WO2012086269A1 - Display device and display system - Google Patents

Display device and display system Download PDF

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Publication number
WO2012086269A1
WO2012086269A1 PCT/JP2011/070015 JP2011070015W WO2012086269A1 WO 2012086269 A1 WO2012086269 A1 WO 2012086269A1 JP 2011070015 W JP2011070015 W JP 2011070015W WO 2012086269 A1 WO2012086269 A1 WO 2012086269A1
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illuminance
luminance
unit
output
person
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PCT/JP2011/070015
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French (fr)
Japanese (ja)
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北森　豊
智功 吉田
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三洋電機株式会社
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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
    • G09G3/3406—Control of illumination source
    • 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
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13324—Circuits comprising solar cells
    • 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
    • G02F1/133612—Electrical details
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/06—Remotely controlled electronic signs other than labels
    • 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

Definitions

  • the present invention relates to a display device and a display system using a human sensor, particularly an infrared human sensor.
  • Patent Document 1 In recent years, digital signage, which displays advertising content, messages, etc. on a display or the like placed outdoors or in public facilities, has appeared. Such advertising displays are used for bus stops, for example (Patent Document 1).
  • Infrared-type human sensor employs a mechanism that detects temperature changes when an object that has a temperature difference with the surrounding temperature moves within the sensing area. Therefore, in the infrared type human sensor, even if a person appears when direct sunlight is applied, the temperature change in the sensor is small, so that it may be erroneously determined that there is actually no person. When it is erroneously determined that there is no person, control for lowering the display brightness is performed, and as a result, visibility may deteriorate.
  • a display device includes: A display unit; An illumination unit for illuminating the display unit; A human sensor, An estimation unit that estimates the presence or absence of a person based on the output of the human sensor; An acquisition unit for acquiring the illuminance of outside light; A control unit for controlling the output of the illumination unit, The controller is When the estimator estimates that the person is present, the illuminance acquired by the acquisition unit is changed within the first illuminance or less in accordance with the illuminance, When the estimation unit estimates that there is no person, the output of the illumination unit is controlled to be at least a predetermined luminance or more in a range where the illuminance acquired by the acquisition unit exceeds the second illuminance.
  • a display device includes: A display unit; An illumination unit for illuminating the display unit; An infrared human sensor, An estimation unit that estimates the presence or absence of a person based on the output of the infrared human sensor; An acquisition unit for acquiring the illuminance of outside light; A control unit for controlling the output of the illumination unit, When the estimation unit estimates that there is a person, the control unit increases the luminance from the first luminance to the second luminance when the illuminance is from zero to the first illuminance.
  • the control unit increases the luminance from the first luminance to the third luminance lower than the second luminance from zero to the first illuminance, and the illuminance decreases to the first illuminance.
  • Luminance acquired by the acquisition unit in the relationship between illuminance and luminance such that the luminance is constant at the third luminance up to the second illuminance, and the luminance is constant at the second luminance when the illuminance exceeds the second illuminance.
  • the output of the illuminating unit is controlled to a luminance according to the above.
  • FIG. 1 is a block diagram of an outdoor display system according to an embodiment of the present invention. It is a figure which shows an example of the relationship between the illumination intensity and backlight brightness
  • FIG. 1 shows a perspective view of an external appearance of an outdoor display system 100 according to an embodiment of the present invention when viewed from the front.
  • the outdoor display system 100 shown in FIG. 1 includes a solar cell 11, an installation table 20, and a display device 30.
  • the controller 40 and the storage battery 50 are arranged on the back side of the display device 30.
  • the solar cell 11 is installed on an installation table 20 provided above the display device 30, and generates electricity by photoelectrically converting received sunlight.
  • the electric power obtained by the solar battery 11 is stored in the storage battery 50 via the controller 40.
  • the storage battery 50 is, for example, a lithium ion battery (battery pack).
  • the display device 30 is a LCD panel including a display panel such as a liquid crystal panel (LCD) and a backlight.
  • the display device 30 displays content received from an external content server or broadcast station.
  • a touch panel 6 is provided on the front side of the display device 30, and a screen operation can be performed by touching the touch panel 6.
  • An illuminance sensor 9 and an infrared human sensor 10 are provided on the front surface of the housing of the display device 30. These sensors are used to control backlight luminance, which will be described later.
  • the display device 30 includes an antenna and can receive content wirelessly.
  • FIG. 2 is a block diagram showing the configuration of the outdoor display system 100.
  • the outdoor display system 100 includes a solar cell 11, a display device 30, a controller 40, and a storage battery 50.
  • the display device 30 includes a reception unit 1, a storage unit 2, a display control unit 3, a backlight 4, a display panel 5, a touch panel 6, a power supply circuit 7, a control unit 8, an illuminance sensor 9, And an infrared human sensor 10.
  • the controller 40 supplies the power generated by the solar cell 11 to the display device 30 and the storage battery 50.
  • the controller 40 supplies most of the power generated by the solar cell 11 to the display device 30 as it is. Then, surplus power (difference power between the power generated by the solar battery 11 and the power consumed by the display device 30) is supplied to the storage battery 50.
  • the controller 40 performs control so that power is supplied from the storage battery 50 to the display device 30. That is, the electric power stored in the storage battery 50 is supplied to the display device 30 via the controller 40.
  • the control unit 8 is constituted by, for example, a CPU, and controls each unit of the display device 30 and collects status information of each unit. Moreover, each part is controlled according to the collected state information.
  • the display panel 5 is a part that actually displays an image, and a liquid crystal display panel is used in the display device 30 of the present embodiment.
  • the liquid crystal corresponding to each pixel of the panel is driven on / off (or an intermediate state thereof) according to the content of the image to be displayed.
  • the backlight 4 irradiates the display panel 5 with white light.
  • a cold cathode fluorescent lamp (CCFL) or an LED light source is used. It is desirable to use an LED light source to reduce power consumption.
  • the touch panel 6 is a transparent capacitive touch sensor disposed on the front side of the display panel 5. This touch panel 6 receives an input from a user. For example, when the display panel 5 displays a button image for the user to select three, when the user touches a position corresponding to the button image on the touch panel 6, it is considered that an input has been made by the user.
