JP4586435B2 - Image display apparatus and driving method thereof - Google Patents

Description

  The present invention relates to an image display device including a display panel. More specifically, the present invention relates to a technique for mitigating uneven temperature distribution on a light emitting surface constituting a screen of a display panel using circuit means.

  Flat panel displays are widely used in products such as computer displays, portable terminals, and televisions. At present, liquid crystal display panels are mainly used, but the narrow viewing angle and slow response speed continue to be pointed out. On the other hand, an organic EL display formed of a self-luminous element can overcome the above-mentioned viewing angle and responsiveness problems, and can achieve a thin form, high brightness, and high contrast that do not require a backlight. It is expected as an alternative next-generation display device.

  By the way, it is generally known that a light emitting element in an organic EL display has a characteristic that the light emitting element deteriorates in proportion to the amount of light emission and time. At the same time, the deterioration rate varies depending on the temperature of the element itself. It is also known that it is a big problem. Since the organic EL light emitting element is a self-luminous type, it generates heat during operation and generates a higher amount of current as it achieves higher luminance, and generates heat at a higher temperature. It is also known that the higher the temperature, the faster the deterioration.

  On the other hand, flat panel displays always have the following two temperature irregularities. This is not due to the display pattern, but due to the shape and arrangement. The first is a temperature drop due to heat conduction from the outer peripheral light emitting part to the outer adjacent frame non-light emitting part. Since there is no light emitting element in the frame portion, the temperature is always equal to or lower than the light emitting portion, and the temperature of the outer peripheral light emitting portion can be lowered by conducting heat there. This was confirmed by measurement that in an organic EL display panel using glass, an area of about 20 mm from the outer periphery to the inner side was most affected.

  The second is a temperature drop caused by cooling the lower part of the light emitting surface by air convection. Flat panel displays are generally used in a vertical position as the size increases, and air convection tends to occur near the light emitting surface. At the lower end, air at a temperature close to the surrounding environment convects, so that the temperature of the light emitting section is lowered. However, since the air convection in the vicinity of the light emitting part is warmed by the heat of the light emitting part as it goes upward, the light emitting surface temperature does not decrease at a certain height or higher. This was also confirmed by measurement to be most affected in an area of about 200 mm from the lower end.

  That is, in the light emitting surface formed by the light emitting element of the display panel, even if light is emitted uniformly with the same gradation data, the temperature unevenness due to the above-mentioned causes occurs, and the temperature is high. As a result of the difference in deterioration speed between the low and high areas, and the brightness decrease rapidly in the high temperature area, the same area as the temperature unevenness appears as the brightness life deterioration unevenness (standard brightness unevenness). Therefore, it was necessary to make the temperature distribution in the light emitting surface as uniform as possible.

There are the following as conventional techniques related to measures against temperature unevenness.
JP 2003-295776 JP 2003-263131 A JP 2003-330419 A

Patent Document 1 controls the temperature controller based on the temperature detected from the light emitting element and the information that assumes the transition of the temperature rise, and warms or cools the regionized portion to make the temperature within the light emitting surface uniform. Adjust to. This can actually detect the temperature and control the temperature to be constant, but it is necessary to provide a temperature detection structure and a temperature adjustment structure, which makes the structure complicated and leads to an increase in cost. There was a problem.
Patent Document 2 accumulates luminance information of display data, and changes the display data so that the estimated amount of deterioration is averaged from the accumulated information. This is because the display data is changed, and thus it is possible to relatively easily correct luminance unevenness in units of one pixel. However, only the deterioration characteristics due to the light emission amount and time of the light emitting element are considered, and the deterioration rate due to temperature unevenness is considered. There is a problem that the luminance unevenness due to the difference between the two cannot be corrected.
Patent Document 3 refers to the temperature characteristic of the voltage-current characteristic of the light-emitting element stored in the device from the detected ambient temperature, and corrects the display data so as to obtain an appropriate luminance. This is intended to make the light emission luminance constant in any environment, and a detection means such as a temperature sensor is required, and since it is the environmental temperature that is detected, in-plane temperature unevenness is detected. It was not a thing. That is, there has been a problem that luminance unevenness caused by a difference in deterioration rate due to in-plane temperature unevenness cannot be corrected.

