WO2010067738A1 - 表示装置、輝度調整装置、輝度調整方法及びプログラム - Google Patents
表示装置、輝度調整装置、輝度調整方法及びプログラム Download PDFInfo
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- WO2010067738A1 WO2010067738A1 PCT/JP2009/070252 JP2009070252W WO2010067738A1 WO 2010067738 A1 WO2010067738 A1 WO 2010067738A1 JP 2009070252 W JP2009070252 W JP 2009070252W WO 2010067738 A1 WO2010067738 A1 WO 2010067738A1
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Definitions
- the present invention relates to a display device, a brightness adjusting device, a brightness adjusting method, and a program.
- liquid crystal display devices using liquid crystals Conventionally, liquid crystal display devices using liquid crystals, plasma display devices using plasma, and the like have been put to practical use as flat and thin display devices.
- the liquid crystal display device is a display device that displays an image by providing a backlight and changing the arrangement of liquid crystal molecules by applying a voltage so as to allow or block light from the backlight.
- the plasma display device enters a plasma state by applying a voltage to the gas sealed in the substrate, and the phosphor is irradiated with ultraviolet rays generated by energy generated when returning from the plasma state to the original state. This is a display device that displays visible light.
- the organic EL display device is a display device that displays an image using light emitted from the organic EL element.
- the self-luminous display device does not require a backlight because the element emits light by itself, and thus can be made thinner than a liquid crystal display device.
- the organic EL display device since the moving image characteristics, viewing angle characteristics, color reproducibility, and the like are superior to the liquid crystal display device, the organic EL display device has attracted attention as a next-generation flat thin display device.
- Patent Document 1 for example, in a self-luminous display panel such as an organic EL display, from the viewpoint of panel protection, the current flowing through the panel is suppressed to a maximum current or less, A technique for reducing peak luminance from information of a video signal is known.
- the current value is reduced below the maximum current and the peak luminance is reduced for the purpose of reducing power consumption. For this reason, it is possible to reduce power consumption, but the situation is such that the user can freely adjust the brightness in a dark image, reduce only the power consumption, or keep the brightness while reducing power to some extent. It is difficult to set according to the situation. In addition, it has been impossible to adjust power consumption and peak luminance according to the brightness of the room.
- the brightness of the backlight is lowered to reduce the power consumption, while the video signal is brightened.
- information such as the original texture, gloss, and contrast that the video signal has is lost.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an optimal video according to the situation by individually adjusting peak luminance and power consumption. It is an object of the present invention to provide a new and improved display device, brightness adjusting device, brightness adjusting method, and program capable of performing the above.
- a setting condition acquisition unit that acquires various conditions for adjusting a gain of a video signal, and various conditions acquired by the setting condition acquisition unit
- a table calculating unit that calculates a table representing the relationship between the average luminance and gain of the video signal and that can set the peak luminance and power consumption of the video signal independently; and is input for each frame.
- An average luminance calculating unit for calculating an average luminance of the video signal, a gain calculating unit for calculating a gain of the video signal from the table based on the average luminance calculated by the average luminance calculating unit, and the gain calculating unit.
- a video signal adjusting unit that adjusts the video signal using the calculated gain, and a plurality of pixels that emit light according to the video signal are arranged, and the video signal adjusted by the video signal adjusting unit is arranged. And a display panel for displaying an image based on the display device is provided.
- various conditions for adjusting the gain of the video signal are acquired, and a table representing the relationship between the average luminance of the video signal and the gain is calculated based on the acquired various conditions.
- This table is a table in which the peak luminance and power consumption of the video signal are set independently.
- the average luminance of the video signal input for each frame is calculated, and the gain of the video signal is calculated from the table based on the calculated average luminance.
- the video signal is adjusted using the gain calculated by the gain calculation unit, and the video is displayed based on the adjusted video signal on the display panel in which a plurality of pixels that emit light according to the video signal are arranged. .
- the peak brightness and power consumption can be controlled independently according to various conditions, so the power consumption is maintained while maintaining the original contrast, object or human skin gloss. Can be reduced.
- the setting condition acquisition unit includes: environment information representing a surrounding environment of the display device; user setting information set by a user; information on maximum power consumption allowed by the display panel; or metadata representing a video type.
- environment information representing a surrounding environment of the display device
- user setting information set by a user information on maximum power consumption allowed by the display panel
- metadata representing a video type information representing a video type.
- it may be provided with a memory that is provided in the previous stage of the video signal adjustment unit and temporarily holds the video signal of the frame to be multiplied by the gain.
- the chromaticity calculation unit that calculates the chromaticity of the video signal based on various conditions acquired by the setting condition acquisition unit, and the chromaticity of the video signal using the chromaticity calculated by the chromaticity calculation unit And a chromaticity adjustment unit that adjusts.
