WO2007091508A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2007091508A1 WO2007091508A1 PCT/JP2007/051903 JP2007051903W WO2007091508A1 WO 2007091508 A1 WO2007091508 A1 WO 2007091508A1 JP 2007051903 W JP2007051903 W JP 2007051903W WO 2007091508 A1 WO2007091508 A1 WO 2007091508A1
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- video signal
- light source
- liquid crystal
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- input mode
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
Definitions
- the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which the light emission luminance of a backlight light source is changed according to an input video signal.
- a liquid crystal display device including a liquid crystal panel that modulates light source light according to a video signal and a knock light source for illuminating the liquid crystal panel
- the light emission luminance of the backlight light source is controlled according to the input video signal Therefore, there is known a technology for improving the quality of displayed images.
- an average luminance level (Average Picture Level (hereinafter referred to as "APL") in one frame is calculated as the feature amount of the input video signal, and the emission luminance of the backlight light source is adjusted according to the APL.
- APL Average luminance level
- Patent Document 1 describes an image with optimal screen brightness for an observer by improving visual contrast and reproducing a high-quality image with glossiness while avoiding black floating interference.
- a liquid crystal display device for providing the above is disclosed.
- the liquid crystal display device of Patent Document 1 detects the APL of the input video signal and controls the luminance of the backlight light source according to the detected APL. Further, the peak value of the input video signal is detected, and the control characteristic of the light emission luminance of the backlight light source is corrected according to this peak value.
- a general liquid crystal television receiver has an input mode for inputting and displaying various images such as personal computer (hereinafter referred to as PC) video and game video in addition to television video.
- PC personal computer
- game video in addition to television video.
- a backlight is linked to a setting for switching between a display mode for displaying television images and a display mode for displaying computer images.
- By variably controlling the light emission brightness (light emission intensity) of the light source it is possible to obtain an appropriate screen brightness in each mode to achieve easier viewing and image display for both television images and computer images, as well as power consumption.
- An image display device capable of reducing the above has been disclosed.
- Patent Document 1 JP 2004-258669 A
- Patent Document 2 Japanese Patent Laid-Open No. 2006-11366
- the brightness control of the backlight light source according to the feature amount (APL, etc.) of the video signal according to the prior art including Patent Document 1 has a scene that gives viewers a sense of incongruity. .
- the PC input mode is set as the input mode of the liquid crystal display device and the background image 50a is displayed on the PC screen as shown in FIG. 7 (A)
- the user starts the application.
- the application image (window) 51 is overwritten on the background image 50b as shown in FIG. 7B, and the APL of the entire screen changes depending on the display of the image 51.
- the display brightness changes due to the brightness control of the backlight light source according to the APL of the input video signal. Therefore, the background brightness 50a and 50b should be displayed with the same brightness, although the display brightness should be displayed.
- ⁇ ⁇ Viewers have a sense of incongruity.
- the video content is played back by the video player using the PC as shown in FIG. 8, while the word processor software is displayed for the user work as shown in the word processor image 61, Then, since the APL changes according to the playback video 62 that is a moving image, the display brightness of the word processor image 61 and the background image 60 changes due to the change in the backlight luminance, which makes the viewer feel uncomfortable. .
- the browser image 71a is displayed on the background image 70. It is assumed that the browser image 71b is displayed as shown in Fig. 9 (B) after moving to the home page B).
- the display luminance changes due to the luminance control of the backlight light source according to the APL of the input video signal.
- the browser has a toolbar Since there is a fixed part such as the toolbar image 72a, 72b of that part should be displayed with the same brightness, the display brightness changes and the viewer feels uncomfortable. Similarly, the display brightness of the menu column images 73a and 73b changes, which makes the viewer feel uncomfortable.
- CG photo processing and computer graphics
- the APL also changes, and the display brightness varies due to the brightness control of the backlight source according to the APL of the input video signal.
- the brightness of the photo changes further due to fluctuations in the display brightness, making it impossible to correct the photo.
