Display device

Abstract

The present technology pertains to a display device that can suppress the effect of deterioration of elements of a display panel. There is provided a display apparatus including: a signal processing circuit configured to process a video signal; and a display panel configured to display a video based on the video signal, in which the signal processing circuit is configured to acquire a cumulative load increase amount according to a load increase amount of the display panel caused by a brightness enhancement, control a brightness of the video signal with reference to the acquired cumulative load increase amount, and display the video based on the video signal. And limiting the length of time for which the brightness enhancement is performed.

Description

[0001] This application is a divisional application of the patent application with application number 202180030645.8 and invention name “Signal processing device, signal processing method and display device”, whose international application date is April 19, 2021 and international application number is PCT / JP2021 / 015796, which entered the national stage on October 24, 2022. The entire contents of the application are incorporated herein by reference. Technical Field

[0002] The present technology relates to a signal processing device, a signal processing method, and a display device, and more particularly, to a signal processing device, a signal processing method, and a display device capable of reducing the influence of element degradation of a display panel. Background Art

[0003] In recent years, self-luminous display devices such as OLED display devices are becoming the mainstream of display devices for displaying videos. For example, PTL 1 discloses a technology for enhancing the brightness of a display panel as a technology related to a display device such as a self-luminous display device.

[0004] [Citation List]

[0005] [Patent Document]

[0006] [PTL 1]

[0007] Japanese Patent Laid-Open No. 2015-94795 Summary of the invention

[0008] [Technical issues]

[0009] Incidentally, regarding the display device, it is necessary to reduce the influence of element degradation of the display panel while enhancing the brightness of the display panel.

[0010] The present technology has been made in view of such circumstances, and makes it possible to reduce the influence of element degradation of a display panel.

[0011] [Solution to the problem]

[0012] According to one aspect of the present technology, a signal processing device is provided, comprising: a signal processing unit, configured to obtain a cumulative load increase amount obtained by measuring and accumulating an increase in load on a display panel caused by brightness enhancement when a video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement; and to adaptively control a first gain for increasing the brightness of the video signal according to a degree of influence of degradation of an element of the display panel, with reference to the obtained cumulative load increase amount.

[0013] According to one aspect of the present technology, a signal processing method is provided, comprising: obtaining, by a signal processing device, a cumulative load increase amount obtained by measuring and accumulating the increase amount of load on a display panel caused by brightness enhancement when a video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement, and adaptively controlling a first gain for increasing the brightness of the video signal according to the degree of influence of degradation of an element of the display panel with reference to the obtained cumulative load increase amount.

[0014] In a signal processing device and a signal processing method according to aspects of the present technology, when a video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement, a cumulative load increase is obtained by measuring and accumulating the increase in load on the display panel caused by the brightness enhancement, and with reference to the obtained cumulative load increase, a first gain for increasing the brightness of the video signal is adaptively controlled according to the degree of influence of degradation of elements of the display panel.

[0015] According to one aspect of the present technology, a display device is provided, comprising: a panel unit, the panel unit comprising a display panel; and a signal processing unit configured to process a video signal, wherein the signal processing unit is configured to obtain a cumulative load increase amount obtained by measuring and accumulating an increase in load on the display panel caused by brightness enhancement when the video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement; and to adaptively control a first gain for increasing the brightness of the video signal according to the degree of influence of degradation of an element of the display panel, with reference to the obtained cumulative load increase amount.

[0016] In a display device according to aspects of the present technology, when a video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement, a cumulative load increase is obtained by measuring and accumulating the increase in load on the display panel caused by the brightness enhancement, and with reference to the obtained cumulative load increase, a first gain for increasing the brightness of the video signal is adaptively controlled according to the degree of influence of degradation of elements of the display panel.

[0017] The signal processing device and the display device according to aspects of the present technology may be independent devices or internal blocks of a single device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Graphs illustrating an exemplary brightness enhancement process are described.

[0019] Figure 2 : is a block diagram showing a configuration example of a display device to which an embodiment of the present technology is applied.

[0020] Figure 3is a block diagram showing a detailed configuration example of the signal processing unit.

[0021] Figure 4 : is a diagram showing an example of how the load increase amount measuring / accumulating unit measures / accumulates the load increase amount.

