JP2006284973A - Method of determining temperature irregularity compensation amount, display device, temperature irregularity amount compensation determining system, temperature irregularity compensating system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein there is no method for properly temperature irregularity due to convection of air, when the inclination angle of emission face with respect to vertical direction can be modified. <P>SOLUTION: A system for determining a compensating amount for compensating temperature irregularities in the emission face, arranged by a self-luminous element in a matrix form is constituted of (1) a storage region for storing a reference compensation amount set for compensating the temperature irregularities of the lower part of the emission face generated, when the emission face is installed in parallel with respect to vertical direction; (2) an inclination angle detection part for detecting the inclination angle of the emission face with respect to the vertical direction; (3) a regulation coefficient determination part for determining a regulation coefficient with respect to the reference compensation amount, in response to the size of the inclination angle; and (4) a compensation amount regulation for regulating the reference compensation amount by the determined regulation coefficient. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  One aspect of the present invention relates to a correction amount determination method for correcting temperature unevenness in a light emitting surface in which self-emitting elements are arranged in a matrix. One embodiment of the present invention relates to a temperature unevenness correction amount determination device and a display device equipped with the same. One embodiment of the present invention relates to a temperature unevenness correction apparatus equipped with a temperature unevenness correction amount determination apparatus. One embodiment of the present invention relates to a program for causing a computer to execute a function for determining a correction amount used for correcting temperature unevenness.

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

By the way, it is known that organic EL elements and other self-light-emitting elements have characteristics that deteriorate in accordance with the light emission amount and the light emission time. At the same time, it is known that the degradation rate of these elements varies depending on the temperature of the elements themselves.
Since the self-luminous element is a self-luminous type, it generates heat during operation. And, as the higher luminance is realized, a larger amount of current is required, and heat is generated at a higher temperature. As a result, the higher the temperature, the faster the deterioration. Therefore, in order to realize a long life of the flat panel display, appropriate temperature control is required.

An example of the temperature control method currently proposed is shown below.
Japanese Patent Laid-Open No. 2003-263131 discloses a technique for accumulating luminance information of display data and correcting the display data so that an estimated value of deterioration estimated from the accumulated luminance information is averaged. ing.

Certainly, the technique according to Patent Document 1 is effective in eliminating the uneven distribution of the temperature distribution caused by the unevenness of the image pattern.
However, the uneven distribution of the temperature distribution on the light emitting surface is also caused by factors other than the displayed image pattern. For example, the influence of air convection in the vicinity of the light emitting surface. This is also because the larger the light emitting area, the light emitting surface is installed in parallel with the vertical direction.
In the case of this installation mode, the temperature of the convection air near the lower end of the light emitting surface is almost the same as the environmental temperature, whereas the temperature of the convection air above it is higher than the environmental temperature heated on the light emitting surface. .

For this reason, while the temperature of the light emitting surface is lowered by the convective air near the lower end, a phenomenon is observed in which the temperature of the light emitting surface is not lowered by the convective air above the center. As a result, temperature unevenness occurs in the light emitting surface.
FIG. 1 shows an image of temperature unevenness occurring in the light emitting surface. In the figure, the temperature from the vicinity of the center of the light emitting surface 1 to the upper region is substantially constant. On the other hand, the temperature of the lower region 3 of the light emitting surface 1 shown by the shaded display becomes lower toward the lower end.
In the figure, the region where the amount of temperature decrease is larger than the temperature of the information region is shown with darker shading.

FIG. 2 shows this temperature change. FIG. 2 shows a change in surface temperature when the entire light emitting surface emits light with the same input value. In the figure, the horizontal axis is the distance from the center of the light emitting unit, and the vertical axis is the temperature. As shown in FIG. 2, it can be seen that the influence of temperature unevenness is large within a range of 200 mm from the lower end.
In addition, the generation range of this temperature nonuniformity also changes with inclination angles with respect to the vertical direction of the light emitting surface.

The inventors pay attention to the above problems and propose a correction amount determination method suitable for correcting temperature unevenness generated in the lower region of the light emitting surface according to the inclination angle.
That is, a method having the following processing functions is proposed.
(1) Processing for reading a reference correction amount set for correcting temperature unevenness under the light emitting surface that occurs when the light emitting surface is installed parallel to the vertical direction. (2) Detecting the inclination angle of the light emitting surface with respect to the vertical direction. Process (3) Process for determining an adjustment coefficient for the reference correction amount according to the inclination angle (4) Process for adjusting the reference correction amount with the determined adjustment coefficient Note that this technique is realized as hardware. It can also be realized as software. Of course, part of the processing can be executed as hardware, and the remaining processing can be executed as software.