  In other words, until now, when trying to correct temperature unevenness, most of the methods are to provide a new structure that dissipates heat or gives heat, and there has been a problem that costs increase. Further, the correction of image sticking and luminance unevenness only corrects the unevenness of luminance deterioration caused by the display data, and there is a problem that the difference in deterioration rate caused by the temperature unevenness cannot be corrected.

  In view of the above-described problems of the conventional technology, an object of the present invention is to alleviate unevenness in temperature distribution on the light emitting surface of a display panel by circuit means. In order to achieve this purpose, the following measures were taken. That is, the present invention includes a display panel and a display data supply unit that supplies display data to the display panel. The display panel includes a pixel array composed of pixels arranged in a matrix, and is built in or externally attached to the display panel. The pixel array includes a light emitter in each pixel to form a light emitting surface as a whole, and the drive circuit drives each pixel according to the display data, and as a result, each light emission The body emits light with a luminance corresponding to the gradation represented by the display data, and in the image display device displaying an image on the light emitting surface, the light emitting surface generates heat due to light emission of each light emitting body and further dissipates the generated heat. The temperature distribution is uneven due to the bias, the light emitting surface is divided into a central open area and a surrounding light shielding area surrounding it, and the pixels in the open area emit light according to display data to display an image. Display pixels, pixels in the light-shielding region are dummy pixels that emit light according to display data but do not contribute to image display, and the display data supply unit includes the dummy pixels in the display data supplied to the display panel. The portion to be assigned to is processed in advance, so that the dummy pixel emits light with appropriate luminance, and the unevenness of the temperature distribution on the light emitting surface is made uniform by the heat generated accordingly.

  In one aspect, the light emitting surface has unevenness in which the temperature distribution is lower in the peripheral portion than in the central portion due to heat conduction from the peripheral portion surrounding the central portion toward the outer non-light emitting surface. The data supply unit processes the display data supplied to the dummy pixels so as to cancel out the uneven temperature distribution in which the peripheral part is lower than the central part. In another aspect, the light emitting surface has unevenness in which the temperature distribution becomes lower from the upper side due to convection of ambient air along the vertical direction, and the display data supply unit has a temperature lower from the upper side. Display data to be supplied to the dummy pixels is processed so as to cancel the uneven distribution. Preferably, the display data supply unit includes display data information detection means for extracting a frame gradation average value obtained by averaging gradations of pixels from display data input from the outside in units of frames. Display data to be supplied to the dummy pixels is processed according to the average value.

  The present invention also includes a display panel and a display data supply unit for supplying display data to the display panel. The display panel includes a pixel array composed of pixels arranged in a matrix, and is built in or externally attached to the display panel. The pixel array includes a light emitter in each pixel to form a light emitting surface as a whole, and the drive circuit drives each pixel according to the display data, and as a result, each light emission The body emits light at a luminance corresponding to the gradation represented by the display data, and an image is displayed on the light emitting surface. The light emitting surface generates heat due to light emission of each light emitting body, and further generates a temperature due to bias of heat dissipation generated. In the driving method of the image display device in which the distribution is uneven, the light emitting surface is divided into a central open region and a surrounding light shielding region surrounding the light emitting surface, and the pixels in the open region emit light according to display data and the image is displayed. Display pixels for display, pixels in the light-shielding region are dummy pixels that emit light according to display data but do not contribute to image display, and the display data supply unit includes the dummy pixels in the display data supplied to the display panel. The portion to be allocated to the above is processed in advance, so that the dummy pixel emits light with an appropriate luminance, and the unevenness of the temperature distribution on the light emitting surface is made uniform by the heat generated accordingly.

  According to the present invention, the organic EL display panel to be used is shielded so that the outside of the visible light emitting pixel arrangement region (open region) does not emit light outside the panel, and is formed in the same structure as the light emitting pixel in this light shielding region. The dummy light emitting pixels are arranged in single or plural columns / rows continuously from the visible light emitting pixels. The dummy pixel emits heat to generate heat, preventing the temperature drop due to heat conduction from the outer peripheral visible light emitting part to the non-light emitting part without pixel arrangement, and the temperature drop caused by cooling the lower part of the visible light emitting surface by air convection, and visible The temperature is kept uniform over the light emitting surface. The dummy pixel emits light by applying gradation data in the same way as normal display data, and the gradation data is averaged for one frame gradation of the input display data so that the temperature of the gradation data is the same as that of the region not affected by the temperature drop Calculated based on the value.

