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WO2009121295A1 - 户外可读液晶显示装置 - Google Patents

户外可读液晶显示装置 Download PDF

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Publication number
WO2009121295A1
WO2009121295A1 PCT/CN2009/071111 CN2009071111W WO2009121295A1 WO 2009121295 A1 WO2009121295 A1 WO 2009121295A1 CN 2009071111 W CN2009071111 W CN 2009071111W WO 2009121295 A1 WO2009121295 A1 WO 2009121295A1
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
liquid crystal
emitting diode
crystal display
display device
Prior art date
Application number
PCT/CN2009/071111
Other languages
English (en)
French (fr)
Inventor
邓威廉
彭旭辉
凌志华
黄忠守
Original Assignee
上海天马微电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海天马微电子有限公司 filed Critical 上海天马微电子有限公司
Priority to US12/935,487 priority Critical patent/US8624826B2/en
Publication of WO2009121295A1 publication Critical patent/WO2009121295A1/zh
Priority to US14/132,828 priority patent/US8847877B2/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/58—Arrangements comprising a monitoring photodetector
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • 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
    • 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

Definitions

  • the present invention relates to a liquid crystal display device, and more particularly to an outdoor readable liquid crystal display device. Background technique
  • liquid crystal display devices have been widely used for information display of electronic products because of their advantages such as thinness and low power consumption.
  • a conventional liquid crystal display device can be roughly classified into two types: a reflective liquid crystal display device and a transmissive liquid crystal display device.
  • the liquid crystal display device is different from a self-luminous liquid crystal display device such as CRT and EL.
  • the transmissive liquid crystal display device is displayed by illumination of a backlight disposed on the rear side of the liquid crystal display panel
  • the reflective liquid crystal display device is displayed by illumination of external ambient light. Therefore, the transmissive liquid crystal display device has an advantage of being able to perform bright high-contrast display due to the influence of external ambient light intensity, but the power consumption of the liquid crystal display device is excessive due to the arrangement of the backlight in the transmissive liquid crystal display device.
  • the reflective liquid crystal display device does not require an additional backlight device, it has an advantage of low power consumption.
  • the display brightness and contrast of the reflective liquid crystal display device are greatly affected by factors such as the magnitude of the external ambient light intensity.
  • FSC-LCD is a display device with many advantages.
  • the display device sequentially energizes the red, green, and blue (R, G, B) backlights, thereby sequentially illuminating the entire panel, specifically, sequentially applying red, green, and blue on the same pixel ( R, G, B)
  • R, G, B red, green, and blue
  • Three kinds of light, the eye produces an afterimage effect and mixes the three colors of red, green and blue to achieve continuous illumination.
  • the field sequential liquid crystal display device 1 includes: a first upper substrate 10 , a first lower substrate 11 , a first liquid crystal layer 12 disposed between the first upper substrate 10 and the first lower substrate 11 , and
  • the field sequential liquid crystal display device 1 provides a first backlight device 13 of a light source, and the first backlight device 13 includes a plurality of red light emitting diodes 13r, green light emitting diodes 13g, and blue light emitting diodes 13b.
  • the first lower substrate 11 is tight
  • a first pixel electrode 111 and a thin film transistor 112 serving as a switching element are formed on a side adjacent to the first liquid crystal layer 12, and the thin film transistor 112 is electrically connected to the first pixel electrode 111.
  • a first common electrode 101 facing the first pixel electrode 111 is formed on a side of the first upper substrate 10 adjacent to the first liquid crystal layer 12.
  • a black matrix 102 is disposed between the first common electrode 101 and the first upper substrate 10 and corresponding to the thin film transistor 112 of the first lower substrate 11, and the black matrix 102 is used to block the first bottom Light of a region other than the first pixel electrode 111 of H11.
  • FIG. 2 is a plan view of the first lower substrate 11 of the conventional field sequential liquid crystal display device 1.
  • a thin film transistor 112 as a pixel switch, a data line 113 for supplying a signal to the first pixel electrode 111 of the first lower substrate 11, and a gate for providing a switching signal to the thin film transistor 112 are disposed on the first lower substrate 11.
  • the data line 113 and the gate line 114 define a plurality of pixel regions 115, and each of the thin film transistors 112 is disposed in a pixel region 115 where the data line 113 and the gate line 114 intersect, and the thin film transistor 112 respectively
  • the data line 113 and the gate line 114 are electrically connected.
  • Fig. 3 is a timing chart showing the driving method of the conventional field sequential liquid crystal display device 1.
  • the driving method of the field sequential liquid crystal display device 1 according to the first backlight device 13, all the thin film transistors 112 are scanned, and the liquid crystal molecules of the first liquid crystal layer 12 are completely aligned to correspond to the respective first backlight devices 13.
