JP2010152065A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately measure light emission luminance of each pixel to be used when each pixel is corrected without inhibiting propagation of light from each pixel in image display. <P>SOLUTION: A light receiving sensor 3 measures the light emission luminance of a noticing pixel in an EL panel 2. In the light receiving sensor 3, a display surface of the EL panel 2 is arranged on a light receiving surface 71 which is a different surface. Arrangement of the light receiving surface 71 and the EL panel 2 is made into a first state that an angle θ to be formed by a normal vector of the light receiving surface 71 and a normal vector of the EL panel 2 is within a range of a predetermined threshold and a second state that the angle θ is out of the range of the predetermined threshold. The arrangement of the light receiving surface 71 and the EL panel 2 is made into the first state when the light receiving sensor 3 measures the light emission luminance, and made into the second state in normal light emission. The present invention is applicable, for example, to a panel using a self-luminous element. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, and in particular, can appropriately measure the light emission luminance of each pixel used when correcting each pixel without hindering the propagation of light from each pixel during image display. The present invention relates to a display device.

  In recent years, development of a planar self-luminous panel (EL panel) using an organic EL (Electro Luminescent) device as a light emitting element has become active. An organic EL device is a device having a diode characteristic and utilizing a phenomenon of emitting light when an electric field is applied to an organic thin film. The organic EL device is a self-luminous element that emits light by itself because it is driven at an applied voltage of 10 V or less and has low power consumption. For this reason, the organic EL device has a feature that it does not require a lighting member and can be easily reduced in weight and thickness. In addition, the response speed of the organic EL device is as high as several μs. Therefore, the EL panel has a characteristic that no afterimage occurs when displaying a moving image.

  Among planar self-luminous panels using organic EL devices as pixels, active matrix panels in which thin film transistors are integrated and formed as driving elements are being actively developed. Active matrix type flat self-luminous panels are disclosed in, for example, the following Patent Documents 1 to 5.

JP 2003-255856 A JP 2003-271095 A JP 2004-133240 A JP 2004-029791 A Japanese Patent Laid-Open No. 2004-093682

  Incidentally, the organic EL device also has a characteristic that the luminance efficiency decreases in proportion to the light emission amount and the light emission time. Since the light emission luminance of the organic EL device is represented by the product of the current value and the luminance efficiency, a decrease in luminance efficiency leads to a decrease in light emission luminance. As the contents displayed on the screen, images that perform uniform display in each pixel are rare, and the amount of light emission is generally different for each pixel. Therefore, due to the difference in the amount of light emission and the light emission time in the past, the degree of decrease in the light emission luminance is different for each pixel even under the same driving condition. As a result, a phenomenon in which burn-in occurs in a pixel in which the degree of decrease in luminance efficiency is significant compared to others (hereinafter referred to as a burn-in phenomenon) is visually recognized by the user.

  For this reason, some display devices equipped with organic EL devices perform corrections (hereinafter referred to as burn-in corrections) that unify the luminance efficiencies for each pixel where the luminance efficiencies vary. Is also present. Note that when performing burn-in correction, it is necessary to measure the light emission luminance for each pixel. In order to measure the light emission luminance for each pixel, for example, a sensor (hereinafter referred to as a light receiving sensor) that receives the light emission luminance needs to be disposed on the surface of the EL panel. However, when the light receiving sensor is arranged on the surface of the EL panel, the light receiving sensor becomes an obstacle when each pixel emits light for displaying an image on the EL panel. That is, from the viewpoint of the viewer, the light receiving sensor becomes a factor that hinders propagation of light emitted from each pixel (propagation to its own eyes).

  The present invention has been made in view of such a situation, and the light emission luminance of each pixel used when correcting each pixel without impeding the propagation of light from each pixel at the time of image display. It makes it possible to measure appropriately.

  A display device according to an aspect of the present invention includes a panel on which a plurality of pixels that emit light by a self-luminous element are arranged, a light receiving sensor that measures light emission luminance of the pixels that form the panel, and a surface different from the panel. A light-receiving surface on which the light-receiving sensor is disposed, and the light-receiving sensor has a light emission luminance of the pixel with respect to the display surface of the panel as an arrangement state of the light-receiving surface and the display surface of the panel. The light-receiving surface is disposed at a position where the light-receiving sensor cannot measure the light emission luminance of the pixel with respect to the display surface of the panel in the first state where the light-receiving surface is disposed at a position where the light-receiving sensor can measure A second state.

  Of the angle θ formed by the normal vector of the light receiving surface and the normal vector of the panel, a predetermined angle at which the light receiving sensor can measure the light emission luminance of the pixel is set as a threshold value, and the angle θ is within the threshold value range. Is adopted as the first state, and the state in which the angle θ is outside the range of the threshold is adopted as the second state.

  A cover detachably attached to the panel is further provided, and one surface constituting the cover is adopted as the light receiving surface.

  A hinge portion that rotates the light receiving surface so that the light receiving surface can be opened and closed with respect to the display surface of the panel is further provided, and a state in which the light receiving surface is open with respect to the display surface of the panel is adopted as a first state. And the state where the said light-receiving surface is closed with respect to the display surface of the said panel is employ | adopted as a 2nd state.

  When one of the pixels constituting the panel is a target pixel, the light emission luminance of the target pixel is measured by the light receiving sensor, and an analog light reception signal is output, the light reception signal of the target pixel is set to a predetermined value. An amplification unit that amplifies at a gain of, a conversion unit that converts the light reception signal amplified by the amplification unit into digital data and outputs the digital data, and a time-dependent deterioration based on the digital data output from the conversion unit And a signal processing unit that calculates correction data for luminance reduction, corrects a video signal corresponding to the target pixel based on the correction data, and supplies the corrected video signal to the target pixel.

  For measuring light emission luminance of pixels dedicated to light emission luminance measurement arranged on the same surface as the panel and different from the panel, and pixels dedicated to light emission luminance measurement arranged on the light receiving surface. And a light receiving sensor.

  In one aspect of the present invention, a panel in which a plurality of pixels that emit light by a self-luminous element are arranged in a matrix, a light receiving sensor that measures light emission luminance of the pixels constituting the panel, and a surface different from the panel And the light-receiving surface which arrange | positions the said light-receiving sensor is provided. As the arrangement state of the light receiving surface and the display surface of the panel, the light receiving surface is arranged at a position where the light receiving sensor can measure the light emission luminance of the pixel with respect to the display surface of the panel. And a second state in which the light receiving surface is disposed at a position where the light receiving sensor cannot measure the light emission luminance of the pixel with respect to the display surface of the panel.

