WO2014034311A1 - Dispositif d'affichage et procédé de commande associé - Google Patents

Dispositif d'affichage et procédé de commande associé Download PDF

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Publication number
WO2014034311A1
WO2014034311A1 PCT/JP2013/069467 JP2013069467W WO2014034311A1 WO 2014034311 A1 WO2014034311 A1 WO 2014034311A1 JP 2013069467 W JP2013069467 W JP 2013069467W WO 2014034311 A1 WO2014034311 A1 WO 2014034311A1
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WIPO (PCT)
Prior art keywords
viewer
unit
screen
viewing distance
display device
Prior art date
Application number
PCT/JP2013/069467
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English (en)
Japanese (ja)
Inventor
暎 冨吉
Original Assignee
シャープ株式会社
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Publication of WO2014034311A1 publication Critical patent/WO2014034311A1/fr

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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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H05B47/125—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings by using cameras
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/14—Solving problems related to the presentation of information to be displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to a display device and a control method thereof.
  • the liquid crystal panel that displays an image requires an illumination unit on the opposite side of the display surface of the liquid crystal panel, that is, on the back side.
  • the illumination unit emits light toward a liquid crystal panel (display unit) which is an object to be irradiated, so that the liquid crystal display device can display an image on the screen.
  • positioned on the back side of the display surface of a liquid crystal panel is called the backlight unit, for example.
  • Patent Document 1 A conventional display device including a backlight unit as an illumination unit is disclosed in Patent Document 1.
  • This conventional display device captures the front of the display unit with a camera, and when a face image cannot be detected, determines that a person is not looking at the display unit and turns off the display unit or backlight. It has. Thus, even when a person is present in front of the display device, it can be determined that the person is not looking at the display unit, so that the power consumption of the display device can be reduced.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 11-242733
  • Patent Document 1 does not give consideration to adjusting the brightness of the screen in accordance with the viewing distance between the screen and the viewer.
  • a touch panel is provided on the screen of the display device or operation buttons are provided around the screen, the viewer feels very dazzled by approaching the screen for those operations, There has been a problem that there is a risk of physical problems such as eye fatigue.
  • the present invention has been made in view of the above points, and can automatically adjust the screen brightness according to the viewing distance of the viewer of the display device, and occurs when the viewer approaches the screen. It is an object of the present invention to provide a display device capable of preventing the occurrence of a failure and a control method thereof.
  • a display device of the present invention includes a display unit that displays an image on a screen, An illumination unit that irradiates the display unit with planar light, a viewer identification unit that identifies information about a viewer existing in front of the screen, and a viewer that is identified by the viewer identification unit A viewing distance estimation unit that estimates a viewing distance between the screen and the viewer based on information; and the brightness of the screen when the viewing distance estimated by the viewing distance estimation unit is equal to or less than a predetermined distance. And a screen adjustment unit that lowers the brightness of the conventional screen.
  • the display device identifies the viewer existing in front of the screen, and estimates the viewing distance between the screen and the viewer.
  • the display device reduces the brightness of the screen from the previous brightness when the viewing distance is equal to or less than the predetermined distance. That is, the display device automatically adjusts the screen brightness in accordance with the viewing distance of the viewer.
  • predetermined distance is an arbitrary distance related to the viewing distance set in advance for switching the brightness of the screen, and may be arbitrarily set according to the size of the screen, for example.
  • the screen adjustment unit controls the illumination unit when the viewing distance is equal to or less than a predetermined distance, thereby reducing the luminance of the planar light from the conventional luminance. It is characterized by comprising an illumination control unit that reduces the brightness.
  • the display device reduces the brightness of the screen by reducing the brightness of the planar light of the illumination unit from the previous brightness. In this way, the display device automatically adjusts the screen brightness in accordance with the viewing distance of the viewer.
  • the screen adjustment unit controls the display unit when the viewing distance is equal to or less than a predetermined distance to reduce the brightness of the image itself from the previous brightness, thereby increasing the brightness of the screen. It is characterized by comprising a display control unit for reducing the height.
