Display control apparatus and method, and program

Abstract

The present technology relates to a display control device and method, and a program capable of reducing light leakage without compromising the overall brightness. A display control apparatus detects a halo risk area, which is an area having a high risk of causing halo, based on an illuminance level, which is a brightness level at which a lamp of an adjacent block adjacent to each block constituting a backlight is turned on, and an illuminance level difference, which is a difference between the illuminance levels of each block and the adjacent block, and adjusts the illuminance level for each block based on the halo risk area. The present technology can be applied to a display device including a liquid crystal display panel using a small LED backlight.

Description

TECHNICAL FIELD

[0001] The present technology relates to a display control apparatus and method and a program, and particularly to a display control apparatus and method and a program capable of reducing light leakage without impairing overall luminance. BACKGROUND

[0002] In recent years, the use of mini LED backlights employing small light emitting diodes (LEDs) of about 100 μm to 200 μm in diameter is increasing.

[0003] According to the mini LED backlight, compared with a conventional direct type LED, fine local dimming control can be achieved with more and smaller segments. However, since the distance between the liquid crystal panel and the backlight is short, the diffusion of light is limited, and the light leakage phenomenon (flare) perceived even when the liquid crystal is off appears in blocks, and the flare appearance deteriorates compared with the case of employing a conventional size LED.

[0004] For example, Patent Literature 1 proposes a technique of performing control to reduce luminance so that a flare generated from a backlight is not visible by simulating the flare.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: JP 2011-511306 A SUMMARY OF THE INVENTION

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, Patent Literature 1 only describes a general way of reducing the luminance of the backlight as a whole. Therefore, with the technique described in Patent Literature 1, the luminance of the backlight is reduced as a whole, and the picture becomes dark.

[0010] The present technology is made in view of this situation, and aims at being able to reduce light leakage without impairing overall luminance.

[0011] TECHNICAL SOLUTION TO THE PROBLEM

[0012] A display control apparatus according to one aspect of the present technology includes a flare risk area detection unit configured to detect a flare risk area based on a lighting level and a lighting level difference, the flare risk area being an area in which a risk of causing a flare is high, the lighting level being a luminance level at which a lamp of an adjacent block adjacent to each block constituting a backlight is lit, and the lighting level difference being a difference in lighting level between each block and the adjacent block; and a lighting level adjustment unit configured to adjust the lighting level for each block based on the flare risk area.

[0013] According to one aspect of the present technology, based on the brightness level, i.e., the illuminance level, of the lamps of adjacent blocks that constitute the backlight being lit and the difference between the illuminance levels of each block and the adjacent blocks, i.e., the illuminance level difference, a region with a high risk of causing halo is detected as a halo risk zone, and the illuminance level is adjusted for each block based on the halo risk zone. Attached Figure Description

[0014] Figure 1 This is a block diagram illustrating a configuration example of a display device according to an embodiment of the present technology.

[0015] Figure 2 It is shown Figure 1 The configuration example of the video display processing unit, along with the block diagram of the display unit.

[0016] Figure 3 This diagram illustrates the detection and processing of halo risk areas.

[0017] Figure 4 This is a diagram illustrating a specific example of halo risk zone detection and processing when a halo risk is determined to be high.

[0018] Figure 5 This is a diagram illustrating a specific example of halo risk zone detection and processing when the halo risk is determined to be low.

[0019] Figure 6 This refers to the diagram showing the determination and processing of bright light areas.

[0020] Figure 7 This diagram illustrates a specific example of the lighting area determination process when the size of the lighting area is large.

[0021] Figure 8 This diagram illustrates a specific example of the lighting zone determination process when the size of the lighting zone is small.

[0022] Figure 9 This is a flowchart illustrating an example of backlight control processing.

[0023] Figure 10 This is a flowchart illustrating another example of backlight control processing.

[0024] Figure 11 This is a diagram illustrating an example of the effect of this technique.

[0025] Figure 12 This is a block diagram illustrating an example of computer configuration. Detailed Implementation

[0026] The following describes embodiments for implementing this technology. The description will proceed in the following order.

