WO2005078514A1 - 液晶表示装置及び情報機器 - Google Patents
液晶表示装置及び情報機器 Download PDFInfo
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- WO2005078514A1 WO2005078514A1 PCT/JP2005/001949 JP2005001949W WO2005078514A1 WO 2005078514 A1 WO2005078514 A1 WO 2005078514A1 JP 2005001949 W JP2005001949 W JP 2005001949W WO 2005078514 A1 WO2005078514 A1 WO 2005078514A1
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- liquid crystal
- image
- crystal panel
- light
- display device
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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
- G09G3/3406—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
-
- 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
-
- 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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
-
- 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
- G02F1/133342—Constructional arrangements; Manufacturing methods for double-sided displays
-
- 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
- G02F1/133616—Front illuminating devices
-
- 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
- G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
Definitions
- the present invention relates to a liquid crystal display device that displays an image on a liquid crystal panel having two display surfaces, and an information device such as a mobile phone, a personal digital assistant (PDA) or a wristwatch equipped with the liquid crystal display device. It is about.
- an information device such as a mobile phone, a personal digital assistant (PDA) or a wristwatch equipped with the liquid crystal display device. It is about.
- a first reflective polarizer and a first absorption polarizer are disposed on one display surface side of the liquid crystal cell, and a second reflective polarizer and second absorption polarizer are disposed on the other display surface side of the liquid crystal cell.
- this liquid crystal display device is configured as described above, the same image is displayed on the front display surface and the back display surface (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-193956 (paragraph numbers [0026] to [0071], FIG. 1) [0005] Since the conventional liquid crystal display device is configured as described above, There is a problem that an image can be displayed on one screen, but an image different from the image displayed on one screen cannot be displayed on the other screen.
- the present invention has been made to solve the above-described problem, and a liquid crystal display device capable of displaying an image different from an image displayed on one display surface on another display surface. The purpose is to obtain the position.
- Another object of the present invention is to provide an information device equipped with a liquid crystal display device capable of displaying an image different from an image displayed on one display surface on the other display surface.
- the pixel driving circuit while the pixel driving circuit alternately displays the first image and the second image on the liquid crystal panel, the first image is displayed while the pixel driving circuit displays the first image.
- the first front light is turned on, and the second front light is turned on while the second image is displayed by the pixel driving circuit.
- FIG. 1 is a cross-sectional view showing an information device equipped with a liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 2 is a sectional view showing a liquid crystal panel of the liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 3 is an explanatory diagram showing rewriting timings of a first image and a second image.
- FIG. 4 is a configuration diagram showing a part of an information device equipped with a liquid crystal display device according to a second embodiment of the present invention.
- FIG. 5 (a) is an explanatory view showing a front light guide plate 46
- FIG. 5 (b) is a side view showing a front light guide plate 46.
- FIG. 6 is an explanatory diagram showing rewriting timings of a first image and a second image.
- FIG. 7 is an explanatory view showing a front light guide plate.
- FIG. 8 is an explanatory view showing a front light guide plate.
- FIG. 9 is a sectional view showing a liquid crystal panel 11 of a liquid crystal display device according to Embodiment 3 of the present invention.
- FIG. 10 is an explanatory diagram showing details of specifications of an optical film in the liquid crystal panel 11 of FIG. 9.
- FIG. 11 is an explanatory diagram showing voltage-transmittance characteristics of the liquid crystal panel 11 of FIG.
- FIG. 12 is an explanatory diagram showing optical response characteristics of each pixel of a liquid crystal panel when driven at a frequency of 120 Hz.
- FIG. 13 is an explanatory diagram showing a reflection spectrum of a circularly polarizing plate in the liquid crystal panel 11 of FIG.
- FIG. 14 is an explanatory diagram showing details of specifications of an optical film in the liquid crystal panel 11 of FIG. 9.
- FIG. 15 is an explanatory diagram showing a reflection spectrum of a circularly polarizing plate in the liquid crystal panel 11 of FIG. 9.
- FIG. 16 is a sectional view showing a liquid crystal panel 11 of a liquid crystal display device according to Embodiment 6 of the present invention.
- FIG. 17 is an explanatory diagram showing details of specifications of an optical film in the liquid crystal panel 11 of FIG.
- FIG. 19 is an explanatory diagram showing a reflection spectrum of a circularly polarizing plate in the liquid crystal panel 11 of FIG.
- FIG. 20 is an explanatory view showing details of specifications of an optical film in the liquid crystal panel 11 of FIG.
- FIG. 21 is an explanatory diagram showing a reflection spectrum of a circularly polarizing plate in the liquid crystal panel 11 of FIG.
- FIG. 22 is a cross-sectional view showing a liquid crystal display device according to Embodiment 8 of the present invention.
- FIG. 23 is an explanatory diagram showing the luminance of the liquid crystal panel 11.
- FIG. 24 is an explanatory diagram showing the contrast of the liquid crystal panel 11.
- FIG. 25 is an explanatory diagram showing the luminance of the liquid crystal panel 11.
- FIG. 26 is an explanatory diagram showing the contrast of the liquid crystal panel 11.
- FIG. 27 is a cross-sectional view showing knock lights 12 and 13 in which triangular reflecting prisms are formed.