  According to the present invention, a dummy pixel is provided in a light-shielding region that is not related to a visible light-emitting region and is continuously arranged with the visible light-emitting pixel and is shielded so as not to emit light outside the panel. That is, since the amount of generated heat can be controlled to be the same temperature in all regions according to the average value of the input display data, it is possible to avoid a temperature drop that occurs in the light emitting outer peripheral portion and the light emitting lower portion region, There is an effect that the temperature can be kept uniform over the light emitting surface. That is, there is an effect that a difference in deterioration rate of the organic EL light-emitting element can be suppressed and regular luminance unevenness due to pixel deterioration can be prevented.

  Further, according to the present invention, since the dummy pixel does not exist in the visible light emitting region, there is an effect that the display quality is not impaired at all in keeping the temperature uniform over the light emitting surface.

  Furthermore, according to the present invention, the dummy pixel can be realized by extending the process of forming a normal light emitting pixel, and the drive system can be realized relatively easily without requiring a large change in means other than a slight increase in the number of drive pixels. There is an effect that can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of an image display apparatus according to the present invention. As shown in the figure, the image display apparatus includes a display panel 1 and a display data supply unit 2 that supplies display data to the display panel 1. The display panel 1 includes a pixel array composed of pixels 101 arranged in a matrix and a drive circuit (not shown) that is built in or externally attached to the display panel 1. The pixel array includes a light emitter in each pixel 101 and forms a light emitting surface 100 as a whole. The drive circuit drives each pixel 101 in accordance with the display data. As a result, each light emitter emits light at a luminance corresponding to the gradation represented by the display data, and displays an image on the light emitting surface 100.

  The light emitting surface 100 generates heat due to the light emission of each light emitter, and the temperature distribution is uneven due to the unevenness of heat dissipation. The light emitting surface 100 is divided into a central open area 100A and a surrounding light shielding area 100M surrounding it. The pixel 101 in the open area 100A is a display pixel that emits light according to display data and displays an image. On the other hand, the pixel 101 in the light shielding region 100M is a dummy pixel that emits light according to display data but does not contribute to image display. The dummy pixels are divided into an upper dummy pixel 101T, a lower dummy pixel 101B, a left dummy pixel 101L, and a right dummy pixel 101R. The dummy pixels 101T, 101B, 101L, and 101R have the same structure as the light-emitting pixels 101 in the region 100M that is shielded so as not to emit light outside the panel 1 outside the visible light-emitting pixel arrangement region 100A. Are arranged in one or more columns / rows continuously. The display data supply unit 2 processes in advance the portion of the display data supplied to the display panel 1 to be assigned to the dummy pixels 101T, 101B, 101L, 101R, so that the dummy pixels 101T, 101B, 101L, 101R have an appropriate luminance. The unevenness of the temperature distribution of the light emitting surface 100 is made uniform by the heat generated by the light emission.

  In one embodiment, the light emitting surface 100 has unevenness in which the temperature distribution is lower in the peripheral portion than in the central portion due to heat conduction from the peripheral portion surrounding the central portion toward the non-light emitting surface 200 outside thereof. In order to cope with this, the display data supply unit 2 processes the display data supplied to the dummy pixels so as to cancel out the uneven temperature distribution in which the peripheral part is lower than the central part. In another aspect, the light emitting surface 100 has unevenness in which the temperature distribution becomes lower from the upper side due to the convection of the ambient air along the vertical direction. In order to cope with this, the display data supply unit 2 processes the display data supplied to the dummy pixels so as to cancel the unevenness of the temperature distribution in which the lower part is lower than the upper part.

  Preferably, the display data supply unit 2 includes display data information detection means 21 that extracts a frame gray scale average value obtained by averaging the gray scale of each pixel from display data input from the outside in units of frames. Display data to be supplied to the dummy pixels is processed according to the average value. Specifically, the display data supply unit 2 is detected by the display data information detection unit 21 in addition to the display data information detection unit 21 that extracts information such as the frame gradation average value of the display data signal from the input display data signal. Left and right dummy pixel data generation means 22LR for generating gradation data of left and right dummy pixels 101L and 101R from the frame gradation average value, and upper dummy pixel data generation means for similarly generating gradation data of upper dummy pixel 101T 22T, lower dummy pixel data generation means 22B that similarly generates data of the lower dummy pixel 101B, and dummy pixel light emission data generation means 22 that includes them, and receives dummy pixel gradation information, and receives it as an input display data signal. Dummy pixel light emission data adding circuit 23 for adding dummy pixel area information, and a dummy image Composed of an organic EL display panel 1 for displaying receives the display data signal output by the light emitting data adding circuit 23.