  According to one aspect of the present invention, it is possible to appropriately measure the light emission luminance of each pixel used when correcting each pixel without inhibiting the propagation of light from each pixel during image display.

<Embodiment of the present invention>
[Configuration of display device]
FIG. 1 is a block diagram showing a configuration example of an embodiment of a display device to which the present invention is applied.

  The display device 1 of FIG. 1 is configured to include an EL panel 2, a sensor group 4 including a plurality of light receiving sensors 3, and a control unit 5. The EL panel 2 is configured as a panel using an organic EL device as a self-luminous element. The light receiving sensor 3 is configured as a sensor for measuring the light emission luminance of the EL panel 2. The control unit 5 controls the display of the EL panel 2 based on the light emission luminance of the EL panel 2 obtained from the plurality of light receiving sensors 3.

[Configuration of EL panel]
FIG. 2 is a block diagram illustrating a configuration example of the EL panel 2.

  The EL panel 2 is configured to include a pixel array unit 102, a horizontal selector (HSEL) 103, a write scanner (WSCN) 104, and a power supply scanner (DSCN) 105. The pixel array unit 102 includes N × M pixels (N and M are integer values of 1 or more independent from each other) of pixels (pixel circuits) 101- (1,1) to 101- (N, M) in a matrix. Arranged and configured. A horizontal selector (HSEL) 103, a write scanner (WSCN) 104, and a power supply scanner (DSCN) 105 operate as a drive unit that drives the pixel array unit 102.

  The EL panel 2 also includes M scanning lines WSL10-1 to 10-M, M power supply lines DSL10-1 to 10-M, and N video signal lines DTL10-1 to 10-N.

  In the following description, the scanning lines WSL10-1 to 10-M are simply referred to as scanning lines WSL10 when it is not necessary to distinguish them. Further, when it is not necessary to distinguish each of the video signal lines DTL10-1 to 10-N, they are simply referred to as a video signal line DTL10. Similarly, the pixels 101- (1,1) to 101- (N, M) and the power supply lines DSL10-1 to 10-M are also referred to as the pixel 101 and the power supply line DSL10.

  Among the pixels 101- (1,1) to 101- (N, M), the pixels 101- (1,1) to 101- (N, 1) in the first row are scanned by the scanning line WSL10-1. 104 and the power supply scanner 105 are connected to the power supply line DSL10-1. Among the pixels 101- (1,1) to 101- (N, M), the pixels 101- (1, M) to 101- (N, M) in the Mth row are the scanning lines WSL10-M. The light scanner 104 is connected to the power supply scanner 105 via the power supply line DSL10-M. The same applies to the other pixels 101 arranged in the row direction of the pixels 101- (1, 1) to 101- (N, M).

  Among the pixels 101- (1,1) to 101- (N, M), the pixels 101- (1,1) to 101- (1, M) in the first column are video signal lines DTL10-1. Is connected to the horizontal selector 103. Among the pixels 101- (1,1) to 101- (N, M), the pixels 101- (N, 1) to 101- (N, M) in the Nth column are horizontal by the video signal line DTL10-N. The selector 103 is connected. The same applies to the other pixels 101 arranged in the column direction of the pixels 101- (1, 1) to 101- (N, M).

  The write scanner 104 sequentially supplies control signals to the scanning lines WSL10-1 to 10-M in a horizontal cycle (1H) to scan the pixels 101 line by line. The power supply scanner 105 supplies a power supply voltage of the first potential (Vcc described later) or the second potential (Vss described later) to the power supply lines DSL10-1 to 10-M in accordance with the line sequential scanning. The horizontal selector 103 switches the signal potential Vsig corresponding to the video signal and the reference potential Vofs within each horizontal period (1H) in accordance with the line sequential scanning, and supplies them to the columnar video signal lines DTL10-1 to 10-M. To do.

[Array Configuration of Pixels 101]
FIG. 3 shows an arrangement of colors emitted by the pixels 101 of the EL panel 2.

  Each pixel 101 of the pixel array unit 102 corresponds to a so-called sub-pixel (sub-pixel) that emits one of red (R), green (G), and blue (B), and is in the row direction (the horizontal direction in the drawing). ), The three pixels 101 of red, green, and blue constitute one pixel as a display unit.

  3 is different from FIG. 2 in that the write scanner 104 is arranged on the left side of the pixel array unit 102 and the scanning line WSL10 and the power supply line DSL10 are connected from the lower side of the pixel 101. The horizontal selector 103, the write scanner 104, the power supply scanner 105, and the wiring connected to each pixel 101 can be arranged at appropriate positions as necessary.

[Detailed Circuit Configuration of Pixel 101]
FIG. 4 is a block diagram showing a detailed circuit configuration of the pixel 101 by enlarging one pixel 101 of the N × M pixels 101 included in the EL panel 2.

  In FIG. 4, each of the scanning line WSL10, the video signal line DTL10, and the power supply line DSL10 connected to the pixel 101 is as follows, corresponding to FIG. That is, the scanning line WSL10- (n, m) for the pixel 101- (n, m) (n = 1, 2,..., N, m = 1, 2,..., M) in FIG. Each of the video signal line DTL10- (n, m) and the power supply line DSL10- (n, m) corresponds.

  The pixel 101 in FIG. 4 includes a sampling transistor 31, a driving transistor 32, a storage capacitor 33, and a light emitting element. The gate of the sampling transistor 31 is connected to the scanning line WSL10, the drain of the sampling transistor 31 is connected to the video signal line DTL10, and the source is connected to the gate g of the driving transistor 32.

  One of the source and the drain of the driving transistor 32 is connected to the anode of the light emitting element 34, and the other is connected to the power supply line DSL10. The storage capacitor 33 is connected to the gate g of the driving transistor 32 and the anode of the light emitting element 34. The cathode of the light emitting element 34 is connected to a wiring 35 set at a predetermined potential Vcat. The potential Vcat is at the GND level, and therefore the wiring 35 is a ground wiring.

  The sampling transistor 31 and the driving transistor 32 are both N-channel transistors. Therefore, the sampling transistor 31 and the driving transistor 32 can be made of amorphous silicon that can be made at a lower cost than low-temperature polysilicon. Thereby, the manufacturing cost of the pixel circuit can be further reduced. Of course, the sampling transistor 31 and the driving transistor 32 may be made of low-temperature polysilicon or single crystal silicon.

  The light emitting element 34 is composed of an organic EL element. The organic EL element is a current light emitting element having diode characteristics. Therefore, the light emitting element 34 emits light with a gradation corresponding to the supplied current value Ids.