  • the display device reduces the brightness of the screen by lowering the brightness of the image of the display unit from the previous brightness. In this way, the display device automatically adjusts the screen brightness in accordance with the viewing distance of the viewer.
  • the viewer identification unit is directed to the front of the screen to capture an image of the viewer, and from the image captured by the imaging unit, the viewer's body
  • a viewer part detecting unit for detecting a part wherein the viewing distance estimating unit estimates the viewing distance based on a size of a part of the body of the viewer detected by the viewer part detecting unit. It is said.
  • the display device identifies information related to the viewer existing in front of the screen by detecting the body part of the viewer from the image captured by the imaging unit. Then, the display device estimates the viewing distance based on the detected size of the body part of the viewer.
  • the viewer part detection unit detects left and right eyes of the viewer and an interval between the viewers
  • the viewing distance estimation unit detects the viewer left and right of the viewer detected by the viewer part detection unit. The viewing distance is estimated based on the interval between the eyes.
  • the display device estimates the viewing distance based on the distance between the left and right eyes of the viewer. In this way, the display device estimates the viewing distance based on the detected size of the body part of the viewer.
  • the viewer identification unit includes a viewer presence / absence detection unit that detects presence / absence of the viewer in front of the screen, and the viewing distance estimation unit is detected by the viewer presence / absence detection unit. The viewing distance is estimated based on the viewer's positional information.
  • the display device identifies information related to a viewer existing in front of the screen using a viewer presence / absence detection unit such as a human sensor. Then, the display device estimates the viewing distance based on the detected position information of the viewer.
  • the viewer presence / absence detecting unit includes a capacitive touch panel.
  • the display device when the display device includes a touch panel on the screen, the display device identifies information relating to the viewer existing in front of the screen using the touch panel. Therefore, the display device more easily estimates the viewing distance using the touch panel.
  • the present invention provides a control method for a display device that displays an image on a screen of the display unit by irradiating the display unit with planar light from the illumination unit.
  • a viewer identification step for identifying information related to a viewer existing in front of the screen;
  • a viewing distance estimation step for estimating a viewing distance between the screen and the viewer based on the information related to the viewer;
  • a screen adjustment step of reducing the brightness of the screen from the previous brightness when the viewing distance is equal to or less than a predetermined distance.
  • the display device identifies the viewer existing in front of the screen, and estimates the viewing distance between the screen and the viewer.
  • the display device reduces the brightness of the screen from the previous brightness when the viewing distance is equal to or less than the predetermined distance. That is, the display device automatically adjusts the screen brightness in accordance with the viewing distance of the viewer.
  • the viewer identification step includes an imaging step for capturing an image of the viewer, and a viewing for detecting a part of the viewer's body from the image captured at the imaging step.
  • a viewer part detecting step wherein the viewing distance estimating step estimates the viewing distance based on the size of the body part of the viewer detected in the viewer part detecting step.
  • the display device identifies information related to the viewer existing in front of the screen by detecting the body part of the viewer from the image captured by the imaging unit. Then, the display device estimates the viewing distance based on the detected size of the body part of the viewer.
  • the viewer identification step includes a viewer presence / absence detection step for detecting presence / absence of the viewer in front of the screen
  • the viewing distance estimation step includes the viewer presence / absence detection step. The viewing distance is estimated based on the position information of the viewer detected in the step.
  • the display device identifies information related to the viewer existing in front of the screen using a viewer presence / absence detector such as a human sensor. Then, the display device estimates the viewing distance based on the detected position information of the viewer.
  • the brightness of the screen can be automatically adjusted according to the viewing distance of the viewer of the display device, and the occurrence of a failure that may occur when the viewer approaches the screen is prevented. It is possible to provide a display device and a control method thereof.