- FIG. 1 is a cross-sectional view showing an information device equipped with a liquid crystal display device according to Embodiment 1 of the present invention.
- the information device in the first embodiment is a mobile phone, the information device is not limited to this, and may be, for example, a portable electronic organizer (PDA) or a wristwatch.
- PDA portable electronic organizer
- a main body 1 of a mobile phone is equipped with, for example, a numeric keypad for inputting characters and numbers, and a function switch 2 such as operation keys for performing various operations.
- the display unit 3 of the mobile phone is openably and closably connected to the main body 1 via a hinge 4, and the display unit 3 is mounted with a liquid crystal display device.
- the liquid crystal panel 11 is configured using a liquid crystal cell having a plurality of pixels.
- the front light 12 (first front light) is arranged on the display surface l ib of the liquid crystal panel 11 and lights up while the first screen viewed by the observer A is displayed on the liquid crystal panel 11.
- the front light 13 (second front light) is arranged on the side of the display surface 11a of the liquid crystal panel 11, and the second screen viewed by the observer B is displayed on the liquid crystal panel 11 and is turned on during a short time.
- the transparent cover 14 is provided in an opening (window) provided on the inner surface of the display unit 3, and the transparent cover 15 is provided in an opening (window) provided on the outer surface of the display unit 3.
- the pixel driving circuit 16 When receiving the image data from the image controller 17 of the mobile phone, the pixel driving circuit 16 applies the image data to each pixel on a plurality of gate lines in the liquid crystal panel 11 to display an image on the liquid crystal panel 11.
- the image data of the first image and the second image is received from the image controller 17, the first image and the second image are alternately displayed on the liquid crystal panel 11.
- the image controller 17 outputs, to the pixel drive circuit 16, image data corresponding to, for example, the operation content of the function switch 2 and the transmission / reception status of telephone and mail, and controls the turning on / off of the front lights 12 and 13.
- FIG. 2 is a cross-sectional view showing the liquid crystal panel 11 of the liquid crystal display device according to Embodiment 1 of the present invention.
- the liquid crystal cell 21 has a plurality of pixels, and the liquid crystal cell 21 has a pair of transparent pixels. It is held by the lath substrate 22. The periphery of the liquid crystal cell 21 is sealed by a sealing material 23.
- the pair of polarizing plates 24 are disposed outside the transparent glass substrate 22 and polarize the light emitted from the pixels of the liquid crystal cell 21.
- the observer A can observe the display surface 11a of the liquid crystal panel 11 through the transparent cover 14, and the observer B can see the transparent cover 15 as shown in FIG. Through this, the display surface l ib of the liquid crystal panel 11 can be observed.
- the image controller 17 of the mobile phone outputs, to the pixel driving circuit 16, image data corresponding to, for example, the operation content of the function switch 2 and the transmission / reception status of a telephone or mail. Given an operation that requires one observer to show the second image to observer B, or an operation that requires observer A to hide the visible image without showing it to observer B, etc.
- the image data of the first image and the second image are output to the pixel driving circuit 16, and an image control signal for instructing the alternate display of the first image and the second image is output to the pixel driving circuit 16.
- the image controller 17 outputs a light control signal for controlling turning on / off of the front lights 12 and 13 to the front lights 12 and 13.
- the pixel drive circuit 16 receives the image data of the first image and the second image from the image controller 17 of the mobile phone, and upon receiving the image control signal from the image controller 17, firstly, the image data of the first image Is applied to each pixel of the gate line 11 -N on the liquid crystal panel 11 to display the first image on the liquid crystal panel 11.
- the front light 12 is turned on while the first image is displayed on the liquid crystal panel 11 under the instruction of the light control signal output from the image controller 17.
- the observer A can see the first image displayed on the display surface 11a of the liquid crystal panel 11 through the transparent cover 14.
- FIG. 3 is an explanatory diagram showing rewriting timings of the first image and the second image.
- the horizontal axis represents time, and the vertical axis represents the transmittance of the pixel on the gate line 1-1 N.
- the pixel driving circuit 16 displays the first image on the liquid crystal panel 11
- the image data of the first image is applied to the gate lines 111 of the liquid crystal panel 11 in order.
- the front light 12 lights up simultaneously on the entire screen, so the first screen is displayed on the display surface 11a of the liquid crystal panel 11 at the same time. Is done.
- the pixel driving circuit 16 turns off the front light 12 under the instruction of the light control signal, and then outputs the image data of the second image.
- a second image is displayed on the liquid crystal panel 11 by applying a voltage to each pixel of the gate line 11 -N on the liquid crystal panel 11.
- the front light 13 is turned on while the second image is displayed on the liquid crystal panel 11 under the instruction of the light control signal output from the image controller 17.
- the observer B can see the second image displayed on the display surface l ib of the liquid crystal panel 11 through the transparent cover 15.
- the pixel driving circuit 16 displays the second image on the liquid crystal panel 11
- the image data of the second image is sequentially transmitted to the gate lines 1-N on the liquid crystal panel 11.
- the front light 13 lights up simultaneously over the entire screen, so that the display surface l ib of the liquid crystal panel 11 The screen is displayed at the same time.
- the pixel drive circuit 16 alternately displays the first image and the second image on the liquid crystal panel 11 in the same manner as described above, and the front lights 12 and 13 alternately light.