  • the receiving unit 1 includes an antenna for receiving a signal transmitted from an external content server (for example, an ASP server, a personal computer, etc.) or a broadcasting station by wireless communication (for example, a method such as WiMAX, IEEE802.11b / g), an antenna And a signal processing unit for performing demodulation processing on the signal received by the mobile phone.
  • an external content server for example, an ASP server, a personal computer, etc.
  • a broadcasting station by wireless communication (for example, a method such as WiMAX, IEEE802.11b / g)
  • a signal processing unit for performing demodulation processing on the signal received by the mobile phone.
  • the wireless signal is an MPEG2-TS format signal that has been modulated by the OFDM method and transmitted
  • the receiver 1 performs OFDM demodulation and extracts the MPEG2-TS signal.
  • the extracted MPEG2-TS signal is output to the storage unit 2.
  • the storage unit 2 stores the content extracted by the receiving unit 1.
  • the storage unit 2 functions as a buffer memory.
  • the storage unit 2 functions as a storage medium.
  • the display control unit 3 performs display control on the display panel 5. Specifically, the liquid crystal corresponding to each pixel of the display panel 5 is modulated according to the content to be displayed. Since the display control unit 3 requires high-speed processing, the display control unit 3 is realized by a dedicated hardware circuit provided separately from the control unit 8 configured by the CPU.
  • the power supply circuit 7 supplies power to each part of the display device 30. In view of the fact that the power consumption of the display panel 5 and the backlight 4 is larger than that of the other parts, the power supply circuit 7 supplies power only to the display panel 5 and the backlight 4 in FIG. It is described as follows. However, actually, the power supply circuit 7 also supplies power to the receiving unit 1, the storage unit 2, the display control unit 3, the touch panel 6, and the like.
  • the illuminance sensor 9 outputs an illuminance detection signal to the control unit 8 when it receives external light (sunlight).
  • the control unit 8 can acquire illuminance information by A / D converting the illuminance detection signal from the illuminance sensor 9.
  • the infrared human sensor 10 has, for example, a pyroelectric infrared sensor and a Fresnel lens, and outputs a voltage signal corresponding to a temperature change generated by receiving infrared light.
  • This system has two backlight luminance control modes, a normal luminance control mode and an energy saving luminance control mode.
  • the normal luminance control mode is employed when a person is in front of the display device 30. In this mode, the luminance of the backlight 4 is controlled according to the illuminance based on the relationship shown in the graph of FIG.
  • the energy saving luminance control mode is employed when a person is not in front of the display device 30 and is a mode for reducing power consumption by suppressing the luminance of the backlight 4. In this mode, the luminance of the backlight 4 is controlled according to the illuminance based on the relationship shown in the graph of FIG.
  • step S ⁇ b> 1 the control unit 8 determines whether there is a person in front of the display device 30 for a predetermined time based on the output of the infrared human sensor 10.
  • step S1 If the control unit 8 determines that a person has appeared in front of the display device 30 within a predetermined time (N in step S1), the process proceeds to step S2, and the control unit 8 maintains the normal luminance control mode. And it progresses to step S3 and the control part 8 acquires illumination intensity information based on the output of the illumination intensity sensor 9.
  • step S2 If the control unit 8 determines that a person has appeared in front of the display device 30 within a predetermined time (N in step S1), the process proceeds to step S2, and the control unit 8 maintains the normal luminance control mode. And it progresses to step S3 and the control part 8 acquires illumination intensity information based on the output of the illumination intensity sensor 9.
  • step S4 the control unit 8 controls the luminance of the backlight 4 to the luminance according to the acquired illuminance information in the normal luminance control mode.
  • the normal luminance control mode the relationship between the illuminance and the backlight luminance shown in FIG. 3 is used.
  • the backlight luminance increases linearly from 20% to 100%, and when it exceeds 5000 lux, the backlight luminance is constant at 100%.
  • the control unit 8 determines the backlight luminance according to the acquired illuminance information in such a relationship (for example, 100% if the acquired illuminance is 6000 lux), and the luminance of the backlight 4 so that the determined luminance is obtained.
  • the value of 5000 lux in FIG. 3 is an example, and the value is not limited to this.
  • the portion where the backlight luminance increases linearly is not limited linearly, and may increase, for example, as a quadratic curve.
  • the luminance of the backlight 4 is controlled to 100% when the illuminance is high, so that the visibility of the display device 30 can be improved.
  • step S1 determines that the control unit 8 has no person for a certain period of time (Y in step S1), there is no problem even if the visibility is lowered, so the process proceeds to step S5. Transition to control mode. And it progresses to step S6 and the control part 8 acquires illumination intensity information based on the output of the illumination intensity sensor 9.
  • the control unit 8 controls the luminance of the backlight 4 to the luminance according to the acquired illuminance information in the energy saving luminance control mode.
  • the energy saving luminance control mode the relationship between the illuminance and the backlight luminance shown in FIG. 4 is used.
  • the backlight brightness increases linearly from 20% to 60% when the illuminance is from 0 lux to 5000 lux, and the backlight brightness is constant at 60% from 5,000 lux to 10,000 lux. Become. Furthermore, if it exceeds 10,000 lux, the backlight luminance becomes constant at 100%. 10,000 lux is the illuminance level when direct sunlight is applied.
  • the control unit 8 determines the backlight luminance according to the acquired illuminance information in such a relationship (for example, 60% if the acquired illuminance is 6000 lux), and the luminance of the backlight 4 so that the determined luminance is obtained.
  • a relationship for example, 60% if the acquired illuminance is 6000 lux
  • the luminance of the backlight 4 so that the determined luminance is obtained.
  • the values of 5000 lux and 10000 lux in FIG. 4 are merely examples, and the present invention is not limited to this, and the portion where the backlight luminance increases linearly is not limited linearly, but increases, for example, as a quadratic curve. Also good.
  • the luminance of the backlight 4 is controlled to 60% at the maximum, so that low power consumption can be achieved.
  • the backlight luminance is set to 100% at an illuminance of 10,000 lux or more corresponding to the level that is exposed to direct sunlight. Yes. That is, when the illuminance is high, the backlight luminance is set to a constant value (and a high value) regardless of the detection result of the infrared human sensor 10.
  • the backlight luminance increases monotonically from 0 to 5000 lux, and the backlight from 5000 to 10000 lux.
  • the backlight may be turned off from 0 to 10,000 lux, and the backlight may be turned on only when the luminance exceeds 10,000 lux.
