driver IC1, the hot junction 201 is located at the driver IC1, the temperature sensor 3 is located at the hot junction 201, and the temperature sensor 3 is used for detecting a first temperature at the hot junction 201;
the driving IC1 is configured to determine a second temperature at the cold junction 202 based on the thermal electromotive force generated by the thermocouple 2 and the first temperature, determine a temperature distribution of the display panel based on the first temperature and the second temperature, and compensate the input display data based on the temperature distribution to display an image with uniform brightness.
The first hot electrode 21 and the second hot electrode 22 of the thermocouple 2 form a loop with the driving IC, and the first hot electrode 21 and the second hot electrode 22 are made of different conductor or semiconductor materials. When the temperatures at hot junction 201 and cold junction 202 are different, an electromotive force is generated in the circuit, the direction and magnitude of the electromotive force are related to the materials of first hot electrode 21 and second hot electrode 22 and the temperatures of hot junction 201 and cold junction 202, and are not related to the shape and size of the thermocouple, and this phenomenon is called "thermoelectric effect", and the generated electromotive force is called "thermoelectric electromotive force". Therefore, when the materials of the two hot and cold electrodes of the thermocouple are fixed, the thermal electromotive force is a function of the temperature difference between the hot junction 201 and the cold junction 202. Therefore, in the embodiment, the driving IC1 can indirectly measure the second temperature at the cold junction 202 according to the thermal electromotive force generated by the thermocouple 2 and the first temperature at the hot junction 201, and then the temperature of the measurement point required in the frame area 200 far from the driving IC1 can be obtained by only arranging one temperature sensor at the hot junction 201, so that the temperature sensor is saved, and the cost of the temperature sensor is reduced.
Alternatively, since the temperature at the hot junction 201 of the thermocouple 2 is the temperature of the driving IC, the temperature sensor 3 may be integrated in the driving IC, improving the accuracy of temperature measurement.
In the above scheme, referring to fig. 3 and 4, the display panel may include a substrate 10 and a packaging layer 12, the thermocouple 2 is disposed on one side of the substrate 10, the substrate 10 and the packaging layer 12 are attached to each other through a frame sealing adhesive 11 located in the frame region 200, and the second end of the first hot electrode 21 and the second end of the second hot electrode 22 are electrically connected to the driving IC1 through an anisotropic conductive adhesive 13, respectively.
Optionally, two ends of the driving IC are respectively provided with a thermocouple, and the driving IC is configured to determine the temperature of any point on the display panel according to the two first temperatures and the two second temperatures of the two thermocouples.
For example, as shown in fig. 5, the temperature at the hot junction of one thermocouple is Th1, the temperature at the cold junction is Tc1, the temperature at the hot junction of the other thermocouple is Th2, the temperature at the cold junction is Tc2, any point on the display panel is a P point, and the temperature of the P point can be calculated by using a boundary element method. For example, referring to fig. 6, one can obtain:
e h1 +e h2 +e c1 +e c2 +e a ＝0； (6)
the temperature at the point P obtained from formula (1), formula (2), formula (3), formula (4), formula (5) and formula (6) is:
wherein e is h1 And e h2 Represents the thermal energy flow from the hot junction to the point P (thermal energy flow); e.g. of the type c1 And e c2 Represents the flow of thermal energy from the cold junction to point P; r represents the thermal resistance between the hot junction and the cold junction and the point P respectively; ta represents normal temperature (e.g., 25 ℃); r represents the thermal resistance between point P and air; e.g. of the type a Representing the flow of thermal energy from the air to point P. Wherein R and R can be obtained by conventional means such as thermal simulation or measurement.
Therefore, after the temperatures of a plurality of discrete measuring points in the frame area are measured, the temperature of any point in the display panel can be calculated by adopting a boundary element method.
Based on the structure of the display panel, the driver IC1 in the embodiment of the invention can perform temperature-dependent brightness compensation on the input display data according to the temperature distribution after determining the temperature distribution of the display panel according to the first temperature and the second temperature and by using the boundary element method, so as to improve the uniformity of the display brightness of the display panel.