  If this invention is used, the correction amount according to the inclination angle of the light emitting surface with respect to the vertical direction can be determined. As a result, the entire temperature of the light emitting surface can be made uniform regardless of the usage mode of the display device. That is, the deterioration rate of the entire screen can be made uniform, and the life of the display device can be extended.

Embodiments of temperature unevenness correction technology that employs the technical technique according to the invention will be described below. Here, a case where temperature unevenness of the organic EL panel is eliminated will be described.
In addition, the well-known or well-known technique of the said technical field is applied to the part which is not illustrated or described in particular in this specification.
The embodiment described below is one embodiment of the present invention and is not limited thereto.

(A) Temperature unevenness correction device (A-1) Embodiment 1
(A) Device Configuration FIG. 3 shows a configuration example of a temperature unevenness correction device. The temperature unevenness correction device 11 includes a temperature unevenness correction amount determination unit 13 and a temperature unevenness correction execution unit 15 as main components. Among these, the temperature unevenness correction execution unit 15 is a processing device that executes a correction operation according to a specific correction method. The correction method includes, for example, a method of correcting the display signal according to the generated temperature unevenness, a method of correcting the heat generation amount of the dummy pixel, a method of changing the light emission time according to the pixel position, and the like. The configuration of the temperature unevenness correction execution unit 15 corresponding to each correction method will be described later.

The temperature unevenness correction amount determination unit 13 is a processing device that determines a correction amount according to temperature unevenness, and includes a use inclination detection unit 13A, an adjustment coefficient determination unit 13B, a correction amount adjustment unit 13C, and a reference correction amount storage unit 13D. Is done.
The use inclination detector 13A is a processing device that detects the inclination of the light emitting surface according to the use mode. That is, the use inclination detector 13A detects the inclination angle of the light emitting surface with respect to the vertical direction (the degree of inclination with respect to the horizontal direction).

FIG. 4 shows an example of usage.
FIG. 4A shows an example of use when the stand mechanism 23 is attached to the back surface of the display device 21. In the case of this stand mechanism 23, the inclination angle of the light emitting surface 25 increases as the stand opening increases, and the inclination angle of the light emitting surface 25 decreases as the stand opening decreases. The stand refers to a mechanism that can support the display device 21 with a specific or arbitrary inclination with respect to the installation surface.
When this type of opening / closing mechanism is used, the use inclination detector 13A electrically or optically detects the degree of opening of the stand as the amount of displacement of the coupling member. The detection result is output as an analog signal or a digital signal.

On the other hand, the inclination angle of the light emitting surface 25 may be limited. An example is shown in FIGS. 4B and 4C. Among these, FIG. 4B shows an example of use when the display device 21 is attached to the cradle 27. FIG. 4C shows a usage example when the display device 21 is attached to the wall hanging tool 29.
When this type of attachment mechanism is used, the use inclination detector 3A electrically or optically detects the presence or absence of attachment or attachment to the object.
Also, other detection methods can be applied to the use inclination detection unit 13A. For example, it is possible to apply a mechanism for electrically detecting the contact position between the center of gravity placed in a circular (spherical) cavity and the inner wall.

The adjustment coefficient determination unit 13B is a processing device that determines an adjustment coefficient for the reference correction amount according to the magnitude of the tilt angle. The reason for using the adjustment coefficient is that the temperature distribution on the light emitting surface changes according to the usage pattern (tilt of the light emitting surface).
In this embodiment, the correction amount used when the inclination angle of the light emitting surface with respect to the vertical direction is 0 ° (zero) is referred to as “reference correction amount”. Data giving the reference correction amount is stored in the reference correction amount storage unit 13D.

FIG. 5 shows the relationship between the reference correction amount and the screen position. The horizontal axis is distance, and the vertical axis is correction amount. The basic correction amount is set so that the characteristic curve maintains a constant value when superimposed on the temperature distribution shown in FIG.
The region where the temperature correction based on the reference correction amount is mainly executed (main correction amount region) is a range of 200 mm upward from the lowermost end of the light emitting unit. This region is a region where a decrease in temperature is observed without any allowance.
Here, the adjustment coefficient determination unit 13B holds the correspondence relationship between the tilt angle and the adjustment coefficient in the table memory. The adjustment coefficient corresponding to the tilt angle can also be obtained by calculation. For example, a linear function having a negative slope is given.