[0022] Figure 5 is a diagram showing a first exemplary cumulative added value based on the load increase amount.

[0023] Figure 6 is a diagram showing a second exemplary cumulative added value based on the load increase amount.

[0024] Figure 7 is a diagram showing a configuration example including a single temperature sensor provided on a panel unit.

[0025] Figure 8 is a diagram showing a configuration example including a plurality of temperature sensors provided on a panel unit.

[0026] Fig. 9 is a diagram showing an example of how to set the gain with respect to the cumulative load increase amount.

[0027] Fig.10 : is a flowchart showing the flow of the brightness enhancement gain control process. DETAILED DESCRIPTION

[0028] <1. Embodiments of the present technology>

[0029] A technology for enhancing the brightness of a display device (such as an OLED display device) includes detecting a video signal switching from a low-brightness display signal (low-brightness signal) to a high-brightness display signal (high-brightness signal) and controlling a brightness enhancement gain with reference to an increased integral value (see PTL 1 above).

[0030] Figure 1 An exemplary brightness enhancement process to which this brightness enhancement technique is applied is shown. Figure 1 In FIG. 1 , A shows the relationship between the input video signal and the integrated value by the bold line L11 and the bold line L12 on the same time axis.

[0031] exist Figure 1 In FIG. 1 , B shows the relationship between the gain by which the video signal is to be multiplied and the integrated value by the bold line L13 and the bold line L14 on the same time axis. Figure 1 In FIG. 1 , C shows the relationship between the output video signal obtained by multiplying the input video signal by the gain and the integrated value by the bold line L15 and the bold line L16 on the same time axis.

[0032] In use Figure 1In the case of the brightness enhancement processing shown in , each brightness enhancement time period of the high brightness signal can be controlled. However, even when each time period is short, the accumulated brightness enhancement time increases with the long-term continuous use of the display panel. Therefore, there is a problem of burn-in due to degradation of the elements in the display panel of the display device.

[0033] The present technology proposes a technology for solving problems in long-term reliability of a display panel, such as burn-in caused by degradation of problematic elements that occur when the brightness of the display panel is enhanced as described above. Now, embodiments of the present technology are described with reference to the accompanying drawings.

[0034] (Device Configuration)

[0035] Figure 2 A configuration example of a display device to which an embodiment of the present technology is applied is shown.

[0036] The display device 1 is a self-luminous display device such as an OLED display device including an OLED display panel. The display device 1 is configured as a television receiver or the like.

[0037] exist Figure 2 In the embodiment, the display device 1 includes a signal input unit 110 , a signal processing unit 111 , a panel driving unit 112 , and a panel unit 113 .

[0038] The signal input unit 110 includes a tuner connected to an antenna, a communication module connectable to the Internet or other communication networks, an input interface conforming to a predetermined standard, and the like.

[0039] The signal input unit 110 provides the signal processing unit 111 with video signals of various types of contents, such as broadcast contents transmitted through terrestrial broadcasting or satellite broadcasting, communication contents transmitted through streaming via the Internet or other communication networks, or recorded contents recorded on a recording medium (such as an optical disk or a semiconductor memory or a recorder).

[0040] The signal processing unit 111 performs video signal processing on the video signal of the content supplied from the signal input unit 110 and supplies the video signal obtained thereby to the panel driving unit 112. In the video signal processing, brightness enhancement processing for changing the video signal from a low brightness display signal (low brightness signal) to a high brightness display signal (high brightness signal) or the like is performed.

[0041] The panel driving unit 112 drives the panel unit 113 according to the video signal supplied from the signal processing unit 111 .

[0042] The panel unit 113 includes a display panel such as an OLED display panel. The panel unit 113 is driven by the panel driving unit 112 to display a video based on a video signal of various types of content.

[0043] An OLED display panel is a display panel in which pixels including an OLED element as a self-luminous element are arranged two-dimensionally. An OLED (Organic Light Emitting Diode) is a light emitting element having a structure in which an organic light emitting material is sandwiched between a cathode and an anode and forms each pixel (display pixel) arranged two-dimensionally in an OLED display panel.

[0044] In a WRGB OLED panel, each pixel (display pixel) includes four sub-pixels: white (W), red (R), green (G), and blue (B). In an RGB OLED panel, each pixel (display pixel) includes three sub-pixels: red (R), green (G), and blue (B).

