JP2011128443A - Display device, method of driving the same, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of reducing image persistence with an easy and simple system, to provide a method of driving the same, and electrical equipment. <P>SOLUTION: When a video signal 20A having an aspect ratio equal to that of a display area 10A is input from the external part after the right and left belt-like areas 10A-1 (not shown) of the display area 10A are displayed in black in response to the input of an image signal 20A having an aspect ratio different from that of the display area 10A from the external part, the image signals corresponding to the right and left belt-like areas 10A-1 among the image signals 20A are corrected using a luminance difference between boundary lines L1 and L2 detected by an optical sensor 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device in which a light emitting element is provided on a display panel and a driving method thereof. Moreover, this invention relates to the electronic device provided with the said display apparatus.

  In recent years, in the field of display devices that perform image display, display devices that use current-driven optical elements, such as organic EL (electroluminescence) elements, whose light emission luminance changes according to the value of a flowing current are used as light emitting elements of pixels. Developed and commercialized. Unlike a liquid crystal element or the like, the organic EL element is a self-luminous element. Therefore, a display device (organic EL display device) using an organic EL element does not require a light source (backlight), and thus can be made thinner and brighter than a liquid crystal display device that requires a light source. . In particular, when the active matrix method is used as the driving method, each pixel can be lit in hold, and the power consumption can be reduced. Therefore, organic EL display devices are expected to become the mainstream of next-generation flat panel displays.

  The organic EL element is a current-driven light-emitting element, and is an element capable of adjusting gradation by controlling the amount of current flowing through the organic EL element. However, the organic EL element has a property of deteriorating depending on the light emission amount and the energization time, and the luminance of the organic EL element that has deteriorated is higher than the luminance of the organic EL element that has not progressed so much. Relatively decreases. On the other hand, since the luminance of the display image is not uniform in all pixels, the deterioration of the organic EL element is not uniform in all pixels, and a luminance drop corresponding to the degree of deterioration of the organic EL element occurs in the display region.

  This phenomenon is called “burn-in”, and in order to correct this “burn-in” with high accuracy, it is necessary to correctly detect the actual deterioration state of the organic EL element. As one of the measures, for example, in Patent Document 1, a dummy pixel and a luminance detection sensor are provided in a non-display area, the luminance of the dummy pixel is detected by the luminance detection sensor, and the cumulative deterioration amount difference of the dummy pixel is derived. It is described that the correction amount for the input gradation value of each pixel is derived using this.

JP 2007-206463 A

  However, in the measure of Patent Document 1, it is necessary to derive a cumulative deterioration amount difference and a correction amount for all the pixels, so that there is a problem that the system becomes large.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a display device capable of reducing burn-in with a simple system, a driving method thereof, and an electronic apparatus.

  A display device according to the present invention includes a display unit having a plurality of display pixels arranged two-dimensionally in a display area, a plurality of dummy pixels arranged in a non-display area, and a sensor for detecting the luminance of the plurality of dummy pixels. In addition, a drive unit for driving each display pixel and each dummy pixel is provided. The drive unit includes a display adjustment unit and a signal correction unit. The display adjustment unit displays the aspect ratio of the first video signal by displaying the left and right belt-like areas of the display area in black when a first video signal having an aspect ratio different from the aspect ratio of the display area is input from the outside. The video corresponding to the first video signal can be displayed in the central area which is the area excluding the band-like area in the display area without matching the aspect ratio of the display area. The signal correction unit performs the following four operations when a second video signal for displaying an image in an area including a boundary line between the central area and the left and right belt-like areas is input from the outside. It has become.

(1) One or more of a plurality of dummy pixels may be applied with a second signal voltage that is the same as the first signal voltage applied to one or more display pixels arranged in a region in contact with at least one boundary line in the central region. (2) A fourth signal that is the same as a third signal voltage applied to one or a plurality of display pixels disposed in a region in contact with the boundary line of at least one of the left and right belt-like regions. Applying a voltage to one or more second dummy pixels different from the first dummy pixel among the plurality of dummy pixels (3) of one or more first dummy pixels when the second signal voltage is applied The brightness and the brightness of one or more second dummy pixels when the fourth signal voltage is applied are detected by a sensor. (4) The video signal corresponding to the left and right belt-like regions of the second video signal is detected. Of the sensor It is corrected by using the output signal

  An electronic apparatus according to the present invention includes the display device described above.

  According to another aspect of the present invention, there is provided a display device driving method comprising: the above display unit; and a drive unit that drives each display pixel and each dummy pixel, wherein the drive unit has a function of the display adjustment unit. Among these, when a second video signal for displaying a video in an area including a boundary line between the central area and the left and right belt-like areas is input from the outside, the above four are executed.

  In the display device, the driving method thereof, and the electronic apparatus of the present invention, when a second video signal for displaying an image in an area including a boundary line between the central area and the left and right belt-like areas is input from the outside. The video signal corresponding to the left and right belt-like regions of the second video signal is corrected using the luminance difference at the boundary detected by the sensor. Thereby, the brightness | luminance difference in a boundary line can be made small.

  According to the display device, the driving method thereof, and the electronic apparatus of the present invention, the luminance difference at the boundary line can be reduced. As a result, it is possible to reduce burn-in caused by the display of an image having an aspect ratio different from the aspect ratio of the display area. Thus, in the present invention, image sticking can be reduced with a simple system.

