WO2008018212A1 - Dispositif d'affichage à cristaux liquides et module de commande de l'angle de visualisation - Google Patents
Dispositif d'affichage à cristaux liquides et module de commande de l'angle de visualisation Download PDFInfo
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- WO2008018212A1 WO2008018212A1 PCT/JP2007/058252 JP2007058252W WO2008018212A1 WO 2008018212 A1 WO2008018212 A1 WO 2008018212A1 JP 2007058252 W JP2007058252 W JP 2007058252W WO 2008018212 A1 WO2008018212 A1 WO 2008018212A1
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- liquid crystal
- viewing angle
- angle control
- display device
- crystal panel
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
- G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
-
- 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
-
- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation
Definitions
- Liquid crystal display device and viewing angle control module Liquid crystal display device and viewing angle control module
- the present invention relates to a display device (for example, a liquid crystal display device) capable of switching viewing angle characteristics.
- a display device for example, a liquid crystal display device
- a display device In general, a display device is required to have a viewing angle characteristic (wide viewing angle characteristic) that enables a clear image to be seen from a larger number of viewpoints.
- a viewing angle characteristic wide viewing angle characteristic
- the display content is visible only to the user himself / herself.
- notebook personal computers, personal data assistants (PDAs), or mobile phones may be used in places where an unspecified number of people may exist, such as in trains or airplanes. high.
- the display image can be viewed only by the person (from a limited viewpoint) and cannot be viewed from the surrounding area (from other viewpoints). It is desirable to have angular characteristics (narrow viewing angle characteristics).
- a viewing angle control liquid crystal panel is provided above the display liquid crystal panel, and these panels are sandwiched between two polarizing plates to control the viewing angle.
- a liquid crystal display device that controls the viewing angle characteristics by adjusting the voltage applied to the LCD panel! Speak.
- Patent Document 1 Japanese Patent Laid-Open No. 10-268251 (published on October 9, 1998)
- the viewing angle control liquid crystal panel and the upper liquid crystal panel are arranged in accordance with the rubbing direction of the substrate constituting the display liquid crystal panel (or the direction of the deflection axis of the lower deflection plate). It is necessary to arrange a deflection plate. In other words, depending on the liquid crystal panel for display, the visible direction and the non-visible direction (viewing restricted direction) at the time of narrow viewing angle characteristics The problem is that the visibility limit direction cannot be set freely.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of arbitrarily setting a viewing restriction direction.
- the present liquid crystal display device includes a display liquid crystal panel and a viewing angle control liquid crystal panel, and is a liquid crystal display device capable of switching viewing angle characteristics.
- a retardation member for setting a viewing restriction direction is provided between the liquid crystal panel for viewing and the liquid crystal panel for viewing angle control.
- the display liquid crystal panel is configured by stacking a first deflecting member, a display liquid crystal cell, and a second deflecting member in this order, and the viewing angle controlling liquid crystal.
- the panel is formed by stacking a third deflection member, a viewing angle control liquid crystal cell, and a fourth deflection member in this order, and the retardation member is arranged between the second and third deflection members. It is good also as the structure currently made.
- the retardation member may be a 1Z2 wavelength plate ( ⁇ 2 ⁇ plate).
- the angle between the transmission axis of the second deflecting member and the axis of the 1Z2 wave plate is equal to the angle between the axis of the 1Z2 wave plate and the third deflecting member. Arrange it so that it is equal to the angle formed by the axis. By doing so, it is possible to change the polarization direction (polarization axis direction) of the linearly polarized light transmitted through the display liquid crystal panel while maintaining its intensity.
- a retardation plate is further provided between at least one of the first deflection member and the display liquid crystal cell and between the second deflection member and the display liquid crystal cell. May be. Further, a retardation plate may be further provided at least between the third deflection member and the viewing angle control liquid crystal cell and between the fourth deflection member and the viewing angle control liquid crystal cell. good.
- a display liquid crystal panel may be provided between the backlight and the viewing angle control liquid crystal panel, or the backlight and the display liquid crystal panel may be provided.
- a viewing angle control liquid crystal panel may be provided between the two.
- the light emitted from the knocklight has directivity.
- the viewing angle control module of the present invention is a viewing angle control module that constitutes a liquid crystal display device capable of switching viewing angle characteristics by being combined with a display liquid crystal panel.
- a phase difference member for setting a viewing restriction direction and a liquid crystal panel for viewing angle control are arranged in order of the panel side force.
- the phase difference member can change the polarization direction (direction of the polarization axis) of linearly polarized light transmitted through the display liquid crystal panel or the viewing angle control liquid crystal panel.