[0045] It should be noted that in Figure 2 In the configuration shown in , for simplicity of description, bare minimum components are shown, but other circuits or devices may also be included, for example, a sound signal processing circuit configured to process a sound signal or a speaker configured to output sound based on the sound signal.

[0046] Figure 3 Shows Figure 2 A detailed configuration example of the signal processing unit 111 is shown in FIG.

[0047] exist Figure 3 In the embodiment, the signal processing unit 111 includes a brightness enhancement reference gain calculation unit 131, a load increase amount measurement / accumulation unit 132, a nonvolatile memory 133, a brightness enhancement gain calculation unit 134, an addition unit 135, and a multiplication unit 136.

[0048] In the signal processing unit 111 , the input video signal from the signal input unit 110 is supplied to each of the brightness improvement reference gain calculation unit 131 , the load increase amount measurement / accumulation unit 132 , and the multiplication unit 136 .

[0049] The brightness boost reference gain calculation unit 131 performs brightness boost reference gain calculation processing according to the video signal input thereto and supplies the brightness boost reference gain obtained thereby to the brightness boost gain calculation unit 134. The brightness boost reference gain is a gain used as a reference for brightness boost gain calculation.

[0050] The load increase amount measuring / accumulating unit 132 performs cumulative added value calculation processing and accumulation processing based on the video signal input thereto and the brightness increase factor, and supplies the accumulated value of the cumulative load increase amount obtained thereby to the brightness increase gain calculating unit 134. As the brightness increase factor, the brightness increase factor based on the gain by which the input video signal is multiplied is fed back as input.

[0051] Reference later Figures 4 to 6 Details of the cumulative added value calculation process and the accumulation process are described. In order to store the accumulation value data when the accumulation process is performed, a nonvolatile memory 133 such as an EEPROM (Electrically Erasable Programmable Read Only Memory) is provided.

[0052] Furthermore, the load increase amount measurement / accumulation unit 132 may perform the cumulative added value calculation process by considering at least one of the measurement result of the surface temperature of the display panel and the measurement result of the current flowing through the display panel supplied from the panel drive unit 112 .

[0053] The brightness improvement gain calculation unit 134 receives the brightness improvement reference gain supplied from the brightness improvement reference gain calculation unit 131 and the cumulative value of the cumulative load increase amount supplied from the load increase amount measurement / accumulation unit 132 .

[0054] The brightness improvement gain calculation unit 134 performs brightness improvement gain calculation processing with reference to the brightness improvement reference gain and the cumulative value of the cumulative load increase amount, and supplies the brightness improvement gain obtained thereby to the addition unit 135 .

[0055] In the brightness improvement gain calculation process, as the brightness improvement gain, the brightness improvement reference gain is multiplied by a gain linked to the cumulative value of the cumulative load increase (hereinafter referred to as "cumulative load increase - linked gain"). Fig. 9 The details of the brightness enhancement gain calculation process are described.

[0056] The adding unit 135 adds the brightness enhancement gain from the brightness enhancement gain calculating unit 134 and the normal-time gain together, and supplies the brightness enhancement gain thus obtained to the multiplying unit 136 .

[0057] The normal time gain is a gain by which the input video signal is multiplied and is used to change the input video signal into a high brightness display signal. For example, as the normal time gain, a gain is set with which brightness enhancement can always be performed during the use of the display panel without causing degradation of the problematic element.

[0058] Here, the additional brightness enhancement gain is added to the normal gain to further enhance the brightness of the input video signal. The additional brightness enhancement gain is adaptively controlled according to the measurement results of the cumulative load increase amount, the surface temperature of the display panel, and the current load on the display panel.

[0059] The multiplication unit 136 multiplies the input video signal by the brightness enhancement gain from the addition unit 135 and supplies an output video signal obtained thereby to the panel drive unit 112 .

[0060] exist Figure 3 In the embodiment, the panel driving unit 112 may include a panel temperature measuring unit 151 and a panel current measuring unit 152 .

[0061] The panel temperature measuring unit 151 includes a temperature sensor or the like provided on the panel unit 113. The panel temperature measuring unit 151 measures the surface temperature of the display panel and supplies the measurement result to the load increase amount measuring / accumulating unit 132 of the signal processing unit 111. Figure 7 and Figure 8 Describes an example configuration of a temperature sensor.