It is the schematic showing an example of the structure of the display apparatus which concerns on one embodiment of this invention. It is the schematic showing an example of a structure of the pixel circuit in a display area. It is the schematic showing an example of a structure of the pixel circuit in a non-display area | region. FIG. 2 is a top view illustrating a configuration of the display panel in FIG. 1. It is a schematic diagram showing a mode that the image | video of the aspect ratio different from the aspect ratio of a display area is displayed. It is a schematic diagram for demonstrating extraction of the video signal corresponding to the display pixel contained in the area | region adjacent to a boundary line. FIG. 10 is a top view illustrating a first modification of the configuration of the display panel in FIG. 1. FIG. 10 is a top view illustrating a second modification example of the configuration of the display panel in FIG. 1. FIG. 10 is a top view illustrating a third modification of the configuration of the display panel in FIG. 1. FIG. 10 is a top view illustrating a fourth modification example of the configuration of the display panel in FIG. 1. It is a perspective view showing the external appearance of the application example 1 of the light-emitting device of the said embodiment. (A) is a perspective view showing the external appearance seen from the front side of the application example 2, (B) is a perspective view showing the external appearance seen from the back side. 12 is a perspective view illustrating an appearance of application example 3. FIG. 14 is a perspective view illustrating an appearance of application example 4. FIG. (A) is a front view of the application example 5 in an open state, (B) is a side view thereof, (C) is a front view in a closed state, (D) is a left side view, and (E) is a right side view, (F) is a top view and (G) is a bottom view.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings. The description will be given in the following order.

1. Embodiment (FIGS. 1 to 6)
2. Modification (FIGS. 7 to 10)
3. Application examples (FIGS. 11 to 15)

<Embodiment>
(Schematic configuration of the display device 1)
FIG. 1 shows a schematic configuration of a display device 1 according to an embodiment of the present invention. The display device 1 includes a display panel 10 (display unit) and a drive circuit 20 (drive unit) that drives the display panel 10.

  The display panel 10 has a display area 10A in which three types of organic EL elements 11R, 11G, and 11B having different emission colors are two-dimensionally arranged. The display area 10A is an area for displaying an image using light emitted from the organic EL elements 11R, 11G, and 11B. The organic EL element 11R is an organic EL element that emits red light, the organic EL element 11G is an organic EL element that emits green light, and the organic EL element 11B is an organic EL element that emits blue light. Hereinafter, the organic EL element 11 is appropriately used as a general term for the organic EL elements 11R, 11G, and 11B.

  The display panel 10 also has a non-display area 10B in which three types of organic EL elements 12R, 12G, and 12B having different emission colors are arranged. The non-display area 10B is an area where light emitted from the organic EL elements 12R, 12G, and 12B is prevented from leaking to the outside. As shown in FIG. 1, one non-display area 10B is provided on each of the left and right sides of the display area 10A. The organic EL element 12R is an organic EL element that emits red light, the organic EL element 12G is an organic EL element that emits green light, and the organic EL element 12B is an organic EL element that emits blue light. Hereinafter, the organic EL element 12 is appropriately used as a general term for the organic EL elements 12R, 12G, and 12B. Thus, the non-display area 10B is provided with the organic EL element 12 that emits the same type of color light as the organic EL element 11 provided in the display area 10A. The organic EL element 12 is preferably composed of the same structure and material as the organic EL element 11.

  A plurality of optical sensors 19 are further arranged in the non-display area 10B. The plurality of photosensors 19 are arranged one by one corresponding to each organic EL element 12, detect light emitted from each organic EL element 12, and output a photodetection signal. .

  The drive circuit 20 includes a timing generation circuit 21, a video signal processing circuit 22, a signal line drive circuit 23, a write line drive circuit 24, and a power supply line drive circuit 25.

(Display pixel 15)
FIG. 2 shows an example of a circuit configuration in the display area 10A. In the display area 10 </ b> A, a plurality of pixel circuits 13 are two-dimensionally arranged in pairs with the individual organic EL elements 11. In the present embodiment, the pair of organic EL elements 11 and the pixel circuit 13 constitute one subpixel 14. More specifically, as shown in FIG. 1, the pair of organic EL elements 11R and the pixel circuit 13 constitute one subpixel 14R, and the pair of organic EL elements 11G and the pixel circuit 13 constitute one subpixel 14G. The pair of organic EL elements 11B and the pixel circuit 13 constitute one subpixel 14B. Furthermore, three subpixels 14R, 14G, and 14B adjacent to each other constitute one pixel (display pixel 15).

Each pixel circuit 13 includes, for example, a drive transistor Tr ₁ , a write transistor Tr _2, and a storage capacitor C _s1 , and has a circuit configuration of 2Tr1C. The drive transistor Tr ₁ and the write transistor Tr ₂ are formed by, for example, n-channel MOS type thin film transistors (TFTs). The drive transistor Tr ₁ or the write transistor Tr ₂ may be, for example, a p-channel MOS type TFT.

In the display area 10A, a plurality of signal lines DTL are arranged in the column direction, and a plurality of scanning lines WSL and power supply lines PSL (members to which power supply voltage is supplied) are arranged in the row direction. One organic EL element 11 is provided near the intersection of each signal line DTL and each scanning line WSL. Each signal line DTL is connected to the output end (not shown) of the signal line drive circuit 23 and one of the drain electrode and the source electrode (not shown) of the write transistor Tr ₂ . Each scanning line WSL is the output end of the write line drive circuit 24 (not shown) is connected to the gate electrode of the writing transistor Tr ₂ (not shown). Each power supply line PSL is connected to the output end (not shown) of the power supply line drive circuit 25 and _one of the drain electrode and the source electrode (not shown) of the drive transistor Tr1. Of the drain electrode and the source electrode of the write transistor Tr ₂ , the one not connected to the signal line DTL (not shown) is connected to the gate electrode (not shown) of the drive transistor Tr ₁ and one end of the storage capacitor C _s1. ing. Of the drain electrode and the source electrode of the drive transistor Tr ₁ , the one not connected to the power supply line PSL (not shown) and the other end of the storage capacitor C _s1 are connected to the anode electrode (not shown) of the organic EL element 11. Has been. A cathode electrode (not shown) of the organic EL element 11 is connected to the ground line GND, for example.

(Dummy pixel 18)
FIG. 3 illustrates an example of a circuit configuration in the non-display area 10B. A plurality of pixel circuits 16 are arranged in pairs with the individual organic EL elements 12 in the non-display area 10B. In the present embodiment, the pair of organic EL elements 12 and the pixel circuit 16 constitute one subpixel 17. More specifically, as shown in FIG. 1, the pair of organic EL elements 12R and the pixel circuit 13 constitute one subpixel 17R, and the pair of organic EL elements 12G and the pixel circuit 13 constitute one subpixel 17G. The pair of organic EL elements 12B and the pixel circuit 13 constitute one subpixel 17B. Furthermore, three subpixels 17R, 17G, and 17B adjacent to each other constitute one pixel (dummy pixel 18).

