JP2011082213A - Display panel, module, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display panel, a module and an electronic apparatus, capable of reducing deterioration in image quality due to deterioration in light emission characteristics while suppressing an increase in an area around an effective display region. <P>SOLUTION: A display panel 10 includes a folded part R1 in the peripheral region SB of an effective display region SA in a display screen S, wherein the folded part is provided by folding a part of a panel substrate 10a toward the rear face side. A plurality of display pixels Pr, each of which comprising a light-emitting element, are provided in the effective display region SA, and a plurality of dummy pixels Pd for detecting deterioration in light emission characteristics of the display pixels Pr are provided in the folded part R1. Thus, the necessity of securing a mounting space for each dummy pixel Pd around the effective display region SA on the display side of the panel can be eliminated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention particularly relates to a display panel and module using an organic EL (Electro Luminescence) element, and an electronic apparatus.

  2. Description of the Related Art In recent years, in the field of display devices that perform image display, display devices (organic EL display devices) that use current-driven optical elements, such as organic EL elements, whose light emission luminance varies according to the value of a flowing current as light emitting elements. Developed and commercialized.

  Unlike a liquid crystal element or the like, the organic EL element is a self-luminous element. Therefore, since the organic EL display device does not require a light source (backlight), the image visibility is high, the power consumption is low, and the response speed of the element is fast compared with a liquid crystal display device that requires a light source.

  In such an organic EL display device, it is known that the current-voltage (IV) characteristics of the organic EL element deteriorate (deteriorate with time) as time passes. Due to such characteristic deterioration, in the pixel circuit that current-drives the organic EL element, the light emission luminance also changes accordingly. In view of this, a method has been proposed in which the amount of deterioration of the organic EL element is detected, the amount of deterioration is fed back, the gradation value of the input video signal is corrected, and image quality deterioration is suppressed (for example, Patent Document 1).

JP 2007-240804 A

  Specifically, in the method of detecting the deterioration amount as in Patent Document 1, for example, a dummy pixel for detecting the deterioration amount is provided in the display panel separately from the display pixel (correction target pixel). The correction amount is calculated based on the deterioration amount difference generated between the dummy pixel and the display pixel. In Patent Document 1, there is no particular description regarding the specific installation location of the dummy pixel. However, such a dummy pixel is adjacent to the display pixel in the peripheral portion of the image display area (effective display area), for example. It is common to be provided. In addition, it is necessary to install a luminance sensor for measuring the light emission luminance in this dummy pixel. Therefore, it is necessary to secure an installation space for pixels and sensors for detecting deterioration around the image display area, and there is a problem that the area of the frame portion of the panel screen increases.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a display panel, a module, and an electronic device capable of suppressing a reduction in image quality due to deterioration of light emission characteristics while suppressing an increase in area around the effective display region. To provide equipment.

  The display panel of the present invention has an effective display area on the surface, a substrate having a back portion on the back side in a part of the peripheral area of the effective display area, and each of which includes a light emitting element and is provided in the effective display area. A plurality of display pixels, and a plurality of deterioration detection pixels provided in the folded portion and having the same configuration as the display pixels.

  The module of the present invention includes the display panel of the present invention and a luminance sensor that acquires a luminance signal based on light emitted from the deterioration detection pixels.

  An electronic apparatus according to the present invention includes the display panel according to the present invention.

  In the display panel and module of the present invention, a part of the peripheral area of the effective display area of the substrate has a folded part toward the back side, and a plurality of deterioration detection pixels are arranged in the folded part. That is, it is not necessary to provide a space for installing the pixels for detecting deterioration on the display side (surface side of the substrate).

  According to the display panel, the module, and the electronic apparatus of the present invention, a folded portion to the back side is provided in a part of the peripheral area of the effective display area of the substrate, and the degradation detection having the same configuration as the display pixel is provided in the folded section. A plurality of pixels are arranged. This eliminates the need to secure an installation space for the deterioration detection pixels around the effective display area on the display side of the panel. Therefore, it is possible to suppress a decrease in image quality due to deterioration of the light emission characteristics while suppressing an increase in area around the effective display region.