[0027] 1. Configuration

[0028] 2. Details of each process

[0029] 3. Work

[0030] 4. Other

[0031] 1. Configuration

[0032] Equipment Configuration

[0033] Figure 1 This is a block diagram illustrating a configuration example of a display device according to an embodiment of the present technology.

[0034] Figure 1 The display device 1 includes a tuner 11, an HDMI (registered trademark) receiver 12, a video distribution application 13, a selector 14, a video display processing unit 15, and a display unit 16.

[0035] Tuner 11 acquires the desired video signal (stream) from the broadcast wave received using an antenna (not shown) and outputs the video signal to selector 14.

[0036] HDMI receiver 12 is an interface for receiving video signals from external devices (not shown), such as personal computers or gaming devices. HDMI receiver 12 outputs the received video signals to selector 14.

[0037] The video distribution application 13 receives the desired video signal from the video distribution server via the network and outputs the received video signal to the selector 14.

[0038] Selector 14 selects one of the video signals provided by tuner 11, HDMI receiver 12, and video distribution application 13, and outputs the selected video signal to video display processing unit 15.

[0039] The video display processing unit 15 performs processing on the video signal, such as frame rate conversion, and controls the display unit 16 based on the processing results.

[0040] The display unit 16 includes a liquid crystal display panel 21 and a backlight 22.

[0041] The liquid crystal display panel 21 drives the liquid crystal display elements to modulate the light emitted from the backlight 22 for display.

[0042] The backlight 22 is constructed using, for example, small light-emitting diodes (LEDs) of about 100μm to 200μm, conventional-sized LEDs, or cold cathode fluorescent lamps (CCFLs), and emits surface-emitting light onto the liquid crystal display panel 21.

[0043] Note that, although Figure 1The example shows a configuration of a display device including a display unit, but this technology can also be applied to display control devices that do not include a display unit as a component.

[0044] Configuration of video display processing unit

[0045] Figure 2 It is shown Figure 1 The configuration example of the video display processing unit, along with the block diagram of the display unit.

[0046] Figure 2 The video display processing unit 15 is configured to include a display control unit 31 and a backlight control unit 32.

[0047] The video signal from selector 14 is provided to display control unit 31 and backlight control unit 32.

[0048] The display control unit 31 controls the display of the liquid crystal display panel 21 based on the provided video signal. Specifically, the display control unit 31 performs predetermined image processing on the video signal, such as gamma processing and overdrive processing, and outputs the liquid crystal display control signal to the liquid crystal display panel 21.

[0049] The backlight control unit 32 controls the backlight 22 to emit light based on the provided video signal. Specifically, the backlight control unit 32 generates a backlight control signal based on the provided video signal and outputs the generated backlight control signal to the backlight 22.

[0050] The backlight control unit 32 includes an illuminance level calculation unit 51, a halo risk zone detection unit 52, a lighting area size determination unit 53, an illuminance level reduction zone setting unit 54, and an illuminance level adjustment unit 55. Note that the backlight 22 is divided into multiple blocks, each block including one or more lights, and the processing in the backlight control unit 32 is performed, for example, from the upper left of the screen on a block-by-block basis.

[0051] The illuminance level calculation unit 51 calculates the illuminance level of each lamp constituting the backlight 22 based on the provided video signal, and outputs the calculated illuminance level to the halo risk area detection unit 52, the lighting area size determination unit 53, and the illuminance level adjustment unit 55. Furthermore, the illuminance level represents the brightness level at which the lamp is illuminated.

[0052] The halo risk zone detection unit 52 uses the illuminance level provided by the illuminance level calculation unit 51 to detect halo risk zones, which are regions with high halo risk levels indicating the risk level that causes halo. Specifically, the halo risk zone detection unit 52 detects halo risk zones based on the illuminance level of adjacent blocks in the backlight 22 that are adjacent to the block to be processed (i.e., the processing target block), and the illuminance level difference between the processing target block and the adjacent blocks. The halo risk zone detection unit 52 outputs the detected information indicating halo risk zones to the illuminance level reduction zone setting unit 54.