  • FIG. 1 is an exploded perspective view of a display device according to a first embodiment of the present invention. It is a block diagram which shows the structure of the display apparatus of 1st Embodiment of this invention. It is explanatory drawing which concerns on estimation of viewing distance of the display apparatus of 1st Embodiment of this invention. It is a flowchart which shows change control of the screen brightness of the display apparatus of 1st Embodiment of this invention. It is explanatory drawing which concerns on the change of the screen brightness of the display apparatus of 2nd Embodiment of this invention. It is explanatory drawing which concerns on estimation of viewing distance of the display apparatus of 3rd Embodiment of this invention.
  • liquid crystal display device will be described as an example of the display device of the present invention.
  • FIG. 1 is an exploded perspective view of a liquid crystal display device.
  • the upper side of FIG. 1 is the display surface side of the liquid crystal panel mentioned later, and the lower side is the back surface side of a liquid crystal panel.
  • the liquid crystal display device 1 is a display device using liquid crystal for displaying images, and has a substantially rectangular shape in a plan view extending longer in the horizontal direction than in the vertical direction. As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal panel 10 as a display unit and a backlight unit 20 as an illumination unit. The liquid crystal panel 10 and the backlight unit 20 are housed and supported in the case 2.
  • the liquid crystal panel 10 includes an active matrix substrate 11, a color filter substrate 12, and a deflection plate 13.
  • the color filter substrate 12 may be simply called a counter substrate.
  • the active matrix substrate 11 is disposed to face the color filter substrate 12 disposed on the display surface side of the liquid crystal panel 10.
  • the active matrix substrate 11 includes a switching element, a pixel electrode, and a common electrode made of TFT (Thin Film Transistor) (not shown) on a predetermined surface.
  • the pixel electrode and the common electrode are composed of, for example, a pair of comb-shaped electrodes.
  • each of the active matrix substrate 11 and the color filter substrate 12 is covered with an alignment film (not shown) capable of aligning liquid crystals in a specific direction.
  • the active matrix substrate 11 and the color filter substrate 12 are bonded together with a seal material (not shown) so that their predetermined surfaces face each other. Further, the liquid crystal is sandwiched between the active matrix substrate 11 and the color filter substrate 12 and sealed in a space surrounded by a sealing material.
  • the deflection plate 13 is affixed to each of the surfaces opposite to the predetermined surfaces of the active matrix substrate 11 and the color filter substrate 12 enclosing the liquid crystal.
  • the deflection plate 13 is a sheet that transmits only a light wave in a specific vibration direction, and is attached to each of the two deflection plates 13 in a state where the transmission axis directions of the two deflection plates 13 are shifted from each other by about 90 °.
  • the liquid crystal panel 10 having such a configuration adjusts the orientation of the liquid crystal by an electric field generated between the pixel electrode and the common electrode of the active matrix substrate 11 based on the image signal, and adjusts the transmittance of light transmitted through the liquid crystal layer. change.
  • the liquid crystal panel 10 employs, for example, the above-described lateral electric field method, and generates an electric field in parallel to the main surface of the active matrix substrate 11 so that liquid crystal molecules are aligned in a plane parallel to the main surface of the substrate. Rotate with
  • the backlight unit 20 is a device for generating backlight light (planar light) to be irradiated to the liquid crystal panel 10, and is an illumination unit adopting, for example, a direct type as an illumination method.
  • the backlight unit 20 is disposed on the back side of the liquid crystal panel 10 (downward in FIG. 1).
  • the backlight unit 20 includes an LED module 21, a diffusion plate 22, a prism sheet 23, and a lens sheet 24.
  • the LED module 21 is a device that emits light for generating backlight light, and is disposed below (on the back side of) the liquid crystal panel 10 in FIG.
  • the LED module 21 includes a plate-like substrate 25 having a substantially rectangular shape in plan view, and a plurality of LEDs 26 as light sources.
  • the LED 26 is composed of, for example, a white LED (Light Emitting Diode) that emits white light, and a plurality of LEDs 26 are arranged in a substantially grid pattern on one surface of the substrate 25.
  • the surface of the substrate 25 is divided into a plurality of areas 25a arranged vertically and horizontally, and is configured such that at least one LED 26 is included in one area 25a.