FIG. 6 shows an example of determining the adjustment coefficient in accordance with the inclination angle. In the case of this embodiment, the adjustment coefficient uses a value between 0 and 1.
FIG. 6A shows a case where the inclination angle of the light emitting surface 25 is 0 ° (zero). This usage mode is referred to as a vertical usage mode. In this case, the adjustment coefficient is “1”.
FIG. 6B shows a case where the inclination angle of the light emitting surface 25 is 90 ° (zero). That is, the usage mode is shown in which the light emitting surface 15 is tilted until it becomes parallel to the horizontal direction. This usage mode is referred to as a horizontal usage mode. In this case, the adjustment coefficient is “0”.
Note that, in the range of the tilt angle from 0 ° to 90 °, the smaller the tilt angle, the closer the adjustment coefficient is to “1”, and the larger the tilt angle, the closer the adjustment coefficient is to “0” (FIG. 7).

The correction amount adjustment unit 13C is a processing device that adjusts the reference correction amount with the determined adjustment coefficient. In the case of this embodiment, the correction amount adjustment unit 13C multiplies the basic correction amount by the adjustment coefficient to adjust the magnitude of the correction amount.
FIG. 8 shows the relationship between the correction amount output from the correction amount adjustment unit 13C and the screen position. The horizontal axis is distance, and the vertical axis is correction amount.
For example, in the case of horizontal usage, the correction amount is the same value regardless of the screen position. This means that temperature unevenness correction is unnecessary.
Further, for example, in the case of the vertical usage mode, the correction amount is given a larger correction amount toward the light emitting end in the main correction amount region.
When the inclination angle is at these intermediate positions, the correction amount changes within the range between the two curves. In FIG. 8, the relationship between the correction amount and the screen position is indicated by a thin line and a broken line for two inclination angles.

(B) Correction Operation FIG. 9 shows a series of processing procedures executed by the temperature unevenness correction apparatus 1.
In FIG. 9, the correction amount adjustment unit 13C first reads the reference correction amount from the reference correction amount storage unit 13D (P1). However, the reading of the reference correction amount may be performed in parallel with the processes P2 and P3, or may be performed after the process P3.
Next, the use inclination detector 13A detects the current inclination angle (P2). Thereafter, the adjustment coefficient determination unit 13B determines an adjustment coefficient corresponding to the inclination angle, and gives this to the correction amount adjustment unit 13C (P3).
The correction amount adjustment unit 13C multiplies the basic correction amount by the adjustment coefficient to adjust the correction amount according to the current usage mode (P4). The adjusted correction amount is given to the temperature unevenness correction execution unit 15.
The temperature unevenness correction execution unit 15 generates a correction pattern using the adjusted correction amount, and applies the correction pattern to a signal to be corrected (P5). Thereby, the temperature distribution on the light emitting surface is made uniform in any use mode.

(C) Effects of Embodiments Using this temperature unevenness correction device 11 can generate a temperature unevenness correction pattern suitable for the inclination angle of the light emitting surface even when the light emitting surface is used in a mode other than the vertical usage mode. .
Therefore, in any use mode (tilt angle), the temperature distribution on the light emitting surface can be kept uniform over the entire light emitting surface. In particular, when the light emitting area is small or medium, it is often used at an inclination angle other than the vertical usage mode, so that mounting on these devices is preferable.
As a result, a difference in deterioration rate of the light emitting elements can be suppressed, and fixed luminance unevenness due to pixel deterioration can be prevented. This is effective for extending the life of the display panel.

(A-2) Embodiment 2
In this embodiment, a temperature unevenness correction apparatus that corrects temperature unevenness by combining a temperature unevenness correction pattern with a display signal will be described.
FIG. 10 shows a configuration example of the temperature unevenness correction apparatus. The temperature unevenness correction device 31 includes a temperature unevenness correction amount determination unit 13 and a temperature unevenness correction execution unit 33 as main components.
Among these, the configuration of the temperature unevenness correction amount determination unit 13 is the same as that of the first embodiment (FIG. 3).
The temperature unevenness correction execution unit 33 includes a correction pattern generation unit 33A and a display data conversion unit 33B. The correction pattern generation unit 33A executes a process of generating a correction pattern by associating the correction amount determined by the temperature unevenness correction amount determination unit 13 with the actual pixel position.