- the rewriting cycle of the first image and the second image in the pixel driving circuit 16 is made to coincide with the lighting cycle of the front lights 12 and 13, and each cycle is set to a frequency of 60 Hz or more (total of 120 Hz or more). Then, observer A will see the first image blinking at a frequency of 60 Hz or more, and observer B will see the second image blinking at a frequency of 60 Hz or more. However, human eyes do not recognize blinking at a frequency of 60 Hz or more as blinking, and recognize that the image is displayed continuously.
- the first driving is performed by the pixel driving circuit 16.
- the front light 12 is turned on while the image is displayed, and the front light 13 is turned on while the second image is displayed by the pixel drive circuit 16.
- the second image different from the first image can be shown to the observer B. Therefore, it is particularly effective when the image viewed by observer A needs to be hidden from observer B. Also, it becomes possible to display characters and the like correctly to observers A and B, respectively.
- the pixel driving circuit 16 displays the first image or the second image on the liquid crystal panel 11
- the gate lines 11N on the liquid crystal panel 11 Since the image data of the image to be displayed on the liquid crystal panel 11 is applied in order, and the image data is applied to all the gate lines 11-N and the power is turned on by the front light 12 or the front light 13, the liquid crystal is applied. This has the effect that an image can be displayed simultaneously over the entire screen of panel 11.
- the front lights 12 and 13 each include one light source, and when one light source is turned on, the front lights 12 and 13 are simultaneously turned on over the entire screen of the liquid crystal panel 11.
- the plurality of light sources are sequentially turned on, for example, in synchronization with an operation in which an image displayed on the liquid crystal panel 11 is rewritten from the upper part of the screen to the lower part. It may be turned on in order toward the bottom.
- FIG. 4 is a configuration diagram showing a part of an information device equipped with a liquid crystal display device according to Embodiment 2 of the present invention.
- the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Description is omitted.
- the timing controller 31, the gate driver 32, and the source driver 33 constitute a pixel driving circuit corresponding to the pixel driving circuit 16 in FIG.
- the timing controller 31 When the timing controller 31 receives the image data of the first image and the second image from the image controller 17, the timing controller 31 sends the image data of the first image or the second image to the source driver 33 according to the image control signal output from the image controller 17. At the same time, the synchronization signal output from the image controller 17 is output to the gate driver 32 and the source driver 33. Further, the timing controller 31 outputs a light control signal output from the image controller 17 to the lighting control device 45.
- the gate driver 32 sequentially selects gate lines from which the source driver 33 outputs image data, based on the synchronization signal output from the image controller 17.
- the source driver 33 applies image data to each pixel of the gate line selected by the gate driver 32 by operating based on the synchronization signal output from the image controller 17.
- the light sources 41 to 44, the lighting control device 45, and the front light guide plate 46 constitute a front light corresponding to the front lights 12 and 13 in FIG.
- the lighting control device 45 When the lighting control device 45 receives the light control signal from the timing controller 31, it turns on the light sources 41 and 44 in order.
- the front light guide plate 46 has a reflecting prism 46a for reflecting light emitted from the light sources 41-44, and the reflecting prism 46a extends in a direction parallel to the rows of the light sources 41-44.
- FIG. 5 (a) is an explanatory view showing the front light guide plate 46
- FIG. 5 (b) is a side view showing the front light guide plate 46.
- an operation content that requires the observer A to show the first image and the observer B to show the second image is given to the image controller 17 of the mobile phone.
- the image controller 17 outputs the image data of the first image and the second image to the timing controller 31 of the pixel driving circuit 16 and also outputs an image control signal for instructing the alternate display of the first image and the second image. Is output to the timing controller 31.
- the image controller 17 outputs a light control signal for controlling turning on / off of the front lights 12 and 13 to the timing controller 31.
- the timing controller 31 of the pixel drive circuit 16 receives the image data of the first image and the second image from the image controller 17, the timing controller 31 outputs the first image or the second image according to the image control signal output from the image controller 17. Is output to the source driver 33. That is, the timing controller 31 alternately outputs the image data of the first image and the image data of the second image to the source driver 33 according to the image control signal output from the image controller 17.
- the timing controller 31 outputs a synchronization signal output from the image controller 17 to the gate driver 32 and the source driver 33, and outputs a light control signal output from the image controller 17 to the lighting control device 45.
- the gate driver 32 of the pixel drive circuit 16 sequentially selects a gate line from which the source driver 33 outputs image data, based on a synchronization signal output from the image controller 17.
- the gate driver 32 operates on the basis of the synchronization signal output from the image controller 17 so that the source driver 33 can output image data as a gate line from the gate line 1 to the gate line 2 ⁇ Gate line 3 ⁇ Gate line N— 1
- the source driver 33 of the pixel drive circuit 16 When the source driver 33 of the pixel drive circuit 16 receives the image data of the first image from the timing controller 31, the source driver 33 operates based on the synchronization signal output from the image controller 17, so that the gate driver 32 The first image is displayed on the liquid crystal panel 11 by applying the image data of the first image to each pixel of the selected gate line.
- the source driver 33 operates on the basis of the synchronization signal output from the image controller 17, and thereby, in the order of gate line 1, gate line 2, gate line 3, gate line N-1, gate line N,
- the image data of the first image is assigned to each pixel of the gate line.