It is sectional drawing and the top view showing schematic structure of the module which concerns on one embodiment of this invention. FIG. 2 is a functional block diagram illustrating a schematic configuration of a circuit unit illustrated in FIG. 1. It is a figure showing the whole structure of the display panel shown in FIG. 2, and a panel drive part. FIG. 3 is a functional block diagram illustrating a schematic configuration of a deterioration correction unit illustrated in FIG. 2. It is a figure for demonstrating the detection object time and correction | amendment object time of a dummy pixel signal. It is a figure for demonstrating the deterioration rate calculation procedure in a deterioration rate calculation part. It is a figure for demonstrating the deterioration rate calculation procedure in a deterioration rate calculation part. It is a figure for demonstrating the correction coefficient calculation operation | movement in a correction coefficient calculation part. It is sectional drawing and the top view showing schematic structure of the module which concerns on a comparative example. It is a figure for demonstrating the space of each peripheral region in an Example and a comparative example. 10 is a cross-sectional view illustrating a schematic configuration of a module according to Modification 1. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a module according to Modification 2. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a module according to Modification 3. FIG. It is a functional block diagram showing schematic structure of the deterioration correction part in the module shown in FIG. It is a characteristic view showing the luminance change characteristic by each temperature condition. It is a perspective view showing the external appearance of the application example 1 of the module shown in FIG. (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.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The description will be given in the following order.
1. Embodiment (an example of a module in which a folded portion is provided in a peripheral region of a display panel, and a dummy pixel and a luminance sensor are provided on a back surface of the folded portion)
2. Modification 1 (Another example of the folded portion)
3. Modification 2 (Example in which a soaking material is provided in the gap inside the folded portion)
4). Modification 3 (example in which a soaking material and a temperature sensor are provided in the gap inside the folded portion)
5). Application examples 1 to 5 (examples of electronic devices using the above modules)

<Embodiment>
[Configuration of Module 1]
1A and 1B show a schematic configuration of a module 1 according to an embodiment of the present invention. FIG. 1A is a cross-sectional view, and FIG. 1B is a plane viewed from the display screen side (front side). FIG. The module 1 includes a display panel 10, a circuit unit 11, and a luminance sensor 12. The display panel 10 includes a display pixel Pr and a dummy pixel Pd (deterioration detection pixel) on a panel substrate 10a. One surface of the display panel 10 is a display screen S, and the display screen S includes an effective display area SA and a peripheral area SB thereof.

  In the effective display area SA, a plurality of display pixels Pr are arranged in a matrix, for example. Each of the display pixels Pr is configured to perform video display by active matrix driving based on a video signal D1 (corrected video signal) described later, a timing control signal, and the like. Each display pixel Pr is, for example, one of the three primary colors of red (R), green (G), and blue (B), and includes a self-luminous element that emits light of each color, such as an organic EL element. The peripheral area SB is an area where the display pixels Pr are not arranged and is an area serving as a frame of the panel.

  The panel substrate 10a is a substrate made of, for example, polyethylene terephthalate (PET), SUS (stainless steel), polyethylene naphthalate (PEN), polyimide (PI), etc., and has a thickness of, for example, 50 μm to 1000 μm and a planar shape of, for example, a rectangular shape It has become.

  In the present embodiment, a part of the panel substrate 10a (here, the two short-side regions in the rectangular shape) is folded (bent) toward the back side (the side opposite to the display side). Is held (or fixed). That is, the panel substrate 10a has a folded portion R1 in the peripheral region SB. Further, here, the folded portion R1 is bent in an arc shape from the vicinity of the edge of the effective display area SA toward the back side, and the end portion 10a1 is held in a state of being wound up to the vicinity of the back surface of the panel substrate 10a. Has been. For example, after the display pixel Pr and the dummy pixel Pd are formed on one surface side of the flat panel substrate, the folded portion R1 is mechanically bent so that the periphery of the effective display area of the panel substrate has the above shape. To form.

  A plurality of dummy pixels Pd for detecting the deterioration of the display pixel Pr are arranged in the folded portion R1. For example, the dummy pixel Pd is provided in a line along the end portion 10a1 of the folded portion R on the same surface (continuous surface) as the display pixel Pd in the panel substrate 10a. These dummy pixels Pd have the same configuration as the display pixel Pr, that is, include light emitting elements such as organic EL elements, but are not pixels for performing video display, but light emitting characteristics of the organic EL elements in the display pixel Pr. This is for detecting deterioration (prediction detection). Specifically, although details will be described later, the dummy pixels Pd are actually caused to emit light to cause deterioration, and the deterioration rate is obtained as a sample to predict characteristic deterioration in the display pixel Pr. is there.

  The number of dummy pixels Pd is several to several tens of the display panel 10 as a whole, and signal voltages corresponding to a plurality of gradation values are applied to each of the dummy pixels Pd. . The number of dummy pixels Pd may be the same as the number of gradations in the input video signal (the number of output gradations from the panel driving unit 120). Specifically, when the number of gradations of the input video signal is 4 bits (16 gradations), a total of 16 dummy pixels Pd are provided, and each of these dummy pixels Pd corresponds to each gradation value. Apply a signal voltage. In the deterioration correction processing operation to be described later, a case where the input video signal is 4 bits and the number of dummy pixels Pd is 16 will be described as an example.

  There are various degradation detection methods using such a dummy pixel Pd. Here, as an example, a case where the dummy pixel Pd includes a reference pixel and a degradation measurement pixel will be described. In each dummy pixel Pd, the reference pixel and the deterioration measurement pixel are provided adjacent to each other, and among these, the deterioration measurement pixel is always applied with a signal voltage corresponding to a predetermined gradation value to maintain a light emitting state. It is like that. The reference pixel gives a light emission luminance that serves as a reference when calculating the deterioration rate of the light emission characteristics of the deterioration measurement pixel.