The display data conversion unit 33B performs a process of combining the generated correction pattern with the input display signal and converting it into an output display signal.
Specifically, the gradation value of the input display signal corresponding to the pixel in the range of 200 mm from the lowermost end of the light emitting portion, which is the main correction area, is converted to a gradation (high luminance) higher than that at the time of input. As a result, the temperature of the main correction region is controlled to be higher than the upper part of the light emitting unit.
Of course, the correction amount is adjusted according to the use mode (inclination angle). Therefore, the temperature is made uniform over the entire light emitting surface.

(A-3) Embodiment 3
In this embodiment, a temperature unevenness correction apparatus that corrects temperature unevenness by adjusting the amount of heat generated by a dummy pixel using a temperature unevenness correction pattern will be described.
FIG. 11 shows a configuration example of the display panel 41 having a dummy pixel region. In the display panel 41, a dummy pixel area 45 is arranged in an outer peripheral area adjacent to the effective display area 43.
The surface of the dummy pixel region 45 is shielded from light so that the light of the dummy pixel does not leak outside. That is, the dummy pixel area 45 is used only for heat generation.

FIG. 12 shows a configuration example of the temperature unevenness correction apparatus. The temperature unevenness correction device 51 includes the temperature unevenness correction amount determination unit 13 and the temperature unevenness correction execution unit 53 as main components.
Among these, the configuration of the temperature unevenness correction amount determination unit 13 is the same as that of the first embodiment (FIG. 3).
The temperature unevenness correction execution unit 53 includes a display data information detection unit 53A, a dummy pixel data generation unit 53B, and a dummy pixel data addition unit 53C.
The display data information detection unit 53A detects the average value of the gradation values of each pixel located in the effective display area 43 in units of frames. This detection result is given to the dummy pixel data generation unit 53B.

The dummy pixel data generation unit 53B determines the gradation value of the dummy pixel with reference to the given average gradation value. The dummy pixels include a dummy pixel located above the effective display area 43 (upper dummy pixel), a dummy pixel located below the effective display area 43 (lower dummy pixel), a left side of the effective display area 43, and There are dummy pixels (side dummy pixels) located on the right side.
The dummy pixel data generation unit 53B generates optimal dummy pixel data according to the positions of these dummy pixels.
The dummy pixel data generation unit 53B generates dummy pixel data from two viewpoints.

One is to correct the temperature decrease of the pixels located along the outer edge of the effective display area. The main purpose of this is correction of a temperature drop caused by heat generated in the pixels at the outer edge portion being diffused outside the effective display area by heat conduction.
For this temperature correction, all the upper, lower and side dummy pixels are used. The dummy pixel data used for correcting the temperature unevenness is calculated according to the average gradation value in the effective display area. Generally, the gradation value of the dummy pixel data is set to a value higher than the average gradation value in the effective display area.
The other is a viewpoint of correcting the temperature unevenness in consideration of the inclination angle of the light emitting surface according to the usage mode. This mainly focuses on correction of temperature drop due to air convection. For this temperature correction, an upper dummy pixel and a lower dummy pixel are used.

The dummy pixel data generation unit 53B calculates the gradation values of the upper dummy pixel and the lower dummy pixel from the temperature unevenness correction amount determination unit 13 by a correction amount corresponding to the inclination angle of the light emitting surface.
As described above, when the tilt angle is 0 ° (zero) or small, the correction amount given from the temperature unevenness correction amount determination unit 13 is large, and when the tilt angle is 90 ° (horizontal) or close to horizontal, the temperature unevenness correction amount determination is determined. The correction amount given from the unit 13 becomes small.
Therefore, when the light emitting surface is in a substantially vertical usage mode, the dummy pixel data generation unit 53B greatly increases the gradation value for the lower dummy pixel than the gradation value for the upper dummy pixel. In addition, the difference between the gradation value of the lower dummy pixel and the gradation value of the upper dummy pixel becomes smaller as the usage pattern of the light emitting surface approaches the horizontal usage pattern. Incidentally, the gradation value of the lower dummy pixel and the gradation value of the upper dummy pixel in the horizontal usage mode are the same as the gradation value of the side dummy pixel.