  The display data information detecting means 21 detects the average value of one frame gradation of the input display data signal. The 1-frame gradation average value information detected by the display data information detection unit 21 is input to the dummy pixel light emission data generation unit 22. The dummy pixel light emission data generation means 22 includes left and right dummy pixel light emission data generation means 22LR that determines the light emission gradation of the left and right dummy pixels, and a lower dummy pixel light emission data generation means 22B that determines the light emission gradation of the lower dummy pixel. And the upper dummy pixel light emission data generating means 22T for determining the light emission gradation of the upper dummy pixel, and the light emission gradation in each area is determined based on the inputted one-frame gradation average value information. Is done. There are the following methods for calculating the light emission gradation.

  First, the light emitting unit is operated to emit light with the maximum uniform gradation within the surface, and the temperature distribution is measured in a state where it is placed horizontally with respect to the ground. In the temperature distribution, temperature unevenness as shown in FIG. 2 due to a temperature drop due to heat conduction to the outer adjacent frame non-light emitting portion is observed in the outer peripheral light emitting portion. The plan view of FIG. 2 schematically shows the surface temperature distribution of the panel 1. As shown in the drawing, the temperature of the peripheral portion is lower than that of the central portion of the light emitting surface 100, and this is a region where temperature unevenness occurs. Compared with the central portion of the light emitting surface 100, the peripheral portion loses heat due to heat conduction or the like, and therefore the temperature is low.

  The graph included in FIG. 2 represents the temperature distribution of the corner portion of the panel 1 and the portion along the diagonal line (shown by a one-dot chain line). This graph shows distance on the horizontal axis and temperature on the vertical axis. As is apparent from the graph, it can be seen that the end portion has a temperature lower than the center of the light emitting surface over a width of about 20 mm. This is because an area of about 20 mm from the outer periphery is most affected in an organic EL display panel using glass, and this area is set as a correction target area.

  At the same time, the temperature distribution is measured with the panel placed vertically following the actual use state. The temperature distribution measured here is subtracted from the temperature distribution measured in the horizontal state as described above, as temperature unevenness due to a temperature drop caused by cooling the lower part of the light emitting surface due to air convection at the lower part of the light emitting surface. Observed. FIG. 3 is a schematic diagram showing the deviation of the temperature distribution between the upper and lower sides of the panel. As shown in the drawing, the light emitting surface 100 is a region where the temperature of the lower part is lower than that of the upper part and temperature unevenness occurs. This is because when the panel 1 is placed upright, the lower part is relatively strongly cooled by the convection of the surrounding air. The temperature distribution at the bottom of panel 1 is shown in the graph. As is apparent from the graph, it can be seen that the temperature at the bottom of the panel is lower at a width of about 200 mm than at the top and center of the panel. This is because it is most affected in an area of about 200 mm from the lower end, and this area is also set as a correction target area.

  The gradation-temperature rise characteristic is measured in each of the region not subjected to the temperature drop obtained from FIGS. 2 and 3 and the innermost region of the upper, lower, left, and right dummy pixels. As a result, data as shown in FIG. 4 is often obtained. In the first place, the dummy pixel area is affected by the temperature drop caused by the heat conduction from the outer peripheral visible light emitting part to the non-light emitting part without the pixel arrangement described above and the temperature drop caused by the cooling of the lower part of the visible light emitting part by air convection. If it is smaller, a temperature drop is observed on the innermost side of the dummy pixel. For left and right dummy pixels, only the effect of temperature drop due to heat conduction to the non-light emitting part without the outer pixel array, and for the upper dummy pixel, temperature drop due to heat conduction to the non-light emitting part without the upper pixel array As a result of lowering the temperature drop due to the convection of air heated in the lower light emitting region, the lower dummy pixel has a temperature drop due to heat conduction to the non-light emitting part without the lower pixel array. In addition to the effect of the above, a result of adding a temperature decrease effect caused by cooling by air convection is observed.