  On the light emitting surface side of each dummy pixel Pd, a luminance sensor 12 for obtaining a luminance signal based on the light emitted from the dummy pixel Pd is disposed. The luminance sensor 12 is provided in contact with or close to the dummy pixel Pd at a position where the emitted light from the dummy pixel Pd can be detected. Alternatively, when the panel substrate 10a is a transparent substrate, the luminance sensor 12 may be provided on the surface opposite to the dummy pixel Pd (the surface inside the folded portion R1) so as to sandwich the panel substrate 10a. . The luminance sensor 12 is connected to the circuit unit 11 by a wiring 13, and the luminance signal acquired by the luminance sensor 12 is input to a deterioration correction unit 110 (described later) in the circuit unit 11 as a dummy pixel signal D10. It is like that. Hereinafter, detailed configurations of the circuit unit 11 and the display panel 10 will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a functional block diagram of the circuit unit 11. The circuit unit 11 performs display driving of the display panel 10 and performs processing for correcting the gradation value of the input video signal based on the dummy pixel signal D10 (hereinafter simply referred to as “degradation correction processing”). For example, as illustrated in FIG. 2, the circuit unit 11 includes a deterioration correction unit 110 and a panel driving unit 120. The deterioration correction unit 110 generates a video signal D1 by performing deterioration correction processing, and the panel driving unit 120 drives each display pixel Pr of the display panel 10 using the video signal D1. Although not shown, the circuit unit 11 also performs drive control of the dummy pixel Pd and the luminance sensor 12.

  FIG. 3 shows a detailed configuration of the display panel 10 and the panel driving unit 120. Thus, in the display panel 10, the plurality of scanning lines WSL arranged in rows, the plurality of signal lines DTL arranged in columns, and the plurality of power supply lines DSL arranged in rows along the scanning lines WSL. The scanning line WSL, the signal line DTL, and the power supply line DSL are each connected to the panel driving unit 120. Each display pixel Pr is provided corresponding to the intersection of each scanning line WSL and each signal line DTL. Accordingly, the panel driving unit 120 performs display driving by sequentially selecting a plurality of display pixels Pr and writing a video signal voltage based on the video signal D1 to the selected display pixels Pr. Yes. As with the display pixel Pr, each dummy pixel Pd is also connected to the panel drive unit 120 (dotted line in FIG. 3), and a predetermined signal voltage is applied to each. The panel driving unit 120 includes a video signal processing circuit 121, a timing generation circuit 122, a scanning line driving circuit 123, a signal line driving circuit 124, and a power supply line driving circuit 125.

  The video signal processing circuit 21 performs gamma correction, overdrive correction, and the like on the input digital video signal D1, and outputs the corrected video signal 121A to the signal line drive circuit 124. The timing generation circuit 122 generates and outputs the control signal 122A based on the synchronization signal D1a input from the outside, so that the scanning line driving circuit 123, the signal line driving circuit 124, and the power line driving circuit 125 are interlocked with each other. Control to operate. The scanning line driving circuit 123 sequentially selects a plurality of display pixels Pr by sequentially applying selection pulses to the plurality of scanning lines WSL in accordance with the control signal 122A. The signal line driving circuit 124 generates an analog video signal corresponding to the video signal 121A in accordance with the control signal 122A and applies it to each signal line DTL, whereby the display pixel Pr selected by the scanning line driving circuit 123 is applied. The video signal is written. The power supply line driving circuit 25 controls the light emitting operation and the quenching operation of the organic EL elements in each display pixel Pr by sequentially applying control pulses to the plurality of power supply lines DSL in accordance with the control signal 122A. .

[Operation and effect of module 1]
(1. Display operation)
In the module 1, the panel driving unit 120 performs display driving of each display pixel Pr in the display panel 10 based on the video signal D1 and the synchronization signal D1a. As a result, a drive current is injected into the organic EL element in each display pixel Pr, and holes and electrons are recombined to emit light. The emitted light is taken out to display an image on the display panel 10.

(2. Deterioration correction operation)
In this module 1, the current-voltage (IV) characteristic of the organic EL element in each display pixel Pr deteriorates with time with video display, and the light emission luminance easily changes accordingly. Therefore, a desired light emission luminance cannot be achieved for the input video signal, and the image quality is deteriorated. Therefore, in the present embodiment, in order to suppress the deterioration of the image quality due to the deterioration of the light emission characteristics, the deterioration of each display pixel Pr is detected and the amount of the deterioration is fed back to the input video signal, so that the level of the input video signal is A deterioration correction process for correcting the tone value is performed. At that time, the display panel 10 (panel substrate 10a) is provided with a dummy pixel Pd for detecting deterioration separately from the display pixel Pr, and the deterioration rate of the display pixel Pr is determined using the deterioration rate generated in the dummy pixel Pd. Predict.