- the first image is displayed on the liquid crystal panel 11 by applying one touch.
- the lighting control device 45 of the front light 12 receives the light control signal from the timing controller 31, while the first image is being displayed on the liquid crystal panel 11, the light sources 41 to 44 are sequentially turned on. Turn on.
- the front light guide plate 46 of the front light 12 reflects the light emitted from the light sources 41-44 toward the liquid crystal panel 11, so that the observer A can pass through the transparent cover 14 to the display surface 1 of the liquid crystal panel 11. You can see the first image displayed on la.
- the light emitted from the light sources 41 to 44 travels in the front light guide plate 46 in a direction substantially parallel to the gate line, so that an illumination area parallel to the gate line is generated. Therefore, illumination can be performed in a state where the delay time until the illumination is turned on is almost equal to the panel writing force on the entire screen.
- the observer B can see the first image displayed on the display surface l ib of the liquid crystal panel 11 through the transparent cover 15. Can not.
- FIG. 6 is an explanatory diagram showing the rewriting timing of the first image and the second image.
- the horizontal axis represents time
- the vertical axis represents the transmittance of the pixel on the gate line 11 N. Is shown.
- the light source power corresponding to the gate line to which the image data is applied is also turned on in order, that is, the light source 41 ⁇ the light source 42 ⁇ the light source 43 ⁇ the light source 44 is turned on in this order.
- the front light Since the time from when the voltage is applied to when the front light is turned on is almost the same, the front light is turned on while each pixel on the gate line 11N is stable, and it is possible to improve the uneven brightness of the entire screen of the liquid crystal panel 11. it can. Therefore, a bright and stable gradation can be realized.
- the gate driver 32 of the pixel drive circuit 16 operates the lighting control device 45 of the front light 12 under the instruction of the light control signal.
- the source driver 33 sequentially selects the gate lines to output the image data based on the synchronization signal output from the image controller 17. That is, the gate driver 32 operates on the basis of the synchronization signal output from the image controller 17 so that the source driver 33 can output image data as a gate line from the gate line 1 to the gate line 2 ⁇ Gate line 3 ⁇ Gate line N— 1
- the source driver 33 of the pixel driving circuit 16 When receiving the image data of the second image from the timing controller 31, the source driver 33 of the pixel driving circuit 16 operates based on the synchronization signal output from the image controller 17, and The second image is displayed on the liquid crystal panel 11 by applying the image data of the second image to each pixel of the selected gate line.
- the source driver 33 operates on the basis of the synchronization signal output from the image controller 17, and thereby, in the order of gate line 1, gate line 2, gate line 3, gate line N-1, gate line N,
- the second image is displayed on the liquid crystal panel 11 by applying image data of the second image to each pixel of the gate line.
- the lighting control device 45 of the front light 13 receives the light control signal from the timing controller 31, while the second image is displayed at the position where the liquid crystal panel 11 overlaps, the lighting control device 45 of the front light 13 Light 41-44 in order.
- the front light guide plate 46 of the front light 13 reflects the light emitted from the light sources 41 to 44 toward the liquid crystal panel 11, so that the observer B can pass through the transparent cover 15 to the display surface 1 of the liquid crystal panel 11. You can see the second image displayed on the lb.
- the observer A is displayed on the display surface 1 la of the liquid crystal panel 11 through the transparent cover 14. I can't see the second image.
- the image data of the second image is sequentially applied to the gate lines 11N of the liquid crystal panel 11.
- the light source power corresponding to the gate line to which the image data is applied first is also turned on in order, that is, the light source 41 ⁇ light source 42 ⁇ light source 43 ⁇ light source 44 is turned on in this order. Since the time from the application of image data to the turning on of the front light is almost the same, the front light is turned on while the pixels on the gate line 11-N are stable, improving the brightness unevenness of the entire LCD panel 11 screen. can do. Therefore, brighten A stable gradation can be realized.
- the pixel drive circuit 16 alternately displays the first image and the second image on the liquid crystal panel 11 in the same manner as described above, and the front lights 12 and the front lights 13 are alternately turned on.
- the rewriting cycle of the first image and the second image in the pixel driving circuit 16 and the lighting cycle of the front lights 12 and 13 are matched, and each cycle is set to 6 OHz or more. If this frequency is set, observer A will see the first image blinking at a frequency of 60 Hz or more, and observer B will see the second image blinking at a frequency of 60 Hz or more.
- the front light guide plate 46 has the reflection prism 46a that reflects the light emitted from the light sources 41 and 44.
- FIGS. As shown, the front light guide plate 46 has a jagged prism 46b, or the light source 41-44 is provided with a lens 6c so that the prism 46b and the lens 46c are separated from the light source 41-44. The emitted light may be made to travel substantially parallel in the front light guide plate 46.
- the force shown for rewriting the LCD panel for each gate line is shown.
- the rewriting direction is parallel to the boundary of the lighting area of the front light. If it is the direction, exactly the same action can be performed.
- a line of the color filter extends in a direction orthogonal to the reflection prism 46a in order to suppress occurrence of moire with a front light. It is desirable to place in.