[0062] The panel current measuring unit 152 includes a current sensor or the like provided on the panel unit 113 . The panel current measuring unit 152 measures the current applied to the display panel and supplies the measurement result to the load increase amount measuring / accumulating unit 132 of the signal processing unit 111 .

[0063] It should be noted that Figure 3 The configuration of the signal processing unit 111 shown in FIG. 1 is an example, and its bare minimum constituent unit may form a configuration that does not use the measurement results from the panel temperature measurement unit 151 and the panel current measurement unit 152. Even with such a configuration, the increase in the load on the display panel caused by the brightness enhancement can be accumulated, and the additional brightness enhancement gain can be controlled to prevent excessive element degradation. In addition, by using the configuration of the measurement results from the panel temperature measurement unit 151 and the panel current measurement unit 152, the accuracy can be further improved.

[0064] (Calculation of brightness enhancement reference gain)

[0065] How the brightness-boosting reference gain calculation unit 131 calculates the brightness-boosting reference gain is not limited to any specific example, and for example, the brightness-boosting reference gain calculation unit 131 may calculate a fixed gain or a gain that changes according to certain information.

[0066] However, due to the additional brightness enhancement gain, the current load increases to achieve brightness enhancement, so the impact of display panel burn-in is greater; therefore, it is hoped that in conjunction with the application of brightness enhancement technology Figure 1 The brightness enhancement processing shown in FIG. 1 performs processing for limiting the length of time for which the brightness enhancement processing is performed at the same location (area).

[0067] (Measurement / accumulation of load increase)

[0068] As described above, in the above problem, only the measurement result of the brightness boost time period causes the element degradation of the display panel because there is no limit to the cumulative brightness boost time that increases as the display panel is continuously used for a long time. Therefore, it is necessary to accumulate the increase in load caused by the brightness boost process and perform feedback control on the brightness boost gain to prevent the element from being degraded to a level greater than a certain level due to the process.

[0069] Figure 4 An example of how the load increase amount measurement / accumulation unit 132 measures the load increase amount is shown. Figure 4 In the embodiment, the load increase amount measuring / accumulating unit 132 includes a cumulative added value calculating unit 141 and an accumulation processing unit 142 .

[0070] The cumulative added value calculation unit 141 receives the input video signal and the brightness enhancement factor. The cumulative added value calculation unit 141 calculates an added value for the accumulation process based on the increase in load caused by the brightness enhancement process.

[0071] In the cumulative added value calculation process, the cumulative added value may be correlated with the element degradation amount or the cumulative added value may be correlated with the brightness increase time.

[0072] Figure 5 The horizontal axis in represents the load increase amount and the vertical axis represents the cumulative addition value, and the relationship between the load increase amount and the cumulative addition value in the case where the cumulative addition value is correlated with the element degradation amount is shown by the thick line L21. Figure 5 In FIG. 1 , the thick line L21 has a relationship that as the load increase amount increases, the cumulative addition value increases at a predetermined gradient, and the higher the load, the larger the addition value. That is, in this example, a larger addition value is calculated for a high load to establish an association with the element degradation amount.

[0073] Figure 6 The horizontal axis in indicates the load increase amount and the vertical axis indicates the cumulative added value, and the relationship between the load increase amount and the cumulative added value in the case where the cumulative added value is related to the brightness increase time is shown by the thick line L31. Figure 6 In FIG. 1 , the thick line L31 has a relationship that as the load increase amount increases, the cumulative addition value has a constant value, and the addition value is constant regardless of the load. That is, in this example, a constant addition value is calculated to measure the length of time for executing the brightness enhancement process.

[0074] The accumulation processing unit 142 adds the added values ​​of each image frame calculated by the cumulative added value calculation process to thereby calculate the cumulative value of the load increase amount (cumulative load increase amount). In addition, the accumulation processing unit 142 writes the cumulative value data to the non-volatile memory 133 such as an EEPROM or reads the cumulative value data from the non-volatile memory 133 to maintain the cumulative value when the display device 1 is powered off.