The pixel circuit 16 has the same configuration as the pixel circuit 13 described above. Specifically, the pixel circuit 16 includes a drive transistor Tr ₃ , a write transistor Tr _4, and a storage capacitor C _s2 , and has a circuit configuration of 2Tr1C. The drive transistor Tr ₃ and the write transistor Tr ₄ are formed by, for example, an n-channel MOS type TFT. The drive transistor Tr ₃ or the write transistor Tr ₄ may be, for example, a p-channel MOS type TFT.

In the non-display area 10B, one signal line DTL is arranged in the column direction, and one scanning line WSL and one power supply line PSL are arranged in the row direction. An organic EL element 12 is provided in the vicinity of the intersection of the signal line DTL and the scanning line WSL. The signal line DTL is connected to the output end (not shown) of the signal line drive circuit 23 and one of the drain electrode and the source electrode (not shown) of the write transistor Tr ₄ . The scanning line WSL is connected to the output end (not shown) of the write line drive circuit 24 and the gate electrode (not shown) of the write transistor Tr ₄ . Each power supply line PSL is connected to the output end (not shown) of the power supply line drive circuit 25 and one of the drain electrode and the source electrode (not shown) of the drive transistor Tr ₃ . Of the drain electrode and the source electrode of the write transistor Tr ₄ , the one not connected to the signal line DTL (not shown) is connected to the gate electrode (not shown) of the drive transistor Tr ₃ and one end of the storage capacitor C _s2. ing. Of the drain electrode and the source electrode of the driving transistor Tr ₃ , the one not connected to the power supply line PSL (not shown) and the other end of the storage capacitor C _s2 are connected to the anode electrode (not shown) of the organic EL element 12. Has been. A cathode electrode (not shown) of the organic EL element 12 is connected to the ground line GND, for example.

(Top panel configuration of display panel 10)
FIG. 4 illustrates an example of a top surface configuration of the display panel 10. The display panel 10 has a structure in which, for example, the drive panel 30 and the sealing panel 40 are bonded together via a sealing layer (not shown).

  The drive panel 30 has a plurality of display pixels 15 two-dimensionally arranged in the display area 10A, and has a plurality of dummy pixels 18 two-dimensionally arranged in the non-display area 10B. That is, the drive panel 30 is configured such that a plurality of display pixels 15 and a plurality of dummy pixels 18 are formed on a common substrate (not shown). If the number of pixels in the vertical direction of the display area 10A is y, the number of pixels in the vertical direction of the non-display area 10B is also y. Further, the number of pixels in the horizontal direction of the left non-display area 10B is n (n is a positive number of 2 or more), and the number of pixels in the horizontal direction of the right non-display area 10B is n. . That is, in both the left non-display area 10B and the right non-display area 10B, a plurality of dummy pixels 18 are arranged in a matrix of y × n, and the number of dummy pixels 18 in the non-display area 10B as a whole is y × 2n. Hereinafter, in order to simplify the description, a case where n is 2 will be described.

  For example, as shown in FIG. 4, a plurality of video signal supply TABs 51 and a plurality of light detection signal output TCPs 54 are attached to one side (long side) of the drive panel 30. For example, a scanning signal supply TAB 52 is attached to the other side (short side) of the drive panel 30. Further, for example, a power supply voltage supply TAB 53 is attached to a short side of the drive panel 30 and a side different from the scanning signal supply TAB 52. The video signal supply TAB 51 is obtained by hollow-wiring an IC in which the signal line driving circuit 23 is integrated into an opening of a film-like wiring board. The scanning signal supply TAB 52 is obtained by hollow wiring an IC in which the writing line driving circuit 24 is integrated in an opening of a film-like wiring board. The power supply voltage supply TAB 53 is an IC in which the power supply line driving circuit 25 is integrated and is hollowly wired in the opening of a film-like wiring board. The power supply voltage supply TAB 53 is connected to the output terminal of a power supply circuit (not shown). The photodetection signal output TCP 54 is connected to the input end (not shown) of the video signal processing circuit 22. Note that the signal line drive circuit 23, the write line drive circuit 24, and the power supply line drive circuit 25 do not have to be formed in the TAB, and may be formed in the drive panel 30, for example.

  The sealing panel 40 includes, for example, a sealing substrate (not shown) that seals the organic EL elements 11 and 12 and a color filter (not shown). For example, the color filter is provided in a region of the surface of the sealing substrate through which light from the organic EL element 11 passes. The color filter has, for example, a red filter, a green filter, and a blue filter (not shown) corresponding to each of the organic EL elements 11R, 11G, and 11B.

(Drive circuit 20)
Next, each circuit in the drive circuit 20 will be described with reference to FIG. The timing generation circuit 21 controls the video signal processing circuit 22, the signal line drive circuit 23, the write line drive circuit 24, and the power supply line drive circuit 25 to operate in conjunction with each other.

  The timing generation circuit 21 outputs a control signal 21A to each circuit described above, for example, in response to (in synchronization with) the synchronization signal 20B input from the outside. The timing generation circuit 21 is formed on a control circuit board (not shown) separate from the display panel 10 together with the video signal processing circuit 22 and the like, for example.

  For example, the video signal processing circuit 22 corrects the video signal 20A input from the outside according to (synchronizes with) the synchronization signal 20B input from the outside, and the corrected video signal as the video signal 22A. The signal is output to the signal line driving circuit 23. For example, as shown in FIG. 1, the video signal processing circuit 22 includes a display adjustment unit 26 and a signal correction unit 27.