  In the pixel 101 configured as described above, the sampling transistor 31 is turned on (conducted) in response to the control signal from the scanning line WSL10, and the video of the signal potential Vsig corresponding to the gradation is supplied via the video signal line DTL10. Sampling the signal. The storage capacitor 33 stores and holds charges supplied from the horizontal selector 103 via the video signal line DTL10. The driving transistor 32 receives supply of current from the power supply line DSL10 at the first potential Vcc, and flows (supply) the driving current Ids to the light emitting element 34 in accordance with the signal potential Vsig held in the storage capacitor 33. When a predetermined drive current Ids flows through the light emitting element 34, the pixel 101 emits light.

  The pixel 101 has a threshold correction function. The threshold correction function is a function for holding the voltage corresponding to the threshold voltage Vth of the driving transistor 32 in the storage capacitor 33. By exerting the threshold correction function, it is possible to cancel the influence of the threshold voltage Vth of the driving transistor 32 that causes the variation of each pixel of the EL panel 2.

  Further, the pixel 101 has a mobility correction function in addition to the above-described threshold correction function. The mobility correction function is a function of adding correction for the mobility μ of the driving transistor 32 to the signal potential Vsig when the signal potential Vsig is held in the storage capacitor 33.

  Furthermore, the pixel 101 has a bootstrap function. The bootstrap function is a function of interlocking the gate potential Vg with the fluctuation of the source potential Vs of the driving transistor 32. By exhibiting the bootstrap function, the voltage Vgs between the gate and the source of the driving transistor 32 can be kept constant.

[Description of Operation of Pixel 101]
FIG. 5 is a timing chart for explaining the operation of the pixel 101.

  FIG. 5 shows changes in potentials of the scanning line WSL10, the power supply line DSL10, and the video signal line DTL10 with respect to the same time axis (horizontal direction in the drawing), and changes in the gate potential Vg and source potential Vs of the driving transistor 32 corresponding thereto. Show.

In FIG. 5, the period up to time t ₁ is the light emission period T ₁ during which light is emitted in the previous horizontal period (1H).

From time t ₁ to time t ₄ when the light emission period T ₁ ends, a threshold correction preparation period T _{2 in} which the gate potential Vg and the source potential Vs of the driving transistor 32 are initialized to prepare for the threshold voltage correction operation. is there.

In the threshold value correction preparation period T _2, at time t _1, the power supply scanner 105 switches the potential of the power supply line DSL10 from the first potential Vcc is a high potential to the second potential Vss is low potential. At time t _2, the horizontal selector 103 switches the potential of the video signal line DTL10 from the signal potential Vsig to the reference potential Vofs. Next, at time t ₃ , the write scanner 104 switches the potential of the scanning line WSL10 to a high potential and turns on the sampling transistor 31. As a result, the gate potential Vg of the driving transistor 32 is reset to the reference potential Vofs, and the source potential Vs is reset to the second potential Vss of the video signal line DTL10.

From time t ₄ to time t ₅ is a threshold correction period T ₃ in which the threshold correction operation is performed. In the threshold correction period T ₃ , at time t ₄ , the power supply scanner 105 switches the potential of the power supply line DSL 10 to the high potential Vcc, and a voltage corresponding to the threshold voltage Vth is between the gate and the source of the driving transistor 32. To the storage capacitor 33 connected to the.

In the writing + mobility correction preparation period T ₄ from time t ₅ to time t ₇ , the potential of the scanning line WSL 10 is temporarily switched from a high potential to a low potential. At time t ₆ before the time t _7, the horizontal selector 103 is switched to the signal potential Vsig corresponding to the gradation potential of the video signal line DTL10 from the reference potential Vofs.

Then, in the writing + mobility correction period T ₅ from time t ₇ to time t ₈ , video signal writing and mobility correction operation are performed. That is, between the time t ₇ to the time t _8, the potential of the scanning line WSL10 is set to a high potential, Thus, the storage capacitor 33 in the form of a signal potential Vsig corresponding to the video signal is added up to the threshold voltage Vth Written. In addition, the mobility correction voltage ΔV _μ is subtracted from the voltage held in the storage capacitor 33.

Write + in the mobility correction period T ₅ after the end of the time t _8, the potential of the scanning line WSL10 is set to a low potential, thereafter, as a light-emitting period T _6, the light emitting element 34 in the light emitting luminance corresponding to the signal voltage Vsig is Emits light. Since the signal voltage Vsig is adjusted by the voltage corresponding to the threshold voltage Vth and the mobility correction voltage ΔV _μ , the light emission luminance of the light emitting element 34 varies in the threshold voltage Vth and mobility μ of the driving transistor 32. Will not be affected.

Note that a bootstrap operation is performed at the beginning of the light emission period T ₆ , and the gate potential Vg and the source potential of the driving transistor 32 are maintained while the gate-source voltage Vgs = Vsig + Vth−ΔV _μ of the driving transistor 32 is kept constant. Vs rises.

At time t ₉ after a predetermined time from the time t _8, the potential of the video signal line DTL10 is dropped from the signal potential Vsig to the reference potential Vofs. In FIG. 5, the period from time t ₂ to time t ₉ corresponds to the horizontal period (1H).

  As described above, each pixel 101 of the EL panel 2 can emit light from the light emitting element 34 without being affected by variations in the threshold voltage Vth and mobility μ of the driving transistor 32.

[Description of another example of the operation of the pixel 101]
FIG. 6 is a timing chart for explaining another example of the operation of the pixel 101.

  In the example of FIG. 5 described above, the threshold correction operation is performed once in the 1H period. However, the 1H period is short, and it may be difficult to perform the threshold correction operation within the 1H period. In such a case, the threshold correction operation can be performed a plurality of times over a plurality of 1H periods. It can also be done.

In the example of FIG. 6, the threshold correction operation is performed in a continuous 3H period. That is, in the example of FIG. 6, the threshold correction period T ₃ is divided into three times. The other operations of the pixel 101 are the same as those in the example of FIG. Therefore, description of these operations is omitted.

[Explanation of burn-in correction control]
By the way, the organic EL device has a characteristic that the light emission luminance decreases in proportion to the light emission amount and the light emission time. For this reason, when a predetermined time elapses, the degree of decrease in luminance efficiency of each pixel 101 varies depending on the light emission amount and the light emission time until that time even under the same driving conditions. For this reason, the variation in the luminance efficiency of each pixel 101 causes a pixel 101 whose degree of decrease in luminance efficiency is significant compared to others. As a result, a phenomenon in which burn-in occurs in the pixel 101 (hereinafter referred to as a burn-in phenomenon) is visually recognized by the user. Therefore, the display device 1 performs correction (hereinafter referred to as burn-in correction) for unifying the luminance efficiencies for each pixel 101 in which the luminance efficiency is variously reduced.