  • all of the thin film transistor scanning (tTFT) 15, liquid crystal response (tLC) 16, and backlight (tBL) 17 in the field sequential liquid crystal display device 1 are completed in a time period of one field.
  • Fig. 4 is a schematic view showing the driving principle of the conventional field sequential liquid crystal display device 1.
  • the field sequential liquid crystal display device 1 further includes a first scan driver 18 and a first data driver 19.
  • the first lower substrate 11 of the field sequential liquid crystal display device 1 includes a plurality of pixel regions 115, and the pixels of all the pixel regions 115 are arranged in a matrix of rows and columns.
  • the first scan driver 18 sequentially scans the pixels of the pixel area 115 row by row, and the first data driver 19 transfers the image data to the pixel columns of the corresponding pixel area 115.
  • An object of the present invention is to provide an outdoor readable liquid crystal display device which is capable of realizing high brightness outdoor readable by the above-mentioned drawbacks of the prior art.
  • the outdoor readable liquid crystal display device of the present invention includes: a liquid crystal panel, wherein the liquid crystal panel includes an upper substrate, a lower substrate, and a liquid crystal layer disposed between the upper substrate and the lower substrate; and a backlight device having a plurality of red lights a diode, a green light emitting diode, a blue light emitting diode; and a light source control device for adjusting the backlight device based on the ambient light intensity; when the ambient light intensity is less than a preset light intensity of the outdoor readable liquid crystal display device, the backlight device
  • the red LED, the green LED, and the blue LED are sequentially energized and emit light with a predetermined time lag; when the ambient light intensity is greater than the preset light intensity, the red LED, the green LED, and the blue illuminator of the backlight
  • the diodes are illuminated at the same time.
  • the outdoor readable liquid crystal display device sequentially applies light of three colors of red, green, and blue (R, G, B) on the same pixel to cause an afterimage effect of the eye to mix the three colors.
  • the liquid crystal display device does not require an expensive color filter, realizes outdoor readable, P strives for low cost, improves resolution, and improves the utilization of illumination of the backlight device, and competes for low power consumption.
  • FIG. 1 is a schematic cross-sectional view showing a conventional field sequential liquid crystal display device
  • FIG. 2 is a plan view of a first lower substrate of a conventional field sequential liquid crystal display device
  • FIG. 3 is a timing diagram of a conventional field sequential liquid crystal display device
  • FIG. 4 is a schematic diagram of driving of a conventional field sequential liquid crystal display device
  • Figure 5 is an exploded perspective view of the outdoor readable liquid crystal display device of the present invention.
  • 6(a) and 6(b) are schematic diagrams showing the backlight timing of the outdoor readable liquid crystal display device of the present invention in the first embodiment
  • 7(a) and 7(b) are schematic diagrams showing the backlight timing of the outdoor readable liquid crystal display device of the present invention in the second embodiment
  • FIG. 8 is a schematic diagram of backlight timing of an outdoor readable field sequential liquid crystal display device according to a third embodiment of the present invention.
  • the reference numerals of the components in the figure are as follows:
  • First lower substrate 11 first pixel electrode 111
  • First liquid crystal layer 12 first backlight device 13
  • First scan driver 18 first data driver 19
  • Liquid crystal panel 210 second pixel electrode 211
  • Second backlight device 220 first polarizing plate 221a
  • Second scan driver 230 second data driver 240
  • the outdoor readable liquid crystal display device 200 of the present invention includes a liquid crystal panel 210, a second backlight device 220 for illuminating light to the liquid crystal panel 210, and a second scan for providing a scanning signal for the liquid crystal panel 210.
  • a second data driver 240 and a light source control device (not shown) for providing a data signal to the liquid crystal panel 210 for adjusting the second backlight 220 Brightness.
  • the liquid crystal panel 210 includes a second lower substrate 212 having a second pixel electrode 211, a second upper substrate 213 facing the second lower substrate 212, and a second upper substrate 213 disposed on the second substrate 213.
  • the second backlight device 220 includes a plurality of red light emitting diodes 220r, a green light emitting diode 220g, and a blue light emitting diode 220b, and further includes a first polarizing plate 221a and a second polarizing plate (not shown), the first polarizing plate 221a is attached to a side of the second lower substrate 212 facing away from the second pixel electrode 211, and the second polarizing plate is attached to a side of the second upper substrate 213 facing away from the second common electrode 214
  • the plurality of red LEDs 220r, the green LEDs 220g, and the blue LEDs 220b of the second backlight 220 are spaced apart from the first polarizer 221a and disposed to face each other.
  • the red LED 220r, the green LEDs 220g, and the blue LEDs 220b of the second backlight 220 are sequentially energized, the red LED 220r, the green LED 220g, and the blue LED 220b emit red at a predetermined time lag.
  • Lights of three colors of green and blue, or the red LED 220r, the green LED 220g, and the blue LED 220b are simultaneously lit, and the three colors of red, green and blue are superimposed on each other to form A white color of light.