[0053] The illumination area size determination unit 53 uses the illuminance level provided by the illuminance level calculation unit 51 to determine the size of the area, i.e., the illumination area, which includes one or more illuminated blocks. Specifically, when the processing target block in the backlight 22 is included in the illumination area (i.e., the lamp of the processing target block is lit), the illumination area size determination unit 53 determines the size of the illumination area including the processing target block based on the illuminance level of the surrounding blocks of the processing target block. The illumination area size determination unit 53 outputs illumination area information regarding the size of the illumination area including the processing target block to the illuminance level reduction area setting unit 54.

[0054] The illuminance level reduction zone setting unit 54 sets the area where the illuminance level is reduced, i.e., the illuminance level reduction zone, based on the information representing the halo risk zone provided by the halo risk zone detection unit 52 and the information of the lighting zone provided by the lighting zone size determination unit 53.

[0055] For example, when the target block is a halo risk area and the size of the illuminated area is above a threshold, the illuminance level reduction zone setting unit 54 sets the target block as a reduction zone. In this case, the subsequent illuminance level adjustment unit 55 adjusts the illuminance level of the lamps in the target block. Even if the target block is a halo risk area, if the size of the illuminated area is less than the threshold, the illuminance level reduction zone setting unit 54 will also set the target block as not a reduction zone. In this case, the subsequent illuminance level adjustment unit 55 does not adjust the illuminance level of the lamps in the target block. Note that the illuminance level reduction zone can be set based on information indicating a halo risk area or information indicating an illuminated area.

[0056] The illuminance level reduction zone setting unit 54 outputs the reduction zone information, which indicates the set illuminance level reduction zone, to the illuminance level adjustment unit 55.

[0057] The illuminance level adjustment unit 55 adjusts the illuminance level based on the backlight illuminance level provided by the illuminance level calculation unit 51 and the reduction zone information provided by the illuminance level reduction zone setting unit 54, so as to reduce the illuminance level of the blocks contained in the backlight reduction zone. The illuminance level adjustment unit 55 generates a backlight control signal based on the adjusted illuminance level and outputs the generated backlight control signal to the backlight 22 to control the backlight 22.

[0058] 2. Details of each process

[0059] Halo Risk Zone Detection and Processing

[0060] Figure 3 This diagram illustrates the detection and processing of halo risk areas.

[0061] exist Figure 3 In A, the adjacent blocks of the processed object block (x, y) are shaded. First, as... Figure 3 As shown in A, when the sum of the illuminance levels of the top-left adjacent block (x-1, y-1), the top-right adjacent block (x, y-1), the top-right adjacent block (x+1, y-1), the left adjacent block (x-1, y), the right adjacent block (x+1, y), the bottom-left adjacent block (x-1, y+1), the bottom-right adjacent block (x, y+1), and the bottom-right adjacent block (x+1, y+1) of the processing object block (x, y) is below a specific threshold α1, the halo risk zone detection unit 52 determines that condition 1 is met.

[0062] Next, regarding the processing of object blocks (x, y), such as Figure 3 As shown in B, when the sum of the illuminance level differences between the processing object block (x, y) and each adjacent block is greater than a specific threshold α2, the halo risk zone detection unit 52 determines that condition 2 is met.

[0063] When conditions 1 and 2 above are met, the processing block (x, y) is determined to be a block with a high halo risk. Note that although the determination is reliable when both conditions are met, it can also be determined to be a block with a high halo risk when at least one of conditions 1 and 2 is met.

[0064] This judgment is performed on each block of the backlight 22 to detect halo risk areas.

[0065] Note that, for condition 1, the number of adjacent blocks with an illuminance level below a specific threshold β1 is above a specific threshold Th1, and for condition 2, the number of adjacent blocks with an illuminance level difference of more than a specific threshold β2 from the block being processed is above a threshold Th2, can also be determined as having a high risk of halo.

[0066] Figure 4 This is a diagram illustrating a specific example of halo risk zone detection and processing when a halo risk is determined to be high.

[0067] Figure 4 Some of the blocks that make up the backlight 22 are shown. Black (shade) blocks represent no light (e.g., illuminance level approximately 0), and white (no shadow) blocks represent light (e.g., illuminance level approximately 1).