[Example of Functional Configuration of Display Device 1 Necessary for Executing Burn-in Correction Control]

  FIG. 7 is a functional block diagram illustrating a functional configuration example of the display device 1 necessary for executing the burn-in correction control.

  The light receiving sensor 3 is disposed at a position facing the display surface of the EL panel 2. Further, the EL panel 2 is divided into a plurality of regions, and one light receiving sensor 3 is disposed to face the EL panel 2 for each region. That is, a sensor group 4 is configured by a plurality of light receiving sensors 3 that are equally arranged at a rate of one per region. Further, the sensor group 4 is disposed on a predetermined surface 71 (hereinafter referred to as a light receiving surface 71) different from the display surface of the EL panel 2. A specific example of the light receiving surface 71 will be described later with reference to FIGS. For example, in the example of FIG. 7, the sensor group 4 includes nine light receiving sensors 3. Of course, the number of the light receiving sensors 3 arranged facing the EL panel 2 is not limited to the example of FIG.

  Each of the light receiving sensors 3 measures the light emission luminance of each pixel 101 in the area that it is in charge of. Specifically, each pixel 101 in a predetermined area is sequentially set as a pixel to be noted as a processing target (hereinafter referred to as a noticed pixel P). The target pixel P emits light with a luminance of a predetermined gradation. Then, the light emission luminance of the target pixel P is sequentially measured by the light receiving sensor 3 in charge of the predetermined region. That is, the light receiving sensor 3 receives light from the target pixel P, generates an analog light receiving signal (voltage signal) corresponding to the light receiving luminance, and supplies the analog light receiving signal (voltage signal) to the control unit 5.

  In the example of FIG. 7, the control unit 5 is configured to include an amplification unit 51, an A / D conversion unit 52, and a signal processing unit 53.

  The amplification unit 51 amplifies the analog light reception signal supplied from each light reception sensor 3 and supplies the amplified signal to the A / D conversion unit 52. The A / D conversion unit 52 converts the amplified analog light reception signal supplied from the amplification unit 51 into a digital signal (luminance data) and supplies the signal to the signal processing unit 53.

  The memory 61 of the signal processing unit 53 stores initial values of luminance data (luminance data at the time of shipment) for each pixel 101 of the pixel array unit 102 as initial data. When the digital data for the target pixel P is supplied from the A / D conversion unit 52, the signal processing unit 53, based on the digital data, the luminance data of the target pixel P after a predetermined period (after deterioration with time). Recognize The signal processing unit 53 calculates a luminance reduction amount with respect to initial data (initial luminance value) of luminance values after a predetermined period has elapsed for the target pixel P. Then, the signal processing unit 53 calculates correction data for correcting the luminance decrease for the target pixel P based on the luminance decrease amount. Such correction data is calculated for each pixel 101 and stored in the memory 61 by sequentially setting each pixel 101 of the pixel array unit 102 to the target pixel P.

  In addition, the part which calculates the above-mentioned correction data among the signal processing parts 53 can be comprised by signal processing IC, such as FPGA (Field Programmable Gate Alley) and ASIC (Application Specific Integrated Circuit).

  As described above, the memory 61 stores the correction data of each pixel 101 when the predetermined period has elapsed. The memory 61 also stores initial data for each pixel 101. In addition, the memory 61 also stores various information necessary for realizing various processes described later.

  The signal processing unit 53 also controls the horizontal selector 103 to supply the signal potential Vsig corresponding to the video signal input to the display device 1 for each pixel 101. At this time, the signal processing unit 53 reads the correction data of each pixel 101 from the memory 61, and determines the signal potential Vsig corrected for the decrease in luminance due to deterioration with time.

[Initial data acquisition processing of pixel 101]
FIG. 8 is a flowchart for explaining an example of a series of processing (hereinafter referred to as initial data acquisition processing) up to acquisition of initial data among processing executed by the display device 1.

The initial data acquisition process of FIG. 8 is executed in parallel for each area into which the EL panel 2 is divided, for example. That is, the initial data acquisition process of FIG. 8 is executed in parallel for each light receiving sensor 3.

  In step S <b> 1, the signal processing unit 53 sets a pixel 101 from which luminance data is not acquired among the pixels 101 constituting the region as a target pixel P.

  In step S2, the signal processing unit 53 causes the target pixel P to emit light at a predetermined gradation (brightness) determined in advance.

  In step S <b> 3, the light reception sensor 3 outputs an analog light reception signal (voltage signal) corresponding to the light reception luminance of the target pixel P to the amplification unit 51 of the control unit 5.

  In step S <b> 4, the amplification unit 51 amplifies the light reception signal of the light reception sensor 3 with a predetermined amplification factor and supplies the amplified signal to the A / D conversion unit 52.

  In step S <b> 5, the A / D conversion unit 52 converts the amplified analog light reception signal into luminance data of the pixel of interest P, which is a digital signal, and supplies it to the signal processing unit 53.

  In step S <b> 6, the signal processing unit 53 stores the luminance data of the target pixel P in the memory 61 as initial data.

  In step S7, the signal processing unit 53 determines whether or not luminance data has been acquired for all the pixels 101 in the region. If it is determined in step S7 that the luminance data has not been acquired for all the pixels 101 in the region, the process returns to step S1, and the loop process of steps S1 to S7 is repeated. That is, each of the pixels 101 constituting the area is sequentially set as the target pixel P, and the loop data is repeatedly executed, whereby initial data of all the pixels 101 constituting the area is acquired and stored in the memory 61. .

  Thereby, in step S7, it is determined that the luminance data has been acquired for all the pixels 101 in the region, and the initial data acquisition process ends.

[Measurement example of light emission luminance by the light receiving sensor 3]
FIG. 9 is a diagram for explaining an example of a measurement order of the light emission luminance of the pixel 101 by the light receiving sensor 3.

  In FIGS. 9A to 9G, an area composed of 5 × 5 pixels 101 is shown. The light receiving sensor 3 is arranged to face the center of this region.