The dummy pixel data generation unit 53B adds each gradation value (correction amount) calculated for correcting the temperature decrease due to air convection to the gradation value calculated for correcting the temperature decrease due to heat conduction. A gradation value (dummy pixel data) to be given to the dummy pixel is generated.
The dummy pixel data adding unit 53C executes a process of adding the dummy pixel data generated in this way to the input display signal. That is, a function of adding dummy pixel data to an input display signal that gives a gradation value of each pixel in the effective display area 43 is realized.
Of course, the added dummy pixel data is used for lighting driving of the dummy pixels at the corresponding positions.
In the case of the temperature unevenness correction apparatus according to this embodiment, the gradation information of the image displayed in the effective display area is not changed for temperature unevenness correction. Therefore, the gradation of the displayed screen is not impaired.

(A-4) Embodiment 4
In this embodiment, a temperature unevenness correction apparatus that corrects temperature unevenness by adjusting the light emission time (duty ratio) of each pixel with a temperature unevenness correction pattern will be described. In this embodiment, it is necessary that the pixel circuit constituting the light emitting unit and its drive circuit correspond to the duty ratio control.
FIG. 13 shows a configuration example of the temperature unevenness correction apparatus. The temperature unevenness correction device 61 includes a temperature unevenness correction amount determination unit 13, a temperature unevenness correction execution unit 63, a data driver 65, a gate driver 67 with a duty modulation function, and a display panel 69 as main components.

Among these, the configuration of the temperature unevenness correction amount determination unit 13 is the same as that of the first embodiment (FIG. 3).
The temperature unevenness correction execution unit 63 includes a display data information detection unit 63A, a timing generator 63B, and a duty ratio adjustment unit 63C.
The display data information detection unit 63A detects an average value of gradation values of pixels constituting the light emitting surface in units of frames. The detection result is given to the duty ratio adjustment unit 63C.
The timing generator 63B receives an input display signal and generates a timing pulse necessary for driving each driver. For example, a scan pulse for a data driver, a scan pulse for a gate driver, and a duty pulse are generated.

The duty ratio adjustment unit 63C is a processing device that adjusts the length of the ON period of the duty pulse in accordance with the temperature unevenness correction amount.
FIG. 14 shows an example of the duty pulse used in the vertical usage mode. FIG. 14A shows a frame pulse that gives one frame period. FIG. 14B shows a duty pulse applied to the leading line located on the uppermost end side of the light emitting unit. FIG. 14C shows duty pulses applied to a line located near the center of the uppermost end and the lowermost end of the light emitting unit. FIG. 14D shows the duty pulse applied to the termination line located on the lowermost side of the light emitting unit.
As shown in FIG. 14, the duty pulse on-time (lighting time) is adjusted to be longer as the lowermost correction amount increases. A long on-time means that the heat generation time of the self-luminous element becomes long. For this reason, it becomes possible to compensate for the temperature drop due to air convection.

FIG. 15 shows an example of duty pulses used in the horizontal usage mode. FIGS. 15A to 15D correspond to FIGS. 14A to 14D. In the horizontal usage mode, temperature unevenness due to air convection does not occur, so the same duty pulse is used regardless of the difference in line position.
Actually, the correction amount given from the temperature unevenness correction amount determination unit 13 to the duty ratio adjustment unit 63C is 0 (zero).
FIG. 16 shows a structural example of a panel module including a data driver 65, a gate driver 67 with a duty modulation function, and a display panel 69.

The display panel 69 includes a light emitting area 69A (an area where the organic EL elements 69B are arranged in a matrix).
The pixel drive circuit includes a data driver 65 and a gate driver 67 with a duty modulation function. Here, the image driving circuit is formed in the periphery of the light emitting region.
The gate driver 67 with a duty modulation function includes a scanning gate driver 67A and a lighting time control gate driver 67B.

The organic EL element 69B corresponding to each pixel and its driving circuit (pixel driving circuit) 69C are arranged at the intersection of the data line 69D and the scanning line 69E. The pixel drive circuit 69C includes a data switch element T1, a capacitor C1, a current drive element T2, and a lighting switch element T3.
Among these, the data switch element T1 is used to control the timing of taking in the voltage value applied through the data line 69D. The capture timing is given line-sequentially through the scanning line 69E.
The capacitor C1 is used to hold the acquired voltage value for one frame. By using the capacitor C1, frame sequential driving is realized.