  The display adjustment unit 26 can perform the following signal processing when a video signal 20A (first video signal) having an aspect ratio different from the aspect ratio of the display area 10A is input from the outside. For example, it is assumed that a video signal 20A having an aspect ratio of 4: 3 is input from the outside when the aspect ratio of the display area 10A is 16: 9. At this time, for example, as shown in FIG. 5, the display adjustment unit 26 displays the left and right belt-like areas 10A-1 in the display area 10A in black, thereby changing the aspect ratio of the video signal 20A to the aspect ratio of the display area 10A. The video corresponding to the video signal 20A can be displayed in the central area 10A-2, which is an area excluding the belt-like area 10A-1 in the display area 10A without matching the ratio. Here, for example, the display adjustment unit 26 generates a video signal corresponding to the black gradation in order to display the left and right belt-like regions 10A-1 in black, and the video signal and the video signal 20A input from the outside. And a new video signal 26A is generated and output to the signal correction unit 27. On the other hand, for example, when the video signal 20A having the same aspect ratio as the aspect ratio of the display area 10A is input from the outside, the display adjustment unit 26 does not perform the above-described signal processing and performs the video signal 20A input from the outside. Is output to the signal correction unit 27 as it is.

  When the video signal 26A is input from the display adjustment unit 26, the signal correction unit 27 performs normal correction (for example, gamma correction) on the video signal 26A, and then outputs the corrected video signal. The video signal 22A is output to the signal line drive circuit 23. On the other hand, the signal correction unit 27 displays a video signal (second video signal) in the display area 10A in an area including boundary lines L1 and L2 between the center area 10A-2 and the left and right belt-like areas 10A-1. For example, when the video signal 20A is input from the display adjustment unit 26, the following signal processing is performed. That is, the signal correction unit 27 performs normal correction (for example, gamma correction) on the second video signal, and then performs, for example, the following “burn-in correction” on the corrected video signal. The video signal 27 (for example, video signals 27A, 27B, 27C, and 27D described later) after the burn-in correction processing is output to the signal line drive circuit 23 as the video signal 22A.

  Note that the signal correction unit 27 may first perform “burn-in correction processing” on the second video signal. That is, the signal correction unit 27 performs a burn-in correction process on the second video signal, and then performs a normal correction (for example, gamma correction) on the video signal after the burn-in correction process. The video signal may be output to the signal line drive circuit 23 as the video signal 22A.

(Burn-in correction process)
Hereinafter, the burn-in correction process will be described. The burn-in correction process refers to a series of signal processes for reducing burn-in caused by displaying an image having an aspect ratio different from the aspect ratio of the display area 10A.

  First, the signal correction unit 27 outputs video signals (video signals 27A) corresponding to y display pixels 15 arranged in a strip-shaped area α1 (see FIG. 6) in contact with the left boundary line L1 in the central area 10A-2. ) Is extracted from the second video signal. In addition, the signal correction unit 27 includes video signals (video signals 27B) corresponding to the y display pixels 15 arranged in the band-shaped region α2 (see FIG. 6) in contact with the right boundary line L2 in the central region 10A-2. ) Is extracted from the second video signal. Further, the signal correction unit 27 outputs video signals (video signals 27C) corresponding to y display pixels 15 arranged in the belt-like region α3 (see FIG. 6) in contact with the boundary line L1 in the left belt-like region 10A-1. ) Is extracted from the second video signal. Further, the signal correction unit 27 outputs a video signal (video signal 27D) corresponding to y display pixels 15 arranged in a belt-like region α4 (see FIG. 6) in contact with the boundary line L2 in the right belt-like region 10A-1. ) Is extracted from the second video signal. That is, the signal correction unit 27 outputs the video signals 27A, 27B, 27C, and 27D corresponding to the four columns of pixel arrays adjacent to the boundary lines L1 and L2 among the plurality of display pixels 15 that are two-dimensionally arranged as the second video. Extract from signal.

  Next, the signal correction unit 27 assigns the video signals 27A, 27B, 27C, and 27D as the video signals for the plurality of dummy pixels 18, and then uses the video signals 27A, 27B, 27C, and 27D as the video signal 22A. To 23. Specifically, the signal correction unit 27 assigns the video signal 27A to the pixel array of one column included in the left non-display area 10B among the plurality of dummy pixels 18, and as the video signal for the pixel array. The video signal 27A is output to the signal line drive circuit 23. In addition, the signal correction unit 27 assigns the video signal 27B to another one column of the pixel array included in the left non-display area 10B among the plurality of dummy pixels 18, and the video as the video signal for the pixel array. The signal 27B is output to the signal line driving circuit 23. In addition, the signal correction unit 27 assigns the video signal 27C to the pixel array of one column included in the right non-display area 10B among the plurality of dummy pixels 18, and the video signal 27C as the video signal for the pixel array. Is output to the signal line drive circuit 23. In addition, the signal correction unit 27 assigns the video signal 27D to another one column of pixel arrays included in the right non-display area 10B among the plurality of dummy pixels 18, and the video as the video signal for the pixel array. The signal 27D is output to the signal line driving circuit 23. That is, the signal correction unit 27 displays the same image as the image displayed by the four columns of pixel arrays adjacent to the boundary lines L1 and L2 among the plurality of display pixels 15 arranged two-dimensionally. To be displayed.

  Thereafter, the signal correction unit 27 acquires a light detection signal corresponding to the light emission luminance of each dummy pixel 18 from each light sensor 19, and uses the light detection signal, the left and right belt-like regions 10 </ b> A− of the second video signal. The video signal corresponding to 1 is corrected. Specifically, the signal correction unit 27 first corresponds to the light emission luminance of the pixel array in one column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27C is applied among the plurality of dummy pixels 18. The difference between the light detection signal V1 and the light detection signal V2 corresponding to the light emission luminance of the pixel array of one column to which the signal voltage (second signal voltage) corresponding to the video signal 27A is applied among the plurality of dummy pixels 18. ΔV1 (= V1−V2) is derived. The difference ΔV1 is a value corresponding to the luminance difference on the left boundary line L1. Next, the signal correction unit 27 corrects the video signal corresponding to the left band-like region 10A-1 in the second video signal using the difference ΔV1. For example, the signal correction unit 27 reduces the number of gradations corresponding to ΔV1 from the video signal corresponding to the left band region 10A-1 in the second video signal.