- the pixel driving circuit 16 alternately displays the first image and the second image on the liquid crystal panel 11, while the pixel driving circuit 16 displays the first image while the first image is displayed. Illustrates a situation in which the light 12 is turned on and the front light 13 is turned on while the second image is displayed by the pixel driving circuit 16 .
- the second screen may be mixedly displayed on the display surface 11a of the liquid crystal panel 11, or the first screen may be mixedly displayed on the display surface lib of the liquid crystal panel 11. Therefore, in the third embodiment, the response delay is improved so that the mixture of the screens can be eliminated.
- FIG. 9 is a cross-sectional view showing a liquid crystal panel 11 of a liquid crystal display device according to Embodiment 3 of the present invention.
- a TFT (Thin Film Transistor) substrate 51 has a glass substrate 52 and a metal film (for example, (Mo, Cr), a signal line 53 such as a gate and a source, which also has a power, a TFT section 54 serving as a switch, and a pixel electrode 55 made of a transparent material such as ITO (Indium Tin Oxide). .
- a transparent material such as ITO (Indium Tin Oxide).
- the negative c-plate 57 is arranged outside the TFT substrate 51.
- the circular deflecting plate 56 is disposed outside the c-plate 57, and includes a ⁇ / 4 plate 58 and a polarizing plate 59.
- the CF substrate 61 includes a glass substrate 62 and a color filter of each color of R, G, and ⁇ , and a counter electrode 63 that also has a transparent material such as ⁇ .
- An a plate 64, a c plate 65, a ⁇ / 4 plate 66, and a polarizing plate 67 are arranged on the outer surface J of the CF substrate 61.
- An alignment film 68 of polyimide or the like is formed inside the TFT substrate 51 and the CF substrate 61, and both substrates are bonded to each other by a sealing material (not shown) applied to peripheral portions of both substrates. .
- a bend-aligned liquid crystal layer 69 is injected between the TFT substrate 51 and the CF substrate 61.
- the bend alignment refers to an alignment state in which a group of liquid crystal molecules sandwiched between the TFT substrate 51 and the CF substrate 61 is bent near the center of the liquid crystal layer 69.
- the liquid crystal panel 11 of FIG. 9 is configured by using the bend-aligned liquid crystal layer 69, the response to the change in the applied voltage is fast and quick. .
- a liquid crystal panel formed by using the bend-aligned liquid crystal layer 69 is disclosed in, for example, a document (T. Miyashita, et al., Eurodisplay '93, p. 149).
- Embodiment 3 a liquid crystal material having a birefringence anisotropy ⁇ of 0.18 (589 nm, 25 ° C.) and a dielectric anisotropy ⁇ of +8 (lkHz, 25 ° C.) is used. Therefore, the thickness (cell gap) of the liquid crystal layer 69 is set to 5.0 microns. Next, the film configuration of the liquid crystal panel 11 will be described.
- a negative c plate 57, a ⁇ / 4 plate 58, and a polarizing plate 59 are arranged outside the TFT substrate 51.
- the negative c-plate 57 is a retardation film having an in-plane retardation of approximately Onm and a negative retardation in the thickness direction.
- the ⁇ 4 plate 58 is a type of a plate having a retardation in the film plane, and has an in-plane retardation of approximately ⁇ 4.
- ⁇ is a wavelength around 550 nm at which the human eye has high visibility.
- the polarizing plate 59 transmits only linearly polarized light in a certain direction and absorbs linearly polarized light in a direction orthogonal to the direction.
- an a plate 64, a negative c plate 65, a ⁇ / 4 plate 66, and a polarizing plate 67 are arranged outside the CF substrate 61.
- the in-plane phase difference of the a-plate 64 is set to be the same as the residual phase difference of the liquid crystal layer 69 when a black display voltage is applied to the pixel, as described later.
- FIG. 10 is an explanatory diagram showing the details of the specifications of the optical film in the liquid crystal panel 11 of FIG.
- phase difference indicates the in-plane phase difference for the a plate (including ⁇ ⁇ 4 plate) and the thickness difference for the c plate, both of which are the phase difference values at a wavelength of 550 nm.
- the column of “direction” indicates the transmission axis direction for a polarizing plate, the in-plane slow axis direction for a retardation film, and the alignment direction for a liquid crystal layer.
- the right direction 3 o'clock direction
- the counterclockwise direction is defined as positive.
- the retardation films used in Embodiment 3 are all Arton films.
- the c-plate 57 Since the c-plate 57 has no in-plane phase difference, it does not have the function of changing the polarization state in the case of normal incidence.
- the a-plate 64 is disposed on the liquid crystal layer 69 side, the polarizing plate 67 and the ⁇ 4 plate 66 are also combined on the CF substrate 61 side. It does not have the function of a circularly polarizing plate.
- the liquid crystal panel 11 in FIG. 9 is in a normally white mode in which black display is performed when a high voltage is applied, and white display is performed when a low voltage is applied.
- liquid crystal molecules near the interface between the TFT substrate 51 and the CF substrate 61 do not completely rise, so that a phase difference remains in the plane.
- the a-plate 64 having the same phase difference is arranged to compensate for.
- the a-plate 64 is arranged so that the slow axis direction is orthogonal to the liquid crystal alignment direction.
- the white voltage is 2.
- the black voltage is 5.