- the display brightness will change during painting, making it impossible to create the picture you want.
- the present invention has been made in view of the above circumstances, and provides a liquid crystal display device capable of stopping brightness control of a backlight light source with respect to a feature amount of an input video signal in accordance with an input mode.
- the purpose is to do.
- a first technical means of the present invention includes a liquid crystal panel that displays an image and a light source that illuminates the liquid crystal panel, according to a feature amount of an input video signal.
- a liquid crystal display device that variably controls the light emission luminance of the light source
- the light emission luminance of the light source is set. It is characterized in that it is held constant regardless of the feature quantity of the input video signal.
- the second technical means includes a liquid crystal panel that displays an image and a light source that illuminates the liquid crystal panel, and a liquid crystal display that variably controls the light emission luminance of the light source in accordance with a feature amount of an input video signal.
- a liquid crystal panel that displays an image and a light source that illuminates the liquid crystal panel
- a liquid crystal display that variably controls the light emission luminance of the light source in accordance with a feature amount of an input video signal.
- a third technical means is characterized in that, in the first or second technical means, the input mode for inputting the predetermined video signal is an input mode for inputting a computer video signal. is there.
- a fourth technical means is the first or second technical means, characterized in that the input mode for inputting the predetermined video signal is an input mode for inputting a game video signal. .
- a fifth technical means is the first or second technical means, wherein the input mode for inputting the predetermined video signal is an input mode for inputting an electronic book video signal. is there.
- the present invention it becomes possible to stop the luminance control of the backlight light source with respect to the feature quantity of the input video signal according to the input mode, and when the change in display luminance adversely affects the display quality, Since the display brightness can be kept constant, it is possible to prevent the viewer from feeling uncomfortable.
- FIG. 1 is a schematic block diagram for explaining a configuration of an embodiment of a liquid crystal display device according to the present invention.
- FIG. 2 is a block diagram for explaining a configuration of another embodiment of the liquid crystal display device according to the present invention.
- FIG. 3 is a diagram showing a configuration example of a backlight unit applicable to the liquid crystal display device of the present invention.
- FIG. 4 is a diagram showing another configuration example of a backlight unit applicable to the liquid crystal display device of the present invention.
- FIG. 7 is a diagram for explaining an example of a scene in which the luminance control of the backlight light source with respect to the video signal feature amount according to the APL of the video signal according to the prior art gives a viewer a sense of incongruity.
- FIG. 8 is a diagram for explaining another example of the situation in which the luminance control of the backlight light source with respect to the feature amount of the video signal according to the APL of the video signal according to the conventional technology gives the viewer a sense of incongruity.
- FIG. 9 is a diagram for explaining another example of the scene in which the luminance control of the backlight light source with respect to the feature amount of the video signal according to the APL of the video signal according to the conventional technology gives the viewer a sense of incongruity.
- FIG. 10 is a diagram for explaining another example of a scene in which luminance control of the backlight light source with respect to the feature amount of the video signal according to the APL of the video signal according to the conventional technology gives the viewer a sense of incongruity.
- FIG. 1 is a schematic block diagram for explaining a configuration of an embodiment of a liquid crystal display device according to the present invention, in which 1 is a liquid crystal display device.
- the liquid crystal display device 1 includes a selector 2, an input mode control unit 3, an image adjustment unit 4, a liquid crystal (LCD) controller 6, a liquid crystal display unit (liquid crystal panel) 7, a light source (not shown), and a backlight unit 8 Is provided.
- the liquid crystal display device 1 according to the present invention includes a backlight light source luminance control unit 5 as its main feature.
- the selector 2 selects a plurality of video signals such as an analog television (TV) signal, a digital television (TV) signal, a television video signal (video signal) such as a component signal, a PC video signal, and a game video signal.
- the input signal is selected and switched according to the input mode instructed by the input mode control unit 3 and output to the video adjustment unit 4 and the luminance control unit 5 of the backlight source.