- a setting condition acquisition unit that acquires various conditions for adjusting a gain of a video signal, and various types of information acquired by the setting condition acquisition unit Based on the conditions, a table calculation unit that calculates a table that represents the relationship between the average luminance and gain of the video signal and that can set the peak luminance and power consumption of the video signal independently;
- An average luminance calculating unit that calculates an average luminance of an input video signal;
- a gain calculating unit that calculates a gain of the video signal from the table based on the average luminance calculated by the average luminance calculating unit; and the gain
- a luminance adjustment device including a video signal adjustment unit that adjusts a video signal using the gain calculated by the calculation unit.
- the setting condition acquisition unit includes: environment information representing a surrounding environment of the display device; user setting information set by a user; information on maximum power consumption allowed by the display panel; or metadata representing a video type.
- environment information representing a surrounding environment of the display device
- user setting information set by a user information on maximum power consumption allowed by the display panel
- metadata representing a video type information representing a video type.
- it may be provided with a memory that is provided in the previous stage of the video signal adjustment unit and temporarily holds the video signal of the frame to be multiplied by the gain.
- the chromaticity calculation unit that calculates the chromaticity of the video signal based on various conditions acquired by the setting condition acquisition unit, and the chromaticity of the video signal using the chromaticity calculated by the chromaticity calculation unit And a chromaticity adjustment unit that adjusts.
- the setting condition acquisition unit calculates a table representing the relationship between the average luminance and gain of the video signal, calculating the table in which the peak luminance and power consumption of the video signal can be set independently, and the video signal input for each frame Calculating the average luminance of the video signal, calculating the gain of the video signal from the table based on the calculated average luminance, and adjusting the video signal using the gain calculated by the gain calculation unit
- a luminance adjustment method is provided.
- the step of acquiring various conditions for adjusting the gain of the video signal, and the various conditions acquired by the setting condition acquisition unit Calculating a table representing the relationship between the average luminance and gain of the video signal, calculating the table in which the peak luminance and power consumption of the video signal can be set independently, and the video signal input for each frame Calculating the average luminance of the video signal, calculating the gain of the video signal from the table based on the calculated average luminance, and adjusting the video signal using the gain calculated by the gain calculation unit
- a program for causing a computer to execute is provided.
- the present invention it is possible to provide a display device, a luminance adjustment device, a luminance adjustment method, and a program capable of providing an optimal video according to a situation by individually adjusting peak luminance and power consumption. It becomes possible.
- FIG. 3 is a schematic diagram showing a method for controlling each of peak luminance and power consumption in the characteristics of the solid line in FIG. 2.
- FIG. 3 is a schematic diagram showing a method for controlling each of peak luminance and power consumption in the characteristics of the solid line in FIG. 2.
- It is a schematic diagram which shows an example of a structure of an electric current-luminance table calculating part.
- FIG. 8 is a functional block diagram illustrating a configuration of a display device including a backlight device. It is a schematic diagram which shows the structure of the backlight apparatus comprised from a light source control part and a surface light source.
- FIG. 1 is a schematic diagram showing a configuration of a display device 200 according to an embodiment of the present invention.
- the display device 200 is a device such as a television receiver, for example, and displays a television program or the like based on a video signal obtained from a broadcast wave.
- the display device 200 includes a brightness adjusting device 100 and a display panel 300.
- the video signal is input to the brightness adjusting apparatus 100, and the brightness is adjusted and sent to the display panel 300.
- the display panel 300 displays a video based on the adjusted video signal.
- the display panel 300 is constituted by a self-luminous panel.
- an organic EL panel is exemplified as the display panel 300.
- the display panel 300 receives a video signal whose luminance is adjusted, and displays a moving image or a still image by causing an organic EL element, which is an example of a self-light-emitting element, to emit light according to the input signal and pulse.
- the display panel 300 has a flat surface for displaying an image.
- An organic EL element is a self-luminous element that emits light when a voltage is applied, and the amount of light emitted is proportional to the voltage. Therefore, the IL characteristic (current-light emission amount characteristic) of the organic EL element also has a proportional relationship.
- the display device 100 When the display device 100 receives the supply of the video signal, the display device 100 displays the video through the display panel 300 by lighting the pixels arranged inside the display panel 300 in accordance with the video signal.
- the display panel 300 controls the amount of current based on the scanning line for selecting pixels at a predetermined scanning cycle, the data line for supplying luminance information for driving the pixels, and the luminance information, and emits light in accordance with the amount of current.
- Pixel circuits that emit light from the organic EL element, which is an element are arranged in a matrix. By configuring the scanning lines, the data lines, and the pixel circuits in this way, the display panel 300 can display an image according to the video signal.
