WO2004072717A1 - 液晶表示装置およびこれを搭載した情報機器 - Google Patents
液晶表示装置およびこれを搭載した情報機器 Download PDFInfo
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- WO2004072717A1 WO2004072717A1 PCT/JP2004/001456 JP2004001456W WO2004072717A1 WO 2004072717 A1 WO2004072717 A1 WO 2004072717A1 JP 2004001456 W JP2004001456 W JP 2004001456W WO 2004072717 A1 WO2004072717 A1 WO 2004072717A1
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- liquid crystal
- display device
- light
- crystal display
- substrate
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0063—Means for improving the coupling-out of light from the light guide for extracting light out both the major surfaces of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
-
- 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
- G02F1/133553—Reflecting elements
- G02F1/133555—Transflectors
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- 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
Definitions
- the present invention relates to a liquid crystal display device capable of visually recognizing a display image from both front and back sides, and to an information device using the liquid crystal display device, such as a mobile phone, a personal digital assistant (PDA), and a wristwatch.
- a liquid crystal display device capable of visually recognizing a display image from both front and back sides
- an information device using the liquid crystal display device such as a mobile phone, a personal digital assistant (PDA), and a wristwatch.
- the conventional liquid crystal display device has only one display surface in each of the reflective liquid crystal display device and the transflective liquid crystal display device.
- This display device comprises a pair of first reflective polarizers, a liquid crystal sandwiched between the first absorptive polarizer, the second reflective polarizer and the second absorptive polarizer, and a light source provided on the outermost side.
- a light guide plate provided on the outermost side.
- liquid crystal display device capable of displaying on both sides and an electronic device using the same
- the liquid crystal display device when the liquid crystal display device is operated so as to display on one side, there is only one means for driving one pixel. Display cannot be performed.
- the liquid crystal display device when the liquid crystal display device is operated to display on one side, light leaks to the opposite side. In such a case, there is a problem that the display can be seen from the opposite side. I got it.
- the present invention has been made to solve the above-described problems, and provides a liquid crystal display device that can perform another display on the opposite surface even when a screen is displayed on one surface. It is aimed at. It is another object of the present invention to provide a liquid crystal display device capable of making the displayed screen invisible from the opposite side.
- the liquid crystal display device includes a first substrate and a second substrate having a pixel driving unit, in which pixels having independently driven reflection units and transmission units are arranged in a matrix.
- a liquid crystal cell comprising a liquid crystal sandwiched between a first substrate and a second substrate; a first polarizing unit disposed opposite to the first substrate; and a second polarizing unit disposed opposite to the second substrate. Since it has a first front light and a second front light arranged outside the first polarizing means and the second polarizing means, respectively, it is possible to display an image on both sides of the liquid crystal display device. It becomes possible.
- the reflection unit and the transmission unit are independently driven to display an image on both sides of the liquid crystal display device. Therefore, different images can be simultaneously displayed on both sides.
- the liquid crystal display device is characterized in that, in the second configuration, the reflective portion performs black display, so that even when only one side is displayed, light may leak to the opposite side. It is possible to make the display invisible on the opposite side.
- the reflection type liquid crystal display device is the same as the second configuration. Since the reflective portion is characterized by displaying white, it is possible to use the opposite surface as illumination when displaying only one surface.
- a reflective liquid crystal display device according to the first aspect, wherein a reflective polarizing plate is provided between the second substrate and the second polarizing means. It is possible to display a brighter display.
- An information device is an information device having display means, wherein the display means is the liquid crystal display device according to claim 1. It is possible to obtain an information device capable of displaying various types of information on a computer.
- An information device according to a seventh configuration of the present invention, in the sixth configuration, further comprising: a first main body; and a second main body having a display means and coupled to the first main body so as to be openable and closable.
- FIG. 1 is a diagram for explaining a liquid crystal display device according to a first embodiment of the present invention and an information device using the same, in which a foldable mobile phone as one of the information devices is folded.
- FIG. 2 is an external cross-sectional view partially showing a state (a state in which the second main body is closed), and FIG. 2 is a view for explaining a liquid crystal display device according to the first embodiment of the present invention and an information device using the same.
- FIG. 3 is a plan view showing the outer appearance of the liquid crystal display device according to the first embodiment of the present invention and an information device using the liquid crystal display device according to the first embodiment of the present invention. The figure explains the display operation by the transmitted light with the second body closed.