The current driving element T2 is used to supply a current corresponding to the voltage value of the capacitor C1 to the organic EL element 69B. The drive current is supplied from a current supply line 69F.
The lighting switch element T3 is used to control the supply of drive current to the organic EL element 69B. The lighting switch element T3 is arranged in series with respect to the drive current supply path. While the lighting switch element T3 is closed, the organic EL element 69B is lit. On the other hand, the organic EL element 69B is turned off while the lighting switch element T3 is open.
The lighting control line 69G supplies a duty pulse (FIGS. 14 and 15) for controlling the opening / closing operation of the lighting switch element T3.

The control voltage for the lighting control line 69G is supplied from the lighting time control gate driver 67B.
The control voltage used for controlling the lighting time is generated based on the duty pulse supplied from the duty ratio adjustment unit 63C to the lighting time control gate driver 67B.
In the case of the temperature unevenness correction apparatus according to this embodiment, the gradation information of the image displayed in the effective display area is not changed for temperature unevenness correction. Therefore, the gradation of the displayed screen is not impaired.

(B) Other Embodiments (a) In the above-described embodiments, the case where the self-luminous element is an organic EL element has been described. However, as long as the amount of heat generated by each pixel is a self-luminous element that is proportional to the amount of current flowing through each pixel, the present invention can be widely applied to display panels composed of other than organic EL elements.
(B) In the above-described embodiment, the case where the adjustment coefficient in the vertical usage mode is set to “1” and the adjustment coefficient in the horizontal usage mode is set to “0” has been described.
However, if the adjustment coefficient is a value in the range greater than 0 and less than 1, the maximum value may not be “1”, and the minimum value may not be “0”. In this case, the adjustment coefficient in the vertical usage mode may be set to the maximum value that satisfies this condition, and the adjustment coefficient in the horizontal usage mode may be set to the minimum value that satisfies this condition.

(C) In the above-described embodiment, it has been described that the inclination angle of the light emitting surface is detected after the reference correction amount is first read out.
However, the reading of the reference correction amount only needs to be executed before the adjustment of the reference correction amount using the adjustment coefficient determined according to the tilt angle.
(D) In the above-described embodiment, the display device incorporating the temperature unevenness correction device has been described. This display device may be in the form of a single product or may be mounted as part of another image processing device.
For example, video cameras, digital cameras and other imaging devices (including not only camera units but also those integrated with a recording device), information processing terminals (portable computers, mobile phones, portable game machines) , Electronic notebook, etc.) and display devices for game machines.
(E) In the embodiment described above, the case where the temperature unevenness correction device is built in the display device has been described. However, the temperature distribution detection device may be mounted on the image processing device that supplies an input display signal to the display device. In this case, a method is adopted in which information on the tilt angle according to the usage mode of the display device is given to the image processing device.

(F) In the above-described embodiment, the case where the arithmetic unit is mounted as hardware has been described.
However, the function of this arithmetic unit may be realized by software processing.
(G) Although the functional configuration of the temperature unevenness correction apparatus has been described in the above-described embodiment, it is needless to say that an equivalent function can be realized as hardware or software.
Moreover, not only all the functions constituting the temperature unevenness correction apparatus are realized by hardware or software, but some of them may be realized by using hardware or software. That is, a combination of hardware and software may be used.
(H) Various modifications can be considered for the above-described embodiments within the scope of the gist of the invention. Various modifications and application examples created based on the description of the present specification are also conceivable.

It is a figure which shows the temperature nonuniformity which generate | occur | produces by the convection of air. It is a figure which shows the relationship between the distance from the light emission center, and surface temperature. It is a figure which shows the example of a form of a temperature nonuniformity correction apparatus. It is a figure which shows the usage example. It is a figure which shows the relationship between a screen position and a reference | standard correction amount. It is a figure which shows the relationship between a usage condition and an adjustment coefficient. It is a graph which shows the relationship between the inclination of a light emission surface, and an adjustment coefficient. It is a figure which shows the relationship between a screen position and the corrected amount after adjustment. It is a figure which shows the correction procedure of a temperature nonuniformity. It is a figure which shows the other form example of a temperature nonuniformity correction apparatus. It is a figure which shows the relationship between an effective display area and a dummy pixel area. It is a figure which shows the other form example of a temperature nonuniformity correction apparatus. It is a figure which shows the other form example of a temperature nonuniformity correction apparatus. It is a figure which shows the example of a duty pulse in a vertical use aspect. It is a figure which shows the example of a duty pulse in a horizontal use aspect. It is a figure which shows the structural example of the pixel circuit which can vary light emission time.