- the brightness adjusting apparatus 100 includes a video signal memory 102, a video gain (Gain) block 104, a video-average luminance conversion block 106, and a setting condition acquisition unit 108.
- the setting condition acquisition unit 108 acquires peak luminance (maximum luminance value) information, power consumption information, environment information, and other setting conditions.
- the luminance adjustment apparatus 100 includes a current-luminance control table 110, a current-luminance table calculation unit 112, a chromaticity calculation unit 114, and a chromaticity setting unit 116.
- Each functional block shown in FIG. 1 can be configured by hardware (circuit) or an arithmetic processing unit (CPU) and software (program) for causing it to function.
- each functional block includes an arithmetic processing device and software
- the program can be stored in a recording medium such as a memory provided in the display device 200 or a memory inserted from the outside.
- the setting condition acquisition unit 110 and the current-brightness table calculation unit 112 may be configured by an arithmetic processing unit and software for causing the function to function, and other functional blocks may be configured by hardware.
- the brightness adjusting device 100 receives a video signal for displaying a video on the display panel 300.
- the video signal is input for each frame of the moving image.
- the brightness adjusting apparatus 100 adjusts the brightness in the video gain block 104 for each of the video signals for each frame, and also adjusts the chromaticity in the chromaticity setting unit 116 to make these adjustments.
- the video signal is sent to the display panel 300.
- the video signal memory 102 can be composed of a normal frame memory, and temporarily stores a video signal input for each frame.
- the video-average luminance conversion block 104 calculates the average luminance of one frame by averaging the luminance of all the pixels for each video signal for each frame. The calculated average luminance is sent to the current-luminance control table 110. The video signal is sent to the video gain block 104 for each frame.
- the image-average luminance conversion block 104 calculates the current flowing through the display panel 300.
- the current and the brightness are uniquely determined by a linear relationship. Therefore, the brightness of the video signal stored in the video signal memory 102 or the color difference signal, R, G, B The current consumption can be easily calculated from the signal.
- the current-luminance control table 110 holds a table that defines the relationship between average luminance and video gain.
- the current-luminance control table 110 is a table for converting the gain amount to be multiplied by the video signal from the average luminance (average video signal level) obtained from the video signal for controlling the maximum luminance or a current value equivalent thereto. .
- this table is created by the current-brightness table calculation unit 112 according to various conditions.
- the image gain is calculated based on the average luminance or the current value sent from the image-average luminance conversion block 104 using this table. The calculated video gain is sent to the video gain block 104.
- the video gain block 104 multiplies the corresponding video signal input from the video signal memory 102 by the video gain calculated by the current-brightness control table 110. Thereby, the brightness of the video signal is optimally adjusted.
- the video signal of the frame is adjusted using the video gain calculated based on the average luminance of the certain frame. be able to.
- the video signal memory 102 When the calculated video gain is used to adjust the video signal from the next frame onward, the video signal memory 102 is not provided, and the input video signal is input to the video gain block 104 and the video-average luminance.
- the conversion block 106 can be directly input. In this case, it is desirable to have an overcurrent control function for protecting the display panel 300.
- FIG. 2 is a characteristic diagram showing an example of a table held in the current-brightness control table 110, where the horizontal axis represents the average luminance of the video, and the vertical axis represents the video gain.
- the characteristic indicated by the solid line in FIG. 2 is a characteristic indicating the relationship between the average video luminance and the video gain, and is created by the current-luminance table calculation unit 112 according to various conditions.
- This characteristic is basically set so that the video gain decreases as the average luminance increases. Therefore, the video gain is set to a smaller value as the video is brighter and the average luminance is higher. Further, the video gain is set to a larger value as the video is darker and the average luminance is lower.
- the characteristic indicated by the broken line in FIG. 2 indicates the maximum power consumption of the display panel 300, and this characteristic is determined in advance based on the characteristic of the display panel 300.
- the power consumption of the display panel 300 can be reduced to the maximum value or less, and the deterioration of the display panel 300 is suppressed and the power consumption is suppressed. It is possible.
- the characteristics of the solid line shown in FIG. 2 are obtained at predetermined timings according to various conditions such as peak luminance information (peak information), information set by the user, power consumption information, and environment information. It is rewritten and set each time.
- the setting condition acquisition unit 108 has a function of acquiring these various conditions.
- the information on the peak luminance is a condition for setting the maximum luminance in the characteristic of the solid line in FIG.
- the information on the peak luminance is mainly determined by information set by the user (user setting information) and environment information (information such as temperature, humidity, brightness, and color temperature of the place where the display device 200 is placed). Information.
- the user setting information is information that is set by the user operating an operation button (not shown) of the display device 200.
- the user can set these pieces of information to values according to his / her preference by operating the operation buttons.