- FIG. 1 is a diagram for explaining a liquid crystal display device according to a first embodiment of the present invention and an information device using the same, in which a foldable mobile phone as one of the information devices is folded.
- FIG. 2 is an external cross-sectional view partially showing a state (a state in which
- FIG. 4 is a sectional view of a main part, and FIG. 4 is a sectional view of the liquid crystal display device according to the first embodiment of the present invention, particularly illustrating an operation at the time of display by reflected light.
- FIG. 5 is a cross-sectional view of the liquid crystal display device according to the first embodiment of the present invention, and is a cross-sectional view showing an operation of enlarging a main part of FIG. 1 and displaying an opposite surface by reflected light. .
- FIG. 6 is a plan view of a pixel portion of a liquid crystal display panel of the liquid crystal display device of the present invention.
- FIG. 7 is a sectional view of a pixel portion of a liquid crystal display panel of the liquid crystal display device of the present invention.
- FIG. 8 is a plan view of a pixel portion of a modification of the liquid crystal display panel of the liquid crystal display device of the present invention.
- a mobile phone has a first body 1 having various function switches 2 including input switches for characters and numbers, and a liquid crystal for visually displaying various information. It comprises a second body 3 having a display device 10.
- the first main body 1 and the second main body 3 are connected by a hinge 4 so as to be openable and closable.
- openings are provided on both sides of the outer surface, which becomes the outside when the second body 3 is closed, and the inner surface, which becomes the inside, and the outer transparent cover 5 is formed in the opening of the outer surface.
- An inner transparent cover 8 is provided in the side opening.
- the liquid crystal display device 10 is arranged such that the front light faces the opening on the outer surface and the opening on the inner surface. Further, the liquid crystal display device 10 operates by a signal from the drive circuit 9.
- the liquid crystal display device 10 will be described in detail with reference to FIG.
- Transparent liquid crystal 16 with first transparent electrodes 26 formed on both sides of liquid crystal 16 respectively A first substrate 15 and a transparent second substrate 17 disposed opposite to the first substrate 15 and having the second transparent electrode 23 and the reflection electrode 21 formed thereon are provided to form a liquid crystal cell. ing.
- On the surface of the first substrate 15 facing the liquid crystal 16 a first retarder 14 and a first polarizing plate 13 are sequentially installed, and on the surface of the second substrate 17 facing the liquid crystal 16.
- a second retardation plate 18 and a second polarizing plate 19 are provided in this order from the second substrate 17.
- a first front light 6 and a second front light 7 are provided outside the first polarizing plate 13 and the second polarizing plate 19, respectively.
- the first front light 6 and the second front light 7 are respectively a front light guide plate 12 having a reflecting prism 12 a formed on a surface opposite to the liquid crystal 16 and a light source 1 using, for example, a light emitting diode. It starts from one.
- the front light guide plate 12 is made of, for example, acrylic resin and Zeonor resin by injection molding.
- the first substrate 15 includes a first transparent electrode 26 formed of, for example, indium titanium oxide (ITO), and is made of a transparent material such as glass or an organic resin.
- the liquid crystal 16 sandwiched between the first substrate 15 and the second substrate 17 is made of, for example, a TN liquid crystal.
- the second substrate 17 has a reflective electrode 21 made of aluminum or silver, a second transparent electrode 23 made of, for example, ITO, and a source wiring according to a signal from a gate wiring (not shown).
- a thin-film transistor (not shown) for transmitting the potential of (not shown) to the reflective electrode 21 and the second transparent electrode 23 is formed on the same surface.
- One pixel is composed of the adjacent reflective electrode 21 and the second transparent electrode 23, and each pixel is arranged in a matrix.
- Adjacent reflective electrode 21 and second transparent electrode 23 are mutually Each is equipped with a thin film transistor (not shown), and can be controlled independently by different gate wirings.
- the first polarizing plate 13 is an absorption-type polarizing plate that transmits polarized light having a polarization plane in the transmission axis direction and absorbs polarized light having a polarization plane in the absorption axis direction different from the transmission axis direction. Further, the first retardation plate 14 is provided with a phase difference of about 1 Z 4 wavelength to transmit light.
- the second retardation plate 18 has a function of guaranteeing a phase difference of about 1/4 wavelength, and the 1Z4 wavelength and 1/2 wavelength plate are superimposed.