  • the light source is not limited to LEDs, and the LEDs themselves are not limited to those that emit white light.
  • the LED 26 may be configured as an LED unit in which LED chips that emit light having wavelengths of red (R), green (G), and blue (B) are gathered. Furthermore, you may add the LED chip which radiate
  • the diffusion plate 22, the prism sheet 23, and the lens sheet 24 are arranged to face the LED module 21 above the LED module 21 in FIG. 1 so as to cover the LED module 21 from the liquid crystal panel 10 side.
  • the diffuser plate 22 is disposed closest to the LED module 21 and directly receives light emitted from the LED module 21.
  • the diffusing plate 22 is disposed such that the irradiated surface of the light irradiated from the LED module 21 faces the surface of the substrate 25 where the LED 26 is disposed in substantially parallel.
  • the diffusion plate 22 receives and diffuses the light emitted from the LED 26 and spreads the light over the entire area of the liquid crystal panel 10.
  • the prism sheet 23 is provided so as to overlap the liquid crystal panel 10 side of the diffusion plate 22.
  • the prism sheets 23 are arranged in a direction in which, for example, triangular prisms extending linearly in one direction intersect in one direction within the sheet surface.
  • the prism sheet 23 deflects the radiation characteristic of light from the diffusion plate 22.
  • the lens sheet 24 is provided to overlap the prism sheet 23 on the liquid crystal panel 10 side.
  • fine particles that refract and scatter light are dispersed inside.
  • the lens sheet 24 suppresses the difference in brightness that causes unevenness in the amount of light without locally condensing from the prism sheet 23.
  • the backlight unit 20 having such a configuration illuminates the back surface of the liquid crystal panel 10 by irradiating a substantially uniform backlight light in which unevenness is suppressed in a planar shape. Since the liquid crystal panel 10 changes the transmittance of the backlight that transmits the liquid crystal based on the image signal, a desired image is displayed on the screen 10a of the liquid crystal panel 10.
  • FIG. 2 is a block diagram showing the configuration of the liquid crystal display device 1
  • FIG. 3 is an explanatory diagram relating to estimation of the viewing distance of the liquid crystal display device 1.
  • the liquid crystal display device 1 includes, as control components, an image signal acquisition unit 3, an image signal processing unit 30, a liquid crystal panel control unit 4 that is a display control unit, a liquid crystal driver 5, and an LED control that is an illumination control unit.
  • the unit 6 and the LED driver 7 are provided.
  • the image signal acquisition unit 3 includes an external input interface that acquires an image signal transmitted by an image signal output unit (not shown).
  • the image signal acquisition unit 3 transmits the acquired image signal to the image signal processing unit 30.
  • the image signal is processed by the image signal processing unit 30 and then the LCD signal for specifying the display image transmitted to the liquid crystal panel control unit 4 and the luminance of the planar light transmitted to the LED control unit 6 are displayed.
  • the image signal processing unit 30 receives an image signal from the image signal acquisition unit 3. Based on the received image signal, the image signal processing unit 30 sets an LCD signal for specifying a display image by setting the light transmittance of each pixel of the liquid crystal panel 10 and the light emission luminance of each LED 26 of the backlight unit 20. And an LED signal for specifying the brightness of the entire planar light. Then, the image signal processing unit 30 transmits the LCD signal to the liquid crystal panel control unit 4 and transmits the LED signal to the LED control unit 6. The other detailed configuration of the image signal processing unit 30 will be described later.
  • the liquid crystal panel control unit 4 receives the LCD signal from the image signal processing unit 30.
  • the liquid crystal panel control unit 4 generates an LCD control signal for driving the liquid crystal driver 5 based on the received LCD signal, and transmits the LCD control signal to the liquid crystal driver 5.
  • the liquid crystal driver 5 switches the state of the switching element of each pixel of the liquid crystal panel 10 based on the LCD control signal received from the liquid crystal panel control unit 4.
  • the LED control unit 6 receives an LED signal from the image signal processing unit 30.