- the current-luminance table calculation unit 112 sets the characteristic of the solid line in FIG. 2 so that the peak luminance is lowered. In this case, the characteristic of the solid line in FIG. 2 is changed so that the maximum value of the video gain becomes smaller.
- the display device 200 can include a temperature sensor, a humidity sensor, a luminance sensor, a color temperature sensor, and the like for acquiring environmental information, and the environmental information can be acquired from these sensors.
- the environment information may be acquired from a predetermined database 400.
- the database 400 and the brightness adjusting apparatus 100 may be connected via a network such as the Internet 500.
- the current-brightness table calculation unit 112 sets the characteristic of the solid line in FIG. 2 so that the peak brightness is higher. To do. As a result, even in a bright room or the like, it is possible to display an image that can be easily viewed by the viewer on the display panel 300.
- the video signal is input to the setting condition acquisition unit 108.
- the current-luminance table calculation unit 112 sets the characteristic of the solid line in FIG. 2 so that the peak luminance is low. Thereby, it can suppress that a viewer feels dazzling.
- the power consumption information is information corresponding to the characteristics of the broken line in FIG. 2 described above, and is determined in advance according to the characteristics of the display panel 300.
- the current-brightness table calculation unit 112 sets the average luminance and video gain characteristics indicated by the solid line to be equal to or lower than the broken line characteristics. Thereby, it is suppressed that panel power consumption exceeds an allowable range, and deterioration of the display panel 300 can be suppressed. In addition, the power consumption of the display device 200 can be minimized.
- the current-brightness table calculation unit 112 sets the characteristic indicated by the solid line so as to overlap the characteristic indicated by the broken line. Thereby, it can suppress reliably that power consumption exceeds an allowable range.
- the setting condition acquisition unit 108 acquires various metadata as other information.
- the metadata is information acquired from a video signal, for example, and includes information such as video genre (news program, drama, movie, etc.), video title, current weather (when the video is a weather forecast), and the like. .
- Various metadata may be acquired from the database 400.
- the current-luminance table calculation unit 112 sets the characteristics so that the peak luminance is lowered when it is detected from the video signal or the metadata obtained from the database 400 that the video is a variety program. Thereby, when airing a program with comparatively high average brightness, such as a variety program, it can suppress that a viewer senses excessive glare. In addition, for example, when displaying a starry sky image, it is possible to provide a clearer starry sky image by increasing the peak luminance.
- the current-brightness table calculation unit 112 performs calculation based on the various setting conditions acquired by the setting condition acquisition unit 108, and sets the characteristic indicated by the solid line in FIG. For example, when it is detected by the luminance sensor that acquires the environmental information as described above that the external light luminance is high in the place where the display device 200 is placed, the solid line in FIG. 2 is set so that the peak luminance becomes higher. Set characteristics. In addition, when a setting for reducing the power consumption is made, such as when the user sets the energy saving mode, the characteristic of the solid line in FIG. 2 is set so that the power consumption becomes lower.
- FIG. 3 and 4 are schematic diagrams showing a method for controlling each of the peak luminance and the power consumption in the characteristics of the solid line in FIG.
- FIG. 3 shows a technique for controlling peak luminance
- FIG. 4 shows a technique for controlling power consumption.
- the characteristic is changed in the direction indicated by the arrow in FIG. 3 while maintaining the power consumption, and only the peak luminance is controlled.
- the characteristic is changed in the direction indicated by the arrow in FIG. 4 while maintaining the peak luminance, and only the power consumption is changed.
- the peak luminance and the power consumption are individually controlled within the range not exceeding the characteristics of the broken line in FIG. It becomes possible to optimally adjust the luminance of the signal.
- the calculation by the current-luminance table calculation unit 112 is performed, for example, every 200 [ms] to 1 [s], and the characteristics of the table indicated by the solid line in FIG. 2 are rewritten each time. The characteristics may be rewritten every frame.
- FIG. 5 is a schematic diagram illustrating an example of the configuration of the current-luminance table calculation unit 112.
- the current-brightness table calculation unit 112 includes an external light coefficient setting unit 112a, a temperature coefficient setting unit 112b, a chromaticity coefficient setting unit 112c, a genre table 112d, a user coefficient setting unit 112e, and a current-brightness table.
- a computing unit 112f is provided.
- the external light coefficient setting unit 112a sets a coefficient based on the luminance of external light input as environment information.
- the temperature coefficient setting unit 112b sets a coefficient based on the temperature input as environment information.
- the chromaticity coefficient setting unit 112c sets a coefficient based on chromaticity input as environment information.
- the genre table 112d sets a coefficient based on the genre of video input as metadata.
- the user coefficient setting unit 112e sets a coefficient based on a setting value set by the user.