  Next, the gradation data of the dummy pixel is determined as shown in FIG. 5 based on the gradation-temperature rise characteristic for each location obtained by the measurement. First, the frame grayscale average value of the input display data is applied to the grayscale-temperature rise characteristics in the region where the temperature is not lowered. This is the average value of all the data in the entire visible light emitting surface in the calculation method of the average value, and even if there is a local temperature distribution according to the display data, the entire region is an average value gradation. This is because it is a standard that is considered to have a uniform temperature rise and a substantially equivalent temperature rise. The temperature rise value at this time is α. Then, the light emission gradations of the left, right, upper, and lower dummy pixels are determined so that the temperature rise value of α is reached. The light emission gradation of the dummy pixel is changed following the average value detection cycle of the input display data. In addition, in this calculation method, there may be a situation in which light emission should be performed when the grayscale data of the dummy pixel exceeds the maximum grayscale, but when designing the pixel circuit, only the dummy pixel alone is more than the same grayscale data. It can be easily avoided by designing so that the current flows and generates heat.

  The dummy pixel light emission data output from the dummy pixel light emission data generating means is input to the dummy pixel light emission data adding circuit by the method as described above. The dummy pixel light emission data adding circuit changes the timing of adding light emission data for dummy pixels in addition to the display data in the original visible light emission region, and outputs the changed display data to the organic EL display module. The organic EL display module receives and displays the display data signal output by the dummy pixel light emission data adding circuit.

  FIG. 6 is a block diagram showing a configuration example of the organic EL display panel shown in FIG. The panel 1 includes a pixel array unit 100 in which pixel circuits (PXLC) 101 are arranged in an m × n matrix, a horizontal selector (HSEL) 103, a write scanner (WSCN) 104, a drive scanner (DSCN) 105, and a horizontal selector. The signal lines DTL101 to DTL10n to which signals corresponding to the luminance information are selected are supplied, the scanning lines WSL101 to WSL10m are selectively driven by the write scanner 104, and the scanning lines DSL101 to DSL10m are selectively driven by the drive scanner 105. . The pixel array unit 100 constitutes a light emitting surface, and the surface temperature distribution is uneven. In order to cope with this, the pixel 101 includes a dummy pixel in addition to a normal display pixel. However, on the circuit configuration, both the display pixel and the dummy pixel have the same configuration as the pixel circuit 101.

  FIG. 7 is a circuit diagram showing a configuration example of the pixel circuit shown in FIG. As shown in the figure, the pixel circuit 101 is basically composed of a p-channel thin film field effect transistor (hereinafter referred to as TFT). That is, the pixel circuit 101 includes a drive TFT 111, a switching TFT 112, a sampling TFT 115, an organic EL element 117, and a storage capacitor C111. The pixel circuit 101 having such a configuration is arranged at an intersection between the signal line DTL101 and the scanning lines WSL101 and DSL101. The signal line DTL101 is connected to the drain of the sampling TFT 115, the scanning line WSL101 is connected to the gate of the sampling TFT 115, and the other scanning line DSL101 is connected to the gate of the switching TFT 112.

  The drive TFT 111, the switching TFT 112, and the organic EL element 117 are connected in series between the power supply potential Vcc and the ground potential GND. That is, the source of the drive transistor 111 is connected to the power supply potential Vcc, while the cathode of the organic EL element (light emitting element) 117 is connected to the ground potential GND. In general, the organic EL element 117 is represented by a diode symbol because of its rectifying property. On the other hand, the sampling TFT 115 and the storage capacitor C111 are connected to the gate of the drive TFT111. The gate-source voltage of the drive TFT 111 is represented by Vgs.

  The operation of the pixel circuit 101 is as follows. First, when the scanning line WSL101 is selected (low level here) and a signal is applied to the signal line DTL101, the sampling TFT 115 is turned on and the signal is written into the holding capacitor C111. The signal potential written in the storage capacitor C111 becomes the gate potential of the drive transistor 111. Subsequently, when the scanning line WSL101 is in a non-selected state (here, high level), the signal line DTL101 and the drive TFT 111 are electrically disconnected, but the gate potential Vgs of the drive TFT 111 is stably held by the holding capacitor C111. . Subsequently, when another scanning line DSL101 is selected (here, at a low level), the switching TFT 112 becomes conductive, and a drive current flows through the TFT 111, TFT 112, and the light emitting element 117 from the power supply potential Vcc toward the ground potential GND. When the DSL 101 is in a non-selected state, the switching transistor 112 is turned off and the driving current does not flow. The switching TFT 112 is inserted to control the light emission time of the light emitting element 117.