[0068] For example, such as Figure 4As shown, the top-left adjacent block (x-1, y-1), the top-right adjacent block (x, y-1), the top-right adjacent block (x+1, y-1), the right-right adjacent block (x+1, y), and the bottom-right adjacent block (x+1, y+1) of the processing object block (x, y) are not lit. On the other hand, the left-right adjacent block (x-1, y), the bottom-left adjacent block (x-1, y+1), and the bottom-right adjacent block (x, y+1) are lit.

[0069] In this case, since there are many unlit adjacent blocks, the sum of the backlight illuminance levels of the adjacent blocks is less than a specific threshold α1, and the halo risk zone detection unit 52 determines that condition 1 is met.

[0070] In this case, since the processing target block is lit up and there are many unlit adjacent blocks, the halo risk area detection unit 52 determines that the sum of the backlight illuminance level differences between the processing target block and the adjacent blocks is greater than a specific threshold α2, and the halo risk area detection unit 52 determines that condition 2 is met.

[0071] Since both conditions 1 and 2 are met, the halo risk zone detection unit 52 determines that the block to be processed is a block with a high halo risk.

[0072] Figure 5 This is a diagram illustrating a specific example of halo risk zone detection and processing when the halo risk is determined to be low.

[0073] exist Figure 5 Zhongyu Figure 4 Some of the blocks that make up the backlight 22 are also shown.

[0074] For example, such as Figure 5 As shown, all adjacent blocks of the processing object block (x, y) are lit up.

[0075] In this case, since there are many lit adjacent blocks, the sum of the backlight illuminance levels of the adjacent blocks is greater than a specific threshold α1, and the halo risk zone detection unit 52 determines that condition 1 is not met.

[0076] In this case, since the processing target block is lit up and all adjacent blocks are lit up, the halo risk area detection unit 52 determines that the sum of the backlight illuminance level differences between the processing target block and the adjacent blocks is less than a specific threshold α2, and the halo risk area detection unit 52 determines that condition 2 is not met.

[0077] Since neither condition 1 nor condition 2 is met, the halo risk zone detection unit 52 determines that the block to be processed is a block with low halo risk.

[0078] Lighting Zone Determination and Processing

[0079] Figure 6 This diagram illustrates the process of determining the lighting zone.

[0080] Figure 6 The example shown illustrates 24 blocks surrounding the processed object block (x, y) that are designated as peripheral blocks. Figure 6 In the middle, the surrounding blocks are shaded. Note that the range of the surrounding blocks is not limited to... Figure 6 Examples.

[0081] That is, the surrounding blocks of the object block (x, y) include the surrounding block (x-2, y-2), the surrounding block (x-1, y-2), the surrounding block (x, y-2), the surrounding block (x+1, y-2), the surrounding block (x+2, y-2), the surrounding block (x-2, y-1), the surrounding block (x-1, y-1), the surrounding block (x, y-1), the surrounding block (x+1, y-1), the surrounding block (x+2, y-1), the surrounding block (x-2, y), the surrounding block (x-1, y), the surrounding block (x+1, y), the surrounding block (x+2, y), the surrounding block (x-2, y+1), the surrounding block (x-1, y+1), the surrounding block (x, y+1), the surrounding block (x+1, y+1), the surrounding block (x-2, y+1), the surrounding block (x-2, y+1), the surrounding block (x-2, y- ... y+2), surrounding block (x-1, y+2), surrounding block (x, y+2), surrounding block (x+1, y+2) and surrounding block (x+2, y+2).

[0082] When the processing target block (x, y) in the backlight 22 is a lit block, the illumination area size determination unit 53 determines whether each peripheral block is a lit block based on the illuminance level of each peripheral block, thereby determining whether the size of the illumination area, including the processing target block, is greater than or less than a predetermined threshold. The determination result is output as illumination area information to the illuminance level reduction area setting unit 54.

[0083] That is, if the size of the illuminated area is smaller than a predetermined threshold, it means that the sum of the illuminance levels of the surrounding blocks is smaller. In this case, since the insufficient brightness caused by the brightness reduction due to the halo countermeasures becomes very significant (i.e., there is a concern about the brightness reduction), the illuminance level reduction area setting unit 54 performs processing to suppress the brightness reduction based on the illuminated area information.