- the current-brightness table calculator 112f is based on the coefficients set by the external light coefficient setting unit 112a, the temperature coefficient setting unit 112b, the chromaticity coefficient setting unit 112c, the genre table 112d, and the user coefficient setting unit 112e. The characteristic of the solid line shown in is calculated.
- the peak luminance and the power consumption in the current-luminance adjustment table can be individually controlled according to various conditions.
- power consumption can be reduced in a state in which all the contrast feeling inherent in the video signal, the gloss of the object or human skin, etc. are maintained.
- the chromaticity calculation unit 114 calculates the optimum chromaticity for the video signal of each frame according to each setting condition acquired by the setting condition acquisition unit 108 and sends the calculated chromaticity to the chromaticity setting unit 116.
- the chromaticity setting unit 116 sets the chromaticity of the video signal based on the chromaticity calculated by the chromaticity calculation unit 114.
- the video signal whose chromaticity is set by the chromaticity setting unit 116 is sent to the display panel 300.
- chromaticity is a concept including color temperature
- the chromaticity setting unit 116 adjusts the color temperature of video data and also adjusts the hues of R, G, and B.
- FIG. 6 is a schematic diagram showing a specific configuration of the chromaticity calculation unit 114.
- the chromaticity calculation unit 114 includes an external light coefficient setting unit 114a, a temperature coefficient setting unit 114b, a chromaticity coefficient setting unit 114c, a genre table 114d, a user coefficient setting unit 114e, and a chromaticity calculation unit 114f.
- the external light coefficient setting unit 114a sets a coefficient of chromaticity based on the luminance of external light input as environment information.
- the temperature coefficient setting unit 114b sets a coefficient based on the temperature input as environment information.
- the chromaticity coefficient setting unit 114c sets a coefficient based on chromaticity input as environment information.
- the genre table 114d sets coefficients based on the genre of video input as metadata.
- the user setting unit 114e sets a coefficient based on a setting value set by the user.
- the chromaticity calculator 114f has an optimum chromaticity based on the coefficients set by the external light coefficient setting unit 114a, the temperature coefficient setting unit 114b, the chromaticity coefficient setting unit 114c, the genre table 114d, and the user coefficient setting unit 114e. Is calculated.
- the brightness adjusting apparatus 100 it is possible to optimally adjust the chromaticity of the video signal for each frame based on various conditions such as user settings and environmental conditions. . Therefore, it is possible to display optimal video according to various conditions by individually controlling peak luminance and power consumption and optimally controlling chromaticity.
- FIG. 7 is a flowchart showing processing performed by the brightness adjustment apparatus 100.
- step S ⁇ b> 10 various setting conditions are acquired by the setting condition acquisition unit 108.
- step S12 the peak luminance and the power consumption are individually set based on various setting conditions by the current-luminance control table 110, and the table shown in FIG. 2 is calculated.
- the calculated table is stored as a current-luminance control table 110.
- the chromaticity calculation unit 114 calculates the chromaticity of the video signal based on various setting conditions.
- one frame of video signal is stored in the video signal memory 102.
- the video-average luminance conversion block 104 averages the luminance of all pixels of one frame of video signal stored in the video signal memory 102, and calculates the average luminance of one frame.
- next step S20 the average luminance calculated in step S18 is input to the current-luminance control table 110, and the video gain is calculated from the average luminance.
- next step S22 one frame of video signal stored in the video signal memory 102 is sent to the video gain block 104 and multiplied by the video gain calculated in step S20.
- the video signal multiplied by the video gain is sent to the chromaticity setting unit 116, and the chromaticity of the video signal is set to the chromaticity calculated in step S14.
- a computer program created so as to execute the processing is recorded in advance on a recording medium inside the display device 200, and the computer device sequentially reads out and executes the computer program. You may go by.
- FIG. 8 is a functional block diagram illustrating a configuration of a display device 1000 including a backlight device.
- the backlight device 1000 is composed of a liquid crystal display device.
- the display device 1000 controls a display panel 1200 having a color filter substrate, a liquid crystal layer, and the like, a surface light source 1300 disposed on the back side of the display panel 1200, the display panel 1200, and the surface light source 1300.
- Display device 1100 displays the original image corresponding to the image signal in a predetermined display area (area corresponding to display unit 1202 of display panel 1200). Note that the input image signal input to the display device 1100 corresponds to, for example, an image (frame image) with a frame rate of 60 Hz.
- the display panel 1200 includes a display unit 1202 in which a plurality of openings that transmit white light from the surface light source 1300 are arranged.
- the display panel 1200 includes a source driver 1204 and a gate driver 1206 that send drive signals to transistors (TFTs: Thin Film Transistors (not shown)) provided in the respective openings of the display unit 1202.
- TFTs Thin Film Transistors
- the white light that has passed through the opening of the display unit 1202 is converted into red, green, or blue light by a color filter formed on a color filter substrate (not shown).