  • the backlight luminance may be set to the first luminance (for example, 20%) from 0 to 10,000 lux, and the backlight luminance may be set to 100% when exceeding 10,000 lux.
  • the backlight luminance may not be monotonously increased but may be constant luminance (for example, 20%).
  • the backlight luminance when the luminance exceeds 5000 lux, the backlight luminance is set to 100%, and in FIG. 4, the luminance is also set to 60% when exceeding 5000 lux.
  • the luminance threshold value may be different between FIG. 3 and FIG.
  • the backlight brightness is set to 100% when it exceeds 5000 lux, but the backlight brightness may be set to 100% when it exceeds 10000 lux. That is, the illuminance threshold value at which the backlight luminance is 100% may be the same in FIGS.
  • the backlight luminance is constant at 100% when it exceeds 5000 lux.
  • the backlight luminance is not necessarily 100%, and may be constant at 80%, for example.
  • the backlight luminance is reduced from 100% to 80% when the charge amount of the storage battery 50 is small. Thereby, the ratio which charges to the storage battery 50 can be increased (with respect to the ratio supplied to the display apparatus 30), and it can prepare for the arrival of the night or rainy weather.
  • the display device 30 is not limited to a liquid crystal display device, and the present invention can also be applied to a self-luminous display device such as a plasma display or an organic EL display.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

In the case where it is determined on the basis of output from an infrared human sensor (10) that there is no human, luminance of a backlight (4) is controlled to 100 % backlight luminance when illuminance obtained on the basis of output from an illuminance sensor (9) exceeds the illuminance level of the direct sunlight.

Description

表示装置および表示システムDisplay device and display system
　本発明は、人感センサ、特に赤外線型人感センサを用いた表示装置および表示システムに関する。 The present invention relates to a display device and a display system using a human sensor, particularly an infrared human sensor.
　近年、デジタルサイネージと呼ばれ、屋外や公共施設に配置されるディスプレイ等に広告コンテンツやメッセージ等を表示するものが登場している。このような広告用のディスプレイは、例えばバス停等に用いられている（特許文献１）。 In recent years, digital signage, which displays advertising content, messages, etc. on a display or the like placed outdoors or in public facilities, has appeared. Such advertising displays are used for bus stops, for example (Patent Document 1).
特開２００９－２９４２８４号公報（第３図）JP 2009-294284 A (FIG. 3)
　屋外に広告用のディスプレイを設置する場合、低消費電力化を図るため、赤外線型人感センサ等を用い、人がいないときに表示輝度を下げたりする制御を行うことが考えられる。 When installing an advertising display outdoors, in order to reduce power consumption, it is conceivable to use an infrared human sensor or the like to control the display brightness when there is no person.
　赤外線型人感センサでは、周りの温度と温度差のあるものが感知エリア内で動いたときに、その温度変化を検知する仕組みを採用している。従って、赤外線型人感センサでは、直射日光が照射されているときに人が現れても当該センサにおける温度変化が少ないので、実際は人がいるのに人がいないと誤判断される場合がある。人がいないと誤判断された場合、表示輝度を下げる制御が行われ、その結果、視認性が悪化する場合がある。 Infrared-type human sensor employs a mechanism that detects temperature changes when an object that has a temperature difference with the surrounding temperature moves within the sensing area. Therefore, in the infrared type human sensor, even if a person appears when direct sunlight is applied, the temperature change in the sensor is small, so that it may be erroneously determined that there is actually no person. When it is erroneously determined that there is no person, control for lowering the display brightness is performed, and as a result, visibility may deteriorate.
　本発明の或る態様に係る表示装置は、
　表示部と、
　前記表示部を照明する照明部と、
　人感センサと、
　前記人感センサの出力に基づき人物の有無を推定する推定部と、
　外光の照度を取得する取得部と、
　前記照明部の出力を制御する制御部と、を備え、
　前記制御部は、
　前記推定部が人物有と推定した場合、前記取得部が取得した照度が第１照度以下の範囲においては該照度に応じて前記照明部の出力を変化させ、
　前記推定部が人物無と推定した場合、前記取得部が取得した照度が第２照度を超える範囲においては前記照明部の出力が少なくとも所定の輝度以上となるように制御することを特徴とする。 A display device according to an aspect of the present invention includes:
A display unit;
An illumination unit for illuminating the display unit;
A human sensor,
An estimation unit that estimates the presence or absence of a person based on the output of the human sensor;
An acquisition unit for acquiring the illuminance of outside light;
A control unit for controlling the output of the illumination unit,
The controller is
When the estimator estimates that the person is present, the illuminance acquired by the acquisition unit is changed within the first illuminance or less in accordance with the illuminance,
When the estimation unit estimates that there is no person, the output of the illumination unit is controlled to be at least a predetermined luminance or more in a range where the illuminance acquired by the acquisition unit exceeds the second illuminance.
　また、本発明の他の態様に係る表示装置は、
　表示部と、
　前記表示部を照明する照明部と、
　赤外線型人感センサと、
　前記赤外線型人感センサの出力に基づき人物の有無を推定する推定部と、
　外光の照度を取得する取得部と、
　前記照明部の出力を制御する制御部と、を備え、
　前記推定部が人がいると推定した場合、前記制御部は、照度がゼロから第１照度までは輝度が第１輝度から第２輝度まで上昇し、照度が第１照度を超えると輝度が第２輝度で一定となるような照度と輝度の関係における前記取得部により取得された照度に応じた輝度に前記照明部の出力を制御し、
　前記推定部が人がいないと推定した場合、前記制御部は、照度がゼロから第１照度までは輝度が第１輝度から第２輝度より低い第３輝度まで上昇し、照度が第１照度を超えて第２照度までは輝度が第３輝度で一定であり、照度が第２照度を超えると輝度が第２輝度で一定となるような照度と輝度の関係における前記取得部により取得された照度に応じた輝度に前記照明部の出力を制御することを特徴とする。 In addition, a display device according to another aspect of the present invention includes:
A display unit;
An illumination unit for illuminating the display unit;
An infrared human sensor,
An estimation unit that estimates the presence or absence of a person based on the output of the infrared human sensor;
An acquisition unit for acquiring the illuminance of outside light;
A control unit for controlling the output of the illumination unit,
When the estimation unit estimates that there is a person, the control unit increases the luminance from the first luminance to the second luminance when the illuminance is from zero to the first illuminance. Controlling the output of the illuminating unit to a luminance according to the illuminance acquired by the acquiring unit in the relationship between the illuminance and the luminance so as to be constant at two luminances;
When the estimation unit estimates that there is no person, the control unit increases the luminance from the first luminance to the third luminance lower than the second luminance from zero to the first illuminance, and the illuminance decreases to the first illuminance. Luminance acquired by the acquisition unit in the relationship between illuminance and luminance such that the luminance is constant at the third luminance up to the second illuminance, and the luminance is constant at the second luminance when the illuminance exceeds the second illuminance. The output of the illuminating unit is controlled to a luminance according to the above.