  Hereinafter, an example of the deterioration correction processing operation will be described with reference to FIG. The degradation correction unit 110 calculates the degradation rate of the light emission characteristics based on the dummy pixel signal D10, and generates the video signal D1 by correcting the gradation value of the input video signal D0 based on the degradation rate. The degradation correction unit 110 includes, for example, a degradation rate calculation unit 111, a correction coefficient calculation unit 112, a correction calculation unit 113, and a video signal integration unit 114.

(2-1. Detection of dummy pixel signal D10)
First, the luminance sensor 12 detects a dummy pixel signal D10 from each dummy pixel Pd. Specifically, the circuit unit 11 maintains each dummy pixel Pd in a light emitting state, and a luminance signal based on the emitted light is acquired by the luminance sensor 12 as a dummy pixel signal D10. At this time, for example, signal voltages (for example, 16 types of signal voltages in 1-bit increments) corresponding to each gradation value of the input video signal are applied to each of the 16 dummy pixels Pd to emit light. Each dummy pixel Pd is composed of, for example, a reference pixel and a deterioration measurement pixel as described above. By continuously applying each signal voltage as described above to the deterioration measurement pixel among these, each deterioration is caused. In the measurement pixel, the light emission state corresponding to each gradation value is always maintained. On the other hand, a signal voltage having the same value as that of a pair of deterioration measurement pixels is applied to the reference pixel only when the luminance signal at the reference pixel is measured. That is, the reference pixel is turned off except during measurement, so that a reference level with little deterioration is maintained. Hereinafter, for the sake of convenience, these 16 dummy pixels Pd are referred to as dummy pixels Pd1 to Pd16, and the dummy pixel signals D10 detected from these dummy pixels Pd1 to Pd16 are described as dummy pixel signals D10 (1) to D10 (16). To do.

  FIG. 5 is a diagram for explaining the detection timing of the dummy pixel signal D10 and the correction coefficient acquisition (update) timing in the deterioration correction processing. As shown in FIG. 5, the acquisition of the correction coefficient K in the deterioration correction process is performed at time T1, T2, T3,... Every correction target time ΔT and within the correction target time ΔT in increments of detection target time Δt ( The dummy pixel signal D10 is detected at timings t0, t1,... Tn,.

  That is, all 16 patterns of dummy pixel signals D10 (1) to D10 (16) from the brightest white display to the darkest black display are detected every detection target time Δt. The dummy pixel signals D10 (1) to D10 (16) detected from each dummy pixel Pd at each timing are sequentially output to the deterioration rate calculation unit 111 or stored in a storage unit (semiconductor memory or the like) (not shown). . Hereinafter, specific operations in each part of the deterioration correction unit 110 will be described.

(2-2. Deterioration rate calculation unit 111)
(Dummy signal integrated value calculation)
Subsequently, for each pattern of the dummy pixel signals D10 (1) to D10 (16), at each timing (t0, t1,..., Tn,...), Each dummy pixel Pd (specifically, each dummy pixel Pd). The integrated value of the signal voltage applied to the deterioration measurement pixel in the pixel Pd) is calculated. That is, at timing tn, all the dummy pixel signals D10 (1) detected from timing t0 to tn are added together, and all dummy pixel signals D10 (2) detected from time 0 to tn are similarly added. , D10 (3), D10 (4), D10 (5),..., D10 (16). Thus, 16 patterns of signal integrated values (hereinafter referred to as dummy signal integrated values) are obtained at a certain timing tn.

  Such a dummy signal integrated value calculation process is performed at each timing within the correction target time ΔT. Thereby, when the number of patterns of the dummy pixel signal D10 is A, the dummy signal integrated value of the number of patterns represented by A × (ΔT / Δt) can be obtained within the correction target time ΔT. For example, if the number of patterns A of the dummy pixel signal D10 is 16, the correction target time ΔT is 1 hour (60 minutes), and the detection target time Δt is 1 minute, the dummy signal integrated value of 16 × 60 = 960 patterns is obtained. Will be obtained.

(Calculation of deterioration rate in dummy pixel Pd)
Further, along with the calculation of the dummy signal integrated value as described above, the deterioration rate of the light emission characteristic at each timing (t0, t1,...) Within the correction target time ΔT is expressed by the dummy pixel signals D10 (1) to D10 (16). Calculate for each. That is, the deterioration rate corresponding to each dummy signal integrated value is calculated. The deterioration rate corresponding to the dummy signal integrated value is, for example, the timing of the same dummy pixel Pd when the dummy signal integrated value is the signal integrated value from timing t0 to tn in a certain dummy pixel Pd. It is the deterioration rate at time tn.