- a set of three openings that emit red, green, and blue light corresponds to one pixel of the display unit 1202.
- the surface light source 1300 emits white light in the light emitting area corresponding to the display unit 1202.
- the light emission area of the surface light source 1300 is divided into a plurality of blocks (areas), and light emission is controlled individually for each of the divided blocks.
- the control unit 1400 includes a display luminance calculation unit 1402, a light source control unit 1404, and a display panel control unit 1406.
- the display luminance calculation unit 1402 is supplied with an image signal corresponding to each frame image.
- the display luminance calculation unit 1402 obtains the luminance distribution of the frame image from the supplied image signal, and further calculates the necessary display luminance for each block from the luminance distribution of the frame image.
- the calculated display luminance is supplied to the light source control unit 1404 and the display panel control unit 1406.
- the light source control unit 1404 calculates the backlight luminance in each block of the surface light source 1300 based on the display luminance of each block supplied from the display luminance calculation unit 402. Then, the light source control unit 1404 controls the light emission amount of the light emitting diodes 1330 of each block so as to obtain the calculated backlight luminance by PWM (Pulse Width Modulation) control.
- PWM Pulse Width Modulation
- the light emission luminance of the surface light source 1300 can be controlled for each block in accordance with the input image signal, optimal light emission according to the image displayed on the display panel 1200 is possible.
- controlling the light emission luminance of the surface light source 1300 for each block according to the input image signal may be referred to as divided light emission drive or partial light emission drive.
- the light source control unit 1404 also performs light emission control for correcting light emission luminance or chromaticity based on the light emission luminance or chromaticity of each block detected by a sensor arranged in the backlight 1300.
- the sensor is an illuminance sensor or a color sensor.
- the backlight luminance of each block of the surface light source 1300 calculated by the light source control unit 1404 is supplied to the display panel control unit 1406.
- the display panel control unit 1406 displays the liquid crystal aperture of each pixel of the display unit 1202 based on the display luminance for each block supplied from the display luminance calculation unit 1402 and the backlight luminance for each block supplied from the light source control unit 1404. Calculate the rate. Then, the display panel control unit 1406 supplies drive signals to the source driver 1204 and the gate driver 1206 of the display panel 200 so as to obtain the calculated liquid crystal aperture ratio, and drives and controls the TFTs of each pixel of the display unit 202. .
- the power supply unit 1410 supplies predetermined power to each unit of the display device 100.
- FIG. 9 is a schematic diagram showing a configuration of a backlight device 1500 including a light source control unit 1404 and a surface light source 1300.
- the light source control unit 1404 has the same configuration as that of the luminance control apparatus 100 described with reference to FIG. That is, the light source control unit 1404 includes the memory 102, the gain block 104, the average luminance conversion block 106, and the setting condition acquisition unit 108.
- the brightness adjusting apparatus 100 includes a current-luminance control table 110.
- Each functional block shown in FIG. 9 can be configured by hardware (circuit) or an arithmetic processing unit (CPU) and software (program) for causing it to function. When each functional block includes an arithmetic processing device and software, the program can be stored in a recording medium such as a memory provided in the display device 200 or a memory inserted from the outside.
- the backlight brightness in each block of the surface light source 1300 calculated by the light source control unit 1404 is input to the memory 102.
- the video-average luminance conversion block 104 calculates the average luminance of one frame by averaging the luminance of each block for each luminance signal for each frame. The calculated average luminance is sent to the current-luminance control table 110. The luminance signal is sent to the gain block 104 every frame.
- the current-luminance control table 110 holds a table that defines the relationship between average luminance and gain.
- the current-luminance control table 110 is a table for converting the gain amount to be multiplied by the video signal from the average luminance (average video signal level) obtained from the video signal for controlling the maximum luminance or a current value equivalent thereto. .
- This table is created by the current-brightness table calculation unit 112 according to various conditions.
- the image gain is calculated based on the average luminance sent from the image-average luminance conversion block 104 using the created table.
- the calculated video gain is sent to the video gain block 104.
- the gain block 104 multiplies the corresponding luminance signal input from the memory 102 by the gain calculated in the current-luminance control table 110. Thereby, the brightness of the surface light source 1300 is optimally adjusted.
- the gain is adjusted based on the luminance signal in the backlight device 1500 such as a liquid crystal display device
- the peak luminance and the power consumption can be individually controlled.
- the present invention can be widely applied to display devices used for television receivers, for example.