本発明の一実施形態に係る屋外表示システムの外観を正面から見たときの斜視図である。It is a perspective view when the external appearance of the outdoor display system which concerns on one Embodiment of this invention is seen from the front. 本発明の一実施形態に係る屋外表示システムのブロック図である。1 is a block diagram of an outdoor display system according to an embodiment of the present invention. 本発明に係る通常輝度制御モードにおける照度とバックライト輝度の関係の一例を示す図である。It is a figure which shows an example of the relationship between the illumination intensity and backlight brightness | luminance in the normal brightness control mode which concerns on this invention. 本発明に係る省エネ輝度制御モードにおける照度とバックライト輝度の関係の一例を示す図である。It is a figure which shows an example of the relationship between the illumination intensity and backlight brightness | luminance in the energy saving brightness | luminance control mode which concerns on this invention. 本発明に係るバックライト輝度制御の一例に関するフローチャートである。5 is a flowchart relating to an example of backlight luminance control according to the present invention.
　以下に本発明の実施形態を図面を参照して説明する。本発明の一実施形態に係る屋外表示システム１００の外観を正面から見たときの斜視図を図１に示す。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of an external appearance of an outdoor display system 100 according to an embodiment of the present invention when viewed from the front.
　図１に示す屋外表示システム１００は、太陽電池１１と、設置台２０と、表示装置３０と、を備えている。また、屋外表示システム１００は、表示装置３０の裏面側にコントローラ４０および蓄電池５０が配される。 The outdoor display system 100 shown in FIG. 1 includes a solar cell 11, an installation table 20, and a display device 30. In the outdoor display system 100, the controller 40 and the storage battery 50 are arranged on the back side of the display device 30.
　太陽電池１１は、表示装置３０の上方に設けられる設置台２０に設置され、受光した太陽光を光電変換することにより発電を行う。太陽電池１１により得られた電力は、コントローラ４０を介して蓄電池５０に蓄えられる。蓄電池５０は、例えばリチウムイオンバッテリ（バッテリパック）である。 The solar cell 11 is installed on an installation table 20 provided above the display device 30, and generates electricity by photoelectrically converting received sunlight. The electric power obtained by the solar battery 11 is stored in the storage battery 50 via the controller 40. The storage battery 50 is, for example, a lithium ion battery (battery pack).
　表示装置３０は、液晶パネル（ＬＣＤ：Liquid　Crystal　Display）等の表示パネルおよびバックライトを備えたＬＣＤディスプレイである。表示装置３０は、外部のコンテンツサーバや放送局などから受信したコンテンツ等を表示する。また、表示装置３０の前面側にはタッチパネル６が備えられており、タッチパネル６に触れることで画面操作が可能となっている。また、表示装置３０の筐体の前面には照度センサ９と赤外線型人感センサ１０が設けられる。これらのセンサは後述するバックライト輝度の制御に用いられる。 The display device 30 is a LCD panel including a display panel such as a liquid crystal panel (LCD) and a backlight. The display device 30 displays content received from an external content server or broadcast station. Further, a touch panel 6 is provided on the front side of the display device 30, and a screen operation can be performed by touching the touch panel 6. An illuminance sensor 9 and an infrared human sensor 10 are provided on the front surface of the housing of the display device 30. These sensors are used to control backlight luminance, which will be described later.
　なお、本実施形態では、表示装置３０は、アンテナを備えており、コンテンツを無線により受信することができる。 In the present embodiment, the display device 30 includes an antenna and can receive content wirelessly.
　屋外表示システム１００の構成を示すブロック図を図２に示す。図１で既に一部説明したが、屋外表示システム１００は、太陽電池１１と、表示装置３０と、コントローラ４０と、蓄電池５０と、を備えている。表示装置３０は、受信部１と、蓄積部２と、表示制御部３と、バックライト４と、表示パネル５と、タッチパネル６と、電源回路７と、制御部８と、照度センサ９と、赤外線型人感センサ１０とを有している。 FIG. 2 is a block diagram showing the configuration of the outdoor display system 100. As already described in part with FIG. 1, the outdoor display system 100 includes a solar cell 11, a display device 30, a controller 40, and a storage battery 50. The display device 30 includes a reception unit 1, a storage unit 2, a display control unit 3, a backlight 4, a display panel 5, a touch panel 6, a power supply circuit 7, a control unit 8, an illuminance sensor 9, And an infrared human sensor 10.
　コントローラ４０は、太陽電池１１が発電した電力を表示装置３０および蓄電池５０へ供給する。原則的に、コントローラ４０は、太陽電池１１が発電した電力の大部分をそのまま表示装置３０へ供給する。そして、余剰電力（太陽電池１１による発電電力と表示装置３０の消費電力の差分電力）を蓄電池５０へ供給する。また、夜間や雨天時は、コントローラ４０は、蓄電池５０から表示装置３０へ電力供給がなされるように制御する。即ち、蓄電池５０に蓄えられた電力は、コントローラ４０経由で表示装置３０へ供給される。 The controller 40 supplies the power generated by the solar cell 11 to the display device 30 and the storage battery 50. In principle, the controller 40 supplies most of the power generated by the solar cell 11 to the display device 30 as it is. Then, surplus power (difference power between the power generated by the solar battery 11 and the power consumed by the display device 30) is supplied to the storage battery 50. In addition, at night or in the rain, the controller 40 performs control so that power is supplied from the storage battery 50 to the display device 30. That is, the electric power stored in the storage battery 50 is supplied to the display device 30 via the controller 40.
　制御部８は、例えばＣＰＵにより構成され、表示装置３０の各部に対する制御、各部の状態情報の収集を行う。また、収集した状態情報に応じて各部の制御を行う。 The control unit 8 is constituted by, for example, a CPU, and controls each unit of the display device 30 and collects status information of each unit. Moreover, each part is controlled according to the collected state information.