  Similarly, the signal correction unit 27 derives a value corresponding to the luminance difference on the left boundary line L1. Specifically, the signal correction unit 27 first corresponds to the light emission luminance of the pixel array in one column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27D is applied among the plurality of dummy pixels 18. Difference between the light detection signal V3 and the light detection signal V4 corresponding to the light emission luminance of the pixel array of one column to which the signal voltage (second signal voltage) corresponding to the video signal 27B is applied among the plurality of dummy pixels 18. ΔV2 (= V3−V4) is derived. This difference ΔV2 is a value corresponding to the luminance difference on the right boundary line L2. Next, the signal correction unit 27 uses the difference ΔV2 to correct the video signal corresponding to the right band region 10A-1 in the second video signal. For example, the signal correction unit 27 reduces the number of gradations corresponding to ΔV2 from the video signal corresponding to the right band region 10A-1 of the second video signal.

  The signal line drive circuit 23 outputs the video signal 22A input from the video signal processing circuit 22 to each signal line DTL in response to (synchronously with) the input of the control signal 21A. Each dummy pixel 18 is driven. The signal line drive circuit 23 outputs a signal voltage corresponding to the display pixel 15 for one line selected by the write line drive circuit 24 to the signal line DTL corresponding to the display pixel 15. Yes. For the signal line DTL corresponding to the dummy pixel 18, the signal line driving circuit 23 forms the band-shaped regions α1 to α4 (see FIG. 6) among the display pixels 15 for one line selected by the writing line driving circuit 24. The same signal voltage as the signal voltage corresponding to the four display pixels 15 arranged in the reference) is output.

  Specifically, the signal line drive circuit 23 applies a signal to one display pixel 15 arranged in the band-shaped region α1 among the display pixels 15 for one line selected by the write line drive circuit 24. One dummy pixel selected by the write line drive circuit 24 in the pixel array of one column in the left non-display area 10B with the same signal voltage (second signal voltage) as the voltage (first signal voltage) 18 is output. Further, the signal line driving circuit 23 applies a signal voltage (first voltage) applied to one display pixel 15 arranged in the band-like region α2 among the display pixels 15 for one line selected by the writing line driving circuit 24. The same signal voltage (second signal voltage) as one signal voltage) is output to one dummy pixel 18 selected by the write line driving circuit 24 in the pixel array of one column in the right non-display area 10B. It is supposed to be. Further, the signal line driving circuit 23 applies a signal voltage (first voltage) applied to one display pixel 15 arranged in the band-shaped region α3 among the display pixels 15 for one line selected by the writing line driving circuit 24. One dummy pixel 18 selected by the write line driving circuit 24 from another one column of the pixel array in the left non-display area 10B. To output. Further, the signal line driving circuit 23 applies a signal voltage (first voltage) applied to one display pixel 15 arranged in the band-shaped region α4 among the display pixels 15 for one line selected by the writing line driving circuit 24. One dummy pixel 18 selected by the write line driving circuit 24 in the pixel array of another column in the non-display area 10B on the right side. To output.

  The write line driving circuit 24 sequentially selects one scanning line WSL from among the plurality of scanning lines WSL in response to (in synchronization with) the input of the control signal 21A. The write line driving circuit 24 is provided in a scanning signal supply TAB 52 attached to the other side (short side) of the driving panel 30 as shown in FIG.

  The power supply line drive circuit 25 sequentially applies a power supply voltage supplied from a power supply circuit (not shown) to the plurality of power supply lines PSL in response to (in synchronization with) the input of the control signal 21A. Is used to control the light emission and quenching.

(Operation of display device 1)
Next, an example of operation | movement of the display apparatus 1 of this Embodiment is demonstrated. First, the video signal 20 </ b> A and the synchronization signal 20 </ b> B are input to the display device 1 from the outside. Then, the control signal 21A is output from the timing generation circuit 21 to each circuit in the drive circuit 20, and each circuit in the drive circuit 20 operates according to the instruction of the control signal 21A. Specifically, a video signal 22A is generated in the video signal processing circuit 22, and the generated video signal 22A is output to each signal line DTL by the signal line driving circuit 23, and at the same time, a plurality of signals are written by the writing line driving circuit 24. One scanning line WSL is sequentially selected from the scanning lines WSL. Further, when the video signal processing circuit 22 generates a video signal for the dummy pixel 18, and the generated video signal for the dummy pixel 18 is output to each signal line DTL for the dummy pixel 18 by the signal line driving circuit 23. At the same time, one scanning line WSL is sequentially selected from the plurality of scanning lines WSL for the dummy pixels 18 by the write line driving circuit 24. A desired power supply voltage is sequentially applied to the plurality of power supply lines PSL by the power supply line driving circuit 25. Thereby, each display pixel 15 and each dummy pixel 18 are driven, and an image is displayed on the display area 10A.

(Effect of display device 1)
Next, effects of the display device 1 according to the present embodiment will be described. In the present embodiment, the video signal 20A having an aspect ratio different from the aspect ratio of the display area 10A is input from the outside, and the left and right belt-like areas 10A-1 of the display area 10A are displayed in black, and then the display area 10A When a second video signal (typically a video signal 20A having an aspect ratio equal to the aspect ratio of the display area 10A) for displaying an image in an area including the boundary lines L1 and L2 is input from the outside, Among the signals, the video signal corresponding to the left and right belt-like regions 10 </ b> A- 1 is corrected using the luminance difference between the boundary lines L <b> 1 and L <b> 2 detected by the optical sensor 19. Thereby, since the luminance difference between the boundary lines L1 and L2 can be reduced, it is possible to reduce burn-in caused by the display of an image having an aspect ratio different from the aspect ratio of the display area 10A. As described above, in the display device 1 according to the present embodiment, the burn-in can be reduced with a simple system.

<Modification>
(First modification)
In the above-described embodiment, the case where the same number of dummy pixels 18 is provided in both non-display areas 10B provided on both the left and right sides of the display area 10A is illustrated, but a different number of dummy pixels is provided. 18 may be provided. In the above-described embodiment, the case where the number of columns of the dummy pixels 18 is equal in both the non-display areas 10B provided on the left and right sides of the display area 10A is illustrated, but may be different from each other.