- the input mode control unit 3 receives a user operation or the like, instructs the selector 2 to switch the input mode, and sends the current input mode to the luminance control unit 5 of the backlight light source.
- the television video signal means not only the built-in analog TV tuner and digital TV tuner, but also the device power connected to an external video input terminal such as a video input terminal or a component input terminal.
- the PC video signal is the video signal from the PC connected to the PC input terminal (PC connection terminal)
- the game video signal is the game machine power connected to the game input terminal (game equipment connection terminal).
- the brightness control unit 5 of the knock light source detects the feature amount (APL or the like) of the input video signal obtained from the selector 2, and controls the light emission luminance of the backlight light source according to the feature amount. Is output to the backlight unit 8. If the brightness control unit 5 of the knocklight light source determines that it is a TV video input mode for inputting a television video signal (video signal) based on the notification from the input mode control unit 3, the video signal The brightness control of the backlight light source is executed with respect to the feature amount of the backlight.
- APL feature amount
- the brightness control unit 5 of the knock light source is selected.
- the backlight unit 8 is controlled so that the emission brightness of the knock light source is kept constant regardless of the feature quantity of the input video signal.
- the brightness control unit 5 of the knock light source does not transmit the light emission luminance control signal to the backlight unit 8 in the PC input mode or the game input mode, or the characteristic value of the video signal.
- the luminance control of the backlight source with respect to the feature amount of the video signal is stopped by transmitting a light emission luminance control signal instructing to stop the luminance control of the light source.
- the luminance control unit 5 of the backlight light source according to the current input mode information transmitted from the input mode control unit 3, Performs brightness control (on) and Z stop (off).
- images other than at least one television video signal (video signal) and at least one television video signal (video signal) are used. If the signal is input to the selector 2 and is configured!
- Constant includes a variation of ⁇ 1%, which is regarded as a range in which the viewer cannot recognize the change even if the luminance changes due to Weber's Law.
- the light emission luminance of the backlight light source is lOOOOcdZm 2 (candela / square meter)
- the fluctuation of the light emission luminance of the knock light source is maintained in the range of 9100 to 10100 cdZm 2 .
- the video adjustment unit 4 performs various video processing on the video signal output from the selector 2 to adjust the video, and sends the video to the LCD controller 6.
- the LCD controller 6 controls the liquid crystal panel 7 based on the adjusted video signal received from the video adjustment unit 4.
- the liquid crystal panel 7 is a panel that displays an image based on the control of the LCD controller 6.
- the backlight unit 8 irradiates the liquid crystal panel 7 in accordance with the luminance control unit 5 of the knock light source and the light emission luminance control signal transmitted to the microcomputer, which is not shown.
- an input mode for inputting the predetermined video signal for example, an input mode for inputting a computer video signal (PC input mode) or an input mode for inputting a game video signal (game input mode), Alternatively, by applying both of these input modes, it is possible to prevent the viewer from feeling uncomfortable as shown in the prior art.
- an input mode for inputting the predetermined video signal various input modes such as an input mode for inputting an electronic book video signal from an external storage medium such as a memory card (electronic book input mode) can be applied. .
- the video displayed on the liquid crystal panel 7 is mainly a still image, and the characteristics of the video signal are whatever the video is.
- the brightness control of the backlight source with respect to the feature amount of the video signal causes the display brightness to change, giving the viewer a sense of discomfort. To do.
- the luminance control of the backlight light source with respect to the feature amount of the video signal is stopped, the emission luminance of the backlight light source is held constant regardless of the video feature amount. Even when the brightness control of the backlight light source for the feature quantity is stopped, it does not stop until the luminance change due to factors other than the video feature quantity (for example, brightness sensor, user operation, etc.).
- FIG. 2 is a block diagram showing the inside of the brightness control unit 5 in FIG. 1.
- the input video signal is output to the APL measurement unit 11.
- the APL measurement unit 11 measures the APL for each frame of the input video signal.
- the measured APL is sent to filter 12.