　表示パネル５は、実際に画像の表示を行う部分であり、本実施形態の表示装置３０では液晶表示パネルが用いられている。液晶表示パネルは、表示する画像の内容に応じてパネルの各画素に対応する液晶がオン・オフ（またはその中間状態）駆動される。 The display panel 5 is a part that actually displays an image, and a liquid crystal display panel is used in the display device 30 of the present embodiment. In the liquid crystal display panel, the liquid crystal corresponding to each pixel of the panel is driven on / off (or an intermediate state thereof) according to the content of the image to be displayed.
　バックライト４は、表示パネル５に白色光を照射する。バックライト４は、例えば冷陰極管（ＣＣＦＬ）、ＬＥＤ光源が用いられる。低消費電力化のためにはＬＥＤ光源を用いることが望ましい。 The backlight 4 irradiates the display panel 5 with white light. As the backlight 4, for example, a cold cathode fluorescent lamp (CCFL) or an LED light source is used. It is desirable to use an LED light source to reduce power consumption.
　タッチパネル６は、表示パネル５の前面側に配される透明の静電容量型のタッチセンサである。このタッチパネル６はユーザからの入力を受け付ける。例えば、表示パネル５が、ユーザに三択させるためのボタン画像を表示している場合、ユーザがタッチパネル６のボタン画像に対応する位置をタッチした場合、ユーザによる入力がなされたものとみなされる。 The touch panel 6 is a transparent capacitive touch sensor disposed on the front side of the display panel 5. This touch panel 6 receives an input from a user. For example, when the display panel 5 displays a button image for the user to select three, when the user touches a position corresponding to the button image on the touch panel 6, it is considered that an input has been made by the user.
　受信部１は、外部のコンテンツサーバ（例えば、ＡＳＰサーバ、パソコンなど）あるいは放送局から無線通信（例えば、ＷｉＭＡＸ、ＩＥＥＥ８０２．１１ｂ／ｇなどの方式）により送信される信号を受信するアンテナと、アンテナで受信した信号に対し復調処理などを行う信号処理部などを備える。例えば、無線信号がＯＦＤＭ方式により変調されて伝送されたＭＰＥＧ２－ＴＳ形式の信号であれば、受信部１はＯＦＤＭ復調を行い、ＭＰＥＧ２－ＴＳ信号を抽出する。抽出されたＭＰＥＧ２－ＴＳ信号は、蓄積部２へ出力される。 The receiving unit 1 includes an antenna for receiving a signal transmitted from an external content server (for example, an ASP server, a personal computer, etc.) or a broadcasting station by wireless communication (for example, a method such as WiMAX, IEEE802.11b / g), an antenna And a signal processing unit for performing demodulation processing on the signal received by the mobile phone. For example, if the wireless signal is an MPEG2-TS format signal that has been modulated by the OFDM method and transmitted, the receiver 1 performs OFDM demodulation and extracts the MPEG2-TS signal. The extracted MPEG2-TS signal is output to the storage unit 2.
　蓄積部２は、受信部１により抽出されたコンテンツ等を保存する。コンテンツがリアルタイムコンテンツである場合（受信したコンテンツを即時に表示パネル５で表示するような場合）、蓄積部２はバッファメモリとして機能する。コンテンツがユーザの操作に応じて表示されるコンテンツ、あるいは予め設定されたタイムスケジュールに基づいて表示されるコンテンツである場合、蓄積部２はストレージメディアとして機能する。 The storage unit 2 stores the content extracted by the receiving unit 1. When the content is real-time content (when the received content is displayed on the display panel 5 immediately), the storage unit 2 functions as a buffer memory. When the content is content displayed in response to a user operation or content displayed based on a preset time schedule, the storage unit 2 functions as a storage medium.
　表示制御部３は、表示パネル５における表示制御を行う。具体的には、表示させるコンテンツの内容に応じて、表示パネル５の各画素に対応する液晶の変調を行う。表示制御部３は高速な処理を必要とするため、ＣＰＵにより構成される制御部８とは別に設けられた専用のハードウェア回路により実現される。 The display control unit 3 performs display control on the display panel 5. Specifically, the liquid crystal corresponding to each pixel of the display panel 5 is modulated according to the content to be displayed. Since the display control unit 3 requires high-speed processing, the display control unit 3 is realized by a dedicated hardware circuit provided separately from the control unit 8 configured by the CPU.
　電源回路７は、表示装置３０の各部に対し電源供給を行う。なお、表示パネル５、バックライト４における消費電力が他の部分と比して大きいことに鑑み、図２では、電源回路７は、表示パネル５、バックライト４に対してのみ電源供給を行うがごとく記載している。しかし、実際は、電源回路７は、受信部１、蓄積部２、表示制御部３、タッチパネル６などにも電力を供給する。 The power supply circuit 7 supplies power to each part of the display device 30. In view of the fact that the power consumption of the display panel 5 and the backlight 4 is larger than that of the other parts, the power supply circuit 7 supplies power only to the display panel 5 and the backlight 4 in FIG. It is described as follows. However, actually, the power supply circuit 7 also supplies power to the receiving unit 1, the storage unit 2, the display control unit 3, the touch panel 6, and the like.
　照度センサ９は、外光（日光）を受光すると照度検出信号を制御部８に出力する。制御部８は、照度センサ９からの照度検出信号をＡ／Ｄ変換することで照度情報を取得できる。 The illuminance sensor 9 outputs an illuminance detection signal to the control unit 8 when it receives external light (sunlight). The control unit 8 can acquire illuminance information by A / D converting the illuminance detection signal from the illuminance sensor 9.
　赤外線型人感センサ１０は、例えば焦電型赤外センサとフレネルレンズとを有しており、赤外線を受光して生じた温度変化に応じた電圧信号を出力する。 The infrared human sensor 10 has, for example, a pyroelectric infrared sensor and a Fresnel lens, and outputs a voltage signal corresponding to a temperature change generated by receiving infrared light.