(Second modification)
In the above embodiment, the non-display area 10B is provided on both the left and right sides of the display area 10A. However, for example, it may be provided only on the right side of the display area 10A as shown in FIG. As shown in FIG. 8, it may be provided only on the left side of the display area 10A. However, in those cases, it is preferable that the plurality of dummy pixels 18 be arranged in a y × 2n matrix in the left display area 10A or the right display area 10A, but arranged in a y × n matrix. May be.

  When a plurality of dummy pixels 18 are arranged in a matrix of y × (e + f) (e and f are both positive numbers) in the left display area 10A or the right display area 10A, each dummy pixel 18 has For example, a signal voltage is applied as follows. Further, the correction of the video signal corresponding to the left and right belt-like regions 10A-1 in the second video signal is performed as follows, for example.

  The signal line driving circuit 23 includes a signal voltage (first signal voltage) to be applied to an e-column pixel array (e × y display pixels 15) arranged in the region α1 or the region α2 in the central region 10A-2. The same signal voltage (second signal voltage) is applied to the e-column pixel array (e × y dummy pixels 18) in the non-display area 10B. In addition, the signal line driving circuit 23 includes f columns arranged in a region α3 in contact with the boundary line L1 in the left belt-like region 10A-1 or a region α4 in contact with the boundary line L2 in the right belt-like region 10A-1. The same signal voltage (fourth signal voltage) as the signal voltage (third signal voltage) applied to the pixel array (f × y display pixels 15) is applied to the pixel array of another f column (non-display area 10B). Applied to f × y dummy pixels 18).

  First, the signal correction unit 27 includes an e-column pixel array (e × y display) to which a signal voltage (fourth signal voltage) corresponding to the video signal 27C or the video signal 27D is applied among the plurality of dummy pixels 18. The pixel array of the f column to which the light detection signal V5 corresponding to the light emission luminance of the pixel 15) and the signal voltage (second signal voltage) corresponding to the video signal 27A or the video signal 27B among the plurality of dummy pixels 18 are applied. Using the light detection signal V6 corresponding to the light emission luminance of (f × y display pixels 15), the video signal corresponding to the belt-like regions 10A-1 on both the left and right sides of the second video signal is corrected.

(Third Modification)
Further, in the above embodiment, the plurality of dummy pixels 18 are provided in the vertical direction, but the number of dummy pixels 18 included in one column is the same as that of the display pixels 15 included in one column in the display region 10A. It may not be the same as the number (y), for example, as shown in FIG.

(Fourth modification)
In the above-described embodiment, when the plurality of dummy pixels 18 are arranged in a y × 2 matrix in both the left non-display area 10B and the right non-display area 10B, that is, n is 2. Although the case has been described, n is not limited to 2, and may be an even number of 4 or more. In this case, however, a signal voltage is applied to each dummy pixel 18 as follows, for example. Further, the correction of the video signal corresponding to the left and right belt-like regions 10A-1 in the second video signal is performed as follows, for example.

  The signal line driving circuit 23 applies a signal voltage (first signal voltage) applied to (n / 2) × y display pixels 15 arranged in the region α1 in contact with the left boundary line L1 in the central region 10A-2. The same signal voltage (second signal voltage) is applied to (n / 2) × y dummy pixels 18 in the left non-display area 10B. Further, the signal line driving circuit 23 applies a signal voltage (first signal) applied to (n / 2) × y display pixels 15 arranged in the region α2 in contact with the right boundary line L2 in the central region 10A-2. The same signal voltage (second signal voltage) as (voltage) is applied to (n / 2) × y dummy pixels 18 in the right non-display area 10B. Further, the signal line driving circuit 23 applies a signal voltage (the first voltage) applied to the (n / 2) × y display pixels 15 arranged in the region α3 in contact with the left boundary line L1 in the left strip region 10A-1. The same signal voltage (fourth signal voltage) as (three signal voltages) is applied to another (n / 2) × y dummy pixels 18 in the left non-display area 10B. The signal line driving circuit 23 applies a signal voltage (third) to the (n / 2) × y display pixels 15 arranged in the region α4 in contact with the right boundary line L2 in the right band region 10A-1. The same signal voltage (fourth signal voltage) as the signal voltage is applied to another (n / 2) × y dummy pixels 18 in the right non-display area 10B.

  First, the signal correction unit 27 outputs light corresponding to the light emission luminance of the pixel array in the (n / 2) column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27C is applied among the plurality of dummy pixels 18. The detection signal V1 and the light detection signal V2 corresponding to the light emission luminance of the pixel array in the (n / 2) column to which the signal voltage (second signal voltage) corresponding to the video signal 27A is applied among the plurality of dummy pixels 18. Are used to correct the video signal corresponding to the left band 10A-1 in the second video signal. Similarly, the signal correction unit 27 first emits the luminance of the pixel array in the (n / 2) column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27D is applied among the plurality of dummy pixels 18. Corresponds to the light emission luminance of the pixel array in the (n / 2) column to which the signal voltage (second signal voltage) corresponding to the video signal 27B among the plurality of dummy pixels 18 is applied. Using the light detection signal V4, the video signal corresponding to the right band-like region 10A-1 in the second video signal is corrected.

(5th modification)
In the above-described embodiment, when the plurality of dummy pixels 18 are arranged in a y × 2 matrix in both the left non-display area 10B and the right non-display area 10B, that is, n is 2. Although the case has been described, n is not limited to 2, and may be a positive number of 3 or more. For example, the number of dummy pixels 18 in the left non-display area 10B is y × k (k = a + c), and the number of dummy pixels 18 in the right non-display area 10B is y × m (m = b + d). In this case, a signal voltage is applied to each dummy pixel 18 as follows, for example. At this time, the correction of the video signal corresponding to the left and right belt-like regions 10A-1 in the second video signal is performed as follows, for example. Note that a, b, c, d, k, and m are all positive numbers.