For example, the deterioration rate is calculated as follows. That is, the dummy pixel signals D10 (1) to D10 (16) specifically include a luminance signal corresponding to the deterioration measurement pixel and a luminance signal corresponding to the reference pixel. Calculate by comparison. For example, in the actual emission luminance of the deterioration measurement pixel in each dummy pixel, the change with respect to the reference pixel increases with time (FIG. 6A), and therefore the change in luminance with respect to the reference pixel is calculated as the deterioration rate. That is, the deterioration rate is expressed by the following equation (A) and shows a characteristic diagram as shown in FIG. However, the deterioration rate here is the ratio of the emission luminance of the deterioration measurement pixel to the reference pixel at a certain timing.
(Deterioration rate) = (Emission luminance of degradation measurement pixel) / (Emission luminance of reference pixel) (A)

  FIG. 7 shows the light emission characteristics of the dummy pixels Pd1 to Pd16. Thus, it can be seen that the dummy pixel Pd1 that emits the brightest light has the largest deterioration rate, and the deterioration rate becomes smaller as it becomes darker. In other words, it can be seen that the light emission characteristics of the organic EL element not only change with time but also vary depending on the value of the applied signal voltage (signal integrated value). Therefore, at each timing (t0, t1,..., Tn,...), The deterioration rate is calculated for all of the dummy pixel signals D10 (1) to D10 (16). A deterioration rate of the number of patterns represented by × (ΔT / Δt) is obtained. As a result, a data group (correction coefficient calculation data group D11) including dummy signal integrated values and deterioration rates of a plurality of patterns is obtained. The correction coefficient calculation data group D11 is output to the correction coefficient calculation unit 112 and then stored in, for example, a pattern holding unit (not shown) provided in the correction coefficient calculation unit 112.

(2-3. Video signal integrating unit 114)
On the other hand, the video signal integration unit 114 calculates the video signal integration value by integrating the video signal D1 supplied to each display pixel Pr for each of all display pixels Pr during the correction target time ΔT. However, the video signal D1 to be integrated is a video signal corrected using the correction coefficient K calculated in the correction target period ΔT that is temporally previous (details will be described later). The calculated video signal integrated value data D14 for all display pixels Pr is output to the correction coefficient calculation unit 112.

(2-4. Correction coefficient calculation unit 112)
The correction coefficient calculation unit 112 calculates the correction coefficient K using the correction coefficient calculation data group D11 obtained as described above and the video signal integration value data D14 input from the video signal integration unit 114. . Specifically, first, from the group of dummy signal integrated values in the correction coefficient calculation data group D11, a dummy signal integrated value having a value (or the same value) closest to the video signal integrated value in each display pixel Pr is calculated. select. Then, the deterioration rate corresponding to the selected dummy signal integrated value is predicted as the deterioration rate in each display pixel Pr.

  That is, since the deterioration rate of the light emission characteristics of the organic EL element changes according to the signal integrated value applied as described above, the integrated value of the video signal D1 actually supplied to each display pixel Pr and the dummy at a certain timing. When the signal integrated value is close (or the same), it can be predicted that the deterioration rate of the display pixel Pr is comparable to the deterioration rate of the dummy pixel Pd at a certain timing.

  For this reason, it is desirable that the number of patterns in the correction coefficient calculation data group D11 is as large as possible. For example, as described above, when the number of patterns A of the dummy pixel signal D10 is 16, the correction target time ΔT is 1 hour, and the detection target time Δt is 1 minute, the number of patterns in the correction coefficient calculation data group D11 is Since there are 960 patterns, it is easy to approximate the video signal integrated value and the dummy signal integrated value, and the deterioration rate detection accuracy is improved.

Subsequently, the correction coefficient K is calculated based on the deterioration rate selected as described above. Although the calculation method of the correction coefficient K is not particularly limited, for example, as shown in FIGS. 8A and 8B, the reciprocal of the selected deterioration rate is set as the correction coefficient K. That is, the correction coefficient K is expressed by the following equation (B). The correction coefficient K calculated in this way is output to the correction calculation unit 113 as correction coefficient data D12.
(Correction coefficient K) = (light emission luminance of reference pixel) / (light emission luminance of deterioration measurement pixel) (B)

(2-5. Correction calculation unit 113)
The correction calculation unit 113 performs a correction calculation process using the correction coefficient K calculated by the correction coefficient calculation unit 112 on the input video signal D0. Specifically, the gradation value of the input video signal D0 is multiplied by the correction coefficient K expressed by the above formula (B). As a result, a video signal D1 to be supplied to each display pixel Pr of the display panel 10 is generated. The generated video signal D1 is output to the panel drive unit 120 and also output to the video signal integration unit 114.

  As described above, the deterioration of the light emission characteristic in the display pixel Pr is detected based on the dummy pixel signal D10, and the gradation value of the input video signal D0 is corrected using the correction coefficient K corresponding to the deterioration. At this time, the correction coefficient K is calculated (updated) every correction target time ΔT. Further, the correction coefficient K (1) calculated at a certain correction target time ΔT (for example, time T1 to T2 in FIG. 5) is deteriorated with respect to the input video signal D0 input at the next correction target time ΔT (time T2 to T3). Used for correction. However, during the correction target time ΔT (time 0 to T1) immediately after the start of use of the display panel, the correction coefficient has not been acquired, so that the input video signal D0 is output to the display panel 10 without being corrected.

  As described above, in the display panel 10, by providing the dummy pixel Pd separately from the display pixel Pr, it is possible to detect the deterioration of the display pixel Pr. In addition, this makes it possible to correct the input video signal D0 and suppress deterioration in image quality due to deterioration in characteristics of the light emitting elements.