  • the LED control unit 6 generates an LED control signal (including a PWM control signal) for driving the LED driver 7 based on the received LED signal, and transmits the LED control signal to the LED driver 7.
  • the LED driver 7 performs light emission control (PWM control) of each LED 26 of the backlight unit 20 based on the LED control signal received from the LED control unit 6.
  • the liquid crystal display device 1 reduces the brightness of the screen 10a from the previous brightness when the viewing distance between the screen 10a of the liquid crystal panel 10 and the viewer is equal to or less than a predetermined distance.
  • the liquid crystal display device 1 includes a viewer identification unit 40, a viewing distance estimation unit 31, and a screen adjustment unit 50 as shown in FIG.
  • the viewer identification unit 40 includes a camera 41 that is an imaging unit and a face detection unit 42 that is a viewer part detection unit.
  • the liquid crystal panel control unit 4 that is the above-described display control unit or the LED control unit 6 that is the illumination control unit functions as the screen adjustment unit 50.
  • the face detection unit 42 and the viewing distance estimation unit 31 are provided in the image signal processing unit 30, but they may be configured separately from the image signal processing unit 30.
  • the camera 41 is arranged facing the front of the screen 10a of the liquid crystal panel 10 and shoots an image of the viewer.
  • the camera 41 transmits the captured image data of the viewer to the face detection unit 42.
  • the face detection unit 42 detects the information of the face part from the image data of the viewer taken by the camera 41 like a region At surrounded by a two-dot chain line in FIG. Then, the face detection unit 42 transmits information on the detected face portion of the viewer to the viewing distance estimation unit 31.
  • the viewing distance estimation unit 31 estimates the viewing distance based on the size of the individual face portion of the viewer detected by the face detection unit 42.
  • a memory (not shown) stores in advance information relating to the face portion area As (area surrounded by a broken line in FIG. 3) when the viewing distance is a predetermined distance.
  • the viewing distance estimation unit 31 compares the size of the face portion area As when the viewing distance stored in advance in the memory is a predetermined distance with the size of the viewer face portion area At photographed by the camera 41. It is determined whether the distance is equal to or less than a predetermined distance.
  • the liquid crystal panel control unit 4 or the LED control unit 6 that functions as the screen adjustment unit 50 reduces the brightness of the screen 10a from the previous brightness when the viewing distance estimated by the viewing distance estimation unit 31 is equal to or less than a predetermined distance.
  • the LED control unit 6 controls the backlight unit 20 to reduce the brightness of the screen 10a by reducing the brightness of the planar light from the previous brightness. A method of controlling the brightness of the screen 10a using the liquid crystal panel control unit 4 will be described in a later embodiment.
  • FIG. 4 is a flowchart showing control for changing the screen brightness of the liquid crystal display device 1.
  • the liquid crystal display device 1 controls the image signal processing unit 30, the liquid crystal panel 10, and the backlight unit 20 to acquire the image acquired by the image signal acquisition unit 3. Is displayed on the screen 10a, and photographing of the viewer's image is started using the camera 41 (step # 101 in FIG. 4).
  • the liquid crystal display device 1 detects the information of the face portion from the image data of the viewer photographed by the camera 41 using the face detection unit 42 (step # 102). Subsequently, the viewing distance estimation unit 31 estimates the viewing distance based on the size of the individual face portion of the viewer detected by the face detection unit 42 (step # 103).
  • the viewing distance estimation unit 31 determines whether or not the viewing distance is equal to or less than a predetermined distance (step # 104). When the viewing distance is not less than the predetermined distance (No in Step # 104), the brightness of the screen 10a is set as usual (Step # 105). Then, the process returns to step # 101, and the photographing of the viewer's image using the camera 41 is continued.
  • step # 104 when the viewing distance is equal to or smaller than the predetermined distance (Yes in step # 104), the LED control unit 6 controls the backlight unit 20 to reduce the brightness of the planar light from the previous brightness, thereby causing the screen 10a to be displayed. The brightness is lowered than usual (step # 106). Then, the process returns to step # 101, and the photographing of the viewer's image using the camera 41 is continued.