[0075] The accumulation processing unit 142 performs accumulation processing on each predetermined area on the screen of the display panel to calculate the accumulation value of each predetermined area of ​​interest, so that it is possible to determine how long the brightness enhancement processing is performed on the same position (area). Then, the brightness improvement gain calculation unit 134 can control the additional brightness improvement gain with reference to the accumulated load increase amount.

[0076] Note that as the area on the screen of the display panel, for example, an area obtained by dividing the area of ​​the entire screen into a plurality of areas having predetermined longitudinal and lateral sizes can be used. Specifically, for example, the area described later can be used. Figure 8 The area corresponding to the divided area A.

[0077] (Measurement of panel temperature)

[0078] The load increase amount measurement / accumulation unit 132 performs load prediction by signal processing without using information about degradation characteristics according to temperature changes. Therefore, by performing video load prediction through signal processing or measuring the actual surface temperature of the display panel by a temperature sensor or the like, and considering the information about the temperature thus obtained as an accumulated added value for each predetermined area on the screen of the display panel, the accuracy can be improved.

[0079] Only one temperature sensor may be installed on the panel unit 113 to obtain supplementary information for load prediction through signal processing, or a plurality of temperature sensors may be installed on the panel unit 113 for improving the accuracy of the supplementary information or directly measuring the temperature without performing load prediction through signal processing.

[0080] Figure 7 1 shows a configuration example including a single temperature sensor provided on the panel unit 113. Figure 7 In the embodiment, the temperature sensor 171 is installed at a position corresponding to a substantially central portion of the screen of the display panel and measures the surface temperature of the display panel. Note that the temperature sensor 171 may be installed at a position other than the position corresponding to a substantially central portion of the screen of the display panel.

[0081] Figure 8 A configuration example including a plurality of temperature sensors provided on the panel unit 113 is shown. Figure 8An example is shown in which the area of ​​the entire screen of the display panel is divided into 4×9 areas of the same longitudinal and lateral size, and the temperature sensor 171 is installed in each divided area. It should be noted that for ease of description, on the screen of the display panel, dotted lines indicating the boundaries between the divided areas are shown.

[0082] exist Figure 8 , in the upper left divided area A11 and the lower right divided area Aij on the screen of the display panel, numbers corresponding to the length direction and the width direction of the divided area A are described. In addition, numbers corresponding to the longitudinal direction and the lateral direction of the temperature sensor 171 are described in the upper left temperature sensor 171-11 and the lower right temperature sensor 171-ij.

[0083] However, in those representations, i represents a number in the longitudinal direction, and j represents a number in the transverse direction. In other words, although Figure 8 An example is shown in which the screen of the display panel is divided into 4×9 divided areas, but the screen of the display panel may be divided into i×j (i and j: integers greater than 1) divided areas A, and the number of divided areas A in which the temperature sensor 171 is installed may be selectively determined.

[0084] exist Figure 8 In the embodiment, the temperature sensor 171-11 measures the surface temperature of the divided area A11 of the entire screen of the display panel. In addition, the temperature sensor 171-ij other than the temperature sensor 171-11 also measures the surface temperature of the divided area Aij corresponding to the installation position, and its description is omitted to avoid duplication.

[0085] Figure 7 The temperature sensor 171 and Figure 8 The temperature sensors 171-11 to 171-ij correspond to Figure 3 In the case where the plurality of temperature sensors 171-11 to 171-ij are installed, the surface temperature of the display panel can be measured more accurately than in the case where a single temperature sensor 171 is installed.

[0086] (Measurement of current load)

[0087] In addition to load prediction by signal processing, the accuracy of measuring the load increase can be expected to be improved by measuring the current actually flowing through the display panel by a current sensor, etc. For example, the current sensor can be provided on the display panel itself or on a power supply board configured to generate a voltage for driving the display panel.

[0088] (Calculation of brightness enhancement gain)

[0089] The brightness enhancement gain calculation unit 134 may reduce the brightness enhancement gain when the brightness enhancement process is performed for a long period of time and the cumulative load increase amount is thereby high, thereby reducing the influence of element degradation caused by the brightness enhancement process during the use period of time.

[0090] That is, the brightness improvement gain calculation unit 134 performs control for reducing the brightness improvement gain when the cumulative value of the load increase exceeds a predetermined value in the case where the brightness enhancement process is performed for a period longer than a predetermined period. The brightness improvement gain calculation unit 134 sets a value obtained by multiplying the brightness improvement reference gain by the accumulated load increase linkage gain as a final brightness improvement gain.