Explanation of symbols

11, 31, 51, 61 Temperature unevenness correction device 13 Temperature unevenness correction amount determination unit 13A Use inclination detection unit 13B Adjustment coefficient determination unit 13C Correction amount adjustment unit 13D Reference correction amount storage unit 15, 33, 53, 63 Temperature unevenness correction execution Unit 33A correction pattern generation unit 33B display data conversion unit 53A, 63A display data information detection unit 53B dummy pixel data generation unit 53C dummy pixel data addition unit 63B timing generator 63C duty ratio adjustment unit

Claims (7)

A method for determining a correction amount for correcting temperature unevenness in a light emitting surface in which self-emitting elements are arranged in a matrix,
A process of reading a reference correction amount set for correcting temperature unevenness at the lower part of the light emitting surface that occurs when the light emitting surface is installed in parallel with the vertical direction;
Processing to detect the tilt angle of the light emitting surface with respect to the vertical direction;
A process of determining an adjustment coefficient for the reference correction amount according to the magnitude of the inclination angle;
And a process for adjusting the reference correction amount with the determined adjustment coefficient. The temperature unevenness correction amount determination method according to claim 1,
The temperature unevenness correction amount determination method, wherein the adjustment coefficient is given in a range of 0 to 1. The temperature unevenness correction amount determination method according to claim 2,
The adjustment coefficient is set to 1 or the maximum value when the light emitting surface is installed in parallel with the vertical direction, the value decreases as the light emitting surface is inclined in the horizontal direction from the vertical direction, and the light emitting surface is inclined in the horizontal direction. A temperature unevenness correction amount determination method, characterized in that the temperature unevenness correction amount is set to 0 or a minimum value. A light emitting surface in which self-emitting elements are arranged in a matrix;
A storage area for storing a reference correction amount set for correcting temperature unevenness at the lower part of the light emitting surface that occurs when the light emitting surface is installed parallel to the vertical direction;
An inclination angle detector for detecting an inclination angle of the light emitting surface with respect to the vertical direction;
An adjustment coefficient determining unit for determining an adjustment coefficient for the reference correction amount according to the magnitude of the inclination angle;
And a correction amount adjusting unit that adjusts the reference correction amount with the determined adjustment coefficient. A device for determining a correction amount for correcting temperature unevenness in a light emitting surface in which self-emitting elements are arranged in a matrix,
A storage area for storing a reference correction amount set for correcting temperature unevenness at the lower part of the light emitting surface that occurs when the light emitting surface is installed parallel to the vertical direction;
An inclination angle detector for detecting an inclination angle of the light emitting surface with respect to the vertical direction;
An adjustment coefficient determining unit for determining an adjustment coefficient for the reference correction amount according to the magnitude of the inclination angle;
A temperature unevenness correction amount determination device comprising: a correction amount adjustment unit that adjusts the reference correction amount with the determined adjustment coefficient. An apparatus for correcting temperature unevenness in a light emitting surface in which self-emitting elements are arranged in a matrix,
A storage area for storing a reference correction amount set for correcting temperature unevenness at the lower part of the light emitting surface that occurs when the light emitting surface is installed parallel to the vertical direction;
An inclination angle detector for detecting an inclination angle of the light emitting surface with respect to the vertical direction;
An adjustment coefficient determining unit for determining an adjustment coefficient for the reference correction amount according to the magnitude of the inclination angle;
A correction amount adjustment unit that adjusts the reference correction amount with the determined adjustment coefficient;
A temperature unevenness correction apparatus comprising: a correction execution unit that corrects temperature unevenness under the light emitting surface with the determined correction amount. A process of reading a reference correction amount set for correcting temperature unevenness at the lower part of the light emitting surface that occurs when the light emitting surface is installed in parallel with the vertical direction;
Processing to detect the tilt angle of the light emitting surface with respect to the vertical direction;
A process of determining an adjustment coefficient for the reference correction amount according to the magnitude of the inclination angle;
And a process of adjusting the reference correction amount with the determined adjustment coefficient, and determining a correction amount for correcting temperature unevenness in a light emitting surface in which self-emitting elements are arranged in a matrix. program.

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