  • the liquid crystal display device 1 includes the viewer identification unit 40 that identifies information related to the viewer existing in front of the screen 10a, and the screen 10a and the viewer based on the information related to the viewer.
  • a viewing distance estimation unit 31 that estimates the viewing distance
  • a screen adjustment unit 50 that reduces the brightness of the screen 10a from the previous brightness when the viewing distance is equal to or less than a predetermined distance.
  • the liquid crystal display device 1 identifies the viewer existing in front of the screen 10a, and estimates the viewing distance between the screen 10a and the viewer. Then, the liquid crystal display device 1 lowers the brightness of the screen 10a from the previous brightness when the viewing distance is equal to or less than the predetermined distance. That is, the liquid crystal display device 1 can automatically adjust the brightness of the screen 10a in accordance with the viewing distance of the viewer.
  • the screen adjustment unit 50 controls the backlight unit 20 when the viewing distance is equal to or less than a predetermined distance to reduce the brightness of the screen 10a by reducing the brightness of the planar light from the previous brightness. It consists of six. Therefore, the liquid crystal display device 1 can automatically adjust the brightness of the screen 10a in accordance with the viewing distance of the viewer by reducing the brightness of the planar light of the backlight unit 20 from the previous brightness. .
  • the viewer identification unit 40 is directed to the front of the screen 10a to capture a viewer's image, and a face detection unit that detects a face part that is a part of the viewer's body from the image captured by the camera 41. 42.
  • the viewing distance estimation unit 31 estimates the viewing distance based on the size of the face part of the viewer detected by the face detection unit 42. Therefore, the liquid crystal display device 1 can easily estimate the viewing distance based on the viewer's image taken by the camera 41, and can automatically adjust the brightness of the screen 10a according to the viewing distance. Is possible.
  • the brightness of the screen 10a can be automatically adjusted according to the viewing distance of the viewer of the liquid crystal display device 1, and the viewer approaches the screen 10a. Therefore, it is possible to provide the liquid crystal display device 1 and its control method capable of preventing the occurrence of a failure that may occur.
  • FIG. 5 is an explanatory diagram relating to a change in screen brightness of the liquid crystal display device. Since the basic configuration of this embodiment is the same as that of the first embodiment described with reference to FIGS. 1 to 4, the same components as those of the first embodiment are denoted by the same reference numerals as before. The description of the drawings and the detailed description thereof will be omitted.
  • the liquid crystal panel control unit 4 functioning as the screen adjustment unit 50 controls the liquid crystal panel 10 when the viewing distance is equal to or less than a predetermined distance, thereby reducing the luminance of the image itself.
  • the brightness of the screen 10a is lowered.
  • the relationship between the input gradation to the liquid crystal panel 10 and the brightness of the image itself is depicted by a curve in FIG.
  • a curve in FIG. For example, as in the case of the luminance of 1.0 in FIG. 5, normally up to 255 gradations with respect to the input of the white screen (red, green and blue color intensity, red: 255, green: 255, blue: 255). Use to display.
  • the liquid crystal panel control unit 4 uses the liquid crystal panel 10 up to 186 gradations in which the luminance is about 0.5, as shown by a broken line in FIG. Display an image.
  • the liquid crystal display device 1 reduces the brightness of the screen 10a by reducing the brightness of the image itself of the liquid crystal panel 10 from the previous brightness. Therefore, the liquid crystal display device 1 can automatically adjust the brightness of the screen 10a according to the viewing distance of the viewer by using the liquid crystal panel control unit 4 and the liquid crystal panel 10.
  • FIG. 6 is an explanatory diagram relating to the estimation of the viewing distance of the liquid crystal display device. Since the basic configuration of this embodiment is the same as that of the first embodiment described with reference to FIGS. 1 to 4, the same components as those of the first embodiment are denoted by the same reference numerals as before. The description of the drawings and the detailed description thereof will be omitted.