[0091] Fig. 9 shows how the gain is set relative to the cumulative load increase. Fig. 9 , the horizontal axis represents the cumulative value, and the vertical axis represents the cumulative load increase linkage gain.

[0092] exist Fig. 9 , the gain based on the cumulative load increase is represented by a thick line L41 including a straight line downward to the right. The cumulative load increase linkage gain is maintained at 100% before the cumulative value reaches a predetermined value, and gradually decreases at a predetermined gradient after the cumulative value exceeds the predetermined value. The cumulative load increase linkage gain is maintained at 0% after reaching 0%.

[0093] For example, the brightness improvement gain calculation unit 134 may control the brightness improvement gain of the entire screen using the cumulative load increase linkage gain according to the maximum value of the cumulative value of each predetermined area on the screen of the display panel. In addition, the brightness improvement gain calculation unit 134 may control the brightness improvement gain of each predetermined area on the screen of the display panel according to the cumulative value of each predetermined area of ​​interest using the cumulative load increase linkage gain.

[0094] Note that in this case as well, the area on the screen of the display panel may be, for example, an area obtained by dividing the area of ​​the entire screen into a plurality of areas having predetermined longitudinal and lateral sizes. Specifically, for example, the same area as described above may be used. Figure 8 The area corresponding to the divided area A.

[0095] (Adaptive Gain Control)

[0096] Fig.10 is a flowchart showing the flow of the brightness boost gain control process performed by the signal processing unit 111 .

[0097] In step S11 , the brightness improvement gain calculation unit 134 acquires the cumulative load increase amount from the load increase amount measurement / accumulation unit 132 .

[0098] The cumulative load increase is a cumulative value of the load increase obtained by measuring and accumulating the increase in load on the display panel caused by brightness enhancement. The cumulative load increase may take into account supplementary information such as the measurement result of the surface temperature of the display panel or the measurement result of the current flowing through the display panel.

[0099] In step S12 , the brightness improvement gain calculation unit 134 refers to the acquired cumulative load increase amount and adaptively controls the brightness improvement gain according to the degree of influence of degradation in the elements of the display panel.

[0100] For example, the brightness improvement gain calculation unit 134 performs control to reduce the brightness improvement gain when the brightness enhancement process has been performed for a long time and therefore the cumulative load increase amount is high, and sets a value obtained by multiplying the brightness improvement reference gain by the cumulative load increase amount interlocking gain as the final brightness improvement gain.

[0101] As described above, when changing the video signal from a low brightness display signal to a high brightness display signal by brightness enhancement, the signal processing unit 111 adaptively controls the brightness enhancement gain according to the degree of influence of element degradation by referring to the cumulative load increase amount obtained by measuring and accumulating the increase amount of load on the display panel.

[0102] This can solve problems in the long-term reliability of the display panel, such as burn-in caused by degradation of problematic elements that occurs when the brightness of the display panel is increased, and can thereby reduce the impact of degradation of elements of the display panel. In the case of an OLED display panel, the elements of the display panel are, for example, OLED elements of pixels arranged in two dimensions.

[0103] <2. Modifications>

[0104] In the above description, the signal processing unit 111 is a component of the display device 1 , but the signal processing unit 111 may be regarded as a single device, ie, a signal processing device.

[0105] In the case exemplified above, the display device 1 is a television receiver, but the display device 1 is not limited thereto and may be a device such as a display device. Examples of the display device include a medical monitor, a broadcast monitor, and a digital signage display.

[0106] In addition, the display device 1 can be used as a display unit of a PC (personal computer), a tablet device, a smart phone, a cellular phone, a game console, a head-mounted display, an in-vehicle device (such as a car navigation system or a rear seat monitor), or a wearable device (such as a watch or an eyeglass device).

[0107] In the above description, the OLED display device including the OLED display panel has been exemplified as the display device 1 , but the present technology is also applicable to display devices such as other self-luminous display devices including a self-luminous display panel.

[0108] In the above case, each of the pixels two-dimensionally arranged on the panel unit 113 (display panel) includes four sub-pixels of white (W), red (R), green (G) and blue (B), but the colors of the sub-pixels are not limited to these. For example, in each pixel, instead of the white (W) sub-pixel, a sub-pixel of another color having a brightness factor as high as that of white (W) can be used.