- the APL corresponds to one of the video feature amounts of the present invention, and the emission luminance control of the backlight light source according to the APL is performed based on the luminance control characteristic of the luminance control table 15.
- the APL is measured by the video signal output from the selector 2.
- the APL may be measured after the video processing by the video adjustment unit 4.
- OSD on-screen display
- scaling processing scaling processing
- letterbox display black mask etc. is used to control the screen area). Limited
- measuring the APL from the video signal output from the selector 2 means that the input video signal is not affected by the video processing by the video adjustment unit 4. It is possible to control the light emission luminance of the backlight light source corresponding to the feature amount. Therefore, it is more preferable to measure APL from the video signal before video processing as shown in FIGS.
- a plurality of thin fluorescent tubes 31 are arranged at equal intervals in a housing 30 attached to the back surface of the liquid crystal panel 20. Configured. Further, the diffusing plate 32 uniformly diffuses the illumination light emitted from the fluorescent tube 31.
- the backlight unit 8 has a signal period ratio between the high potential level of the rectangular wave and the low potential level in accordance with the backlight luminance control signal input from the backlight control unit 13 of the luminance control unit 5.
- a dimming control circuit that outputs a pulse width modulation output with varying (duty) as a dimming signal, and receives the dimming signal from the dimming control circuit and generates an AC voltage with a period and voltage according to the dimming signal
- an inverter (none of which is shown) that is applied to the fluorescent tube 31 and driven to light.
- the inverter operates when the output of the dimming control circuit is at a high potential level, stops operating when the output is at a low potential level, and performs intermittent operation according to the output duty of the dimming control circuit. The brightness of is adjusted.
- the knock light unit 8 includes a multi-color LED light source having three primary color powers of red, green, and blue in a housing 30 attached to the back of the liquid crystal panel 20. That is, a red light source 41, a green light source 42, and a blue light source 43 may be provided. The brightness of the LED light source can be controlled by the LED current for each LED light source.
- a knock light unit 8 having a method using a fluorescent tube and an LED in combination as described above can be applied.
- the liquid crystal panel 20 may be illuminated by a so-called side edge type configuration in which light from a light source such as a fluorescent tube or LED is made uniform by using a light guide plate.
- the filter 12 in FIG. 2 regulates the followability to the APL change between frames when controlling the light emission luminance of the backlight light source according to the measured value of APL. It consists of a staged digital filter.
- the filter 12 inputs the APL for each frame measured by the APL measurement unit 11, and each frame is weighted with the APL for one or more frames in the past. Calculate the output APL by performing the weighted average operation according to the above.
- the number of past frame steps to be reflected in the frame can be variably set, and a weight is set for each of the current frame and the past frame (for the set number of steps).
- the APL of the current frame and the APL of the delay frame corresponding to the number of used stages are weighted and averaged according to the respective weights and output. This makes it possible to set the output APL follow-up according to the actual APL change as appropriate.
- the APL output from the filter 12 is input to the knocklight control unit 13.
- the knock light control unit 13 outputs a knock light luminance control signal for adjusting the light emission luminance of the backlight light source according to the input APL based on the luminance control table (lookup table) 15 to be used. As described above, the light emission luminance of the backlight light source is controlled in accordance with the backlight luminance control signal output from the knock light control unit 13.
- the luminance control table 15 defines the relationship of the light emission luminance of the backlight light source according to the video feature amount (APL in this case) of the input video signal in units of one frame.
- the brightness control table 15 is stored in the table storage memory 16 such as a ROM in advance.
- the luminance control table 15 to be used is read out according to the APL in which the input video signal power to be displayed is also detected, and the backlight Controls the brightness of the light unit 8's knock light source. This reduces the power consumption of the knocklight while maintaining the display quality of the displayed image (brightness, contrast, merino, feeling of sensation, etc.).
- the backlight unit 8's knock light is always kept constant regardless of the detected APL of the input video signal power to be displayed. Controls the brightness of the light source.