  The signal line driving circuit 23 has the same signal voltage (first signal voltage) as that applied to the a × y display pixels 15 arranged in the region α1 in contact with the left boundary line L1 in the central region 10A-2. A voltage (second signal voltage) is applied to the a × y dummy pixels 18 in the left non-display area 10B. The signal line drive circuit 23 is the same as the signal voltage (first signal voltage) applied to the b × y display pixels 15 arranged in the region α2 in contact with the right boundary line L2 in the central region 10A-2. Is applied to the b × y dummy pixels 18 in the non-display area 10B on the right side. Further, the signal line driving circuit 23 is the same as the signal voltage (third signal voltage) applied to the c × y display pixels 15 arranged in the region α3 in contact with the boundary line L1 in the left belt-like region 10A-1. Is applied to another c × y dummy pixels 18 in the left non-display area 10B. Further, the signal line driving circuit 23 is the same as the signal voltage (third signal voltage) applied to the d × y display pixels 15 arranged in the region α4 in contact with the boundary line L2 in the right band region 10A-1. The signal voltage (fourth signal voltage) is applied to another d × y dummy pixels 18 in the right non-display area 10B.

  First, the signal correction unit 27 includes a light detection signal V1 corresponding to the light emission luminance of the pixel array in the c column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27C is applied among the plurality of dummy pixels 18. Among the plurality of dummy pixels 18, the second video is used by using the light detection signal V2 corresponding to the light emission luminance of the pixel array in the column a to which the signal voltage (second signal voltage) corresponding to the video signal 27A is applied. Among the signals, the video signal corresponding to the left belt-like region 10A-1 is corrected. Similarly, the signal correction unit 27 first outputs light corresponding to the light emission luminance of the pixel array of the d column to which the signal voltage (fourth signal voltage) corresponding to the video signal 27D is applied among the plurality of dummy pixels 18. Using the detection signal V3 and the light detection signal V4 corresponding to the light emission luminance of the pixel array in the b column to which the signal voltage (second signal voltage) corresponding to the video signal 27B is applied among the plurality of dummy pixels 18. The video signal corresponding to the right band 10A-1 in the second video signal is corrected.

(Sixth Modification)
In the above-described embodiment, the drive panel 30 has a plurality of display pixels 15 and a plurality of dummy pixels 18 formed on a common substrate (not shown). It may be formed on (not shown). For example, as shown in FIG. 10, a plurality of display pixels 15 are formed on a panel 10-1, and a plurality of dummy pixels 18 are formed on a panel 10-2 separate from the panel 10-1. Also good.

<Application example>
Hereinafter, application examples of the display device 1 described in the above embodiment and the modifications thereof will be described. The display device 1 according to the above-described embodiment or the like receives a video signal input from the outside or a video signal generated inside, such as a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera. The present invention can be applied to display devices of electronic devices in various fields that display as images or videos.

(Application example 1)
FIG. 11 illustrates an appearance of a television device to which the display device 1 according to the above-described embodiment or the like is applied. This television apparatus has, for example, a video display screen unit 300 including a front panel 310 and a filter glass 320, and the video display screen unit 300 is configured by the display device 1 according to the above-described embodiment or the like. .

(Application example 2)
FIG. 12 illustrates an appearance of a digital camera to which the display device 1 according to the above-described embodiment and the like is applied. The digital camera includes, for example, a flash light emitting unit 410, a display unit 420, a menu switch 430, and a shutter button 440. The display unit 420 is configured by the display device 1 according to the above-described embodiment or the like. Yes.

(Application example 3)
FIG. 13 illustrates an appearance of a notebook personal computer to which the display device 1 according to the above-described embodiment or the like is applied. The notebook personal computer includes, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying an image. The display unit 530 is a display device such as the above-described embodiment. 1.

(Application example 4)
FIG. 14 shows an appearance of a video camera to which the display device 1 according to the above-described embodiment or the like is applied. The video camera has, for example, a main body 610, a subject shooting lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of shooting, and a display 640. Reference numeral 640 denotes the display device 1 according to the above-described embodiment or the like.

(Application example 5)
FIG. 15 illustrates an appearance of a mobile phone to which the display device 1 according to the above-described embodiment and the like is applied. For example, the mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. Yes. The display 740 or the sub-display 750 is configured by the display device 1 according to the above-described embodiment or the like.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... Display panel, 10-1, 10-2 ... Panel, 10A ... Display area, 10A-1 ... Strip | belt-shaped area, 10A-2 ... Central area, 10B ... Non-display area, 11, 11R, 11G , 11B, 12, 12R, 12G, 12B ... Organic EL element, 13, 16 ... Pixel circuit, 14, 14R, 14G, 14B, 17, 17R, 17G, 17B ... Subpixel, 15 ... Display pixel, 18 ... Dummy pixel , 19 ... optical sensor, 20 ... drive circuit, 20A, 22A, 27A, 27B, 27C, 27D ... video signal, 20B ... synchronization signal, 21 ... timing generation circuit, 21A ... control signal, 22 ... video signal processing circuit, 23 ... Signal line drive circuit, 24 ... write line drive circuit, 25 ... power supply line drive circuit, 26 ... display adjustment unit, 27 ... signal correction unit, 30 ... drive panel, 40 ... sealing panel, 51 ... Image signal supply TAB, 52 ... scanning signal supply TAB, 53 ... power supply voltage supply TAB, 54 ... light detection signal output TCP, C _s1, C _s2 ... storage capacitor, DTL ... signal line, GND ... ground line, L1, L2 ... Boundary line, PSL: power supply line, Tr ₁ , Tr ₃ ... drive transistor, Tr ₂ , Tr ₄ ... write transistor, V1, V2, V3, V4, V5, V6 ... photodetection signal, V _el ... voltage, WSL ... write Margin, α1, α2, α3, α4... Region.