　次に、屋外表示システム１００におけるバックライト輝度制御に関して図３～図５を用いて説明する。本システムでは、通常輝度制御モードと、省エネ輝度制御モードの２通りのバックライト輝度制御モードを有している。通常輝度制御モードは、人物が表示装置３０の前にいる場合に採用される。このモードでは、図３のグラフで示される関係に基づき、バックライト４の輝度を照度に応じて制御する。省エネ輝度制御モードは、人物が表示装置３０の前にいない場合に採用され、バックライト４の輝度を抑えて省電力を図るモードである。このモードでは、図４のグラフで示される関係に基づき、バックライト４の輝度を照度に応じて制御する。 Next, backlight luminance control in the outdoor display system 100 will be described with reference to FIGS. This system has two backlight luminance control modes, a normal luminance control mode and an energy saving luminance control mode. The normal luminance control mode is employed when a person is in front of the display device 30. In this mode, the luminance of the backlight 4 is controlled according to the illuminance based on the relationship shown in the graph of FIG. The energy saving luminance control mode is employed when a person is not in front of the display device 30 and is a mode for reducing power consumption by suppressing the luminance of the backlight 4. In this mode, the luminance of the backlight 4 is controlled according to the illuminance based on the relationship shown in the graph of FIG.
　図５のフローチャートにおいて、初期状態では表示装置３０は通常輝度制御モードであると仮定する。 In the flowchart of FIG. 5, it is assumed that the display device 30 is in the normal luminance control mode in the initial state.
　ステップＳ１で、制御部８は、赤外線型人感センサ１０の出力に基づき、一定時間人が表示装置３０の前にいないかを判定する。 In step S <b> 1, the control unit 8 determines whether there is a person in front of the display device 30 for a predetermined time based on the output of the infrared human sensor 10.
　もし、制御部８が一定時間内に人が表示装置３０の前に現れたと判定すると（ステップＳ１のＮ）、ステップＳ２に進み、制御部８は、通常輝度制御モードを維持する。そして、ステップＳ３に進み、制御部８は、照度センサ９の出力に基づき照度情報を取得する。 If the control unit 8 determines that a person has appeared in front of the display device 30 within a predetermined time (N in step S1), the process proceeds to step S2, and the control unit 8 maintains the normal luminance control mode. And it progresses to step S3 and the control part 8 acquires illumination intensity information based on the output of the illumination intensity sensor 9. FIG.
　次に、ステップＳ４に進み、制御部８は、通常輝度制御モードにおける取得した照度情報に応じた輝度にバックライト４の輝度を制御する。通常輝度制御モードでは、図３に示す照度とバックライト輝度の関係を使用する。図３に示すように、照度が０ルクスから５０００ルクスまではバックライト輝度が２０％から１００％まで直線的に上昇し、５０００ルクスを超えるとバックライト輝度は１００％で一定となる。制御部８は、このような関係における取得した照度情報に応じたバックライト輝度を決定し（例えば、取得した照度が６０００ルクスなら１００％等）、決定された輝度になるようバックライト４の輝度を制御する。なお、図３における５０００ルクスの値は一例であり、これに限ることはないし、直線的にバックライト輝度が上昇する部分も直線的に限らず、例えば２次曲線的に上昇してもよい。 Next, in step S4, the control unit 8 controls the luminance of the backlight 4 to the luminance according to the acquired illuminance information in the normal luminance control mode. In the normal luminance control mode, the relationship between the illuminance and the backlight luminance shown in FIG. 3 is used. As shown in FIG. 3, when the illuminance is from 0 lux to 5000 lux, the backlight luminance increases linearly from 20% to 100%, and when it exceeds 5000 lux, the backlight luminance is constant at 100%. The control unit 8 determines the backlight luminance according to the acquired illuminance information in such a relationship (for example, 100% if the acquired illuminance is 6000 lux), and the luminance of the backlight 4 so that the determined luminance is obtained. To control. Note that the value of 5000 lux in FIG. 3 is an example, and the value is not limited to this. The portion where the backlight luminance increases linearly is not limited linearly, and may increase, for example, as a quadratic curve.
　これにより、人が表示装置３０の前にいる場合、照度が高いと１００％の輝度にバックライト４の輝度が制御されるので、表示装置３０の視認性を高めることができる。 Thus, when a person is in front of the display device 30, the luminance of the backlight 4 is controlled to 100% when the illuminance is high, so that the visibility of the display device 30 can be improved.
　一方、ステップＳ１で、制御部８が一定時間人がいないと判定した場合は（ステップＳ１のＹ）、視認性を低下させても問題ないので、ステップＳ５に進み、制御部８は、省エネ輝度制御モードへ移行する。そして、ステップＳ６に進み、制御部８は、照度センサ９の出力に基づき照度情報を取得する。 On the other hand, if it is determined in step S1 that the control unit 8 has no person for a certain period of time (Y in step S1), there is no problem even if the visibility is lowered, so the process proceeds to step S5. Transition to control mode. And it progresses to step S6 and the control part 8 acquires illumination intensity information based on the output of the illumination intensity sensor 9. FIG.
　次に、ステップＳ７に進み、制御部８は、省エネ輝度制御モードにおける取得した照度情報に応じた輝度にバックライト４の輝度を制御する。省エネ輝度制御モードでは、図４に示す照度とバックライト輝度の関係を使用する。図４に示すように、照度が０ルクスから５０００ルクスまではバックライト輝度が２０％から６０％まで直線的に上昇し、５０００ルクスを超えて１００００ルクスまではバックライト輝度は６０％で一定となる。さらに、１００００ルクスを超えるとバックライト輝度は１００％で一定となる。１００００ルクスは、直射日光が照射されている場合の照度レベルとしている。 Next, proceeding to step S7, the control unit 8 controls the luminance of the backlight 4 to the luminance according to the acquired illuminance information in the energy saving luminance control mode. In the energy saving luminance control mode, the relationship between the illuminance and the backlight luminance shown in FIG. 4 is used. As shown in FIG. 4, the backlight brightness increases linearly from 20% to 60% when the illuminance is from 0 lux to 5000 lux, and the backlight brightness is constant at 60% from 5,000 lux to 10,000 lux. Become. Furthermore, if it exceeds 10,000 lux, the backlight luminance becomes constant at 100%. 10,000 lux is the illuminance level when direct sunlight is applied.