[0084] Figure 7 This diagram illustrates a specific example of the lighting area determination process when the size of the lighting area is large.

[0085] Figure 7 Zhongyu Figure 4 Similarly, some of the blocks that make up the backlight 22 are shown. Black (shaded) blocks represent lights that are not lit, and white blocks (no shadow) represent lights that are lit. That is, the processing object block (x, y) is the lit block.

[0086] For example, in Figure 7In the case of (x-2, y-2), (x-1, y-2), (x, y-2), (x+1, y-2), and (x+2, y-2), the surrounding blocks are determined to be unlit blocks. On the other hand, the surrounding blocks (x-2, y-1), (x-1, y-1), (x, y-1), (x+1, y-1), (x+2, y-1), (x-2, y), (x-1, y), (x+1, y), (x+2, y), (x-2, y), (x-2, y+1), (x-1, y+1), (x, y+1), (x+1, y+1), (x+2, y+1), (x-2, y+2), (x-1, y+2), (x-1, y+2), (x, y+2), (x+1, y+2), and (x+2, y+2) are determined to be lit blocks.

[0087] That is, in this case, the lit area is the region that includes the processing object block (x, y), the surrounding block (x-2, y-1), the surrounding block (x-1, y-1), the surrounding block (x, y-1), the surrounding block (x+1, y-1), the surrounding block (x+2, y-1), the surrounding block (x-2, y), the surrounding block (x-1, y), the surrounding block (x+1, y), the surrounding block (x+2, y), the surrounding block (x-2, y+1), the surrounding block (x-1, y+1), the surrounding block (x, y+1), the surrounding block (x+1, y+1), the surrounding block (x+2, y+1), the surrounding block (x-2, y+2), the surrounding block (x-1, y+2), the surrounding block (x, y+2), the surrounding block (x+1, y+2), and the surrounding block (x+2, y+2).

[0088] For example, suppose the predetermined threshold for determining the size of the illuminated area is the size of 4 blocks. In this case, the illuminated area size determination unit 53 determines that the size of the illuminated area, including the processing object block (x, y), is above the predetermined threshold (e.g., the size of 4 blocks), and outputs the determination result of the illuminated area size as illuminated area information to the illuminance level reduction zone setting unit 54.

[0089] That is, in Figure 7 In this case, since the illuminated area, including the processing object block (x, y), is large, the illuminance level reduction setting unit 54 adjusts the brightness based on the illuminated area information.

[0090] Figure 8 This diagram illustrates a specific example of the lighting zone determination process when the size of the lighting zone is small.

[0091] Figure 8 Zhongyu Figure 7 Similarly, some of the blocks that make up the backlight 22 are shown. Black blocks represent lights that are not lit, and white blocks represent lights that are lit. That is, the processing object block (x, y) is the lit block.

[0092] For example, in Figure 8 In the case of (x-2, y-2), (x-1, y-2), (x, y-2), (x+1, y-2), (x+2, y-2), (x-2, y-1), (x-1, y-1), (x, y-1), (x+1, y-1), (x+2, y-1), (x-2, y), (x-1, y), (x+1, y), (x+2, y), (x-2, y+1), and (x-1, y+1) are determined to be unlit blocks. On the other hand, the peripheral block (x, y+1) is determined to be lit.

[0093] For example, such as Figure 7 As in the case where the predetermined threshold for determining the size of the illuminated area is 4 blocks, the illuminated area size determination unit 53 determines that the size of the illuminated area, including the processing object block (x, y), is less than the predetermined threshold (e.g., 4 blocks), and outputs the determination result of the illuminated area size as illuminated area information to the illuminance level reduction zone setting unit 54.

[0094] That is, in Figure 8 In this case, since the illuminated area, including the processing object block (x, y), is small, the illuminance level reduction zone setting unit 54 does not adjust the brightness based on the illuminated area information.

[0095] 3. Work

[0096] Figure 9 This is a flowchart illustrating an example of the backlight control processing of the backlight control unit 32.

[0097] In step S11, the illuminance level calculation unit 51 acquires the video signal provided by the selector 14.