However, such a dummy pixel Pd, as generally shown in FIG. 9, in the flat panel substrate 100, that is more provided in the peripheral region SB ₁₀₀ in the effective display area SA ₁₀₀ of the display screen S Many. Further, a luminance sensor 102 connected to the circuit unit 101 by a wiring 103 is disposed on each dummy pixel Pd. However, in this case, the area of the frame portion of the panel is increased by the installation space of the dummy pixel Pd. Further, since the luminance sensor 102 is installed on the dummy pixel Pd, the luminance sensor 102 protrudes toward the display side, and unevenness is generated in the frame portion.

On the other hand, in the present embodiment, as shown in FIGS. 1A and 1B, a folded portion formed by folding a part of the panel substrate 10a to the back side in the peripheral area SB of the display screen S. R1 is provided, and a plurality of dummy pixels Pd are arranged in the folded portion R1. Thereby, on the display side, it is not necessary to secure an installation space for the dummy pixels Pd in the peripheral area SB. Therefore, as compared with the case of providing the dummy pixel Pd in the peripheral area SB ₁₀₀ of a flat panel substrate 100 (width d ₁₀₀ of FIG. 10 (B)), the present embodiment provided on the folded portion R1 of the peripheral region SB ( The area of the frame portion can be reduced with the width d) in FIG. Therefore, in the display screen S, it is possible to suppress a decrease in image quality due to deterioration of the light emitting element while suppressing an increase in area around the effective display area SA.

  Further, in the present embodiment, since the luminance sensor 12 is also provided in the vicinity of the dummy pixel Pd provided in the folded portion R1, a flat display screen S is realized without causing unevenness due to the luminance sensor 12 on the display side. can do.

  Next, modified examples (modified examples 1 to 3) of the module according to the above embodiment will be described. Below, the same code | symbol is attached | subjected about the component similar to the module 1 of the said embodiment, and description is abbreviate | omitted suitably.

(Modification 1)
FIG. 11 illustrates a cross-sectional configuration of the module 2 according to the first modification. Similar to the module 1 of the above-described embodiment, the module 2 includes a display panel in which the display pixels Pr and the dummy pixels Pd are disposed on the panel substrate 10a, a circuit unit 11, and a luminance sensor 12. In addition, the display pixel Pr is provided in the effective display area SA of the display screen S, and the folded part R2 is provided in the peripheral area SB, and the dummy pixel Pd is provided in the folded part R2. Similar to the above-described embodiment, the folded portion R2 is held (or fixed) in a state in which a part of the panel substrate 20a is bent to the back side. The panel substrate 20a is made of the same material and thickness as the panel substrate 10a of the above embodiment.

  However, in this modification, the shape of the folded portion R2 is different from the shape of the folded portion R1 of the above embodiment. Specifically, the folded portion R2 is bent in an arc shape from the vicinity of the edge of the effective display area SA of the panel substrate 20a, but the curvature of the curved surface is smaller than that of the folded portion R1 of the above embodiment. Yes. Further, a part of the folded portion R2 on the end 20a1 side is held along a direction parallel to the back surface of the panel substrate 20a, and the entire folded portion R2 has a U-shape. A plurality of dummy pixels Pd are provided in a line along the end 20a1 of the folded portion R2, and the luminance sensor 12 is disposed on each dummy pixel Pd. The luminance sensor 12 is connected to the circuit unit 11 by a wiring 21.

  Thus, the shape of the folded portion R2 may be U-shaped, and the curvature of the curved surface portion is not particularly limited. Further, the folded shape of the folded portion does not necessarily have to be an arc shape, and may be bent into a square “U” shape or “V” shape. Alternatively, a part of the panel substrate may be folded to the back side, and the panel substrates may be overlapped in the peripheral region SB. In any case, as long as the folded portion has a shape in which the panel substrate is folded to the back side, and the dummy pixel Pd is provided in the folded portion, the same effect as in the above embodiment is obtained. Obtainable.

(Modification 2)
FIG. 12 illustrates a cross-sectional configuration of the module 3 according to the second modification. Similar to the module 2 of the first modification, the module 3 includes a display panel in which the display pixels Pr and the dummy pixels Pd are arranged on the panel substrate 20a, a circuit unit 11, and a luminance sensor 12. Further, in the display screen S, the display pixel Pr is provided in the effective display area SA, the U-shaped folded portion R2 is formed in the peripheral area SB, and the dummy pixel Pd is provided in the folded portion R2. Yes. A luminance sensor 12 is disposed on the dummy pixel Pd, and the luminance sensor 12 is connected to the circuit unit 11 by a wiring 21.