For example, the driving IC may generate compensation data associated with temperature according to a pre-stored display look-up table, and optionally, may generate a gray scale adjustment value associated with temperature through the display look-up table, and after the driving IC receives the display data, the driving IC generates new display data according to the temperature at each pixel point and the associated gray scale adjustment value, and drives each pixel to perform image display.
In the display panel provided by the embodiment, the thermocouple is integrated into the display panel, and particularly, the hot junction of the thermocouple is arranged at the driving IC and is electrically connected with the driving IC, so that the generated thermal electromotive force is transmitted to the driving IC; providing a temperature sensor electrically connected to the driving IC at the hot junction to transmit the measured temperature at the hot junction to the driving IC; the cold junction of the thermocouple is arranged in the frame area far away from the drive IC, so that the temperature of any point in the frame area far away from the drive IC can be indirectly and accurately measured, and the cost is low; meanwhile, with the above-described structure of the present invention, the driving IC may determine the temperature distribution of the display panel according to the first temperature at the hot junction and the second temperature at the cold junction, and compensate the input display data according to the temperature distribution and the associated display lookup table, thereby solving the problem of non-uniform display brightness due to non-uniform temperature distribution of the display panel.
Optionally, the display panel includes a plurality of thermocouples, the plurality of thermocouples are stacked end to form a thermoelectric stack, and the joints form a plurality of hot junctions and a plurality of cold junctions.
Illustratively, as shown in fig. 7, a plurality of thermocouples are stacked end to form a thermopile 23, and the junction forms a plurality of hot junctions 201 and a plurality of cold junctions 202. Wherein, the magnitude of the thermoelectromotive force generated by each thermocouple is as follows:
V＝(Sb-Sa)*(T2-T1)；
wherein Sb represents the seebeck coefficient of the second thermode; sa represents the seebeck coefficient of the first thermode; t2 represents the temperature at the hot junction; t1 represents the temperature at the cold junction. Wherein the seebeck coefficient is determined by the material of the thermode.
In this embodiment, the plurality of thermocouples are stacked end to form the thermopile 23, and the thermoelectromotive force generated by the thermopile 23 is also the stack of the thermoelectromotive forces generated by the plurality of thermocouples, so the thermoelectromotive force of the thermopile formed by the n thermocouples is:
V＝n(Sb-Sa)*(T2-T1)；
therefore, the value of the thermal electromotive force detected by the driving IC can be multiplied, the signal to noise ratio is improved, and the detected temperature at the cold junction is more accurate.
Optionally, referring to fig. 7, the complementary amplifier 4 may be electrically connected to the thermal electromotive force output end of the hot junction, and the amplified thermal electromotive force is output to the driving IC through the digital-to-analog converter for calculation, so as to further improve the accuracy of detecting the temperature at the cold junction.
Optionally, the first hot electrode and the second hot electrode of the thermocouple in the above embodiment may be prepared by the same process as part of the film layer on the display panel, so as to save the process flow and reduce the cost.
For example, fig. 8 is a schematic cross-sectional structure diagram of a pixel unit in a display panel according to an embodiment of the present invention. As shown in fig. 8, the display region includes a plurality of pixel units defined by intersections of a plurality of gate lines and a plurality of data lines (not shown), the pixel units including thin film transistors 15 and an anode electrode 16 and a cathode electrode 17 on one side of the thin film transistors 15; the thin film transistor 15 includes a polysilicon active layer 151, a gate electrode 152, a source electrode 153 and a drain electrode 154, the source electrode 153 and the drain electrode 154 being electrically connected to the polysilicon active layer 151, the gate electrode 152 being electrically connected to the gate line, the source electrode 153 being electrically connected to the data line, the drain electrode 154 being electrically connected to the anode electrode 16; the gate line and the gate electrode 152 are fabricated by the same process, and the data line and the source electrode 153 or the drain electrode 154 are fabricated by the same process.