  FIG. 9A shows the setting order of the target pixel P in the burn-in correction control. That is, the target pixel P is set in the process of step S1 of FIG. 8 in accordance with the setting order shown in A of FIG. Specifically, when the processing target row is i row (in the example of FIG. 9, i is any integer value from 1 to 5), each of the five pixels 101 arranged in the i row. Are sequentially set as the target pixel P in the order from the pixel 101 at the left end (first column) to the pixel 101 at the right end (fifth column). Then, when the pixel 101 at the right end (fifth column) of i row is set as the target pixel P, the processing target row transitions to the next i + 1 row, and the target pixel P is changed in the same order as the i row. It is set sequentially.

  In this case, in the burn-in correction control, the signal processing unit 53 causes only the target pixel P to emit light with a predetermined gradation. That is, the signal processing unit 53 extinguishes the other 24 pixels 101. In the initial data acquisition process of FIG. 8 described above, the process of step S2 is executed for the pixel 101 set as the target pixel P.

  That is, as shown in FIG. 9B, first, the first row becomes the processing target row, and the pixel 101 in the first column becomes the target pixel P. Therefore, only the target pixel P in the first row and the first column emits light at a predetermined gradation in the process of step S2 in FIG. Then, in the process of step S <b> 3, the light receiving sensor 3 outputs a light receiving signal (voltage signal) corresponding to the light receiving luminance of the target pixel P to the control unit 5. In the processing of steps S4 to S6, the control unit 5 calculates the luminance data of the target pixel P based on the light reception signal of the target pixel P, and stores it in the memory 61 as initial data.

  Thereafter, it is determined NO in the process of step S7, and the process returns to step S1. Then, in the process of step S1, as shown in FIG. 9C, the signal processing unit 53 causes the pixel 101 on the right side of the pixel 101 in the first row and the first column, which has been the target pixel P so far, that is, The pixel 101 in the first row and the second column is set as the target pixel P. Therefore, only the target pixel P in the first row and the second column emits light at a predetermined gradation in the process of step S2. Then, in the process of step S <b> 3, the light receiving sensor 3 outputs a light receiving signal (voltage signal) corresponding to the light receiving luminance of the target pixel P to the control unit 5. In the processing of steps S4 to S6, the control unit 5 calculates the luminance data of the target pixel P based on the light reception signal of the target pixel P, and stores it in the memory 61 as initial data.

  Thereafter, the loop processing of steps S1 to S7 is repeatedly executed. Then, as shown in D to G of FIG. 9, the target pixel P is sequentially set in the above-described order, and the light receiving signal of the target pixel P is output from the light receiving sensor 3. As a result, the luminance data of the target pixel P is calculated based on the light reception signal of the target pixel P, and is stored in the memory 61 as initial data.

[Correction data acquisition processing of pixel 101]
FIG. 10 is a process executed after a predetermined period has elapsed since the initial data process of FIG. 8 was performed, and a series of processes (hereinafter referred to as correction data acquisition process) until acquiring correction data at the time when the predetermined period has elapsed. It is a flowchart explaining an example. The correction data acquisition process is also executed in parallel for each area into which the EL panel 2 is divided, similarly to the initial data process of FIG.

  Since the processing of steps S21 to S25 is the same as the processing of steps S1 to S5 of FIG. 8 described above, description thereof will be omitted. That is, the luminance data of the pixel of interest P is acquired by the processing in steps S21 to S25 under the same conditions as the initial data acquisition processing.

  In step S <b> 26, the signal processing unit 53 acquires initial data of the target pixel P from the memory 61.

  In step S <b> 27, the signal processing unit 53 calculates a luminance decrease amount with respect to the initial data of the luminance data of the target pixel P.

  In step S <b> 28, the signal processing unit 53 calculates correction data for the target pixel P based on the luminance reduction amount of the target pixel P and stores the correction data in the memory 61.

  In step S29, the signal processing unit 53 determines whether correction data has been acquired for all the pixels 101 in the region. If it is determined in step S29 that correction data has not yet been acquired for all the pixels 101 in the region, the process returns to step S21, and the loop process of steps S21 to S29 is repeated. That is, each pixel 101 constituting the area is sequentially set as the target pixel P, and the loop data is repeatedly executed, whereby correction data of all the pixels 101 constituting the area is acquired and stored in the memory 61. The

  That is, in the correction data acquisition process, the target pixel P is set in the order shown in A of FIG. Then, as shown in B to G of FIG. 9, each pixel 101 set as the target pixel P is sequentially emitted, whereby each correction data is acquired and stored in the memory 61.

  When the correction data is stored in the memory 61 for all the pixels 101 in the region, it is determined as YES in Step S29, and the correction data acquisition process ends.

  As described above, after the initial data acquisition process of FIG. 8 is executed and the correction data acquisition process of FIG. 10 is executed after a predetermined time has elapsed, the correction data for each pixel 101 of the pixel array unit 102 is stored in the memory 61. Is done. That is, thereafter, every time correction data acquisition processing is executed, correction data is updated and stored in the memory 61.

  As a result, under the control of the signal processing unit 53, the signal potential Vsig in which the luminance reduction due to deterioration with time is corrected by the correction data as the signal potential of the video signal is supplied to each pixel 101 of the pixel array unit 102. Become. That is, the signal processing unit 53 can control the horizontal selector 103 so as to supply the pixel 101 with the signal potential Vsig obtained by adding the potential based on the correction data as the signal potential of the video signal input to the display device 1. become.

  The correction data stored in the memory 61 may be a value that multiplies the signal potential of the video signal input to the display device 1 by a predetermined ratio, or a value that offsets the predetermined voltage value. Good. It can also be stored as a correction table corresponding to the signal potential of the video signal input to the display device 1. That is, the form of the correction data stored in the memory 61 is not particularly limited.

[Arrangement example of light receiving sensor 3]
When the display device 1 performs burn-in correction control, each pixel 101 constituting the EL panel 2 emits light for the purpose of generating its own correction data. At this time, light from the target pixel P is received by the light receiving sensor 3. Therefore, hereinafter, such time is referred to as light reception time. In other words, when receiving light, the light receiving sensor 3 needs to be disposed at a position where light from each pixel 101 can be received. Therefore, at the time of light reception, the light receiving sensor 3 is disposed at a position facing the display surface of the EL panel 2 as described above with reference to FIG.

  On the other hand, when the display device 1 does not execute the burn-in correction control, each pixel 101 constituting the EL panel 2 emits light for the purpose of displaying an image on the EL panel 2. Hereinafter, such time is referred to as normal light emission. During normal light emission, the light receiving sensor 3 does not need to receive light from the target pixel P by the light receiving sensor 3. In other words, at the time of normal light emission, the light receiving sensor 3 does not need to be disposed at a position where light from each pixel 101 can be received. Rather, if it is arranged at a position facing the display surface of the EL panel 2, the light receiving sensor 3 becomes an obstacle to light emission of each pixel 101. That is, in such a case, from the viewpoint of the viewer, the light receiving sensor 3 becomes a factor that hinders the propagation of light emitted from each pixel 101 (propagation to its own eyes).