- the in-plane phase difference of the a plate 64 is 5.lOnm, which is the same as the residual phase difference of the liquid crystal layer 69 when the OV is applied. I have.
- FIG. 11 is an explanatory diagram showing voltage-transmittance characteristics of the liquid crystal panel 11 of FIG.
- the transmittance is measured based on the intensity of the transmitted light of the liquid crystal panel when an optical film is disposed.
- FIG. 12 is an explanatory diagram showing the optical response characteristics of each pixel of the liquid crystal panel when driven at a frequency of 120 Hz.
- the response time is within several milliseconds.
- FIG. 13 is an explanatory diagram showing the reflection spectrum of the circularly polarizing plate in the liquid crystal panel 11 of FIG. 9.
- the bold line shows a TFT substrate according to the third embodiment on a glass substrate on which an aluminum metal film is deposited. It is a reflection spectrum at the time of attaching the optical film set on the 51 side.
- the reflectance is based on the reflectance of a glass substrate with aluminum without a film. Compared to the reflectance of the polarizing plate alone (the thin line in the figure), the reflectance especially near the wavelength of 560 nm is suppressed.
- the force polarizing plate 59 shown in FIG. A ⁇ 2 plate may be inserted between the ⁇ 4 plate 58 and between the polarizing plate 67 and the ⁇ 4 plate 66, respectively.
- the ⁇ 2 plate is also a type of a-plate, and is an optical film having a phase difference of approximately ⁇ Z2. Combining three polarizing plates, a ⁇ 2 plate and a ⁇ 4 plate, results in a broadband circularly polarizing plate.
- the ⁇ 2 plate has a function of rotating the polarization direction of the linearly polarized light transmitted through the polarizing plate by twice the angle formed by the polarizing plate transmission axis and the ⁇ 2 plate slow axis.
- the linearly polarized light transmitted through the ⁇ 2 plate becomes circularly polarized light by the ⁇ 4 plate, as in the third embodiment.
- the function of a circularly polarizing plate can be provided in a wider wavelength range.
- FIG. 14 is an explanatory diagram showing the details of the specifications of the optical film in the liquid crystal panel 11 of FIG.
- FIG. 15 is an explanatory view showing the reflection spectrum of the circularly polarizing plate in the liquid crystal panel 11 of FIG. 9.
- the bold line shows the TFT substrate of the third embodiment on a glass substrate on which an aluminum metal film is deposited. It is a reflection spectrum when a set of optical films on the 51 side is stuck.
- the reflectivity is based on the reflectivity of a glass substrate with aluminum without a film, and is lower than the reflectivity of a polarizing plate alone (the thin line in the figure) over a wide band.
- the phenomenon that the first image for the observer ⁇ is mixed with the second image for the observer ⁇ can be seen. Can not be. Further, the phenomenon that the second image for the observer B is mixed with the first image for the observer A is no longer observed. Thereby, good visibility is obtained for both observers. Since the circularly polarizing plate 56 is arranged outside the TFT substrate 51 of the liquid crystal panel 11, the optical power from the front light for the observer A arranged on the TFT substrate 51 side The signal wiring on the TFT substrate 51 The phenomenon of reflection at 53 is suppressed, and good visibility is obtained for the observer B on the TFT substrate 51 side.
- the alignment of the liquid crystal layer 69 constituting the liquid crystal panel 11 is the bend alignment.
- the alignment of the liquid crystal layer 69 may be an alignment similar to the bend alignment.
- the configuration of the optical film disposed on the liquid crystal panel 11 is not limited to the configurations of the third and fourth embodiments.
- a biaxial film having both in-plane retardation and thickness-direction retardation is used instead of the ⁇ / 4 plate 58 and the c-plate 57. Is also good. Further, an a plate and a biaxial film, a biaxial film and a c plate, or a plurality of biaxial films may be used.
- a combination using a biaxial film instead of the ⁇ 4 plate 66 and the c plate 65, or the c plate 65 and the a plate 64 may be used! /.
- the surface of the polarizing plate be subjected to anti-reflection treatment on the CF substrate 61 and the TFT substrate 51 in order to suppress reflection of light emitted from the front light.
- the force shown in the case where the orientation of the liquid crystal layer 69 forming the liquid crystal panel 11 is the bend orientation
- the orientation of the liquid crystal layer forming the liquid crystal panel 11 may be substantially parallel.
- FIG. 16 is a cross-sectional view showing a liquid crystal panel 11 of a liquid crystal display device according to Embodiment 6 of the present invention.
- the same reference numerals as in FIG. 9 denote the same or corresponding parts, and a description thereof will not be repeated. Abbreviate.
- a circular deflecting plate 56 is configured by using a ⁇ 4 plate 58 instead of the c-plate 57 and using a ⁇ 2 plate 71 instead of the ⁇ 4 plate 58.
- a ⁇ / 4 plate 66, a ⁇ 2 plate 72, and a deflection plate 67 are arranged on the CF substrate 61.
- the liquid crystal material is sandwiched between the CF substrate 61 and the TFT substrate 51 via the alignment film 68 so as to maintain a certain gap between the CF substrate 61 and the TFT substrate 51 so that the liquid crystal molecules are parallel between the upper and lower substrates.