  • the outdoor readable liquid crystal display device of the present invention further includes an ambient light detecting device (not shown) for detecting the ambient light intensity and outputting a detection signal, and the light source control device adjusts the second backlight device based on the detection signal. 220.
  • the light source control device detects the signal accordingly.
  • the red light emitting diode 220r, the green light emitting diode 220g, and the blue light emitting diode 220b are sequentially energized, and the red light emitting diode 220r, the green light emitting diode 220g, and the blue light emitting diode 220b emit red, green, and at a predetermined time lag.
  • Blue light of three colors, the light of the three colors of red, green and blue is irradiated from the first polarizing plate 221a to the second liquid crystal layer 215 via the second lower substrate 212, and the light reaching the second liquid crystal layer 215 is passed through the second
  • the upper substrate 213 is emitted from the second polarizing plate to the outside to form a color image; when the ambient light intensity detected by the ambient light detecting device is greater than the preset light intensity of the outdoor readable liquid crystal display device 200, the light source controlling device
  • the detection signal simultaneously illuminates the red LED 220r, the green LED 220g, and the blue LED 220b of the second backlight 220, wherein Red LED 220r of the second backlight device 220, green light
  • the diodes 220g and the blue light-emitting diodes 220b respectively emit light of three colors of red, green, and blue, and the lights of the three colors of red, green, and blue overlap each other to generate white light, and the white light passes through the first
  • the second lower substrate 212 is irradiated to the second liquid crystal layer 215, and the light reaching the second liquid crystal layer 215 is emitted from the second polarizing plate to the outside via the second upper reverse 213 to form a high-brightness black-and-white display image.
  • the difference from the first embodiment is that the backlight device is different. Specifically, in the first embodiment, the white LED 220w (not shown) is added to the second backlight device 220, Other configurations of the outdoor readable liquid crystal display device 200 are similar to those of the first embodiment, and are not described herein again.
  • the light source control device detects the signal accordingly.
  • the white LED 220w is turned off, and the red LED 220r, the green LED 220g, and the blue LED 220b of the second backlight 220 are sequentially energized, and the red LED 220r, the green LED 220g, and the blue LED are turned on.
  • the diode 220b emits light of three colors of red, green, and blue at a predetermined time lag, and the light of the three colors of red, green, and blue is irradiated from the first polarizing plate 221a to the second liquid crystal layer 215 via the second lower substrate 212.
  • the light reaching the second liquid crystal layer 215 is emitted from the second polarizing plate to the outside via the second upper substrate 213 to realize color display; when the detected ambient light intensity is greater than the preset light of the outdoor readable liquid crystal display device 200
  • the white LED 220w is lit, and at the same time, the red LED 220r, the green LED 220g, the blue
  • the light-emitting diodes 220b are sequentially energized, and emit light of three colors of red, green, and blue at a predetermined time lag, and the lights of the three colors of red, green, and blue are irradiated from the first polarizing plate 221a via the second lower substrate 212.
  • the second liquid crystal layer 215, the light reaching the second liquid crystal layer 215 is emitted from the second polarizing plate to the outside via the second upper substrate 213, and the white light emitting diode 220w is illuminated to make the white light emitting diode 220w readable by the outdoor
  • the liquid crystal display device 200 adds a white backlight to enhance the backlight to form a high-brightness color display image.
  • the outdoor readable liquid crystal display device 200 of the present invention includes a liquid crystal panel 210 for a second backlight 220 for illuminating the liquid crystal panel 210, a second scan driver 230 for supplying a scan signal to the liquid crystal panel 210, a second data driver 240 for providing a data signal to the liquid crystal panel 210, and A light source control device (not shown) is used to adjust the brightness of the second backlight device 220.
  • the liquid crystal panel 210 includes a second lower substrate 212 having a second pixel electrode 211, a second upper substrate 213 facing the second lower substrate 212, and a second upper substrate 213 disposed on the second substrate 213.
  • the second backlight device 220 includes a plurality of red light emitting diodes 220r, a green light emitting diode 220g, and a blue light emitting diode 220b, and further includes a first polarizing plate 221a and a second polarizing plate, and the first polarizing plate 221a is attached to the a side of the second lower substrate 212 facing away from the second pixel electrode 211, the second polarizing plate being attached to a side of the second upper substrate 213 facing away from the second common electrode 214, the second The plurality of red LEDs 220r, the green LEDs 220g, and the blue LEDs 220b of the backlight device 220 are spaced apart from the first polarizer 221a and disposed to face each other.
  • the red LED 220r, the green LEDs 220g, and the blue LEDs 220b of the second backlight 220 are sequentially energized, the red LED 220r, the green LED 220g, and the blue LED 220b emit red at a predetermined time lag.