In this embodiment, the first hot electrode and the anode 16 are fabricated by the same process, and the second hot electrode and the data line (source electrode 153), the gate line (gate electrode 152) or the polysilicon active layer 151 are fabricated by the same process; alternatively, the first hot electrode and the data line (source electrode 153) are fabricated by the same process, and the second hot electrode and the gate line (gate electrode 152) or the polysilicon active layer 151 are fabricated by the same process.
It should be noted that the pixel unit according to the embodiment of the present invention is not limited to the above structure, as long as the thermocouple and some of the conductive film layers in the display panel can be prepared by the same process.
Optionally, the thermocouple comprises a PN junction structure, and the cold junction is located at the PN junction. Illustratively, a first hot electrode and a second hot electrode of the thermocouple are both prepared on the same layer with the polycrystalline silicon active layer, the first hot electrode is doped with P-type ions, the second hot electrode is doped with N-type ions, and the cold junction is positioned at the junction of the P-channel and the N-channel.
Tests show that when the thermocouple comprises a PN junction structure, the thermoelectromotive force generated by the thermocouple changes most when the temperature difference between a hot junction and a cold junction changes by 1 ℃. Therefore, when the thermocouple with the PN junction structure is used for temperature detection, the accuracy of temperature detection can be improved, and the temperature or the generated thermoelectromotive force is hardly influenced by visible light, ultraviolet rays and infrared rays.
Specifically, fig. 9 is a schematic structural diagram of the temperature difference-voltage testing system according to the embodiment of the present invention. As shown in fig. 9, the temperature difference-voltage testing system includes a testing board, a first temperature sensor Ta, a second temperature sensor Tb, a heater power supply, a voltmeter V and an ammeter a, wherein the testing board includes a glass substrate, a heater 20 and a thermopile on the glass substrate, a hot junction 201 of the thermopile is located on the heater 20, a cold junction 202 of the thermopile is located on both sides of the heater 20, the heater 20 may be indium tin oxide, both ends of the heater 20 are electrically connected to the heater power supply, the current output by the heater power supply is adjustable, and the magnitude of the current output by the heater power supply to the heater 20 is observed through the ammeter a, so as to control the temperature of the heater 20; the voltmeter V is electrically connected to the ports of the cold junction 202 on both sides of the heater 20, and is configured to detect the thermal electromotive force generated by the thermopile, the first temperature sensor Ta is configured to measure the temperature of the cold junction 202, the second temperature sensor Tb is configured to measure the temperature of the hot junction 201, and the first temperature sensor Ta and the second temperature sensor Tb may be non-contact temperature sensors. For example, the thermopile to be tested in this embodiment may be formed by stacking 100 thermocouples, and the thermopile formed by the thermocouples of three structures, that is, the thermopile is formed by stacking the thermocouples that are respectively prepared by the same process for the first thermode (made of indium tin oxide) and the anode and the same process for the second thermode (made of titanium) and the data line, the thermocouples that are prepared by the same process for the first thermode (made of titanium) and the data line and the same process for the second thermode (made of aluminum) and the gate line, and the thermocouple that is formed by the thermocouple of the PN junction structure (made of silicon). Referring to fig. 10, it can be seen from fig. 10 that when the first hot electrode and the data line of the thermocouple are fabricated by the same process and the second hot electrode and the gate line are fabricated by the same process, the variation of the thermoelectric potential of the thermopile is 0.46 mV/deg.c; when the first thermode and the anode of the thermocouple are prepared by the same process, and the second thermode and the data line are prepared by the same process, the variation of the thermoelectromotive force of the thermopile is 0.72 mV/DEG C; when the thermocouple includes a PN junction structure, the variation of the thermoelectromotive force of the thermopile is 5.68 mV/deg.C. It can be seen that the amount of change in the thermoelectromotive force of a single thermocouple is the greatest when the thermocouple includes a PN junction structure.
The thermocouple composed of the PN junction structure provided by the embodiment generates the maximum thermoelectromotive force along with the variation of the temperature difference between the hot junction and the cold junction, and can improve the accuracy of temperature detection.
The embodiment of the invention also provides a display device which comprises the display panel provided by any one of the embodiments. The display device may be a mobile phone, a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment.