  • the face detection unit 42 which is a viewer part detection unit, detects the left and right eyes of the viewer and the distance Dt between them. Then, the viewing distance estimation unit 31 estimates the viewing distance based on the distance Dt between the left and right eyes of the viewer detected by the face detection unit 42.
  • a memory (not shown), information related to the distance Ds between the left and right eyes of the viewer when the viewing distance is a predetermined distance (interval between arrows on the left side in FIG. 6) is stored in advance.
  • the viewing distance estimation unit 31 compares the distance Ds between the left and right eyes when the viewing distance stored in advance in the memory is a predetermined distance and the distance Dt between the left and right eyes of the viewer photographed by the camera 41 to determine the viewing distance. It is determined whether or not the distance is equal to or less than a predetermined distance.
  • the liquid crystal display device 1 can easily estimate the viewing distance from the viewer's image taken by the camera 41 based on the size of the part of the viewer's body. Therefore, it is possible to automatically adjust the brightness of the screen 10a in accordance with the viewing distance.
  • FIGS. 7 is a block diagram showing the configuration of the liquid crystal display device
  • FIG. 8 is an explanatory diagram relating to estimation of the viewing distance of the liquid crystal display device
  • FIG. 9 is a table showing the detection mode of the touch panel of the liquid crystal display device
  • FIG. It is a flowchart which shows change control of the screen brightness of. Since the basic configuration of this embodiment is the same as that of the first to third embodiments described above, the same components as those of the above embodiments are denoted by the same reference numerals as those in the previous drawings. Description and detailed description thereof will be omitted.
  • the liquid crystal display device 1 includes a touch panel 61 and a touch panel signal processing unit 62 as shown in FIG.
  • the touch panel 61 is an electrostatic capacity type, and is arranged on the screen 10a of the liquid crystal panel 10 as drawn by a broken line in FIG.
  • the liquid crystal panel 10 can display items such as inputs, settings, and instructions on the screen 10a using liquid crystal. Selection of the items and keys displayed on the screen 10a when the viewer touches the touch panel 61 with a finger or the like. Accepts input.
  • the touch panel signal processing unit 62 detects contact of the user's finger or the like with respect to the touch panel 61. Information obtained by the touch panel signal processing unit 62 from the touch panel 61, that is, information on key input by the viewer to the touch panel 61 is transmitted to a main control unit (not shown).
  • the liquid crystal display device 1 uses a touch panel 61 that functions as a viewer presence / absence detection unit that detects the presence / absence of a viewer in front of the screen 10a in the viewer identification unit 40. For this reason, as shown in FIG. 9, the liquid crystal display device 1 uses the touch panel 61 in two modes: a first mode for detecting the presence of a viewer and a second mode for detecting the coordinates of a normal approaching finger. Make it work.
  • the touch panel 61 increases the sensing gain so that it can sense the change in capacity sensitively and detects the approach of the viewer.
  • the sensing frequency is made smaller than usual, and the sensing area is made narrower than usual.
  • the sensing frequency is set to 10 Hz or the like in the first mode, for example, while the normal second mode is 100 Hz or the like.
  • the sensing area is set to a partial area 61a on the lower side in the first mode, while the normal second mode is the entire screen 10a.
  • the viewing distance estimation unit 63 estimates the viewing distance based on the viewer position information detected by the touch panel 61.
  • the liquid crystal display device 1 When driving of the liquid crystal display device 1 is started (start of FIG. 10), the liquid crystal display device 1 sets the brightness of the screen 10a as usual and displays the image acquired by the image signal acquisition unit 3 on the screen 10a. At the same time, the touch panel 61 is operated in the first mode to start the viewer detection (step # 201 in FIG. 10).
  • the viewing distance estimation unit 63 estimates the viewing distance based on the position information of the viewer detected by the touch panel 61. (Step # 202).