  Accordingly, the inventors have invented a technique of making the arrangement position of the light receiving sensor 3 variable so that the arrangement position of the light receiving sensor 3 at the time of light reception is different from the arrangement position of the light receiving sensor 3 at the time of normal light emission. . Hereinafter, this method is referred to as a light receiving sensor arrangement position variable method.

  In order to realize the light receiving sensor arrangement position method, the light receiving sensor 3 is not disposed on the EL panel 2, but is disposed on the light receiving surface 71 described above with reference to FIG. The In this case, by changing the arrangement relationship between the light receiving surface 71 and the EL panel 2, the light receiving sensor arrangement position changing method is realized.

  In other words, by configuring the display device 1 so as to have the following first state and second state, the light receiving sensor arrangement position varying method is realized. The first state refers to a state in which the light receiving surface 71 is disposed at a position where the light receiving sensor 3 can measure the light emission luminance of the pixel 101 with respect to the display surface of the EL panel 2. The second state refers to a state in which the light receiving surface 71 is disposed at a position where the light receiving sensor 3 cannot measure the light emission luminance of the pixel 101 with respect to the display surface of the EL panel 2. In this case, by changing the state of the display device 1 to the first state at the time of light reception and to the second state at the time of normal light emission, the light receiving sensor arrangement position varying method is realized.

  Hereinafter, the display device 1 to which the light receiving sensor arrangement position variable method is applied will be described in more detail.

FIG. 11 shows an example of the arrangement relationship between the EL panel 2 and the light receiving surface 71 in the display device 1. In FIG. 11, a vector V ₇₁ indicates a unit vector in the normal direction of the light receiving surface 71. Therefore, hereinafter, a vector V _71, referred to as the normal vector V ₇₁ of the light-receiving surface 71. A vector V ₂ indicates a unit vector in the normal direction of the display surface of the EL panel 2. Therefore, hereinafter, a vector V _2, referred to as a normal vector V ₂ of the EL panel 2.

FIG. 11A shows an example of the first state among the arrangement states of the EL panel 2 and the light receiving surface 71 during light reception. In the example of Figure 11, A, the angle θ between normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2 so as to 180 degrees, the light receiving surface 71 is arranged.

FIG. 11B shows an example of the second state among the arrangement states of the EL panel 2 and the light receiving surface 71 during normal light emission. In the example of B of FIG. 11, the angle θ between normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2 such that 90 °, the light receiving surface 71 is arranged.

  However, the arrangement of the light receiving surface 71 is not limited to the example of FIG. Specifically, for example, as shown in FIG. 12, the light receiving surface 71 can be variably arranged.

  FIG. 12 shows the relationship between the arrangement of the EL panel 2 and the light receiving surface 71 in the display device 1.

Angle theta between the normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2, when the range of the threshold theta _TH1 to the threshold value theta _TH2, the light receiving sensor 3 disposed on the light receiving surface 71, It is assumed that light from the pixels 101 arranged on the EL panel 2 can be received.

In this case, when attention is paid to the arrangement position of the light receiving surface 71, the states that the display device 1 can take can be roughly divided into the following first state and second state. That is, the first state is a state in the range angle theta is the threshold theta _TH1 to the threshold theta _TH2 of the normal vector V ₂ of the normal vector V ₇₁ and EL panel 2 of the light-receiving surface 71. The second state refers to a state that is outside the range.

In this case, by changing the state of the display device 1 to the first state at the time of light reception and to the second state at the time of normal light emission, the light receiving sensor arrangement position varying method is realized. Here, "at the time of receiving the first state to cause transition" Rutowa, the angle threshold theta theta _TH1 to the threshold of the normal vector V ₂ of the normal vector V ₇₁ and EL panel 2 of the light-receiving surface 71 theta _TH2 The light receiving surface 71 is arranged so as to have an arbitrary angle within the range of. Further, "at the time of normal light emission shifts to the second state" and, the angle threshold theta theta _TH1 to the threshold theta _TH2 of the normal vector V ₂ of the normal vector V ₇₁ and EL panel 2 of the light-receiving surface 71 It means that the light receiving surface 71 is arranged so as to have an arbitrary angle outside the range.

  For example, by adopting a configuration in which the light receiving surface 71 can be removed from the EL panel 2, the state of the display device 1 can be changed between the first state and the second state. Specifically, for example, although not shown, among the surfaces of the cover that is detachable from the EL panel 2, a surface that faces the EL panel 2 when it is attached to the EL panel 2 may be adopted as the light receiving surface 71. it can. In this case, when receiving light, the cover is attached to the EL panel 2 to change the state of the display device 1 to the first state. Thereby, the display device 1 can execute the burn-in correction control.

  Further, at the time of normal light emission, the state of the display device 1 transitions to the second state by removing the cover from the EL panel 2. As a result, the light receiving sensor 3 disposed on the cover (light receiving surface 71) can achieve an effect of not hindering the operation of the display device 1 during normal light emission.

  By the way, the display device 1 to which the present invention is applied can be applied to a display that displays video signals input to various electronic devices or generated in various electronic devices as images or videos. . Furthermore, the display device 1 can be applied as a foldable electronic device display. As a result, the state of the display device 1 can be easily changed between the first state and the second state. Here, as various electronic devices, for example, there are a digital still camera, a digital video camera, a notebook personal computer, a portable terminal device, a television receiver, and the like. Examples of electronic devices to which such a display device 1 is applied will be shown below.

[Various arrangement examples of the light receiving sensor 3]
FIG. 13 shows an example of the external configuration of a notebook personal computer as an example of an electronic apparatus to which the display device 1 is applied.

  The notebook personal computer 101 is divided into a main body cover 112 and a main body portion 111 with a hinge portion 113 as a boundary, and is configured to be freely foldable via the hinge portion 113. In other words, the main body cover 112 is rotated by the hinge portion 113 and can be opened and closed with respect to the main body portion 111. Normally, the main body cover 112 is opened when in use and closed when not in use.

  In the example of FIG. 13, the EL panel 2 is employed as the display unit of the main body cover 112. Further, the surface of the main body 111 on which the keyboard 121 is disposed is employed as the light receiving surface 71. The light receiving sensor 3 is disposed on the light receiving surface 71 and is embedded in the keyboard 121, for example.