In addition, the embodiment of the invention also provides a display data processing method, which is suitable for the condition of performing temperature-dependent brightness compensation on the display data. The method may be performed by a processing device of the display data, which may be provided in the driver IC and may be implemented by software and/or hardware. Fig. 11 is a flowchart illustrating a method for processing display data according to an embodiment of the present invention. As shown in fig. 11, the method for processing display data includes:
Wherein, the hot junction is located at the drive IC in the frame area of the display panel; the thermocouple comprises a first thermode and a second thermode, wherein the first end of the first thermode is electrically connected with the first end of the second thermode to form a cold junction, and the second end of the first thermode and the second end of the second thermode are respectively electrically connected with the driving IC to form a hot junction; the first hot electrode and the second hot electrode of the thermocouple and the driving IC form a loop, the first hot electrode and the second hot electrode are made of different conductor or semiconductor materials, when the temperatures of the hot junction and the cold junction are different, a thermal electromotive force is generated in the loop, and the driving IC can detect the thermal electromotive force. In addition, a temperature sensor electrically connected to the driving IC may be provided at the thermal junction, the temperature sensor transmitting the detected first temperature at the thermal junction to the driving IC.
A second temperature at the cold junction of the thermocouple is determined based on the thermal electromotive force and the first temperature, step 120.
Wherein, the cold junction is located in the frame area far away from the drive IC; since the direction and magnitude of the thermal electromotive force are related to the materials of the first and second hot electrodes and the temperatures of the hot junction and the cold junction, but are not related to the shape and size of the thermocouple, when the materials of the two hot electrodes of the thermocouple are fixed, the thermal electromotive force is the function difference of the temperatures of the hot junction and the cold junction, and similarly, the second temperature of the cold junction of the thermocouple can be determined according to the thermal electromotive force and the first temperature.
And step 130, determining the temperature of any point on the display panel by adopting a boundary element method according to the first temperature and the second temperature.
Specifically, the temperatures of a plurality of measurement points at a plurality of hot junctions and a plurality of cold junctions in the frame area of the display panel can be obtained, and the temperature interpolation of any point on the display panel is generated by adopting an interpolation algorithm according to the temperatures of the plurality of measurement points. For example, as shown in fig. 12, the temperatures of 12 measurement points 300 in the frame area of the display panel are obtained, and at this time, a cold junction may be provided at each measurement point 300, and the temperatures of the 12 measurement points 300 are calculated according to the relationship between the temperatures of the hot junction and the cold junction of the thermocouple and the thermal electromotive force generated by the thermocouple; then, the temperature interpolation of any point on the display panel is estimated by using the existing interpolation algorithm (such as the nearest neighbor interpolation method and the bilinear quadratic interpolation method) according to the temperatures of the 12 measurement points 300. The results show that the maximum temperature error for the temperature distribution estimated using the boundary element method is less than 3 deg.c compared to the reference temperature distribution. Therefore, a more accurate temperature distribution on the display panel can be obtained by using the boundary element method.
Wherein, the display lookup table indicates the corresponding relationship between the temperature and the gray scale adjustment value, and one gray scale adjustment value is correspondingly output when one temperature is input.
And 150, compensating the input display data of any point on the display panel according to the gray scale adjustment value.
After receiving the display data, new display data is generated according to the temperature at each pixel point and the associated gray scale adjustment value, and each pixel is driven to display an image with uniform brightness.
The processing method of the display data provided by the embodiment can determine the temperature distribution of the display panel according to the first temperature at the hot junction and the second temperature at the cold junction, and compensate the input display data according to the temperature distribution and the associated display lookup table, thereby solving the problem of uneven display brightness caused by uneven temperature distribution of the display panel.