[0109] Note that, here, "OLED" can be replaced with "organic EL (electroluminescence)". For example, it can be said that an OLED display device is an organic EL display device. In addition, "video" can be replaced with "image" because a video includes a plurality of image frames.

[0110] It should be noted that the embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present technology.

[0111] Furthermore, the effects described herein are merely exemplary and not restrictive, and other effects may be provided.

[0112] It should be noted that the present technology can adopt the following configurations.

[0113] (1) A signal processing device comprising:

[0114] A signal processing unit, wherein the signal processing unit is configured to:

[0115] When the video signal is changed from a low brightness display signal to a high brightness display signal by brightness enhancement, obtaining a cumulative load increase amount obtained by measuring and accumulating an increase amount of a load on the display panel caused by brightness enhancement, and

[0116] Referring to the acquired cumulative load increase amount, a first gain for increasing the brightness of the video signal is adaptively controlled according to the degree of influence of degradation of the element of the display panel.

[0117] (2) The signal processing device according to Item (1), wherein the signal processing unit acquires the cumulative load increase amount in which information on a surface temperature of the display panel is taken into consideration.

[0118] (3) The signal processing device according to Item (1) or (2), wherein the signal processing unit acquires the cumulative load increase amount in which information on the current flowing through the display panel is taken into consideration.

[0119] (4) The signal processing device according to any one of items (1) to (3), wherein the signal processing unit further adds the first gain to a second gain for brightness enhancement, thereby enhancing the brightness of the video signal.

[0120] (5) The signal processing device according to Item (4), wherein the signal processing unit uses, as the first gain, a value based on a third gain linked to the cumulative load increase amount.

[0121] (6) The signal processing device according to item (5), wherein the signal processing unit uses, as the first gain, a value obtained by multiplying the third gain by a fourth gain, the fourth gain being used as a reference for brightness improvement.

[0122] (7) The signal processing device according to any one of items (1) to (6), wherein the signal processing unit is configured as follows:

[0123] An added value for accumulation is calculated according to the load increased due to the brightness enhancement, and

[0124] The added values ​​calculated for each image frame are added together to calculate a cumulative value of the load increase amount.

[0125] (8) The signal processing device according to Item (7), wherein the signal processing unit calculates a larger added value for a higher load so as to correlate with the element degradation amount.

[0126] (9) The signal processing device according to item (7), wherein the signal processing unit calculates a constant added value to measure a length of time during which brightness enhancement has been performed.

[0127] (10) The signal processing device according to any one of items (7) to (9), further including: a memory configured to store data about the accumulated value.

[0128] (11) The signal processing device according to any one of items (7) to (10), wherein the signal processing unit calculates a cumulative value of a load increase amount for each of predetermined areas on the screen of the display panel.

[0129] (12) A signal processing device according to any one of items (1) to (11), wherein the signal processing unit performs control for reducing the first gain when the cumulative value of the load increase exceeds a predetermined value when brightness enhancement has been performed for a period longer than a predetermined period.

[0130] (13) The signal processing device according to item (12), wherein the signal processing unit controls the first gain of the entire screen according to a maximum value of cumulative values ​​of each of predetermined areas on the screen of the display panel.

[0131] (14) The signal processing device according to item (12), wherein the signal processing unit controls the first gain of each predetermined area on the screen of the display panel according to a cumulative value of each predetermined area.

[0132] (15) The signal processing device according to item (2), wherein the display panel is provided with one or more temperature sensors configured to measure a surface temperature.

[0133] (16) A signal processing method, comprising:

[0134] When the video signal is changed from a low-brightness display signal to a high-brightness display signal by brightness enhancement through the signal processing device, a cumulative load increase amount obtained by measuring and accumulating an increase amount of the load on the display panel caused by brightness enhancement is obtained; and

[0135] The signal processing device refers to the acquired cumulative load increase amount and adaptively controls the first gain for increasing the brightness of the video signal according to the degree of influence of the degradation of the element of the display panel.