- the second polarizing plate 19 is an absorption-type polarizing plate, like the first polarizing plate 13. Further, in the case where the reflection polarizing plate 25 is provided, the reflection polarizing plates 25 are arranged with their transmission axes aligned so as to transmit linearly polarized light in the direction of transmission of the second polarizing plate 19 and reflect polarized light in the vertical direction.
- FIG. 6 is a plan view of a pixel formed on the second substrate 17.
- the gate wiring 41 for the reflection part, the CS wiring 42 and the gate wiring 43 for the transmission part are arranged in parallel, and the source wiring 24 is formed in a direction orthogonal to them.
- the first thin film transistor 51 is connected to the gate wiring 41 for the reflection part, the source wiring 24 and the reflection electrode 21.
- the second thin film transistor 52 of the adjacent pixel is connected to the gate wiring 43 for the transmission part, the source wiring 24 and the second transmission electrode 23.
- CS wiring 42 for applying a load capacitance to each pixel At the boundary between the reflective electrode 21 and the second transparent electrode 23 in the same pixel, there is a CS wiring 42 for applying a load capacitance to each pixel. 2 Transparent electrode 23 shares CS wiring 42.
- the same pixel shares the CS wiring 42 formed on the second electrode 17
- the number of CS wirings can be reduced. Therefore, the area of the reflective electrode 21 and the second transparent electrode 23 used for display can be increased. By doing so, a brighter display can be performed.
- the second thin film transistor 52 of the pixel adjacent to the first thin film transistor 51 is formed below the reflective electrode 21.
- FIG. 7 showing a cross-sectional structure of each pixel.
- a silicon nitride film (not shown) is formed on a second substrate 17 made of glass and subjected to waterproofing and impurity diffusion prevention treatment.
- chromium or aluminum formed by sputtering is applied using a photoengraving method.
- the gate wiring 41 for the reflection part, the gate wiring 43 for the transmission part, and the CS wiring 42 are formed at the same time.
- a silicon oxide film is formed on the entire surface as a gate oxide film 56, an amorphous silicon film is deposited, and a channel 57 between the first thin film transistor 51 and the second thin film transistor 52 is formed by photolithography.
- the chromium or aluminum formed by the sputtering is processed by photolithography to form the source wiring 24 and the drain 54 of the transistor.
- the electrode pad 60 of the storage capacitor CS for the reflection electrode is simultaneously formed.
- an ITO (Indium Tin Oxide) film which is a transparent conductive film, is deposited, and a good insulating film 56 is formed by photolithography so that the second transparent electrode 23 is connected to the drain 54 of the first transistor 51.
- the source wiring 24 and the drain 54 are formed on the same layer.
- the planarizing film 55 is transferred to the first thin film transistor 51 and the second thin film transistor.
- a flattening film 55 is formed in a region where the reflective electrode 21 is to be formed so as to cover the transistor 52 using a silicon oxide film acryl-based organic polymer material.
- a reflective electrode 21 made of aluminum or silver is formed on the flattening film 55 at a position covering the first thin film transistor 51 and the second thin film transistor 52.
- the second front light 7 is turned on with the surroundings being dark when the second main body 3 of the foldable mobile phone is closed.
- the user observes the screen from the surface of the liquid crystal display device 10 on the first front light 6 side.
- light L f1 emitted from the second front light 7 illuminates the double-sided display type liquid crystal panel 10 from behind, passes through the outer transparent cover, and reaches the user.
- the light emitted from the light source 11 of the second front light 7 diffuses and propagates through the light guide plate 12 of the second front light 7 and impinges on the reflecting prism 12 a provided on the light guide plate 12.
- the reflection prism 12a is composed of a surface having an inclination of 1 to 3 degrees and a surface having an inclination of 40 to 50 degrees with respect to the display surface of the double-sided display type liquid crystal panel 10. Light that hits a surface having an inclination of 40 to 50 degrees opposite to 11 is reflected toward the liquid crystal 16. The light becomes linearly polarized light by the second polarizing plate 19, passes through the second phase difference plate 18, and further passes through the second transmission electrode 23.
- the light changes its polarization state due to the total birefringence of the second retardation plate 18, the liquid crystal 16, and the first retardation plate 14, and is polarized by the first polarizing plate 13 ′.
- the amount of birefringence of the liquid crystal 16 can be controlled by orienting the liquid crystal 16 with an electric field formed by the second transparent electrode 23 and the first transparent electrode 26. Therefore, by applying a voltage to the second transparent electrode 23, the transmittance of the first polarizing plate 13 can be controlled, and the transmittance of the pixel corresponding to the image to be displayed can be realized.