Accordingly, an embodiment of the present invention further provides a device for processing display data, where the device for processing display data can be disposed in a driver IC of a display panel, and fig. 13 is a block diagram of the device for processing display data provided by the embodiment of the present invention, and as shown in fig. 13, the device for processing display data includes:
a thermal electromotive force and temperature obtaining module 31, configured to obtain a thermal electromotive force generated by at least two thermocouples on the display panel and a first temperature at a hot junction of the thermocouples, where the hot junction is located at a driving IC in a frame area of the display panel;
a second temperature determination module 32, configured to determine a second temperature at a cold junction of the thermocouple according to the thermal electromotive force and the first temperature, where the cold junction is located in a frame region away from the driver IC;
the temperature estimation module 33 is configured to determine the temperature of any point on the display panel by using a boundary element method according to the first temperature and the second temperature;
a gray-scale adjustment value generating module 34, configured to generate a gray-scale adjustment value associated with the display lookup table according to the temperature of any point on the display panel and the display lookup table;
and the data compensation module 35 is configured to compensate the input display data at any point on the display panel according to the gray-scale adjustment value.
Optionally, the temperature estimation module includes:
a multi-point temperature acquisition unit for acquiring temperatures of a plurality of measurement points at a plurality of hot junctions and a plurality of cold junctions within a frame area of the display panel;
and the temperature interpolation generating unit is used for generating the temperature interpolation of any point on the display panel by adopting an interpolation algorithm according to the temperatures of the plurality of measuring points.
The display data processing apparatus provided in this embodiment is the same as the display data processing method provided in any embodiment of the present invention, and can execute the display data processing method provided in any embodiment of the present invention, and has corresponding functions and advantageous effects. For details of the technology that are not described in detail in this embodiment, reference may be made to a method for processing display data provided in any embodiment of the present invention.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A display panel comprises a display area and a frame area surrounding the display area, and is characterized by further comprising a driving IC positioned in the frame area, and a temperature sensor and at least two thermocouples which are electrically connected with the driving IC respectively;
the thermocouple comprises a first hot electrode and a second hot electrode, wherein the first end of the first hot electrode is electrically connected with the first end of the second hot electrode to form a cold junction, and the second end of the first hot electrode and the second end of the second hot electrode are respectively electrically connected with the driving IC to form a hot junction;
the cold junction is located in the frame area far away from the driving IC, the hot junction is located at the driving IC, the temperature sensor is located at the hot junction, and the temperature sensor is used for detecting a first temperature at the hot junction;
the driving IC is used for determining a second temperature at the cold junction according to the thermal electromotive force generated by the thermocouple and the first temperature, determining the temperature distribution of the display panel according to the first temperature and the second temperature, and compensating the input display data according to the temperature distribution and the associated display lookup table so as to display an image with uniform brightness;
a processing device for displaying data is provided in the driving IC, and the processing device includes:
the display panel comprises a thermal electromotive force and temperature acquisition module, a driving IC and a display panel frame area, wherein the thermal electromotive force and temperature acquisition module is used for acquiring thermal electromotive forces generated by at least two thermocouples on the display panel respectively and a first temperature at a hot junction of the thermocouples, and the hot junction is positioned at the driving IC in the display panel frame area;
a second temperature determination module for determining a second temperature at a cold junction of the thermocouple according to the thermal electromotive force and the first temperature, wherein the cold junction is located in the bezel area away from the driver IC;
the temperature estimation module is used for determining the temperature of any point on the display panel by adopting a boundary element method according to the first temperature and the second temperature;
the gray adjustment value generating module is used for generating a gray adjustment value associated with the display lookup table according to the temperature of any point on the display panel and the display lookup table;
and the data compensation module is used for compensating the input display data of any point on the display panel according to the gray scale adjustment value.
2. The display panel according to claim 1, wherein two ends of the driving IC are respectively provided with one of the thermocouples, and the driving IC is configured to determine a temperature of any point on the display panel according to two of the first temperatures and two of the second temperatures of the two thermocouples.
3. The display panel according to claim 1, wherein the display panel comprises a plurality of the thermocouples, the plurality of thermocouples are overlapped end to form a thermoelectric stack, and a plurality of hot junctions and a plurality of cold junctions are formed at the junctions.