　制御部８は、このような関係における取得した照度情報に応じたバックライト輝度を決定し（例えば、取得した照度が６０００ルクスなら６０％等）、決定された輝度になるようバックライト４の輝度を制御する。なお、図４における５０００ルクス、１００００ルクスの値は一例であり、これに限ることはないし、直線的にバックライト輝度が上昇する部分も直線的に限らず、例えば２次曲線的に上昇してもよい。 The control unit 8 determines the backlight luminance according to the acquired illuminance information in such a relationship (for example, 60% if the acquired illuminance is 6000 lux), and the luminance of the backlight 4 so that the determined luminance is obtained. To control. Note that the values of 5000 lux and 10000 lux in FIG. 4 are merely examples, and the present invention is not limited to this, and the portion where the backlight luminance increases linearly is not limited linearly, but increases, for example, as a quadratic curve. Also good.
　これにより、照度が低く（１００００ルクス以下）、表示装置３０の前に人がいない場合、最高で６０％に制限されてバックライト４の輝度が制御されるので、低消費電力を図ることができる。また、直射日光が照射されているときに人が表示装置３０の前に現れたが、赤外線型人感センサ１０における温度変化が少ないため人がいることが検出できず、一定時間人がいないと誤判定されてしまった場合でも、取得した照度が１００００ルクスを超えたとしてバックライト４の輝度が１００％に制御されるので、表示装置３０の視認性を高めることができる。 Thereby, when the illuminance is low (10,000 lux or less) and there is no person in front of the display device 30, the luminance of the backlight 4 is controlled to 60% at the maximum, so that low power consumption can be achieved. . In addition, a person appears in front of the display device 30 when being irradiated with direct sunlight, but since there is little temperature change in the infrared human sensor 10, it cannot be detected that there is a person, and there is no person for a certain period of time. Even if it is erroneously determined, the luminance of the backlight 4 is controlled to 100% assuming that the acquired illuminance exceeds 10,000 lux, so that the visibility of the display device 30 can be improved.
　即ち、図３に示す通常輝度制御モードと図４に示す省エネ輝度制御モードの双方共に、直射日光が当たっているレベルに対応する１００００ルクス以上の照度ではバックライト輝度を１００％とするようにしている。即ち、照度が高い場合は、赤外線型人感センサ１０の検知結果に関わらず、バックライト輝度を一定値（かつ高い値）に設定する。 That is, in both the normal luminance control mode shown in FIG. 3 and the energy-saving luminance control mode shown in FIG. 4, the backlight luminance is set to 100% at an illuminance of 10,000 lux or more corresponding to the level that is exposed to direct sunlight. Yes. That is, when the illuminance is high, the backlight luminance is set to a constant value (and a high value) regardless of the detection result of the infrared human sensor 10.
　以上、本発明の実施形態について説明したが、本発明の趣旨の範囲内であれば、実施形態は種々変更が可能である。 The embodiment of the present invention has been described above. However, the embodiment can be variously modified within the scope of the gist of the present invention.
　例えば、一定時間人がいないと判定された場合に用いられる図４に示す照度とバックライト輝度の関係では、０～５０００ルクスまではバックライト輝度が単調増加し、５０００～１００００ルクスまではバックライト輝度を６０％で一定としているが、０～１００００ルクスまでバックライトをオフとし、１００００ルクスを超えた場合のみ、バックライトをオンとしてもよい。また、０～１００００ルクスまでバックライト輝度を第１輝度（例えば２０％）とし、１００００ルクスを超えた場合にバックライト輝度を１００％としてもよい。また、０～５０００ルクスまではバックライト輝度を単調増加させるのではなく、一定輝度（例えば２０％）としてもよい。 For example, in the relationship between the illuminance and the backlight luminance shown in FIG. 4 used when it is determined that there is no person for a certain period of time, the backlight luminance increases monotonically from 0 to 5000 lux, and the backlight from 5000 to 10000 lux. Although the luminance is constant at 60%, the backlight may be turned off from 0 to 10,000 lux, and the backlight may be turned on only when the luminance exceeds 10,000 lux. Further, the backlight luminance may be set to the first luminance (for example, 20%) from 0 to 10,000 lux, and the backlight luminance may be set to 100% when exceeding 10,000 lux. Also, from 0 to 5000 lux, the backlight luminance may not be monotonously increased but may be constant luminance (for example, 20%).
　また、図３では５０００ルクスを超えるとバックライト輝度を１００％とし、図４では同じく５０００ルクスを超えるとバックライト輝度を６０％としているが、例えば、図４では４０００ルクスを超えるとバックライト輝度を６０％にしたり、６０００ルクスを超えるとバックライト輝度を６０％にしたりしてもよい。即ち、図３と図４で照度の閾値を異ならせてもよい。 Further, in FIG. 3, when the luminance exceeds 5000 lux, the backlight luminance is set to 100%, and in FIG. 4, the luminance is also set to 60% when exceeding 5000 lux. For example, in FIG. May be set to 60%, or the backlight brightness may be set to 60% when 6000 lux is exceeded. That is, the illuminance threshold value may be different between FIG. 3 and FIG.
　また、図３では５０００ルクスを超えるとバックライト輝度を１００％としているが、１００００ルクスを超えるとバックライト輝度を１００％とするようにしてもよい。即ち、図３と図４でバックライト輝度を１００％とする照度の閾値を同一としてもよい。 Further, in FIG. 3, the backlight brightness is set to 100% when it exceeds 5000 lux, but the backlight brightness may be set to 100% when it exceeds 10000 lux. That is, the illuminance threshold value at which the backlight luminance is 100% may be the same in FIGS.
　また、図３では５０００ルクスを超える場合にバックライト輝度を１００％で一定としているが、必ずしも１００％でなくてもよく、例えば８０％で一定としてもよい。例えば、図２のような太陽電池１１から電力供給を受ける屋外表示システム１００において、蓄電池５０の充電量が少ない場合、バックライト輝度を１００％から８０％に落とす。これにより、蓄電池５０へ充電する割合を（表示装置３０に供給する割合に対して）増やして夜や雨天の到来に備えることができる。 In FIG. 3, the backlight luminance is constant at 100% when it exceeds 5000 lux. However, the backlight luminance is not necessarily 100%, and may be constant at 80%, for example. For example, in the outdoor display system 100 that receives power supply from the solar cell 11 as shown in FIG. 2, the backlight luminance is reduced from 100% to 80% when the charge amount of the storage battery 50 is small. Thereby, the ratio which charges to the storage battery 50 can be increased (with respect to the ratio supplied to the display apparatus 30), and it can prepare for the arrival of the night or rainy weather.