Claims (6)

A display unit having a plurality of display pixels two-dimensionally arranged in the display region, a plurality of dummy pixels arranged in the non-display region, and a sensor for detecting the luminance of the plurality of dummy pixels;
A drive unit for driving each display pixel and each dummy pixel,
The drive unit is
When the first video signal having an aspect ratio different from the aspect ratio of the display area is input from the outside, the left and right belt-like areas of the display area are displayed in black so that the aspect ratio of the first video signal is not changed. And a display adjustment unit that can display a video corresponding to the first video signal in a central area that is an area excluding the band-shaped area in the display area;
Among the display areas, when a second video signal for displaying an image in an area including a boundary line between the central area and the left and right belt-like areas is input from the outside, at least one boundary line in the central area A second signal voltage that is the same as a first signal voltage applied to one or a plurality of display pixels disposed in a region in contact with the first pixel is applied to one or a plurality of first dummy pixels of the plurality of dummy pixels, and the left and right A fourth signal voltage that is the same as a third signal voltage applied to one or a plurality of display pixels disposed in a region in contact with the boundary line in at least one of the strip-shaped regions of the plurality of dummy pixels. Applying to one or a plurality of second dummy pixels different from one dummy pixel, and further, the luminance of one or a plurality of first dummy pixels when the second signal voltage is applied, and the fourth signal power Is detected by the sensor, and the video signal corresponding to the left and right belt-like regions of the second video signal is detected as the detection signal of the sensor. And a signal correction unit that corrects the display using the display device. The display unit includes dummy pixels whose number of pixels is (k + m) times (k = a + c, m = b + d) times the number of pixels y in the vertical direction of the display area,
When the second video signal is input from the outside, the signal correction unit includes a × y display pixels arranged in a region in contact with a left boundary line in the central region, A second signal voltage that is the same as the first signal voltage applied to b × y display pixels arranged in a region in contact with the right boundary line is set to (a + b) × y first of the plurality of dummy pixels. Applied to the dummy pixel, c × y display pixels arranged in a region in contact with the boundary line in the left band-like region, and arranged in a region in contact with the boundary line in the right band-like region The fourth signal voltage that is the same as the third signal voltage applied to the d × y display pixels is applied to (c + d) × y second dummy pixels different from the first dummy pixel among the plurality of dummy pixels. And the second signal voltage is applied. Detecting the brightness of (a + b) × y first dummy pixels and the brightness of (c + d) × y second dummy pixels when the fourth signal voltage is applied, The display device according to claim 1, wherein a video signal corresponding to the left and right belt-like regions of the second video signal is corrected using a detection signal of the sensor. The display unit includes at least dummy pixels having a number of pixels (e + f) times the number of pixels y in the vertical direction of the display area,
When the second video signal is input from the outside, the signal correction unit applies first to e × y display pixels arranged in a region in contact with one of the boundary lines in the central region. The second signal voltage that is the same as the signal voltage is applied to e × y first dummy pixels among the plurality of dummy pixels, and the region that is in contact with the boundary line in any one of the left and right belt-like regions F × y second dummy pixels different from the first dummy pixel among the plurality of dummy pixels, the fourth signal voltage being the same as the third signal voltage applied to the f × y display pixels arranged in And the luminance of the e × y first dummy pixels when the second signal voltage is applied, and the f × y second when the fourth signal voltage is applied. The brightness of a dummy pixel is detected by the sensor, and the second video signal The out video signal corresponding to the right and left band-like region, the display device according to claim 1 for correcting by using a detection signal of the sensor. The display device according to any one of claims 1 to 3, wherein the display unit includes a display panel in which the plurality of display pixels and the plurality of dummy pixels are formed on a common substrate. A display unit having a plurality of display pixels two-dimensionally arranged in the display region, a plurality of dummy pixels arranged in the non-display region, and a sensor for detecting the luminance of the plurality of dummy pixels;
A drive unit for driving each display pixel and each dummy pixel,
When the driving unit receives a first video signal having an aspect ratio different from the aspect ratio of the display area from the outside, the driving unit displays the left and right belt-shaped areas of the display area in black, thereby displaying the first video signal. In the display device capable of displaying an image corresponding to the first video signal in a central area that is an area excluding the strip-shaped area in the display area without changing an aspect ratio, in the display area, the center When a second video signal for displaying an image in an area including a boundary line between the area and the left and right belt-like areas is input from the outside, 1 is disposed in an area in contact with at least one of the central areas. Alternatively, the second signal voltage that is the same as the first signal voltage applied to the plurality of display pixels is applied to one or the plurality of first dummy pixels among the plurality of dummy pixels, and at least the left and right belt-shaped regions are Among the plurality of dummy pixels, the first dummy pixel is a fourth signal voltage that is the same as a third signal voltage applied to one or a plurality of display pixels arranged in a region in contact with the boundary line in one region. When applied to one or more different second dummy pixels, and further when the fourth signal voltage is applied and the luminance of the one or more first dummy pixels when the second signal voltage is applied The luminance of one or a plurality of second dummy pixels is detected by the sensor, and the video signal corresponding to the left and right belt-like regions in the second video signal is corrected using the detection signal of the sensor. Driving method. A display device,
The display device
A display unit having a plurality of display pixels two-dimensionally arranged in the display region, a plurality of dummy pixels arranged in the non-display region, and a sensor for detecting the luminance of the plurality of dummy pixels;
A drive unit for driving each display pixel and each dummy pixel,
The drive unit is
When the first video signal having an aspect ratio different from the aspect ratio of the display area is input from the outside, the left and right belt-like areas of the display area are displayed in black so that the aspect ratio of the first video signal is not changed. And a display adjustment unit that can display a video corresponding to the first video signal in a central area that is an area excluding the band-shaped area in the display area;
Among the display areas, when a second video signal for displaying an image in an area including a boundary line between the central area and the left and right belt-like areas is input from the outside, at least one boundary line in the central area A second signal voltage that is the same as a first signal voltage applied to one or a plurality of display pixels disposed in a region in contact with the first pixel is applied to one or a plurality of first dummy pixels of the plurality of dummy pixels, and the left and right A fourth signal voltage that is the same as a third signal voltage applied to one or a plurality of display pixels disposed in a region in contact with the boundary line in at least one of the strip-shaped regions of the plurality of dummy pixels. Applying to one or a plurality of second dummy pixels different from one dummy pixel, and further, the luminance of one or a plurality of first dummy pixels when the second signal voltage is applied, and the fourth signal power Is detected by the sensor, and the video signal corresponding to the left and right belt-like regions of the second video signal is detected as the detection signal of the sensor. And an electronic device including a signal correction unit to be corrected.

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