  FIG. 14 is a diagram for explaining the first state among the states that the notebook personal computer 101 of FIG. 13 can take.

  FIG. 14A is a diagram illustrating a state in which the main body cover 112 of the notebook personal computer 101 is closed.

  Note that the user does not normally use the notebook personal computer 101 in the first state.

  14B shows the arrangement relationship between the EL panel 2 and the light receiving surface 71 in the case of the first state shown in FIG.

The light receiving surface 71 including the light receiving sensor 3 is disposed to face the display surface of the EL panel 2. That is, in the example of FIG. 14, as the angle θ between normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2 is 180 degrees, the light receiving surface 71 is arranged.

  Thus, it can be seen that the state shown in FIG. 14A is the first state as the state of the notebook personal computer 101. In such a first state, each of the light receiving sensors 3 can measure the light emission luminance of each pixel 101 in the region in charge on the display surface of the EL panel 2.

  FIG. 15 is a diagram for explaining the second state among the states that the notebook personal computer 101 of FIG. 13 can take.

  FIG. 15A is a diagram showing a state in which the main body cover 112 of the notebook personal computer 101 is opened. Note that the user normally uses the notebook personal computer 101 in the second state.

FIG. 15B shows the arrangement relationship between the EL panel 2 and the light receiving surface 71 in the state of FIG. The light receiving surface 71 including the light receiving sensor 3 is disposed to face the display surface of the EL panel 2. That is, in the example of FIG. 15, the angle θ between normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2 such that 90 °, the light receiving surface 71 is arranged.

  Thus, it can be seen that the state shown in FIG. 15A is the second state as the state of the notebook personal computer 101. In such a second state, the light receiving surface 71 does not impede the light emission of each pixel 101 during normal light emission. In other words, it is possible to produce an effect that the use of the notebook personal computer 101 by the user is not hindered.

  FIG. 16 shows an example of the external configuration of a mobile terminal device as an example of an electronic apparatus to which the display device 1 is applied.

  The mobile terminal device 131 is divided into an upper housing 141 and a lower housing 142 with a hinge 143 as a boundary, and is configured to be freely foldable via the hinge 143. In other words, the upper housing 141 is rotated by the hinge portion 143 and can be opened and closed with respect to the lower housing 142. Normally, the upper housing 141 is opened when in use and closed when not in use.

  In the example of FIG. 16, the EL panel 2 is employed as the display unit of the upper casing 141. Further, the surface on which the input button 151 of the lower casing 142 is disposed is employed as the light receiving surface 71. The light receiving sensor 3 is disposed on the light receiving surface 71 and is embedded in, for example, the input button 151.

Although not shown, the portable terminal device 131 may be in a state where the upper casing 141 is closed with respect to the lower casing 142. In this case, the angle θ between normal vector V ₂ of the normal vector V ₇₁ of the light-receiving surface 71 EL panel 2 is 180 degrees. Such a state is a first state in the mobile terminal device 131. In such a first state, each of the light receiving sensors 3 can measure the light emission luminance of each pixel 101 in the region in charge on the display surface of the EL panel 2.

  On the other hand, the state shown in FIG. 16, that is, the state where the upper casing 141 is opened with respect to the lower casing 142 is the second state. In such a second state, the light receiving surface 71 does not impede the light emission of each pixel 101 during normal light emission. In other words, it is possible to produce an effect that the use of the mobile terminal device 131 by the user is not hindered.

  FIG. 17 shows a configuration example of the appearance of a digital video camera as an example of an electronic apparatus to which the display device 1 is applied.

  The digital video camera 161 is divided into a main body part 171 and a monitor part 172 with a hinge part 173 as a boundary, and is configured to be freely foldable via the hinge part 173. In other words, the monitor unit 172 is rotated by the hinge unit 173 and can be opened and closed with respect to the main body unit 171.

  In the example of FIG. 17, the EL panel 2 is employed as the display unit of the monitor unit 172. In addition, a surface (hereinafter referred to as a monitor storage surface 181) of the main body 171 that faces when the monitor 172 is closed is employed as the light receiving surface 71. The light receiving sensor 3 is disposed on the light receiving surface 71 and is embedded in, for example, the monitor storage surface 181.

Although not shown, when the digital video camera 161 can be in a state where the monitor unit 172 is closed with respect to the main body unit 171, the normal vector V ₇₁ of the light receiving surface 71 and the normal line of the EL panel 2. The angle θ formed with the vector V ₂ is 180 degrees. Such a state is a first state in the digital video camera 161. In such a first state, each of the light receiving sensors 3 can measure the light emission luminance of each pixel 101 in the region in charge on the display surface of the EL panel 2.

  On the other hand, the state shown in FIG. 17, that is, the state where the monitor unit 172 is opened with respect to the main body unit 171 is the second state. In such a second state, the light receiving surface 71 does not impede the light emission of each pixel 101 during normal light emission. In other words, it is possible to achieve an effect that the use of the digital video camera 161 by the user is not hindered.

  In the display device of the present invention, one light receiving sensor 3 can measure the light emission luminance of the plurality of pixels 101. Therefore, in the display device of the present invention, the number of light receiving sensors 3 necessary for executing the burn-in correction control can be reduced, and as a result, the cost required for the burn-in correction control can be reduced.

  Further, in the display device of the present invention, light from the pixel 101 can be received at a short distance with respect to the EL panel 2. As a result, the time required for burn-in correction control can be shortened.

[Application of the present invention]
The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, a pixel 101 dedicated to light emission luminance measurement can be provided on the same surface as the EL panel 2 and outside the display surface of the EL panel 2. Furthermore, the light receiving sensor 3 for measuring the light emission luminance of the pixel 101 dedicated to light emission luminance measurement can be provided on the light receiving surface 71. By using the pixel 101 and the light receiving sensor 3 dedicated to the measurement of light emission luminance, it is possible to easily estimate the degree of deterioration with time of each pixel 101 constituting the EL panel 2.

  In addition, for example, the pattern structure of the pixel 101 described above is employed in other self-luminous panels such as FED (Field Emission Display) in addition to self-luminous panels using organic EL (Electro Luminescent) devices. You can also.

  In addition, as described with reference to FIG. 4, the pixel 101 described above includes two transistors (the sampling transistor 31 and the driving transistor 32) and one capacitor (the storage capacitor 33). Other circuit configurations can also be employed.