- the light becomes linearly polarized light in the direction of the transmission axis of the first polarizing plate 13 without applying an electric field to the liquid crystal in order to increase the contrast.
- the material and thickness of the liquid crystal 16, the birefringence and direction of the first retardation plate 14 and the second retardation plate 18, so that the light becomes linearly polarized light in the direction perpendicular to the transmission axis of the plate 13, Directions are designed.
- the present invention is not limited to the above design.On the contrary, in the state where no electric field is applied, light becomes linearly polarized light in a direction orthogonal to the transmission axis of the first polarizer 13, and the voltage V h is reduced.
- the first polarizer 13 may be designed to be linearly polarized light in the transmission axis direction.
- the reflecting prism 12a of the first front light 6 is composed of a surface having an inclination of 1 to 3 degrees and a surface having an inclination of 40 to 50 degrees with respect to the display surface. % Or more passes through the first front light 6 and changes its direction slightly, but passes through the outer transparent cover 5 as it is and is visually recognized by the user.
- the reflective polarizer 25 when the reflective polarizer 25 is provided, of the reflected light reflected by the reflective prism 12a, the reflective electrode 21 and the gate wiring (not shown) ⁇ source wiring (not shown) And the reflected light from the back surface of the thin film transistor (not shown) passed through the second retardation plate 18 with a quarter-wave phase compensation function twice, and the polarization direction was rotated 90 degrees. Since the light becomes linearly polarized light, the light is reflected by the reflection polarizing plate 25 and a part of the light passes through the second transmission electrode 23. This light is anti It is linearly polarized light that is orthogonal to the light passing through the polarizer 25.
- the gate wiring, the source wiring, the thin film transistor, the reflective electrode 21 and other structural members on the glass substrate side are shielded from light with a low reflectance in order to suppress light reflection. It is effective to set functions.
- a light-shielding film except for the second transparent electrode 23 is effective to provide a light-shielding film except for the second transparent electrode 23 with a chromium oxide film, a chromium film, or the like.
- a gate wiring with a two-layer structure film made of chromium oxide with low reflectivity on the glass substrate side and aluminum to improve the conductivity of the wiring is used for the wiring, and the wiring is a source wiring, a thin film transistor or a reflective electrode. 21 1 It is provided below other structural members, and it is also possible to use gate wiring as a light shielding plate on the glass substrate side.
- the external light transmitted through the first front light 6 becomes linearly polarized light in the first polarizing plate 13.
- the light passes through the first phase difference plate 14 and the liquid crystal 16, is reflected by the reflection electrode 21, passes through the liquid crystal 16 and the first phase difference plate 14 again, and reaches the first polarizing plate.
- the polarization state of the external light changes depending on the total amount of birefringence.
- the external light passes through the first polarizing plate 13 with a transmittance according to the polarization state.
- an electric field is applied to the liquid crystal to increase the contrast.
- External light becomes linearly polarized light in the transmission axis direction of the first polarizing plate 13 when no voltage is applied, and becomes linearly polarized light in the direction perpendicular to the transmission axis of the first polarizing plate 13 when the voltage Vh is applied.
- the material and thickness of the liquid crystal 16, the birefringence amount and direction of the first retardation plate 14, and the direction of the polarizing plate are designed.
- the reflective polarizer 25 In the case where the reflective polarizer 25 is provided, external light enters from the entire surface of the double-sided display type liquid crystal panel 10, so that part of the external light passes through the first polarizer 13 and the first retardation plate 14. After that, the light is not reflected by the reflective electrode 21 and passes through the second transparent electrode 23. The external light transmitted through the second transparent electrode 23 passes through the second retardation plate 18 and reaches the reflective polarizing plate 25. At this time, when a voltage V h is applied to the second transparent electrode 23, the second transparent electrode 23 becomes linearly polarized light in a direction orthogonal to the transmission axis direction of the reflective polarizer 25, and transmits through the reflective polarizer 25. Can not be reflected.
- the reflected external light passes through the second retardation plate 18, the liquid crystal layer 16, and the first retardation plate 14, and reaches the first polarizing plate 13 again. Since the light returns to linearly polarized light in the same direction as the transmission axis of the plate 13, the light can be transmitted. Therefore, when the voltage Vh is applied to the second transparent electrode 23, it functions as a reflective electrode, and high reflectance can be expected. That is, by applying 0 V and V h to the reflective electrode 21 and the second transmissive electrode 23, respectively, for the external light on the first front light side, the reflectivity is reduced. A high white screen can be displayed.