- the brightness control of the knock light source with respect to the feature quantity of the video signal is performed in an input mode that gives the viewer a feeling of strangeness. It is possible to stop and maintain the display quality of the displayed image.
- the backlash for the feature amount of the video signal When the brightness control of the light source is stopped, for example, a fixed brightness control value stored in the microcomputer 14 or the table storage memory 16 is used.
- the signal indicating the input mode output from the input mode control unit 3 in FIG. 1 is input to the microcomputer 14, and the microcomputer 14 is based on the signal indicating the input mode input! / Perform backlight brightness control for signal features Control Z stop
- the microcomputer 14 determines that it is a TV video input mode for inputting a television video signal (video signal)
- the microcomputer 14 executes luminance control of the backlight light source with respect to the feature amount of the video signal.
- the microcomputer 14 determines that a PC input mode or a game input mode other than the TV video input mode for inputting a television video signal (video signal) is selected, Stops the brightness control of the backlight source, and executes a process to keep the brightness of the backlight source constant regardless of the input video signal feature.
- the input mode in which the brightness control of the knock light source with respect to the feature amount of the video signal should be stopped mainly includes still images such as the electronic book input mode. It is possible to apply an input mode that inputs a video signal. Even in this example, even when the brightness control of the knock light source with respect to the feature quantity of the video signal is stopped, the light source emission brightness can be changed by factors other than the video feature quantity (for example, brightness sensor, user operation, etc.). It does n’t stop.
- FIG. 5 is a diagram showing an example of the backlight brightness control characteristic using the brightness control table, which is applied when executing the brightness control of the backlight light source with respect to the feature amount of the video signal.
- the horizontal axis represents APL as a percentage. When the display image is all black on the entire screen, APL is 0%, and when it is all white, APL is 100%.
- the vertical axis represents the emission luminance ratio of the backlight light source, which is 100% when the emission luminance of the knock light source is the brightest and 0% when the backlight light source is turned off.
- the luminance control characteristics shown in FIGS. 5 (A) and 5 (B) are such that the APL indicated by A is a low signal region, the signal region indicated by B, the APL being an intermediate level, and the APL indicated by D is This indicates that the brightness control characteristic of the knock light source for APL is changed according to the high signal area.
- the point at which the slope of the brightness control characteristic of the knocklight light source changes with respect to the feature quantity of the video signal (APL in this example) is defined as the characteristic change point.
- the intersections pi, p2, and p3 of the straight lines in the four regions A to D are the characteristic change points.
- the characteristic change point pi that exists on the lowest APL side is the characteristic that exists on the highest APL side when the APL is 10%.
- Change point p3 is set to the position where APL is 90%.
- the characteristic change point p2 is set at the position where APL is 40%.
- the characteristic change point pi with an APL of 10% is set as the characteristic change point at which the emission intensity of the knocklight light source is maximized.
- the emission luminance of the backlight light source in the video feature amount is extremely small, the signal region is extremely large, or the signal region is shifted or both. It is characterized by low power consumption and low power consumption while maintaining image quality. As long as these characteristics can be satisfied, the luminance control characteristics are not limited to the above example. For example, as shown in FIG. 5B, there may be a signal region q in which the emission luminance value of the knock light source is constant in the signal region where the APL is larger than the characteristic change point pi on the lowest APL side.
- the luminance control characteristic may be not only linear as described above but also a non-linear characteristic.
- the linear brightness control characteristic is approximated by approximating the nonlinear brightness control characteristic to the linear brightness control characteristic and assuming the characteristic change point in the approximated linear brightness control characteristic.
- the brightness control of the backlight source can be specified. Furthermore, as the APL becomes smaller, the light emission luminance of the backlight light source is reduced to control the light emission luminance, and by increasing the amplitude of the video signal, the black float is suppressed and the contrast is improved. Also good.
- FIG. 6 is a diagram showing an example of backlight luminance control characteristics using a fixed value applied when the luminance control of the backlight light source is stopped with respect to the feature amount of the video signal.