- a laminated film is attached to the outside of the CF substrate 61 and TFT substrate 51 (see Fig. 17)
- the right direction is defined as 0 ° and the counterclockwise direction is defined as plus, and the CF substrate 6
- the angle is shown when viewed from one side.
- the polarizing plate is represented by using the transmission axis, and the ⁇ 2 plate and ⁇ 4 plate are represented by using the direction of the slow axis.
- the ⁇ ⁇ 2 plate and the ⁇ ⁇ 4 plate use a normal uniaxially stretched film, but they can be used as long as the birefringence value from the front has a predetermined value.
- a hybrid film for example, NR film
- the viewing angle characteristics can be expanded, and various retardation films must be used according to the application of the liquid crystal display device. Can be.
- the refractive index anisotropy ⁇ is 0.15 (589 ⁇ m, 25 ° C.)
- the dielectric anisotropy ⁇ is 7.6
- the birefringence power of the liquid crystal layer 69 is 50 nm.
- the white display is about 1.9 V and the black display is about 4.5 V, it is possible to display white and black using only the intermediate state of the alignment change due to the voltage application of the liquid crystal molecules. Since the response amount of the liquid crystal (the angle that changes depending on the voltage of the liquid crystal alignment) can be reduced, a high-speed response can be achieved.
- the change from white to black is about lms, and the change from black to white is about 8 ms, and the response can be made several times faster than in a normal TN mode or the like.
- the birefringence value of the liquid crystal layer 69 is in the range of 350 nm to 550 nm, good display quality obtained when the liquid crystal panel 11 of FIG. 2 is used can be obtained.
- the birefringence value of the liquid crystal layer 69 is less than 350 nm, a high-speed response display cannot be obtained by reducing the liquid crystal response amount.
- the display When the birefringence value of the liquid crystal layer 69 exceeds 550 nm, the display is colored yellow and the display quality is significantly reduced.
- the birefringence value of the liquid crystal layer 69 be in the range of 350 nm-550 ⁇ m.
- the refractive index anisotropy of the liquid crystal material is required to be in the range of 0.1-0.2.
- the birefringence value of the liquid crystal layer changes too rapidly due to the application of the voltage.
- the birefringence value of the liquid crystal layer 69 when the black display voltage or the like is applied changes, and it is not possible to obtain a stable and good display with good reproducibility.
- the refractive index anisotropy of the liquid crystal material is required to be within the range of 0.1-0.2.
- light incident from the TFT substrate 51 side passes through the polarizing plate 59 and the like and reaches the TFT substrate 51, and most of the light enters the liquid crystal layer 69 as it is.
- the light of the part is reflected by the metal film such as the signal wiring 53 provided on the TFT substrate 51 and transmitted through the polarizing plate 59 and the like again to be emitted to the lower side of the liquid crystal panel 11.
- the reflected light degrades the display quality, so that the reduction is required.
- the reaction at the signal wiring 53 and the like is The emissivity is about 30%.
- the reflectance by the signal wiring 53 can be reduced to about 10%.
- the circularly polarizing plate 56 is disposed outside the TFT substrate 51 of the liquid crystal panel 11, the light power from the front light for the observer A disposed on the TFT substrate 51 side is on the TFT substrate 51. The phenomenon of reflection on the signal wiring 53 is suppressed, and good visibility is obtained for the observer B on the TFT substrate 51 side.
- the liquid crystal alignment in the liquid crystal panel 11 is set to be parallel alignment, the refractive index anisotropy of the liquid crystal material is set in the range of 0.1-0.2, and the birefringence value is set in the range of 350 nm-550 nm. Accordingly, the movement of liquid crystal molecules when obtaining white display and black display by applying a voltage can be reduced, and response characteristics on the order of several milliseconds can be realized.
- the specification of the optical film in the liquid crystal panel 11 is the content described in FIG. 17, but the specification of the optical film in the liquid crystal panel 11 is the content described in FIG. It may be.
- the ⁇ 2 plate and the ⁇ 4 plate use a normal uniaxially stretched film. If the birefringence value from the front has a predetermined value, it can be used.
- a hybrid film for example, an NR film
- the viewing angle characteristics can be expanded, and various retardation films can be used according to the application of the liquid crystal display device.
- the characteristics of the liquid crystal material used in the seventh embodiment are such that the refractive index anisotropy ⁇ is 0.155 (589 ⁇ m, 25 ° C), the dielectric anisotropy ⁇ is 7.9, the liquid crystal layer The thickness (panel gap) is 3 m and the birefringence of the liquid crystal layer is 65 nm.
- the display is performed by setting the white display to about 1.7 V and the black display to about 4 V.
- the change from white to black is about lms, and the change from black to white is about lms.
- the response time is about 7 ms, and it can respond several times faster than normal TN mode.
- the seventh embodiment light incident from the TFT substrate 51 side passes through the polarizing plate 59 and the like and reaches the TFT substrate 51, and most of the light enters the liquid crystal layer 69 as it is.
- the light of the part is reflected by the metal film such as the signal wiring 53 provided on the TFT substrate 51 and transmitted through the polarizing plate 59 and the like again to be emitted to the lower side of the liquid crystal panel 11.
- the reflected light degrades the display quality, so that the reduction is required.
- the reflectivity at the signal wiring 53 and the like is about 30%.