[0098] In step S12, the illuminance level calculation unit 51 calculates the illuminance level of each lamp constituting the backlight 22 based on the acquired video signal, and outputs the calculated illuminance level to the halo risk zone detection unit 52, the lighting area size determination unit 53, and the illuminance level adjustment unit 55.

[0099] In step S13, as described above... Figure 3 and Figure 4The halo risk zone detection unit 52 uses the illuminance level provided by the illuminance level calculation unit 51 to detect areas including blocks with high halo risk, i.e., halo risk zones. The halo risk zone detection unit 52 outputs information indicating the detected halo risk zones to the illuminance level reduction zone setting unit 54.

[0100] In step S14, as described above... Figures 6 to 8 The illumination area size determination unit 53 uses the backlight illuminance level provided by the illuminance level calculation unit 51 to determine the size of the illumination area, including the object block, when the object block being processed is an illuminated block. The illumination area size determination unit 53 outputs illumination area information about the illumination area to the illuminance level reduction area setting unit 54.

[0101] In step S15, the illuminance level reduction zone setting unit 54 sets the area where the illuminance level is reduced, i.e., the illuminance level reduction zone, based on the information representing the halo risk zone provided by the halo risk zone detection unit 52 and the information of the bright area provided by the bright area size determination unit 53, as described above. Figure 2 The illuminance level reduction zone setting unit 54 outputs the reduction zone information, representing the set illuminance level reduction zone, to the illuminance level adjustment unit 55.

[0102] In step S16, the illuminance level adjustment unit 55 adjusts the illuminance level based on the illuminance level provided by the illuminance level calculation unit 51 and the reduction zone information provided by the illuminance level reduction zone setting unit 54, so as to reduce the illuminance level of the blocks contained in the illuminance level reduction zone.

[0103] In step S17, the illuminance level adjustment unit 55 generates a backlight control signal based on the adjusted illuminance level and outputs the generated backlight control signal to the backlight 22 to control the backlight 22.

[0104] Figure 10 This is a flowchart illustrating another example of the backlight control processing of the backlight control unit 32.

[0105] Notice, Figure 10 The difference between steps S31 to S36 is that the order of step S33, which corresponds to the lighting area determination process in step S14, and step S34, which corresponds to the halo risk area detection process in step S13, is reversed. However, otherwise, the process is performed in accordance with... Figure 1 Steps S11, S12, S14, S13, S15, and S16 are the same.

[0106] That is, the bright area determination process or the halo risk area detection process can be performed first. In addition, although not shown in the figure, the bright area determination process and the halo risk area detection process can also be performed in parallel.

[0107] 4. Other

[0108] The effect of this technology

[0109] Figure 11 This is a diagram illustrating an example of the effect of this technique.

[0110] Figure 11 Figure A is a diagram illustrating an example of an image displayed using existing technology. Figure 11 Figure B is an example of an image showing a block with a high halo risk level detected using this technique, clearly displayed. Figure 11 Figure C is a diagram illustrating an example of an image displayed using this technique.

[0111] In the past, such as Figure 11 As indicated by arrow P in A, a blocky appearance is produced in the halo generated in the dark area located at the boundary with the bright part of the image displayed on the liquid crystal panel using existing technology.

[0112] In this technology, such as Figure 11 In section B, a dotted pattern with shaded blocks is used to detect halo risk areas, and the illuminance level is reduced only in areas with high halo risk.

[0113] Therefore, as Figure 11 As shown in C, Figure 11 The blocky appearance produced in the halo indicated by arrow P of A is less noticeable.

[0114] As described above, in this technology, based on the brightness level (illuminance level) of the lamps of adjacent blocks that constitute the backlight and the difference in illuminance levels between each block and its adjacent blocks (illuminance level difference), areas with a high risk of causing halo are detected as halo risk zones, and the illuminance level of the backlight is adjusted based on the halo risk zones.

[0115] This allows for reduced light leakage without compromising overall brightness.

[0116] In this technology, when each block is included in the illuminated area of ​​the block that is illuminated, the size of the illuminated area is determined, and the illuminance level is adjusted for each block based on the size of the halo risk area and the illuminated area.