  As the circuit configuration of the other pixel 101, for example, the following circuit configuration can be adopted in addition to the configuration of two transistors and one capacitor (hereinafter also referred to as a 2Tr / 1C pixel circuit). That is, a configuration of five transistors and one capacitor (hereinafter also referred to as a 5Tr / 1C pixel circuit) including the first to third transistors can be employed. In the pixel 101 employing the 5Tr / 1C pixel circuit, the signal potential supplied from the horizontal selector 103 to the sampling transistor 31 via the video signal line DTL10 is fixed to Vsig. As a result, the sampling transistor 31 operates only as a function for switching the supply of the signal potential Vsig to the driving transistor 32. Further, the potential supplied to the driving transistor 32 via the power line DSL10 is fixed to the first potential Vcc. Then, the added first transistor switches the supply of the first potential Vcc to the driving transistor 32. The second transistor switches the supply of the second potential Vss to the driving transistor 32. Further, the third transistor switches the supply of the reference potential Vof to the driving transistor 32.

  Further, as the circuit configuration of the other pixels 101, an intermediate circuit configuration between the 2Tr / 1C pixel circuit and the 5Tr / 1C pixel circuit may be employed. That is, a configuration including four transistors and one capacitor (4Tr / 1C pixel circuit), or a configuration including three transistors and one capacitor (3Tr / 1C pixel circuit) can be employed. As the 4Tr / 1C pixel circuit and the 3Tr / 1C pixel circuit, for example, a signal potential supplied from the horizontal selector 103 to the sampling transistor 31 can be pulsed with Vsig and Vofs. That is, one of the third transistors or a configuration in which both the second and third transistors are omitted can be employed.

  Further, in the 2Tr / 1C pixel circuit, the 3Tr / 1C pixel circuit, the 4Tr / 1C pixel circuit, or the 5Tr / 1C pixel circuit, the anode-cathode of the light emitting element 34 is used for the purpose of supplementing the capacitance component of the organic light emitting material portion. An auxiliary capacity may be added between them.

  In this specification, the steps described in the flowcharts include processes that are executed in parallel or individually even if they are not necessarily processed in time series, as well as processes that are executed in time series in the described order. Is also included.

It is a block diagram which shows the structural example of one Embodiment of the display apparatus to which this invention is applied. FIG. 2 is a block diagram illustrating a configuration example of an EL panel of the display device in FIG. 1. It is a figure which shows the arrangement | sequence of the color which the pixel which comprises the EL panel of FIG. 2 light-emits. FIG. 3 is a block diagram illustrating a detailed circuit configuration of a pixel configuring the EL panel of FIG. 2. 3 is a timing chart for explaining an example of an operation of a pixel constituting the EL panel of FIG. 5 is a timing chart for explaining another example of the operation of the pixels constituting the EL panel of FIG. FIG. 2 is a functional configuration example of the display device of FIG. 1, and is a functional block diagram of the display device necessary for executing burn-in correction control. 3 is a flowchart illustrating an example of initial data acquisition processing executed by the display device of FIG. 1. It is a figure explaining the measurement order of the light-emission luminance by the light reception sensor which comprises the display apparatus of FIG. 3 is a flowchart illustrating an example of correction data acquisition processing executed by the display device of FIG. 1. It is a figure explaining arrangement | positioning of the EL panel and light-receiving surface in the display apparatus of FIG. It is a figure explaining the detail of arrangement | positioning of the EL panel and light-receiving surface in the display apparatus of FIG. It is a figure which shows the notebook type personal computer as an example of the electronic device to which the display apparatus of FIG. 1 is applied. It is a figure explaining the 1st state of the notebook type personal computer as an example of the electronic device to which the display apparatus of FIG. 1 is applied. It is a figure explaining the 2nd state of the notebook type personal computer as an example of the electronic device to which the display apparatus of FIG. 1 is applied. It is a figure which shows the portable terminal device as an example of the electronic device to which the display apparatus of FIG. 1 is applied. It is a figure which shows the digital video camera as an example of the electronic device to which the display apparatus of FIG. 1 is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Display apparatus, 2 EL panel, 3 Light receiving sensor, 4 Sensor group, 5 Control part, 11 Hinge part, 31 Sampling transistor, 32 Driving transistor, 33 Storage capacity, 34 Light emitting element, 51 Amplifying part, 52 A / D Conversion unit, 53 signal processing unit, 61 memory, 71 light receiving surface, 101 pixel, 103 horizontal selector (HSEL)

Claims (6)

A panel in which a plurality of pixels that emit light by a self-light-emitting element are disposed;
A light receiving sensor for measuring the light emission luminance of the pixels constituting the panel;
A surface different from the panel, and a light receiving surface on which the light receiving sensor is disposed,
As a state of arrangement of the light receiving surface and the display surface of the panel,
A first state in which the light receiving surface is disposed at a position where the light receiving sensor can measure the light emission luminance of the pixel with respect to the display surface of the panel;
And a second state in which the light receiving surface is disposed at a position where the light receiving sensor cannot measure the light emission luminance of the pixel with respect to the display surface of the panel. Of the angle θ formed by the normal vector of the light receiving surface and the normal vector of the panel, a predetermined angle at which the light receiving sensor can measure the light emission luminance of the pixel is set as a threshold value, and the angle θ is within the threshold value range. The display device according to claim 1, wherein a state in which the angle θ is outside the range of the threshold is employed as the second state. A detachable cover for the panel;
The display device according to claim 1, wherein one surface constituting the cover is adopted as the light receiving surface. Further comprising a hinge part for rotating the light receiving surface so as to be opened and closed with respect to the display surface of the panel,
A state in which the light receiving surface is open with respect to the display surface of the panel is adopted as a first state,
The display device according to claim 1, wherein a state in which the light receiving surface is closed with respect to a display surface of the panel is adopted as a second state. When one of the pixels constituting the panel is a target pixel, the light emission luminance of the target pixel is measured by the light receiving sensor, and an analog light reception signal is output, the light reception signal of the target pixel is set to a predetermined value. An amplification section that amplifies at an amplification factor of
A conversion unit that converts the light reception signal after amplification by the amplification unit into digital data and outputs the digital data;
Based on the digital data output from the conversion unit, correction data for luminance reduction due to deterioration with time is calculated, and based on the correction data, a video signal corresponding to the pixel of interest is corrected, and the corrected video The display device according to claim 1, further comprising: a signal processing unit that supplies a signal to the target pixel. Pixels dedicated to light emission luminance measurement disposed on the same surface as the panel and at a different position from the panel;
The display device according to claim 1, further comprising: a light receiving sensor for measuring light emission luminance of the pixel dedicated to light emission luminance measurement arranged on the light receiving surface.

Images