  However, in the present modification, a heat-equalizing material 30 (heat conduction member) having thermal conductivity is inserted in a gap R2a inside the folded portion R2 (a region sandwiched by bending the panel substrate 20a). The soaking material 30 is provided in close contact with the back surface of the opposing panel substrate 20a in the gap R2a. An example of the soaking material 30 is heat dissipating grease containing silicon or the like. In FIG. 12, the heat equalizing material 30 is provided in a part of the gap R2a (part on the end 20a1 side), but the heat equalizing material 30 is formed so as to fill the gap R2a without any gap. Also good. Further, in the panel surface, it may be provided in a partly scattered manner corresponding to the installation area of the dummy pixels Pd, or linearly along a line in which the plurality of dummy pixels Pd are arranged. It may be provided.

  In the present modification, the same effects as those of the above-described embodiment can be obtained by such a configuration, and dummy members disposed at positions separated from each other by providing the heat equalizing material 30 inside the folded portion R2. Each temperature condition of the pixel Pd and the display pixel Pr can be made substantially the same.

  Here, FIG. 13 shows temporal changes in the light emission luminance of the organic EL element under three temperature conditions (low, medium (standard), and high). In the above-described embodiment, it has already been described that the light emission luminance varies not only with the change with time but also with the integrated signal value. However, as shown in FIG. 13, the light emission luminance further varies with the temperature condition. Specifically, the brightness decrease tends to be larger than usual (standard) under high temperature conditions, and the brightness decrease tends to be smaller than normal (standard) under low temperature conditions.

  Therefore, as described above, since the temperature conditions in the display pixel Pr and the dummy pixel Pd are substantially the same, the deterioration detection accuracy of the display pixel Pr using the dummy pixel Pd can be improved. Therefore, the same effect as that of the above embodiment can be obtained, and a higher quality image display can be realized.

(Modification 3)
FIG. 14 illustrates a cross-sectional configuration of the module 4 according to the third modification. This module 4 has a configuration in which the temperature sensor 40 is further disposed in the gap R2a of the folded portion R2 in the configuration of the module 3 of the second modification. For example, the temperature sensor 40 is embedded in the soaking material 30 in the gap R <b> 2 a and is connected to the circuit unit 11 by the wiring 22. The circuit unit 11 includes a deterioration correction unit 130 and a panel driving unit 120 as in the above embodiment. The deterioration correcting unit 130 corrects the input video signal D0 based on the deterioration rate, and the panel driving unit 120 performs display driving of the display pixel Pr using the corrected video signal D1.

  In this modification, the deterioration correction unit 130 performs the deterioration correction process using the temperature data obtained by the temperature sensor 40 together with the luminance signal obtained from the luminance sensor 12. FIG. 15 shows a functional block diagram of the deterioration correction unit 130. As described above, the deterioration correction unit 130 includes, for example, the deterioration rate calculation unit 111, the correction coefficient calculation unit 131, the correction calculation unit 113, and the video signal integration unit 114.

  The deterioration rate calculation unit 111 calculates a dummy signal integrated value together with the deterioration rate based on the dummy pixel signal D10, and outputs these to the correction coefficient calculation unit 131 as a correction coefficient calculation data group D11, as in the above embodiment. . Similarly to the above embodiment, the video signal integration unit 114 calculates the video signal integration value using the video signal D1, and outputs these to the correction coefficient calculation unit 131 as video signal integration value data D14.

  Then, the correction coefficient calculation unit 131 calculates the correction coefficient K using the correction coefficient calculation data group D11 and the video signal integrated value data D14. At this time, in this modification, the temperature data D20 obtained from the temperature sensor 40 is input to the correction coefficient calculation unit 131, and the correction coefficient K is calculated in consideration of the environmental temperature. That is, for example, the correction coefficient K represented by the above formula (B) is further corrected according to the temperature condition. For example, the correction coefficient calculation unit 131 holds a table for correcting the correction coefficient K to an appropriate value based on the temperature condition, and using this table, the correction coefficient K based on the input temperature data D20. Perform the correction. As described above, the deterioration of the light emission characteristic is large under high temperature conditions and is small under low temperature conditions. Therefore, by calculating (correcting) the correction coefficient K in consideration of the characteristic change due to such temperature conditions. Deterioration correction accuracy is improved. Therefore, an effect equivalent to that of the above-described embodiment can be obtained, and an image display with higher image quality than that of Modification 2 can be realized by using the temperature condition as a calculation parameter when calculating the correction coefficient.

  In the third modification, the case where the temperature sensor 40 is embedded in the soaking material 30 has been described as an example, but the installation location of the temperature sensor 40 is not particularly limited. For example, the temperature sensor 40 may be disposed in contact with the surface of the soaking material 30 or may be disposed in the vicinity of the soaking material 30. Further, the soaking material 30 is not necessarily provided, that is, the temperature sensor 40 may be disposed inside or in the vicinity of the folded portion of the module in the above-described embodiment or modification 1.

<Application example>
Next, with reference to FIGS. 16 to 20, application examples (application examples 1 to 5) of the modules (modules 1 to 4) described in the above embodiment and modification examples 1 to 3 will be described. As will be described below, these modules can be applied to electronic devices in various fields that display a video signal input from the outside or a video signal generated inside as an image or video. Hereinafter, the module 1 will be described as an example.