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Abstract
Description
1.本発明の一実施形態にかかる表示装置の構成
2.電流-輝度制御テーブルに保持されているテーブルの一例
3.映像ゲインを設定するための各種情報について
4.ピーク輝度と消費電力のそれぞれを制御する手法
5.電流-輝度テーブル演算部の構成の一例
6.映像信号の色度を調整する構成について
7.輝度調整方法の処理手順について
8.バックライト装置への適用について
図1は、本発明の一実施形態に係る表示装置200の構成を示す模式図である。表示装置200は、例えばテレビ受像器などの装置であり、放送波から得られた映像信号に基づいて、テレビ番組等を表示するものである。表示装置200は、輝度調整装置100と表示パネル300とを備えている。映像信号は、輝度調整装置100へ入力され、輝度が調整されて表示パネル300に送られる。表示パネル300は、調整された映像信号に基づいて映像を表示する。
図2は、電流-輝度制御テーブル110に保持されているテーブルの一例を示す特性図であり、横軸は映像の平均輝度を、縦軸は映像ゲインを示している。
以下、設定条件取得部108で取得される各種情報について説明する。ピーク輝度の情報は、図2中の実線の特性における最大輝度を設定するための条件である。ピーク輝度の情報は、主として、ユーザによって設定された情報(ユーザ設定情報)と、環境情報(表示装置200が置かれている場所の温度、湿度、明るさ、色温度等の情報)とによって決定される情報である。
電流-輝度テーブル演算部112により、ピーク輝度が低くなるように図2の実線の特性が設定される。この場合、映像ゲインの最大値がより小さくなるように図2の実線の特性が変更される。
図3及び図4は、図2の実線の特性において、ピーク輝度と消費電力のそれぞれを制御する手法を示す模式図である。ここで、図3はピーク輝度を制御する手法を示しており、図4は消費電力を制御する手法を示している。
図5は、電流-輝度テーブル演算部112の構成の一例を示す模式図である。図5に示すように、電流-輝度テーブル演算部112は、外光係数設定部112a、温度係数設定部112b、色度係数設定部112c、ジャンルテーブル112d、ユーザ係数設定部112e、電流-輝度テーブル演算器112fを備えている。外光係数設定部112aは、環境情報として入力された外光の輝度に基づく係数を設定する。温度係数設定部112bは、環境情報として入力された温度に基づく係数を設定する。色度係数設定部112cは、環境情報として入力された色度に基づく係数を設定する。ジャンルテーブル112dは、メタデータとして入力された映像のジャンルに基づく係数を設定する。ユーザ係数設定部112eは、ユーザによって設定された設定値に基づく係数を設定する。
次に、本実施形態に係る輝度調整装置100において、映像信号の色度を調整する色度演算部114、及び色度設定部116について説明する。色度演算部114は、設定条件取得部108で取得された各設定条件に応じて、各フレームの映像信号に対して最適な色度を算出し、色度設定部116へ送る。色度設定部116は、色度演算部114で演算された色度に基づいて、映像信号の色度を設定する。色度設定部116により色度が設定された映像信号は、表示パネル300へ送られる。ここで色度は色温度を含む概念であり、色度設定部116は、映像データの色温度の調整をするとともに、R,G,Bの色合いの調整も行う。
次に、輝度調整装置100で行われる処理について説明する。図7は、輝度調整装置100で行われる処理を示すフローチャートである。先ず、ステップS10では、設定条件取得部108により、各種設定条件が取得される。次のステップS12では、電流-輝度制御テーブル110により、各種設定条件に基づいて、ピーク輝度と消費電力が個別に設定されて、図2に示すテーブルが演算される。演算されたテーブルは、電流-輝度制御テーブル110として格納される。
次に、本発明をバックライト装置に適用した実施形態について説明する。上述の例では、有機ELパネルを備える表示装置200の輝度調整装置100において、ピーク輝度と消費電力を個別に制御する構成について説明した。一方、同様の構成で液晶表示装置等に用いられるバックライト装置を構成することも可能である。図8は、バックライト装置を備える表示装置1000の構成を示す機能ブロック図である。図8において、バックライト装置1000は液晶表示装置から構成される。
104 映像ゲインブロック
106 映像-平均輝度換算ブロック
108 設定条件取得部
110 電流-輝度制御テーブル
112 電流-輝度テーブル演算部
200 表示装置
300 表示パネル
Claims (10)
- 映像信号のゲインを調整するための各種条件を取得する設定条件取得部と、
前記設定条件取得部で取得された各種条件に基づいて、映像信号の平均輝度とゲインとの関係を表すテーブルを演算し、映像信号のピーク輝度と消費電力を独立して設定可能な前記テーブルを演算するテーブル演算部と、
フレーム毎に入力される映像信号の平均輝度を算出する平均輝度算出部と、
前記平均輝度算出部で算出された前記平均輝度に基づいて、前記テーブルから映像信号のゲインを算出するゲイン算出部と、
前記ゲイン算出部で算出されたゲインを用いて映像信号を調整する映像信号調整部と、
映像信号に応じて自発光する複数の画素が配置され、前記映像信号調整部により調整された映像信号に基づいて映像を表示する表示パネルと、