  • the viewing distance estimation unit 63 determines whether or not the viewing distance is equal to or less than a predetermined distance (step # 203). If the viewing distance is not less than the predetermined distance (No in Step # 203), the process returns to Step # 201, and the touch panel 61 is continuously operated in the first mode to continue detecting the viewer.
  • the liquid crystal panel control unit 4 or the LED control unit 6 functioning as the screen adjustment unit 50 lowers the brightness of the screen 10a from the normal level, and touches the touch panel. 61 is operated in the second mode to detect the coordinates of the finger of the viewer (step # 204). Until the touch panel 61 is not operated for a predetermined time set in advance, the brightness of the screen 10a is decreased from the normal level and the state in which the touch panel 61 is operated in the second mode is continued (No in step # 205).
  • Step # 205 If the touch panel 61 is not operated for a predetermined time (Yes in Step # 205), the touch panel 61 is operated in the first mode while the brightness of the screen 10a is lowered than usual, and the viewer's Detection is started (step # 206). Then, returning to step # 202, the viewing distance estimation unit 63 estimates the viewing distance based on the position information of the viewer detected by the touch panel 61.
  • the viewer identification unit 40 includes the touch panel 61 that detects the presence or absence of a viewer in front of the screen 10a, and the viewing distance estimation unit 63 determines the viewing distance based on the viewer position information detected by the touch panel 61.
  • the liquid crystal display device 1 can identify information relating to a viewer existing in front of the screen 10a using the touch panel 61 functioning as a human sensor. Therefore, the liquid crystal display device 1 can more easily estimate the viewing distance using the touch panel 61.
  • the face detection unit 42 that detects the face part is used as the viewer part detection unit that detects the part of the viewer's body from the image captured by the camera 41.
  • the part is not limited to the face, but may be another part.
  • the touch panel 61 is used as the viewer presence / absence detection unit that detects the presence / absence of the viewer in front of the screen 10a.
  • the viewer presence / absence detection unit is not limited to the touch panel.
  • the viewer presence / absence detection unit may detect the presence / absence of the viewer using a sensor or a detector of another method such as an infrared sensor or an ultrasonic sensor.
  • the present invention can be used in a display device and its control method.
  • Liquid crystal display device (display device) 4 LCD panel controller (display controller) 6 LED controller (lighting controller) 10 Liquid crystal panel (display unit) 10a Screen 20 Backlight unit (lighting unit) 30 Image signal processing unit 31, 63 Viewing distance estimation unit 40 Viewer identification unit 41 Camera (imaging unit) 42 Face detection unit (viewer part detection unit) 50 Screen adjustment unit 61 Touch panel (viewer presence / absence detection unit) 62 Touch panel signal processor

Abstract

L'invention concerne un dispositif d'affichage permettant d'ajuster automatiquement la luminosité de l'écran en réponse à la distance d'observation de l'observateur et de prévenir les entraves pouvant survenir lorsque l'observateur s'approche de l'écran. Ce dispositif d'affichage à cristaux liquides (1) comprend : un panneau à cristaux liquides (10) permettant d'afficher une image sur un écran (10a); une unité de rétroéclairage (20) permettant d'émettre une lumière plane vers le panneau à cristaux liquides (10); une unité d'identification d'observateur (40) permettant d'identifier les informations relatives à un observateur présent devant l'écran (10a); une unité d'estimation de distance d'observation (31) permettant d'estimer la distance d'observation entre l'écran (10a) et l'observateur d'après les informations relatives à l'observateur identifié par l'unité d'identification d'observateur (40); et une unité d'ajustement d'écran (50) permettant d'amener la luminosité de l'écran (10a) à un niveau inférieur à la luminosité précédente si la distance d'observation estimée par l'unité d'estimation de distance d'observation (31) est égale ou inférieure à une distance prédéterminée.
PCT/JP2013/069467 2012-08-30 2013-07-18 Dispositif d'affichage et procédé de commande associé WO2014034311A1 (fr)

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JP2012-190287 2012-08-30
JP2012190287A JP2015200682A (ja) 2012-08-30 2012-08-30 表示装置及びその制御方法

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