  • Lights of three colors of green and blue, or the red LED 220r, the green LED 220g, and the blue LED 220b are simultaneously lit, and the three colors of red, green and blue are superimposed on each other to form A white color of light.
  • the outdoor readable liquid crystal display device of the present invention further includes an ambient light detecting device (not shown) for detecting the ambient light intensity and outputting a detection signal, and the light source control device adjusts the second backlight device based on the detection signal. 220.
  • the light source control device adjusts the red color of the second backlight device 220 according to the detection signal.
  • the bias voltage V of the light-emitting diode 220r, the green light-emitting diode 220g, and the blue light-emitting diode 220b is zero.
  • the bias voltage V is zero, and the red light-emitting diode 220r, the green light-emitting diode 220g, and the blue light-emitting diode 220b are The devices are sequentially energized, and emit light of three colors of red, green, and blue at a predetermined time lag, and the lights of the three colors of red, green, and blue are irradiated from the first polarizing plate 221a to the second liquid crystal layer via the second lower substrate 212.
  • the light reaching the second liquid crystal layer 215 is emitted from the second polarizing plate to the outside via the second upper reverse 213; when the environment is detected by the ambient light detecting device
  • the light source control device adjusts the red light emitting diode 220r, the green light emitting diode 220g, and the blue light emitting diode 220b of the second backlight device 220 according to the detection signal.
  • the backlight voltage V is adjusted, and the ambient light intensity is adjusted to a preset value, so that the brightness of the backlight provided by the second backlight device 220 is increased, and the red LED 220r, the green LED 220g,
  • the blue light-emitting diodes 220b are sequentially energized, and emit light of three colors of red, green, and blue at a predetermined time lag, and the three colors of the red, green, and blue light are transmitted from the first polarizing plate 221a to the second lower substrate 212.
  • the second liquid crystal layer 215 Upon irradiation to the second liquid crystal layer 215, light reaching the second liquid crystal layer 215 is emitted from the second polarizing plate to the outside via the second upper substrate 213, thereby forming a high-intensity color display image.