[0117] Therefore, the brightness of smaller parts of the illuminated area will not decrease, thus preventing a noticeable drop in brightness.

[0118] Computer configuration example

[0119] The above series of processes can be performed by hardware or software. In the case where the series of processing steps are performed by software, the program constituting the software is installed from a program recording medium into a computer or general-purpose personal computer embedded in dedicated hardware.

[0120] Figure 12This is a block diagram illustrating an example of a computer hardware configuration that performs the above series of processes through a program.

[0121] CPU 301, ROM 302 and RAM 303 are interconnected via bus 304.

[0122] Input / output interface 305 is also connected to bus 304. Input unit 306, including keyboard or mouse, and output unit 307, including display, speaker, etc., are connected to input / output interface 305. Storage unit 308, including hard disk or non-volatile memory, communication unit 309, including network interface, etc., and driver 310 for driving removable medium 311 are connected to input / output interface 305.

[0123] In a computer configured as described above, for example, CPU 301 loads a program stored in storage unit 308 into RAM 303 via input / output interface 305 and bus 304 and executes the program, thereby performing the series of processing steps described above.

[0124] The program executed by the CPU 301 may be recorded on the removable medium 311, or provided and installed in the storage unit 308 via wired or wireless transmission media such as a local area network, the Internet, or digital broadcasting.

[0125] Note that the program executed by the computer can be a program that is processed sequentially in the order described in this specification, or it can be a program that is processed in parallel or at necessary timed intervals, such as when it is called.

[0126] Note that in this specification, "system" refers to a collection of multiple components (devices, modules (parts), etc.), and it is irrelevant whether all components are housed in the same housing. Therefore, "system" can refer to both multiple devices housed in a separate housing and connected via a network, and multiple modules housed in a single housing for one device.

[0127] Furthermore, the effects described in this manual are illustrative only and are not limited thereto; other effects may also be provided.

[0128] The embodiments of this technology are not limited to the above embodiments, and various changes can be made without departing from the spirit of this technology.

[0129] For example, this technology can employ a cloud computing configuration, where multiple devices share and collaborate on a single function via a network.

[0130] Furthermore, the steps described in the flowchart above can be performed by one device or by multiple devices sharing the execution.

[0131] Furthermore, when a single step contains multiple processes, those processes can be executed by a single device or shared by multiple devices.

[0132] Configuration combination examples

[0133] This technology can also be configured as follows.

[0134] (1) A display control device, comprising:

[0135] A risk zone detection unit is configured to detect halo risk zones based on illuminance level and illuminance level difference. The halo risk zone is a region with a high risk of causing a halo. The illuminance level is the brightness level at which the lamps of adjacent blocks constituting the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and its adjacent blocks.

[0136] The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the halo risk zone.

[0137] (2) The display control device according to (1),

[0138] The risk zone detection unit is configured to detect a region comprising the following blocks as the halo risk zone: the sum of the illuminance levels of the adjacent blocks is below threshold α1 and the sum of the illuminance level differences between the block and the adjacent blocks is above threshold α2.

[0139] (3) The display control device according to (1),

[0140] The risk zone detection unit is configured to detect a region comprising the following blocks as the halo risk zone: the number of adjacent blocks with an illuminance level below threshold β1 is above threshold Th1, and the number of adjacent blocks with an illuminance level difference above threshold β2 is above threshold Th2.

[0141] (4) The display control device according to any one of (1) to (3) further includes a lighting area size determination unit, configured to determine the size of the lighting area when each block is included in the lighting area, wherein the lighting area is a region including blocks in which the lamps are lit.

[0142] The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the size of the illuminated area and the halo risk zone.

[0143] (5) The display control device according to (4),

[0144] The illuminance level adjustment unit is configured to adjust the illuminance level of the block when the block is the halo risk area and the size of the illuminated area is above a threshold.

[0145] (6) The display control device according to (4),

[0146] Even when the block is a halo risk area, if the size of the illuminated area is less than a threshold, the illuminance level adjustment unit is configured not to adjust the illuminance level of the block.

[0147] (7) The display control device according to any one of (1) to (6),

[0148] The illuminance level adjustment unit is configured to adjust based on the halo risk zone to reduce the illuminance level of each block.