[0136] (17) A display device comprising:

[0137] a signal processing unit configured to process a video signal; and

[0138] A panel unit includes a display panel configured to display a video based on a video signal, wherein

[0139] The signal processing unit is configured to:

[0140] When the video signal is changed from a low brightness display signal to a high brightness display signal by brightness enhancement, obtaining a cumulative load increase amount obtained by measuring and accumulating an increase amount of load on the display panel caused by brightness enhancement, and

[0141] Referring to the acquired cumulative load increase amount, a first gain for increasing the brightness of the video signal is adaptively controlled according to the degree of influence of degradation of the element of the display panel.

[0142] (18) The display device according to item (17), wherein the panel unit includes an OLED display panel.

[0143] Reference Numbers List

[0144] 1 display device 110 signal input unit 111 signal processing unit

[0145] 112 panel driving unit 113 panel unit 131 brightness enhancement reference gain calculation unit 132 load increase amount measurement / accumulation unit 133 non-volatile memory

[0146] 134 brightness enhancement gain calculation unit 135 addition unit 136 multiplication unit

[0147] 141 Cumulative added value calculation unit 142 Cumulative processing unit 151 Panel temperature measurement unit 152 Panel current measurement unit 171 Temperature sensor.

Claims

1. A display device, comprising: a signal processing circuit configured to process a video signal; as well as A display panel is configured to display a video based on the video signal. Wherein, the signal processing circuit is configured as: Obtaining a cumulative load increase amount according to a load increase amount of the display panel caused by brightness enhancement, controlling the brightness of the video signal with reference to the acquired cumulative load increase amount, and The length of time that the brightness enhancement is performed is limited.

2. The display device according to claim 1, wherein: The signal processing circuit is configured to acquire the cumulative load increase amount based on a surface temperature of the display panel.

3. The display device according to claim 1, wherein: The signal processing circuit is configured to acquire the cumulative load increase amount based on a current flowing through the display panel.

4. A display device according to any one of the preceding claims, wherein: The display panel is a self-luminous display panel.

5. A display device according to any one of the preceding claims, wherein: The signal processing circuit is further configured to: enhancing the brightness of the video signal by adding a first gain for increasing the brightness of the video signal to a second gain for brightness enhancement, and A value based on a third gain linked to the cumulative load increase amount is used as the first gain.

6. The display device according to claim 5, wherein: The signal processing circuit is configured to use, as the first gain, a value obtained by multiplying the third gain by a fourth gain serving as a reference for brightness improvement.

7. The display device according to claim 1, wherein: The signal processing circuit is configured as follows: An added value for accumulation is calculated according to the load increased due to the brightness enhancement, and The added values ​​calculated for each image frame are added together to calculate a cumulative value of the load increase amount.

8. The display device according to claim 7, wherein: The signal processing circuit is configured to calculate a larger added value for a higher load to correlate with the amount of element degradation.

9. The display device according to claim 7, wherein: The signal processing circuit is configured to calculate a constant added value to measure a length of time for which brightness enhancement has been performed. 10 . The display device according to claim 7 , further comprising a memory configured to store data regarding the accumulated value.

11. The display device according to claim 7, wherein: The signal processing circuit is configured to calculate the cumulative value of the load increase amount for each of predetermined areas on a screen of the display panel.

12. The display device according to claim 5, wherein: The signal processing circuit is configured to perform control for reducing the first gain when a cumulative value of a load increase amount exceeds a predetermined value in a case where brightness enhancement is performed for a period longer than a predetermined period.

13. The display device according to claim 5, wherein: The signal processing circuit is configured to control the first gain for the entire screen according to a maximum value of cumulative values ​​of each predetermined area on the screen of the display panel.

14. The display device according to claim 5, wherein: The signal processing circuit is configured to control the first gain for each predetermined area on a screen of the display panel according to a cumulative value of each predetermined area.

15. The display device according to claim 2, wherein: The display panel is provided with one or more temperature sensors configured to measure the surface temperature.

16. A display device according to any one of the preceding claims, wherein: The display panel is an OLED display panel.

17. A display device according to any one of the preceding claims, wherein: The display panel includes display pixels each including white, red, green, and blue sub-pixels.

18. The display device according to claim 6, wherein: The display panel includes display pixels each including red, green and blue sub-pixels.

19. The display device according to any one of the preceding claims, further comprising an input interface configured to receive broadcast content, communication content or recorded content.

20. A display device according to any one of the preceding claims, wherein: The display device is a television.

Images