  • the outdoor readable liquid crystal display device 200 sequentially applies light of three colors of red, green, and blue (R, G, B) on the same pixel, so that the eye produces an afterimage effect and the three colors are mixed.
  • the liquid crystal display device does not require an expensive color filter, realizes outdoor readability, competes for low cost, improves resolution, improves the utilization of illumination of the backlight device, and reduces power consumption.

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

Description

户外可读液晶显示装置
本申请要求于 2008 年 4 月 3 日提交中国专利局、 申请号为 200810043215.6, 发明名称为 "户外可读液晶显示装置"的中国专利申请的优 先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种液晶显示装置， 尤其涉及一种户外可读液晶显示装置。 背景技术
近年来， 液晶显示装置因其轻薄、 功耗低等优点， 而被广泛应用于电子类 产品的信息显示。
现有的液晶显示装置大致可分为反射型液晶显示装置和透射型液晶显示 装置两种。所述液晶显示装置不同于 CRT和 EL之类的自发光型液晶显示装置。 其中，透射型液晶显示装置是通过配置于液晶显示面板后侧的背光源的光照作 用而进行显示， 反射型液晶显示装置是通过外部环境光的光照作用而进行显 示。 因而， 透射型液晶显示装置受外部环境光强度的影响小， 具有可进行明亮 的高对比度显示的优点，但因透射型液晶显示装置中背光源的设置使得液晶显 示装置耗电功率过大。反射型液晶显示装置不需要增设背光源装置， 所以具有 耗电功率小的优点，但是该反射型液晶显示装置的显示亮度及对比度受外部环 境光强度的大小等因素的影响较大。特别地，在暗的使用环境中存在分辨率极 低的缺点。
场序式液晶显示装置 ( Field- Sequential Color Liquid Crystal Display,
FSC-LCD )是一种具有诸多优点的显示装置。 该显示装置顺序地使红、 绿、蓝 ( R、 G、 B )背光灯通电， 进而时序的照亮整个面板， 具体而言， 即在同一个 像素上依序的施加红、 绿、 蓝（R、 G、 B )三种光， 使眼睛产生余像效应而使 红、 绿、 蓝三色混合， 达到持续照亮的效果。
图 1为现有场序式液晶显示装置 1结构的剖面示意图。 请参阅图 1， 该场 序式液晶显示装置 1包括： 第一上基板 10、 第一下基板 11、 配置于第一上基 板 10和第一下基板 11之间的第一液晶层 12及为所述场序式液晶显示装置 1 提供光源的第一背光装置 13， 所述第一背光装置 13包含若干红色发光二极管 13r、 绿色发光二极管 13g、 蓝色发光二极管 13b。 其中， 在第一下基板 11 紧 邻第一液晶层 12的一侧分别形成第一像素电极 111和用作开关元件的薄膜晶 体管 112， 该薄膜晶体管 112与第一像素电极 111电性连接。 在第一上基板 10 紧邻第一液晶层 12的一侧形成一与第一像素电极 111呈面向设置的第一共用 电极 101。 在所述第一共用电极 101与所述第一上基板 10之间， 且与第一下 基板 11的薄膜晶体管 112相对应处设置一黑底 102， 所述黑底 102用于遮挡 第一下 H 11的第一像素电极 111以外区域的光。
图 2为现有场序式液晶显示装置 1的第一下基板 11的俯视图。 该第一下 基板 11上设置作为像素开关的薄膜晶体管 112、 用以为所述第一下基板 11的 第一像素电极 111提供信号的数据线 113、 为所述薄膜晶体管 112提供开关信 号的栅极线 114。 所述数据线 113与所述栅极线 114定义多个像素区域 115， 而每个薄膜晶体管 112分别配置于数据线 113与栅极线 114相交处的像素区域 115内， 且薄膜晶体管 112分别与数据线 113及栅极线 114呈电性连接。
图 3示出了现有场序式液晶显示装置 1的驱动方法的时序示意图。在场序 式液晶显示装置 1 的驱动方法中， ^^据第一背光装置 13， 扫描所有薄膜晶体 管 112， 并使第一液晶层 12的液晶分子重新完全排列， 以对应各个第一背光 装置 13的红色发光二极管 13r、 绿色发光二极管 13g、 蓝色发光二极管 13b发 出的光。 具体而言， 即在一场的时间周期 14内完成所述场序式液晶显示装置 1中所有薄膜晶体管扫描（tTFT ) 15、 液晶响应 （tLC ) 16和背光照明 （ tBL ) 17。
图 4为现有的场序式液晶显示装置 1的驱动原理图。所述场序式液晶显示 装置 1进一步包括第一扫描驱动器 18和第一数据驱动器 19。并结合参阅图 2， 所述场序式液晶显示装置 1的第一下基板 11 包含了多个像素区域 115， 而所 有的像素区域 115的像素排列成一行列矩阵。 第一扫描驱动器 18依序对像素 区域 115的像素逐行进行扫描， 第一数据驱动器 19则把图像数据传送到对应 的像素区域 115的像素列。
然而， 利用上述常规的场序式液晶显示模式 1以获得很好的户外可读性， 必须增加第一背光装置 13发射出的光的亮度， 这就无形中增加了能耗。
针对现有技术所存在的问题， 本案设计人凭借从事此行业多年的经验， 并 本着精益求精的精神，积极研究改良， 于是有了本发明户外可读液晶显示装置 的产生。
发明内容
本发明的目的是针对上述现有技术存在的缺陷提供一种户外可读液晶显 示装置， 可以实现高亮度的户外可读。