- the reflectance by the signal wiring 53 can be reduced to about 10%.
- the circularly polarizing plate 56 is arranged outside the TFT substrate 51 of the liquid crystal panel 11, the optical power from the front light for the observer A arranged on the TFT substrate 51 side
- the signal wiring on the TFT substrate 51 The phenomenon of reflection at 53 is suppressed, and good visibility is obtained for the observer B on the TFT substrate 51 side.
- Embodiment 17 the force radiated from the front lights 12 and 13 in a direction perpendicular to the liquid crystal panel 11 is shown in FIG.
- the direction of light emitted from the LCD panel 11 is also inclined in the direction perpendicular to the liquid crystal panel 11, and the direction of light emitted from the front light 12 and the direction The direction of the emitted light may be shifted.
- the front lights 12 and 13 usually emit main light in a direction substantially perpendicular to the surface of the liquid crystal panel 11. This is the force that makes the liquid crystal panel 11 brightest when viewed from the front.
- the eighth embodiment is intended to improve the reduction in contrast due to the reflected light, and the main radiating direction of the radiated light of the knock lights 12 and 13 is a direction perpendicular to the liquid crystal panel 11. 5 ° to 10 ° in the opposite direction of the light sources of the knocklights 12 and 13, so that the main radiation direction of the light emitted from the knocklight 12 and the main radiation direction of the light emitted from the knocklight 13 are 10 degrees. Then 20 degrees off.
- the radiated light of the front knock light passing through the liquid crystal panel 11 is the brightest V, and unnecessary reflected light incident in the direction (emitted from the back backlight and reflected on the surface of the liquid crystal panel 11) Of the reflected light at the brightest viewing angle, the reduction in contrast due to the reflected light at the brightest viewing angle is suppressed, and a bright, high-contrast display can be achieved.
- the surfaces of the light guide plates of the knock lights 12 and 13 opposite to the liquid crystal panel have a small angle of 0 to 5 degrees on the light source side and 40 degrees on the opposite side of the light source, as shown in FIG.
- a triangular reflecting prism with an angle of 50 degrees may be formed.
- the angle of the reflection prism on the side opposite to the light source is set to approximately 40 to 43 degrees
- the surface of the light guide plate With respect to the normal line of the surface of the liquid crystal panel 11
- light inclined by 10 degrees to 4 degrees is emitted toward the opposite light source side.
- light is also emitted with a 10 degree force and 4 degrees tilt to the light source side.
- the efficiency is reduced because a large amount of light leaks to the prism surface side of the light guide plate.
- the main emission direction of the light emitted from the two backlights 12 and 13 is 8 degrees from the direction perpendicular to the liquid crystal panel 11 to the direction opposite to the light sources of the backlights 12 and 13.
- the main radiating direction of the radiated light of the knock light 12 and the main radiating direction of the radiated light of the knock light 13 are shifted by 16 degrees.
- the angle of the reflection prism on the light guide plate on the side opposite to the light source is set to approximately 40 to 43 degrees
- the light source is arranged on the hinge side
- the inside knock light, which becomes outside when folded is: It is desirable to set the angle of the reflection prism of the light guide plate on the side opposite to the light source to approximately 40 to 43 degrees, and to arrange the light source on the side opposite to the hinge.
- the liquid crystal display device provides a liquid crystal panel having two display surfaces when mounted on an information device such as a mobile phone, a personal digital assistant (PDA), and a wristwatch. It is suitable for an image in which an image different from the image displayed on one display surface needs to be displayed on the other display surface.
- an information device such as a mobile phone, a personal digital assistant (PDA), and a wristwatch. It is suitable for an image in which an image different from the image displayed on one display surface needs to be displayed on the other display surface.
Abstract
Description
Claims
Priority Applications (2)
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US10/585,201 US7903080B2 (en) | 2004-02-13 | 2005-02-09 | Liquid crystal display including a liquid crystal panel having two screens |
JP2005517955A JP4558651B2 (ja) | 2004-02-13 | 2005-02-09 | 液晶表示装置及び情報機器 |
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JP (1) | JP4558651B2 (ja) |
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- 2005-02-09 WO PCT/JP2005/001949 patent/WO2005078514A1/ja active Application Filing
- 2005-02-09 JP JP2005517955A patent/JP4558651B2/ja not_active Expired - Fee Related
- 2005-02-09 US US10/585,201 patent/US7903080B2/en not_active Expired - Fee Related
- 2005-02-09 CN CNB2005800047350A patent/CN100504520C/zh not_active Expired - Fee Related
- 2005-02-09 CN CN200910004448XA patent/CN101493607B/zh not_active Expired - Fee Related
- 2005-02-09 KR KR1020067016116A patent/KR100822520B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
KR20060106859A (ko) | 2006-10-12 |
CN101493607A (zh) | 2009-07-29 |
JPWO2005078514A1 (ja) | 2007-10-18 |
US7903080B2 (en) | 2011-03-08 |
US20080297431A1 (en) | 2008-12-04 |
CN100504520C (zh) | 2009-06-24 |
KR100822520B1 (ko) | 2008-04-16 |
CN1942810A (zh) | 2007-04-04 |
JP4558651B2 (ja) | 2010-10-06 |
CN101493607B (zh) | 2011-04-20 |
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