　例えば表示装置３０としては液晶表示装置に限らず、プラズマディスプレイや有機ＥＬディスプレイ等の自発光型表示装置にも本発明は適用が可能である。 For example, the display device 30 is not limited to a liquid crystal display device, and the present invention can also be applied to a self-luminous display device such as a plasma display or an organic EL display.
　　　４　バックライト
　　　８　制御部
　　　９　照度センサ
　　　１０　赤外線型人感センサ
　　　１１　太陽電池
　　　２０　設置台
　　　３０　表示装置
　　　４０　コントローラ
　　　５０　蓄電池
　　　１００　屋外表示システム DESCRIPTION OF SYMBOLS 4 Backlight 8 Control part 9 Illuminance sensor 10 Infrared type human sensor 11 Solar cell 20 Installation stand 30 Display apparatus 40 Controller 50 Storage battery 100 Outdoor display system

Claims (4)

  1. 　表示部と、
    　前記表示部を照明する照明部と、
    　人感センサと、
    　前記人感センサの出力に基づき人物の有無を推定する推定部と、
    　外光の照度を取得する取得部と、
    　前記照明部の出力を制御する制御部と、を備え、
    　前記制御部は、
    　前記推定部が人物有と推定した場合、前記取得部が取得した照度が第１照度以下の範囲においては該照度に応じて前記照明部の出力を変化させ、
    　前記推定部が人物無と推定した場合、前記取得部が取得した照度が第２照度を超える範囲においては前記照明部の出力が少なくとも所定の輝度以上となるように制御する、
    　ことを特徴とする表示装置。     A display unit;
    An illumination unit for illuminating the display unit;
    A human sensor,
    An estimation unit that estimates the presence or absence of a person based on the output of the human sensor;
    An acquisition unit for acquiring the illuminance of outside light;
    A control unit for controlling the output of the illumination unit,
    The controller is
    When the estimator estimates that the person is present, the illuminance acquired by the acquisition unit is changed within the first illuminance or less in accordance with the illuminance,
    When the estimation unit estimates that there is no person, the illuminance acquired by the acquisition unit is controlled so that the output of the illumination unit is at least a predetermined luminance or more in a range where the illuminance acquired by the acquisition unit exceeds the second illuminance.
    A display device characterized by that.
  2. 　表示部と、
    　前記表示部を照明する照明部と、
    　赤外線型人感センサと、
    　前記赤外線型人感センサの出力に基づき人物の有無を推定する推定部と、
    　外光の照度を取得する取得部と、
    　前記照明部の出力を制御する制御部と、を備え、
    　前記推定部が人がいると推定した場合、前記制御部は、照度がゼロから第１照度までは輝度が第１輝度から第２輝度まで上昇し、照度が第１照度を超えると輝度が第２輝度で一定となるような照度と輝度の関係における前記取得部により取得された照度に応じた輝度に前記照明部の出力を制御し、
    　前記推定部が人がいないと推定した場合、前記制御部は、照度がゼロから第１照度までは輝度が第１輝度から第２輝度より低い第３輝度まで上昇し、照度が第１照度を超えて第２照度までは輝度が第３輝度で一定であり、照度が第２照度を超えると輝度が第２輝度で一定となるような照度と輝度の関係における前記取得部により取得された照度に応じた輝度に前記照明部の出力を制御する、
    　ことを特徴とする表示装置。     A display unit;
    An illumination unit for illuminating the display unit;
    An infrared human sensor,
    An estimation unit that estimates the presence or absence of a person based on the output of the infrared human sensor;
    An acquisition unit for acquiring the illuminance of outside light;
    A control unit for controlling the output of the illumination unit,
    When the estimation unit estimates that there is a person, the control unit increases the luminance from the first luminance to the second luminance when the illuminance is from zero to the first illuminance. Controlling the output of the illuminating unit to a luminance according to the illuminance acquired by the acquiring unit in the relationship between the illuminance and the luminance so as to be constant at two luminances;
    When the estimation unit estimates that there is no person, the control unit increases the luminance from the first luminance to the third luminance lower than the second luminance from zero to the first illuminance, and the illuminance decreases to the first illuminance. Luminance acquired by the acquisition unit in the relationship between illuminance and luminance such that the luminance is constant at the third luminance up to the second illuminance, and the luminance is constant at the second luminance when the illuminance exceeds the second illuminance. Controlling the output of the illumination unit to a luminance according to
    A display device characterized by that.
  3. 　前記制御部は、前記取得した照度が第１照度以下の場合、人物有と推定した場合の前記照明部の出力を、人物無と推定した場合の前記照明部の出力よりも大きくするように制御することを特徴とする請求項１に記載の表示装置。 When the acquired illuminance is less than or equal to the first illuminance, the control unit performs control so that the output of the illumination unit when it is estimated that there is a person is larger than the output of the illumination unit when it is estimated that there is no person The display device according to claim 1.
  4. 　太陽電池と、
    　前記太陽電池により得られた電力を蓄電する蓄電装置と、
    　請求項１に記載の表示装置と、を備え、
    　前記表示装置は、前記太陽電池と前記蓄電装置から電力供給を受けることを特徴とする表示システム。     Solar cells,
    A power storage device for storing electric power obtained by the solar cell;
    A display device according to claim 1,
    The display system receives power supply from the solar cell and the power storage device.
PCT/JP2011/070015 2010-12-24 2011-09-02 Display device and display system WO2012086269A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08211360A (en) * 1995-02-07 1996-08-20 N D R:Kk Liquid crystal image display device
JP2000242255A (en) * 1999-02-17 2000-09-08 Canon Inc Image display device
JP2005321737A (en) * 2004-05-11 2005-11-17 Fuji Xerox Co Ltd Image display device
JP2010097155A (en) * 2008-10-20 2010-04-30 Delta Electronics (Japan) Inc Lighting device for storage-type display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08211360A (en) * 1995-02-07 1996-08-20 N D R:Kk Liquid crystal image display device
JP2000242255A (en) * 1999-02-17 2000-09-08 Canon Inc Image display device
JP2005321737A (en) * 2004-05-11 2005-11-17 Fuji Xerox Co Ltd Image display device
JP2010097155A (en) * 2008-10-20 2010-04-30 Delta Electronics (Japan) Inc Lighting device for storage-type display device

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