为了解决上述问题， 本发明户外可读液晶显示装置包括： 液晶面板， 所述 液晶面板包括上基板、下基板及配置于上基板和下基板之间的液晶层； 背光装 置， 具有多个红色发光二极管、 绿色发光二极管、 蓝色发光二极管； 以及光源 控制装置， 用于基于环境光强度而调节背光装置； 当环境光强度小于所述户外 可读液晶显示装置的预设光强时， 背光装置的红色发光二极管、绿色发光二极 管、蓝色发光二极管被顺序通电， 并以预定时滞发光； 当环境光强度大于所述 预设光强时， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管 被同时点亮。
如上所述， 户外可读液晶显示装置在同一个像素上顺序地施加红、 绿、蓝 ( R、 G、 B )三种颜色的光， 使眼睛产生余像效应而使三色混合， 所述液晶显 示装置不需要昂贵的彩色滤光片 （color filter ), 实现户外可读， P争低成本， 提 高分辨率， 同时提高背光装置光照的利用率， P争低功耗。
附图说明
在说明书附图中：
图 1为现有的场序式液晶显示装置的剖视示意图；
图 2为现有的场序式液晶显示装置的第一下基板的俯视图；
图 3为现有的场序式液晶显示装置的时序示意图；
图 4为现有的场序式液晶显示装置的驱动原理图；
图 5为本发明户外可读液晶显示装置的立体分解图；
图 6 ( a )和图 6 ( b )为本发明户外可读液晶显示装置于第一实施例中的 背光时序示意图；
图 7 ( a )和图 7 ( b )为本发明户外可读液晶显示装置于第二实施例中的 背光时序示意图；
图 8 为本发明户外可读场序式液晶显示装置于第三实施例中的背光时序 示意图。 图中各组件的附图标记说明如下：
[现有技术]
场序式液晶显示装置 1
第一上基板 10 第一共用电极 101
第一下基板 11 第一像素电极 111
薄膜晶体管 112 数据线 113
栅极线 114 像素区域 115
第一液晶层 12 第一背光装置 13
时间周期 14 薄膜晶体管扫描 15
液晶响应 16 背光照明 17
第一扫描驱动器 18 第一数据驱动器 19
[本发明]
户外可读液晶显示装置 200
液晶面板 210 第二像素电极 211
第二下基板 212 第二上基板 213
第二共用电极 214 第二液晶层 215
第二背光装置 220 第一偏光板 221a
红光发光二极管 222r 绿光发光二极管 222g
蓝光发光二极管 222b 白色发光二极管 222w
第二扫描驱动器 230 第二数据驱动器 240
具体实施方式
为详细说明本发明的技术内容、构造特征、 所达成目的及功效， 下面将结 合实施例并配合图式予以伴细说明。 第一实施例
请参阅图 5， 本发明户外可读液晶显示装置 200包括液晶面板 210、 用于 将光照射到液晶面板 210的第二背光装置 220、 用于为所述液晶面板 210提供 扫描信号的第二扫描驱动器 230、 用于为所述液晶面板 210提供数据信号的第 二数据驱动器 240及光源控制装置（未图示）， 用以调节第二背光装置 220的 亮度。 其中， 所述液晶面板 210包括具第二像素电极 211的第二下基板 212、 与第二下基板 212呈面向设置的第二上基板 213、 设置于所述第二上基板 213 上且面向第二下基板 212—侧的第二共用电极 214、配置于所述第二下基板 212 与所述第二上基板 213之间的第二液晶层 215。 所述第二背光装置 220包括若 干红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b， 且进 一步包括第一偏光板 221a和第二偏光板（未图示）， 所述第一偏光板 221a贴 附于所述第二下基板 212的背向第二像素电极 211的一侧，所述第二偏光板贴 附于所述第二上基板 213的背向第二共用电极 214的一侧，所述第二背光装置 220的若干红色发光二极管 220r、绿色发光二极管 220g、蓝色发光二极管 220b 与所述第一偏光板 221a间隔一定距离并呈面向设置。 当第二背光装置 220的 若干红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b顺序 地通电时，红色发光二极管 220r、绿色发光二极管 220g、蓝色发光二极管 220b 以预定时滞发射红、 绿、 蓝三种颜色的光， 或是所述红色发光二极管 220r、 绿 色发光二极管 220g、 蓝色发光二极管 220b同时点亮， 所发出的红色、 绿色、 蓝色三种颜色的光相互叠加， 形成一白颜色的光。
特别地，本发明户外可读液晶显示装置还包括环境光检测装置（未图示）， 用以检测环境光强度， 并输出检测信号， 所述光源控制装置基于所述检测信号 调节第二背光装置 220。
请参阅图 6 ( a )及图 6 ( b )， 当通过环境光检测装置检测到的环境光强度 小于所述户外可读液晶显示装置 200的预设光强时，光源控制装置依此检测信 号， 顺序地为所述红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二 极管 220b通电， 所述红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光 二极管 220b并以预定时滞发射红、 绿、 蓝三种颜色的光， 所述红、 绿、 蓝三 种颜色的光从第一偏光板 221a经由第二下基板 212照射到第二液晶层 215， 到达第二液晶层 215的光经由第二上基板 213从第二偏光板射出到外部，以形 成彩色图像；当通过环境光检测装置检测到的环境光强度大于所述户外可读液 晶显示装置 200的预设光强时， 光源控制装置依此检测信号， 同时点亮所述第 二背光装置 220的红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二 极管 220b， 其中， 所述第二背光装置 220的红色发光二极管 220r、 绿色发光 二极管 220g、 蓝色发光二极管 220b相应的发出红、 绿、 蓝三种颜色的光， 所 述红、绿、蓝三种颜色的光彼此重叠以产生白光， 所述白光从第一偏光板 221a 经由第二下基板 212照射到第二液晶层 215， 到达第二液晶层 215的光经由第 二上 反 213从第二偏光板射出到外部， 形成高亮度的黑白显示图像。 第二实施例