[0149] (8) The display control device according to any one of (1) to (7) further includes a display unit, the display unit including the backlight.

[0150] (9) The display control device according to any one of (1) to (8),

[0151] Small light-emitting diodes (LEDs) are used for the backlight.

[0152] (10) A display control method, executed by a display control device, the display control method comprising:

[0153] A halo risk zone is detected based on illuminance level and illuminance level difference. The halo risk zone is an area with a high risk of causing a halo. The illuminance level is the brightness level at which the lamps of adjacent blocks constituting the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and its adjacent blocks.

[0154] Adjust the illuminance level for each area based on the halo risk zone.

[0155] (11) A program for causing a computer to act as:

[0156] A risk zone detection unit is configured to detect halo risk zones based on illuminance level and illuminance level difference. The halo risk zone is a region with a high risk of causing a halo. The illuminance level is the brightness level at which the lamps of adjacent blocks constituting the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and its adjacent blocks.

[0157] The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the halo risk zone.

[0158] Figure Labels

[0159] 1: Display device; 11: Tuner; 12: HDMI receiver; 13: Video distribution application; 14: Selector; 15: Video display processing unit; 16: Display unit; 21: LCD panel; 22: Backlight; 31: Display control unit; 32: Backlight control unit; 51: Illuminance level calculation unit; 52: Halo risk zone detection unit; 53: Bright area size determination unit; 54: Illuminance level reduction zone setting unit; 55: Illuminance level adjustment unit.

Claims

1. A display control device, comprising: The risk zone detection unit is configured to detect halo risk zones based on illuminance level and illuminance level difference. The halo risk zone is a region with a high risk of causing halo. The illuminance level is the brightness level at which the lamps of adjacent blocks that constitute the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and the adjacent blocks. as well as The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the halo risk zone.

2. The display control device according to claim 1, in, The risk zone detection unit is configured to detect an area comprising the following blocks as the halo risk zone: the sum of the illuminance levels of the adjacent blocks is below threshold α1 and the sum of the illuminance level differences between the block and the adjacent blocks is above threshold α2.

3. The display control device according to claim 1, in, The risk zone detection unit is configured to detect a region comprising the following blocks as the halo risk zone: the number of adjacent blocks with an illuminance level below threshold β1 is above threshold Th1, and the number of adjacent blocks with an illuminance level difference above threshold β2 is above threshold Th2.

4. The display control device according to claim 1 further includes a lighting area size determination unit, configured to determine the size of the lighting area when each block is included in the lighting area, wherein the lighting area is a region including blocks whose lamps are lit. in, The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the size of the illuminated area and the halo risk zone.

5. The display control device according to claim 4, in, The illuminance level adjustment unit is configured to adjust the illuminance level of the block when the block is the halo risk area and the size of the illuminated area is above a threshold.

6. The display control device according to claim 4, in, Even when the block is a halo risk area, if the size of the illuminated area is less than a threshold, the illuminance level adjustment unit is configured not to adjust the illuminance level of the block.

7. The display control device according to claim 1, in, The illuminance level adjustment unit is configured to adjust based on the halo risk zone to reduce the illuminance level of each block.

8. The display control device according to claim 1 further includes a display unit, the display unit including the backlight.

9. The display control device according to claim 1, in, Small light-emitting diodes (LEDs) are used for the backlight.

10. A display control method, executed by a display control device, the display control method comprising: The halo risk zone is detected based on illuminance level and illuminance level difference. The halo risk zone is an area with a high risk of causing halo. The illuminance level is the brightness level at which the lamps of adjacent blocks that constitute the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and the adjacent blocks. as well as Adjust the illuminance level for each area based on the halo risk zone.

11. A program for causing a computer to act as: A risk zone detection unit is configured to detect halo risk zones based on illuminance level and illuminance level difference. The halo risk zone is a region with a high risk of causing a halo. The illuminance level is the brightness level at which the lamps of adjacent blocks constituting the backlight are lit. The illuminance level difference is the difference in illuminance level between each block and its adjacent blocks. The illuminance level adjustment unit is configured to adjust the illuminance level for each block based on the halo risk zone.

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