  The current flowing through the TFT 111 and the light emitting element 117 has a value corresponding to the gate-source voltage Vgs of the TFT 111, and the light emitting element 117 continues to emit light with a luminance corresponding to the current value. As described above, the operation of selecting the scanning line WSL101 and transmitting the signal given to the signal line DTL101 to the inside of the pixel circuit 101 is referred to as “writing”. As described above, once a signal is written, the light emitting element 117 continues to emit light at a constant luminance until the next rewriting.

It is a block diagram which shows embodiment of this invention. It is a schematic diagram with which it uses for operation | movement description of embodiment shown in FIG. FIG. 2 is a schematic diagram for explaining the operation of the embodiment shown in FIG. 1. It is a graph with which it uses for operation | movement description of embodiment similarly shown in FIG. It is a graph with which it uses for operation | movement description of embodiment similarly shown in FIG. It is a block diagram which shows the structural example of the display panel shown in FIG. FIG. 2 is a circuit diagram showing a configuration example of the display panel similarly shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display panel, 2 ... Display data supply part, 100 ... Light emission surface, 101 ... Pixel, 101T ... Upper dummy pixel, 101B ... Lower dummy pixel, 101L ... Left Dummy pixel, 101R ... Right dummy pixel

Claims (5)

A display panel and a display data supply unit for supplying display data to the display panel;
The display panel has a pixel array composed of pixels arranged in a matrix, and a drive circuit built in or externally attached to the display panel,
The pixel array includes a light emitter in each pixel to form a light emitting surface as a whole,
The drive circuit drives each pixel according to the display data, and as a result, each light emitter emits light at a luminance according to the gradation represented by the display data, and displays an image on the light emitting surface.
The light emitting surface generates heat due to light emission of each light emitter, and the temperature distribution is uneven due to the bias of heat dissipation generated,
The light-emitting surface is divided into a central open region and a surrounding light-shielding region surrounding it.
The pixels in the open area are display pixels that emit light according to display data and display an image, and the pixels in the light-shielding area are dummy pixels that emit light according to display data but do not contribute to image display,
The display data supply unit processes in advance the portion of the display data supplied to the display panel to be assigned to the dummy pixel, and thereby causes the dummy pixel to emit light with an appropriate luminance, and the light emitted by the heat generated thereby. An image display device characterized by uniformizing temperature unevenness of a surface. The light emitting surface has unevenness in which the temperature distribution is lower in the peripheral portion than in the central portion due to heat conduction from the peripheral portion surrounding the central portion toward the non-light emitting surface outside thereof.
The image display device according to claim 1, wherein the display data supply unit processes display data supplied to the dummy pixels so as to cancel out uneven temperature distribution in which a peripheral portion is lower than a central portion. The light emitting surface has unevenness in which the temperature distribution is lower from the upper side due to the convection of ambient air along the vertical direction,
The image display device according to claim 1, wherein the display data supply unit processes the display data supplied to the dummy pixels so as to cancel out the uneven temperature distribution in which the lower portion is lower than the upper portion.   The display data supply unit includes display data information detection means for extracting a frame grayscale average value obtained by averaging the grayscale levels of each pixel from display data input from the outside in units of frames. The image display apparatus according to claim 1, wherein display data to be supplied to the dummy pixels is processed accordingly. The display panel includes a display panel and a display data supply unit that supplies display data to the display panel. The display panel includes a pixel array that includes pixels arranged in a matrix and a drive circuit that is built in or externally attached to the display panel. The pixel array includes a light emitter in each pixel to form a light emitting surface as a whole, and the drive circuit drives each pixel in accordance with the display data. Light is emitted at a luminance corresponding to the gradation to be expressed, and an image is displayed on the light emitting surface. The light emitting surface generates heat due to light emission of each light emitter, and unevenness in temperature distribution is generated due to bias of heat dissipation generated. In the driving method of the image display device,
The light emitting surface is divided into a central open area and a surrounding light shielding area surrounding it.
The pixel in the open area is a display pixel that emits light according to display data and displays an image,
The pixels in the light-shielding region are dummy pixels that emit light according to display data but do not contribute to image display.
The display data supply unit processes in advance the portion of the display data supplied to the display panel to be assigned to the dummy pixel, thereby causing the dummy pixel to emit light with an appropriate luminance, and the light emitted by the heat generated thereby. A method for driving an image display device, characterized in that the unevenness of the temperature distribution of the surface is made uniform.

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