在本实施例中， 较第一实施例不同之处在于背光装置不一样， 具体而言， 即在实施例一的 上，在第二背光装置 220中增加白色发光二极管 220w(未 图示）， 所述户外可读液晶显示装置 200的其它配置类似第一实施列， 在此不 再赘述。
请参阅图 7 ( a )及图 7 ( b )， 当通过环境光检测装置检测到的环境光强度 小于所述户外可读液晶显示装置 200的预设光强时，光源控制装置依此检测信 号， 关闭白色发光二极管 220w， 且同时顺序地为第二背光装置 220的红色发 光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b通电， 所述红色 发光二极管 220r、 绿色发光二极管 220g、蓝色发光二极管 220b并以预定时滞 发射红、 绿、 蓝三种颜色的光， 所述红、 绿、 蓝三种颜色的光从第一偏光板 221a经由第二下基板 212照射到第二液晶层 215，到达第二液晶层 215的光经 由第二上基板 213从第二偏光板射出到外部， 以实现彩色显示； 当检测到的环 境光强度大于所述户外可读液晶显示装置 200的预设光强时，点亮白色发光二 极管 220w， 与此同时， 所述红色发光二极管 220r、 绿色发光二极管 220g、 蓝 色发光二极管 220b被顺序通电， 并以预定时滞发射红、 绿、蓝三种颜色的光， 所述红、 绿、 蓝三种颜色的光从第一偏光板 221a经由第二下基板 212照射到 第二液晶层 215， 到达第二液晶层 215的光经由第二上基板 213从第二偏光板 射出到外部，通过点亮白色发光二极管 220w， 使得所述白色发光二极管 220w 为所述户外可读液晶显示装置 200增加一白色的背光，使其背光加强， 而形成 高亮度的彩色显示图像。 第三实施例
请参阅图 5， 本发明户外可读液晶显示装置 200包括液晶面板 210、 用于 将光照射到液晶面板 210的第二背光装置 220、 用于为所述液晶面板 210提供 扫描信号的第二扫描驱动器 230、 用于为所述液晶面板 210提供数据信号的第 二数据驱动器 240及光源控制装置（未图示）， 用以调节第二背光装置 220的 亮度。 其中， 所述液晶面板 210包括具第二像素电极 211的第二下基板 212、 与第二下基板 212呈面向设置的第二上基板 213、 设置于所述第二上基板 213 上且面向第二下基板 212—侧的第二共用电极 214、配置于所述第二下基板 212 与所述第二上基板 213之间的第二液晶层 215。 所述第二背光装置 220包括若 干红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b， 且进 一步包括第一偏光板 221a和第二偏光板，所述第一偏光板 221a贴附于所述第 二下基板 212的背向第二像素电极 211的一侧，所述第二偏光板贴附于所述第 二上基板 213的背向第二共用电极 214的一侧，所述第二背光装置 220的若干 红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b与所述第 一偏光板 221a间隔一定距离并呈面向设置。 当第二背光装置 220的若干红色 发光二极管 220r、绿色发光二极管 220g、蓝色发光二极管 220b顺序地通电时， 红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b以预定时 滞发射红、 绿、 蓝三种颜色的光， 或是所述红色发光二极管 220r、 绿色发光二 极管 220g、 蓝色发光二极管 220b同时点亮， 所发出的红色、 绿色、 蓝色三种 颜色的光相互叠加， 形成一白颜色的光。
特别地，本发明户外可读液晶显示装置还包括环境光检测装置（未图示）， 用以检测环境光强度， 并输出检测信号， 所述光源控制装置基于所述检测信号 调节第二背光装置 220。
请参阅图 8， 当通过环境光检测装置检测到的环境光强度小于所述户外可 读液晶显示装置 200的预设光强时， 光源控制装置依此检测信号，调节第二背 光装置 220的红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b的偏置电压 V，此时偏置电压 V大小为零，又，所述红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b被顺序通电， 并以预定时滞发射 红、 绿、 蓝三种颜色的光， 所述红、 绿、 蓝三种颜色的光从第一偏光板 221a 经由第二下基板 212照射到第二液晶层 215， 到达第二液晶层 215的光经由第 二上 反 213从第二偏光板射出到外部；当通过环境光检测装置检测到的环境 光强度大于所述户外可读液晶显示装置 200的预设光强时，光源控制装置依此 检测信号， 调节第二背光装置 220的红色发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b的偏置电压 V， 此时偏置电压 V应环境光强度调 设至一预设值， 从而， 第二背光装置 220提供的背光亮度增加， 且， 所述红色 发光二极管 220r、 绿色发光二极管 220g、 蓝色发光二极管 220b被顺序通电， 并以预定时滞发射红、 绿、 蓝三种颜色的光， 所述红、 绿、 蓝三种颜色的光从 第一偏光板 221a经由第二下基板 212照射到第二液晶层 215， 到达第二液晶 层 215的光经由第二上基板 213从第二偏光板射出到外部，形成高亮度的彩色 显示图像。
综上所述，户外可读液晶显示装置 200在同一个像素上顺序地施加红、绿、 蓝（R、 G、 B )三种颜色的光， 使眼睛产生余像效应而使三色混合， 所述液晶 显示装置不需要昂贵的彩色滤光片 （color filter ), 实现户外可读， P争低成本， 提高分辨率， 同时提高背光装置光照的利用率， 降低功耗。
本领域技术人员均应了解，在不脱离本发明的精神或范围的情况下，可以 对本发明进行各种修改和变型。 因而，如果任何修改和变型落入所附权利要求 书以及等同物的保护范围内时， 认为本发明涵盖这些修改和变型。

Claims

权 利 要 求