(Application example 1)
FIG. 16 illustrates the appearance of a television device. This television apparatus has, for example, a video display screen unit 300 including a front panel 310 and a filter glass 320, and the module 1 is incorporated in the video display screen unit 300.

(Application example 2)
FIG. 17 shows the appearance of a digital camera. 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, and the module 1 is incorporated in the display unit 420.

(Application example 3)
FIG. 18 shows the appearance of a notebook personal computer. The notebook personal computer has, 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 module 1 is incorporated in the display unit 530.

(Application example 4)
FIG. 19 shows the appearance of the video camera. This video camera includes, for example, a main body 610, a subject photographing lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of photographing, and a display 640. The module 1 is incorporated in the display unit 640.

(Application example 5)
FIG. 20 shows the appearance of a mobile phone. 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. Of these, the module 1 is incorporated in the display 740 or the sub-display 750.

  While the present invention has been described with reference to the embodiments and modifications, the present invention is not limited to these embodiments and the like, and various modifications can be made. For example, in the above-described embodiment and the like, the folded portion formed by folding a part of the rectangular short side of the panel substrate is described as an example, but the folded portion is formed by folding the other portion of the panel substrate to the back side. May be formed. For example, the folded portion may be formed by bending the long side of the rectangular shape of the panel substrate to the back side. In addition, it is not always necessary to provide the two rectangular opposite sides, and it may be provided on any one side or all four sides of the rectangular shape.

  In the above-described embodiment and the like, the case where the dummy pixel Pd is provided on the same surface (continuous surface) as the display pixel Pr on the panel substrate has been described as an example, but the surface on which the dummy pixel Pd is provided. May not necessarily be the same surface as the display pixel Pr (surface outside the folded portion). That is, the dummy pixel Pd may be provided on a surface different from the display pixel Pr (surface inside the folded portion).

  Further, in the above-described embodiment and the like, the case where the timing generation circuit 22 controls the driving operation in the scanning line driving circuit 23, the signal line driving circuit 24, and the power supply line driving circuit 25 has been described. The drive operation may be controlled. The scanning line driving circuit 23, the signal line driving circuit 24, and the power supply line driving circuit 25 may be controlled by hardware (circuit) or software (program). May be.

  DESCRIPTION OF SYMBOLS 1-4 ... Module, 10 ... Display panel, 10a, 20a ... Panel board | substrate, 11 ... Circuit part, 12 ... Luminance sensor, 13, 21, 22 ... Wiring, 110, 130 ... Deterioration correction part, 111 ... Deterioration rate calculation part 112, 131 ... correction coefficient calculation unit, 113 ... correction operation unit, 114 ... video signal integration unit, 120 ... panel drive unit, 121 ... video signal processing circuit, 122 ... timing generation circuit, 123 ... scanning line drive circuit, 124 ... Signal line drive circuit, 125 ... Power supply line drive circuit, R1, R2 ... Folding part, Pr ... Display pixel, Pd ... Dummy pixel, D0 ... Input video signal, D1 ... Video signal, WSL ... Scanning line, DTL ... Signal line DSL ... Power line.

Claims (6)

A substrate having an effective display area on the surface, and having a folded portion on the back side in a part of a peripheral area of the effective display area;
A plurality of display pixels each including a light emitting element and provided in the effective display area;
A display panel comprising a plurality of deterioration detection pixels provided in the folded portion, each having the same configuration as each display pixel. A substrate having an effective display area on the surface, and having a folded portion on the back side in a part of a peripheral area of the effective display area;
A plurality of display pixels each including a light emitting element and provided in the effective display area;
A plurality of deterioration detection pixels provided in the folded portion, each having the same configuration as each display pixel;
And a luminance sensor that is provided opposite to each of the plurality of deterioration detection pixels and that acquires a luminance signal based on light emitted from each of the deterioration detection pixels. A deterioration correction unit that corrects the gradation value of the input video signal in accordance with the deterioration of the light emission characteristics of each display pixel,
The deterioration correction unit is
A deterioration rate calculation unit that calculates a deterioration rate in each deterioration detection pixel based on the luminance signal obtained from the luminance sensor;
A correction coefficient calculation unit that calculates a correction coefficient for correcting the input video signal based on the deterioration rate calculated by the deterioration rate calculation unit;
The module according to claim 2, wherein the input video signal is corrected based on the correction coefficient calculated by the correction coefficient calculation unit. The module according to claim 3, wherein a heat conducting member is inserted inside the folded portion. A temperature sensor is further provided inside or near the folded portion,
The module according to claim 3, wherein the correction coefficient calculation unit calculates the correction coefficient in consideration of a temperature detected by the temperature sensor. A substrate having an effective display area on the surface, and having a folded portion on the back side in a part of a peripheral area of the effective display area;
A plurality of display pixels each including a light emitting element and provided in the effective display area;
An electronic apparatus including a display panel provided in the folded portion and having a plurality of deterioration detection pixels each having the same configuration as each display pixel.

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