を備える、表示装置。 - 前記設定条件取得部は、表示装置の周辺の環境を表す環境情報、ユーザによって設定されるユーザ設定情報、前記表示パネルが許容する最大消費電力の情報、又は映像の種別を表すメタデータの情報を含む前記各種条件を取得する、請求項1に記載の表示装置。
- 前記映像信号調整部の前段に設けられ、ゲインが乗算されるフレームの映像信号を一時的に保持するメモリを更に備える、請求項1に記載の表示装置。
- 前記設定条件取得部で取得された各種条件に基づいて、映像信号の色度を演算する色度演算部と、
前記色度演算部で演算された色度を用いて映像信号の色度を調整する色度調整部と、
を更に備える、請求項1に記載の表示装置。 - 映像信号のゲインを調整するための各種条件を取得する設定条件取得部と、
前記設定条件取得部で取得された各種条件に基づいて、映像信号の平均輝度とゲインとの関係を表すテーブルを演算し、映像信号のピーク輝度と消費電力を独立して設定可能な前記テーブルを演算するテーブル演算部と、
フレーム毎に入力される映像信号の平均輝度を算出する平均輝度算出部と、
前記平均輝度算出部で算出された前記平均輝度に基づいて、前記テーブルから映像信号のゲインを算出するゲイン算出部と、
前記ゲイン算出部で算出されたゲインを用いて映像信号を調整する映像信号調整部と、
を備える輝度調整装置。 - 前記設定条件取得部は、表示装置の周辺の環境を表す環境情報、ユーザによって設定されるユーザ設定情報、前記表示パネルが許容する最大消費電力の情報、又は映像の種別を表すメタデータの情報を含む前記各種条件を取得する、請求項5に記載の輝度調整装置。
- 前記映像信号調整部の前段に設けられ、ゲインが乗算されるフレームの映像信号を一時的に保持するメモリを更に備える、請求項5に記載の輝度調整装置。
- 前記設定条件取得部で取得された各種条件に基づいて、映像信号の色度を演算する色度演算部と、
前記色度演算部で演算された色度を用いて映像信号の色度を調整する色度調整部と、
を更に備える、請求項5に記載の輝度調整装置。 - 映像信号のゲインを調整するための各種条件を取得するステップと、
前記設定条件取得部で取得された各種条件に基づいて、映像信号の平均輝度とゲインとの関係を表すテーブルを演算し、映像信号のピーク輝度と消費電力を独立して設定可能な前記テーブルを演算するステップと、
フレーム毎に入力される映像信号の平均輝度を算出するステップと、
算出された前記平均輝度に基づいて、前記テーブルから映像信号のゲインを算出するステップと、
前記ゲイン算出部で算出されたゲインを用いて映像信号を調整するステップと、
を備える、輝度調整方法。 - 映像信号のゲインを調整するための各種条件を取得するステップと、
前記設定条件取得部で取得された各種条件に基づいて、映像信号の平均輝度とゲインとの関係を表すテーブルを演算し、映像信号のピーク輝度と消費電力を独立して設定可能な前記テーブルを演算するステップと、
フレーム毎に入力される映像信号の平均輝度を算出するステップと、
算出された前記平均輝度に基づいて、前記テーブルから映像信号のゲインを算出するステップと、
前記ゲイン算出部で算出されたゲインを用いて映像信号を調整するステップと、
をコンピュータに実行させるためのプログラム。
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RU2011121563/07A RU2011121563A (ru) | 2008-12-11 | 2009-12-02 | Устройство отображения, устройство регулирования яркости, способ регулирования яркости и программа |
CN200980155265.6A CN102292757B (zh) | 2008-12-11 | 2009-12-02 | 显示设备、亮度调整设备、调整亮度的方法和程序 |
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Also Published As
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TW201031181A (en) | 2010-08-16 |
JP5321032B2 (ja) | 2013-10-23 |
US20110227966A1 (en) | 2011-09-22 |
TWI429278B (zh) | 2014-03-01 |
BRPI0921544A2 (pt) | 2016-02-10 |
US20140307170A1 (en) | 2014-10-16 |
RU2011121563A (ru) | 2012-12-10 |
AU2009325583A1 (en) | 2010-06-17 |
CN102292757A (zh) | 2011-12-21 |
JP2010139780A (ja) | 2010-06-24 |
EP2381437A1 (en) | 2011-10-26 |
US8730275B2 (en) | 2014-05-20 |
KR20110098903A (ko) | 2011-09-02 |
CN102292757B (zh) | 2014-06-18 |
US9294748B2 (en) | 2016-03-22 |
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