1. 一种户外可读液晶显示装置， 包括： 一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置， 具有多个红色发光二极管、绿色发光二极管、蓝色发光二极 管； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
其中， 当环境光强度小于所述户外可读液晶显示装置的预设光强时， 背光 装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管被顺序通电， 并以 预定时滞发光； 当环境光强度大于所述预设光强时， 背光装置的红色发光二极 管、 绿色发光二极管、 蓝色发光二极管被同时点亮。
2. 根据权利要求 1所述的户外可读液晶显示装置， 其中， 所述户外可读液晶 显示装置的背光装置还包括白色发光二极管， 并当环境光强度大于预设光强 时， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管和白色发 光二极管被同时点亮。
3. 一种户外可读液晶显示装置， 包括： 一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置， 具有多个红色发光二极管、绿色发光二极管、蓝色发光二极 管、 白色发光二极管； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
其中， 当环境光强度小于所述户外可读液晶显示装置的预设光强时， 白色 发光二极管关闭， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二 极管被顺序通电， 并以预定时滞发光； 当环境光强度大于所述预设光强时， 白 色发光二极管通电并发光， 同时， 背光装置的红色发光二极管、 绿色发光二极 管、 蓝色发光二极管被顺序通电， 并以预定时滞发光。
4. 一种户外可读液晶显示装置， 包括： 一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置，具有多个红色发光二极管、绿色发光二极管、蓝色发光二极； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
其中， 当环境光强度小于所述户外可读液晶显示装置的预设光强时， 背光 装置的红色发光二极管、 绿色发光二极管、 蓝色发光二极管的偏置电压为零， 且所述红色发光二极管、 绿色发光二极管、蓝色发光二极管被顺序通电， 并以 预定时滞发光； 当环境光强度大于所述预设光强时， 背光装置的红色发光二极 管、 绿色发光二极管、蓝色发光二极管的偏置电压增加， 且所述红色发光二极 管、 绿色发光二极管、 蓝色发光二极管被顺序通电， 并以预定时滞发光。
5. 根据权利要求 4所述的户外可读液晶显示装置， 其中， 当环境光强度大于 所述预设光强时， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二 极管的偏置电压增加的大小随环境光强度的增加而增大。
6. 根据权利要求 1至权利要求 5中任一权利要求所述的户外可读液晶显示装 置， 其中， 所述户外可读液晶显示装置还包括环境光检测装置， 用以检测环境 光强度， 并输出检测信号， 所述光源控制装置基于所述检测信号调节背光装 置。
7. 一种户外可读液晶显示装置的驱动方法， 所述户外可读液晶显示装置包 括：
一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置， 具有多个红色发光二极管、 绿色发光二极管、蓝色发光二极 管； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
所述户外可读液晶显示装置的驱动方法包括，当环境光强度小于所述户外 可读液晶显示装置的预设光强时， 背光装置的红色发光二极管、绿色发光二极 管、蓝色发光二极管被顺序通电， 并以预定时滞发光； 当环境光强度大于所述 预设光强时， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管 被同时点亮。
8. 一种户外可读液晶显示装置的驱动方法， 所述户外可读液晶显示装置包 括：
一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置， 具有多个红色发光二极管、 绿色发光二极管、蓝色发光二极 管、 白色发光二极管； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
所述户外可读液晶显示装置的驱动方法包括，当环境光强度小于所述户外 可读液晶显示装置的预设光强时， 白色发光二极管关闭， 背光装置的红色发光 二极管、 绿色发光二极管、 蓝色发光二极管被顺序通电， 并以预定时滞发光； 当环境光强度大于所述预设光强时， 白色发光二极管通电并发光， 同时， 背光 装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管被顺序通电， 并以 预定时滞发光。
9. 一种户外可读液晶显示装置的驱动方法， 所述户外可读液晶显示装置包 括：
一液晶面板， 所述液晶面板包括上基板、下基板及配置于所述上基板和所 述下基板之间的液晶层；
一背光装置，具有多个红色发光二极管、绿色发光二极管、蓝色发光二极； 以及
一光源控制装置， 用于基于环境光强度大小调节背光装置；
所述户外可读液晶显示装置的驱动方法包括，当环境光强度小于所述户外 可读液晶显示装置的预设光强时， 背光装置的红色发光二极管、绿色发光二极 管、蓝色发光二极管的偏置电压为零， 且所述红色发光二极管、 绿色发光二极 管、蓝色发光二极管被顺序通电， 并以预定时滞发光； 当环境光强度大于所述 预设光强时， 背光装置的红色发光二极管、 绿色发光二极管、蓝色发光二极管 的偏置电压增加， 且所述红色发光二极管、 绿色发光二极管、蓝色发光二极管 被顺序通电， 并以预定时滞发光。
PCT/CN2009/071111 2008-04-03 2009-03-31 户外可读液晶显示装置 WO2009121295A1 (zh)

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