4. The display panel according to claim 1, wherein the display region comprises a plurality of pixel units defined by intersections of a plurality of gate lines and a plurality of data lines, the pixel units comprising thin film transistors and an anode and a cathode on one side of the thin film transistors; the thin film transistor comprises a polycrystalline silicon active layer, a grid electrode, a source electrode and a drain electrode, wherein the source electrode and the drain electrode are electrically connected with the polycrystalline silicon active layer, the grid electrode is electrically connected with the grid line, the source electrode is electrically connected with the data line, and the drain electrode is electrically connected with the anode;
the first hot electrode and the anode are prepared by the same process, and the second hot electrode and the data line, the grid line or the polycrystalline silicon active layer are prepared by the same process; or the first hot electrode and the data line are prepared by the same process, and the second hot electrode and the grid line or the polycrystalline silicon active layer are prepared by the same process.
5. The display panel of claim 1, wherein the thermocouple comprises a PN junction structure, and wherein the cold junction is located at a PN junction.
6. A display device comprising the display panel according to any one of claims 1 to 5.
7. A method for processing display data, comprising:
acquiring thermoelectromotive force generated by at least two thermocouples on a display panel respectively and a first temperature at a hot junction of the thermocouples, wherein the hot junction is positioned at a drive IC in a frame area of the display panel;
determining a second temperature at a cold junction of the thermocouple from the thermal electromotive force and the first temperature, wherein the cold junction is located within the bezel area remote from the driver IC;
determining the temperature of any point on the display panel by adopting a boundary element method according to the first temperature and the second temperature;
generating a gray scale adjustment value associated with the display lookup table according to the temperature of any point on the display panel and the display lookup table;
and compensating the input display data of any point on the display panel according to the gray scale adjustment value.
8. The method of claim 7, wherein the step of determining the temperature of any point on the display panel according to the first temperature and the second temperature by using a boundary element method comprises:
acquiring the temperatures of a plurality of measuring points at a plurality of hot junctions and a plurality of cold junctions in the frame area of the display panel;
and generating the temperature interpolation of any point on the display panel by adopting an interpolation algorithm according to the temperatures of the plurality of measurement points.
9. The display panel of claim 1, wherein the temperature estimation module comprises:
a multi-point temperature acquisition unit for acquiring temperatures of a plurality of measurement points at a plurality of hot junctions and a plurality of cold junctions within the display panel frame area;
and the temperature interpolation generating unit is used for generating the temperature interpolation of any point on the display panel by adopting an interpolation algorithm according to the temperatures of the plurality of measuring points.
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| CN201810107024.5A CN110136622B (en) | 2018-02-02 | 2018-02-02 | Display panel, display device, and display data processing method and device |
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| CN201810107024.5A CN110136622B (en) | 2018-02-02 | 2018-02-02 | Display panel, display device, and display data processing method and device |
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| JP7360246B2 (en) * | 2019-03-14 | 2023-10-12 | 株式会社ジャパンディスプレイ | display device |
| CN113066438B (en) * | 2021-03-29 | 2022-07-22 | 京东方科技集团股份有限公司 | Brightness compensation device and method and display device |
| CN115472136B (en) * | 2022-08-16 | 2023-11-10 | 昆山国显光电有限公司 | Display panel and electronic equipment |
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| JP4182930B2 (en) * | 2004-07-12 | 2008-11-19 | ソニー株式会社 | Display device and backlight device |
| JP4238913B2 (en) * | 2006-12-19 | 2009-03-18 | ソニー株式会社 | Display device temperature control method and display device |
| US20080284775A1 (en) * | 2007-05-17 | 2008-11-20 | Yuhren Shen | Liquid crystal display driving system and method for driving the same |
| CN104597645B (en) * | 2014-10-29 | 2017-09-01 | 上海天马微电子有限公司 | Array base palte, display panel and display device |
| CN104898741B (en) * | 2015-06-24 | 2017-03-15 | 合肥鑫晟光电科技有限公司 | Display device |
| CN105679265A (en) * | 2016-03-08 | 2016-06-15 | 京东方科技集团股份有限公司 | Panel compensation device and method |
| CN107393467A (en) * | 2017-08-22 | 2017-11-24 | 京东方科技集团股份有限公司 | Show backboard, display device, display device method for excessive heating protection and the method for controlling display device display picture brightness |
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