- the way to draw the graph in Fig. 6 is the same as in Fig. 5.
- a fixed value is used for the brightness control. Therefore, the brightness control characteristics all have the same level for the areas A to D in FIG. By setting the same level regardless of the APL value, the brightness control of the backlight source for the feature amount of the video signal is stopped. It is.
- APL is used as the video feature amount of the input video signal, and the light emission luminance of the backlight is controlled according to the APL.
- the video feature amount is not limited to the APL.
- the peak luminance state (presence or absence) of one frame of the input video signal may be used.
- the video feature value of the input video signal the maximum luminance level, the minimum luminance level, and the luminance distribution state (histogram) in a predetermined area (period) in one frame are used, or the video features obtained by combining these Based on the amount, the backlight brightness should be variably controlled.
- the luminance conversion control as described above is not limited to a direct-view type liquid crystal display device having a backlight unit as shown in FIG. 3 or FIG. 4, but also a projection type display device such as a liquid crystal projector. It can also be applied to.
- the back side force of the liquid crystal panel is also irradiated with the light source light to display an image, and the light emission luminance of the light source light may be controlled in accordance with the above luminance control characteristics.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/093,804 US20090268105A1 (en) | 2006-02-08 | 2007-02-05 | Liquid crystal display device |
CN200780002022XA CN101371291B (zh) | 2006-02-08 | 2007-02-05 | 液晶显示装置 |
EP07708021A EP1983506A4 (en) | 2006-02-08 | 2007-02-05 | LIQUID CRYSTAL DISPLAY DEVICE |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-031722 | 2006-02-08 | ||
JP2006031722 | 2006-02-08 | ||
JP2007-019519 | 2007-01-30 | ||
JP2007019519A JP4030573B2 (ja) | 2006-02-08 | 2007-01-30 | 液晶表示装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007091508A1 true WO2007091508A1 (ja) | 2007-08-16 |
Family
ID=38345108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/051903 WO2007091508A1 (ja) | 2006-02-08 | 2007-02-05 | 液晶表示装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090268105A1 (ja) |
EP (1) | EP1983506A4 (ja) |
JP (1) | JP4030573B2 (ja) |
KR (1) | KR100957876B1 (ja) |
CN (1) | CN101371291B (ja) |
TW (1) | TW200746028A (ja) |
WO (1) | WO2007091508A1 (ja) |
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WO2011125979A1 (ja) * | 2010-04-06 | 2011-10-13 | シャープ株式会社 | 表示装置 |
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US10163408B1 (en) * | 2014-09-05 | 2018-12-25 | Pixelworks, Inc. | LCD image compensation for LED backlighting |
US9483982B1 (en) * | 2015-05-05 | 2016-11-01 | Dreamscreen Llc | Apparatus and method for television backlignting |
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KR20220165566A (ko) * | 2021-06-08 | 2022-12-15 | 엘지전자 주식회사 | 디스플레이 장치 |
CN114187882A (zh) * | 2021-11-24 | 2022-03-15 | 当趣网络科技(杭州)有限公司 | 一种投影仪显示屏亮度调节的系统和方法 |
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- 2007-02-05 EP EP07708021A patent/EP1983506A4/en not_active Ceased
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JP2013061497A (ja) * | 2011-09-14 | 2013-04-04 | Sony Corp | 光源制御装置、画像表示装置及び光源制御方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101371291B (zh) | 2012-04-18 |
KR100957876B1 (ko) | 2010-05-13 |
JP4030573B2 (ja) | 2008-01-09 |
US20090268105A1 (en) | 2009-10-29 |
CN101371291A (zh) | 2009-02-18 |
EP1983506A1 (en) | 2008-10-22 |
JP2007241251A (ja) | 2007-09-20 |
TW200746028A (en) | 2007-12-16 |
EP1983506A4 (en) | 2010-08-11 |
KR20080064888A (ko) | 2008-07-09 |
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