- the foldable mobile phone has a front light that turns on the first front light 6 when the second main body 3 is determined to be open by the open / close determination means (not shown).
- the opening / closing determination means detects that the second body 3 is open by, for example, detecting the angle of the hinge 4, the first front light 6 is turned on. The light is automatically turned on, and the image displayed by illuminating the double-sided display type liquid crystal panel 10 from behind is visually recognized by the user.
- the light emitted from the light source 11 of the first front light 6 diffuses and propagates through the front light guide plate 12 of the first front light 6 and spreads, and the reflection prism 1 2a provided on the light guide plate 12 Hit.
- the reflecting prism 12a is composed of a surface having an inclination of 1 to 3 degrees and a surface having an inclination of 40 to 50 degrees with respect to the display surface of the double-sided display type liquid crystal panel 10.
- the reflected light becomes linearly polarized light on the first polarizing plate 13.
- the light passes through the first retardation plate 14 and the liquid crystal 16, and further passes through the second transmission electrode 23. Further, the light passes through the second retardation plate 18 and reaches the second polarizing plate 19. At that time, the polarization state of the light changes due to the total birefringence of the second retardation plate 18, the liquid crystal 16, and the first retardation plate 14, and is changed to the polarization state by the second polarizing plate 19. It transmits at the appropriate transmittance.
- the amount of birefringence of the liquid crystal 16 can be controlled by orienting the liquid crystal 16 with an electric field formed by the second transparent electrode 23 and the first transparent electrode 26. Therefore, by applying an appropriate voltage to the second transparent electrode 23, the transmittance of light through the second polarizing plate 19 is controlled, and the transmittance of the pixel according to the image to be displayed is realized. Can be. However, in this case, a part of the light incident from the first front light 6 is reflected by the reflection electrode 21 and leaks to the first front light 6 side. For this reason, there is a problem that the display image can be seen by a third party in front of the user.
- one pixel is constituted by the adjacent reflective electrode 21 and the second transparent electrode 23, but they are insulated from each other and can be controlled independently. Therefore, by independently controlling the voltage applied to the second transparent electrode 23 and the voltage applied to the reflective electrode 21, an image seen by the user can be seen by a third party in front of the user. Can be prevented.
- a constant voltage is applied to the reflective electrode 21, and a voltage for realizing the transmittance corresponding to the image data is applied to the second transparent electrode 23.
- the state of the liquid crystal on the reflective electrode 21 becomes uniform over the entire screen, the reflected image is not displayed, and the displayed image is not seen by a third person in front of the user.
- the liquid crystal on the second transparent electrode 23 realizes the transmittance corresponding to the image, a normal transmission image is displayed to the user.
- the reflective electrode 21 if a voltage is applied to the reflective electrode 21 so that the light reflected by the liquid crystal 16 by the reflective electrode 21 passes through the first polarizer 13, the light is output from the first front light 6.
- Light is emitted to the other side of the user. This light can also be used as illumination when shooting an object with the camera mounted on the mobile phone.
- the reflective polarizing plate 25 when an image is displayed, at the timing of applying a voltage to the second transparent electrode 23, a voltage that realizes a transmittance corresponding to the image data is applied. At that time, the amount of light transmitted through the second transmission electrode 23 and reflected from the reflective polarizer 25 is calculated from the image data, At the timing of applying a voltage to the reflective electrode 21, the voltage applied to the reflective electrode 21 is determined so that a substantially constant amount of light is reflected according to the amount of light reflected from the reflective polarizer 25. .
- the reflected image of the transmissive part is mixed with the reflected light from the reflective part, and substantially uniform reflected light is emitted from each pixel of the entire screen, so that the reflected image is not displayed and the user's image is not displayed.
- the displayed image is not visible to a third party in front.
- the present invention is not limited to this, and a first main body having various operation switches and a second main body having display means for visually displaying various information are described. If the information device has a second main unit that can be opened and closed with respect to the first main unit, for example, a folding PDA, A watch such as a wristwatch in which the first main body is fixed to the arm in a formula, a folding calculator, or the like can be similarly configured, and the same effect can be obtained.
- images displayed on the liquid crystal display device include, for example, a calendar, time, schedule, illust, face photo, game application, map, Internet HP, There are decorative patterns, illuminations, and the like.
- the images displayed on the liquid crystal display device when the second main body is open include a document creation screen, a mail operation screen, and a setting screen.
- images displayed on the liquid crystal display device when the second main body is closed include, for example, force render and time, and when the second main body is open, the image is displayed on the liquid crystal display device.
- images to be displayed include an alarm setting screen and a schedule setting screen.
- the liquid crystal display device according to the present invention is used as a display device of an information device, and the display by the same liquid crystal display device is performed in both the open state and the closed state of the second main body including the display device.
- the case where an information device capable of visually recognizing images has been described has been described.However, the present invention is not limited to this.For example, a device having a setting switch for home appliances such as a refrigerator, a microwave oven, and a cooler that is not used at all times. It can also be used as a display device that also serves as a cover that hides the setting switch in.
- liquid crystal display device allows the display image to be viewed simultaneously from both sides of the first polarizing means side and the second polarizing means side, a competitive game in which the two face each other is performed. It can also be used as a display device.
- FIG. 8 is a plan view of the structure of the thin film transistor, wiring, and electrode formed on the second substrate 17 of the present embodiment. Other configurations are the same as those in the first embodiment, and a description thereof will not be repeated.
- the first thin film transistors 51 and the second thin film transistors 52 are arranged in a staggered manner.
- the gut electrodes of the first thin film transistor 51 and the second thin film transistor 52 can be arranged so as to overlap with each other in the direction in which the reflection portion gate wiring 41 and the transmission portion gate wiring 43 extend.
- the gate electrodes are overlapped with each other, the region where the transistor is formed in the gate wiring direction can be narrowed. By doing so, the aperture ratio can be increased, and a brighter display can be performed.
- the second main body 3 is used in an open state.
- signals are independently applied to the reflective electrode 21 and the second transparent electrode 23, and different images are displayed on both sides.
- the display on the first front light 6 side is performed and the second transparent electrode 23 is driven.
- the present embodiment has been described using a mobile phone as an example, the present invention is not limited to a mobile phone, but can be applied to information devices such as PDAs and various advertising panels. Noh.
- the present embodiment is characterized in that the light sources 11 of the first and second front lights of the first embodiment are three primary colors of red, green and blue LEDs.
- the other parts are the same as those in the first embodiment, and a description thereof is omitted.
- Each of the three primary color LEDs is turned on alternately, and the liquid crystal is field-sequential so that the red transmittance display, the green transmittance display, and the blue transmittance display are synchronized with the lighting timing. Drive by the method.
- color display can be performed without using a color filter used in a liquid crystal display device that performs normal color display. Since a color filter is not used, a decrease in transmittance due to the color filter can be eliminated, and the luminance can be improved.
- a transparent liquid crystal display device can be realized, and a liquid crystal display device that looks like a transparent cover of an information terminal can be obtained.
- liquid crystal display device is of the TFT type
- LCD liquid crystal display device
- the liquid crystal display device is particularly used as a liquid crystal display device mounted on a portable device such as a mobile phone, a portable information terminal or an electronic organizer, and a liquid crystal display device displaying different images on both sides such as an advertising panel.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005504974A JP3972947B2 (ja) | 2003-02-14 | 2004-02-12 | 液晶表示装置およびこれを搭載した情報機器 |
US10/544,845 US7397521B2 (en) | 2003-02-14 | 2004-02-12 | Two sided liquid crystal display device having independently driven reflective and transmitting members for displaying both sides with different images at the same time |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-036222 | 2003-02-14 | ||
JP2003036222 | 2003-02-14 |
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WO2004072717A1 true WO2004072717A1 (ja) | 2004-08-26 |
Family
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PCT/JP2004/001456 WO2004072717A1 (ja) | 2003-02-14 | 2004-02-12 | 液晶表示装置およびこれを搭載した情報機器 |
Country Status (4)
Country | Link |
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US (1) | US7397521B2 (ja) |
JP (1) | JP3972947B2 (ja) |
CN (1) | CN100501526C (ja) |
WO (1) | WO2004072717A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JP3972947B2 (ja) | 2007-09-05 |
US20060170844A1 (en) | 2006-08-03 |
JPWO2004072717A1 (ja) | 2006-06-01 |
CN1748175A (zh) | 2006-03-15 |
US7397521B2 (en) | 2008-07-08 |
CN100501526C (zh) | 2009-06-17 |
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