- the viewing limit direction by the viewing angle control liquid crystal panel can be changed. That is, it is possible to arbitrarily set the viewing restriction direction by appropriately setting the axis using an appropriate phase difference member.
- the viewing angle control liquid crystal panel may be configured by stacking the first deflection member, the viewing angle control liquid crystal cell, and the second deflection member in this order. Good.
- the retardation member may be a 1Z2 wavelength plate.
- the angle formed between the axis of the 1Z2 wave plate and the axis of the first deflecting member is the angle formed by the deflection axis of the light incident on the viewing angle control module or emitted from the viewing angle control module and the axis of the 1Z2 wave plate. It is configured to be equal to the angle formed by the transmission axis. In this way, the polarization direction of the linearly polarized light transmitted through the display liquid crystal panel (direction of the polarization axis) can be changed while maintaining its intensity. [0019] It is possible to configure the retardation member by two 1Z4 wavelength plates arranged in parallel (so that the respective axes are parallel).
- an appropriate retardation member for example, a 1Z2 wavelength plate
- the polarization direction (polarization axis direction) of linearly polarized light transmitted through the liquid crystal panel for viewing or viewing angle control can be changed. As a result, it is possible to arbitrarily set the viewing restriction direction at the time of narrow viewing angle characteristics.
- FIG. 1 is an exploded perspective view showing a configuration example of the present liquid crystal display device.
- FIG. 2 is an exploded perspective view showing a configuration example of the present liquid crystal display device.
- FIG. 3 is a cross-sectional view showing a configuration of the present liquid crystal display device.
- FIG. 4 is a schematic diagram showing the action of a ⁇ 2 plate.
- FIG. 5 is a schematic diagram showing the operation of a setting phase difference plate.
- FIG. 6 is a schematic view showing the operation of the setting phase difference plate.
- FIG. 7 is a cross-sectional view showing another configuration of the present liquid crystal display device.
- FIG. 8 is a cross-sectional view showing a modification of the present liquid crystal display device.
- FIG. 9 is a cross-sectional view showing a configuration in which a setting retardation plate is attached to a viewing angle control liquid crystal panel, and a display liquid crystal panel is combined with this.
- FIG. 10 is a cross-sectional view showing a configuration in which a setting retardation plate is attached to a display liquid crystal panel, and a viewing angle control liquid crystal panel is combined with this.
- FIG. 11 is a cross-sectional view showing an arrangement example of a viewing angle control liquid crystal panel in the present liquid crystal display device.
- FIG. 12 (a) is a perspective view showing an arrangement state of liquid crystal molecules of the viewing angle control panel in the narrow viewing angle mode.
- FIG. 12 (b) is a perspective view showing an arrangement state of liquid crystal molecules of the viewing angle control panel in the wide viewing angle mode.
- FIG. 12 Fig. 12 (a) 'Models that represent two viewpoints (polar angle and azimuth angle) for the viewing angle control panel arranged in the same direction as Fig. 12 (b), and explain each of them.
- FIG. 12 (a) 'Models that represent two viewpoints (polar angle and azimuth angle) for the viewing angle control panel arranged in the same direction as Fig. 12 (b), and explain each of them.
- FIG. 14 (a) is a diagram showing the positional relationship between liquid crystal molecules and the transmission axis of a polarizing plate when viewed from the viewpoint.
- FIG. 14 (b) Viewpoint P force Diagram showing the positional relationship between the liquid crystal molecules and the transmission axis of the polarizing plate.
- FIG. 14 (c) Viewpoint P force A diagram showing the positional relationship between the liquid crystal molecules and the transmission axis of the polarizing plate.
- FIG. 15 is a chart showing viewing angle characteristics (polarity and azimuth dependence of luminance distribution) in narrow viewing angle mode.
- FIG. 16 is a chart showing viewing angle characteristics (polarity dependence and azimuth angle dependence of luminance distribution) in wide viewing angle mode.
- FIG.17 Cross section showing a configuration in which one ⁇ 4 plate is mounted on the upper surface of the LCD panel for display and one ⁇ 4 plate is mounted on the lower surface of the LCD panel for viewing angle control.
- FIG. 3 is a cross-sectional view illustrating a schematic configuration of the present liquid crystal display device 10.
- the present liquid crystal display device 10 includes a display liquid crystal panel 1 for displaying an image, a viewing angle control liquid crystal panel 2 for switching the viewing angle characteristics of the liquid crystal display device 10, and a display liquid crystal panel. 1 and a viewing angle control liquid crystal panel 2 provided with a setting phase difference plate (1Z2 ⁇ plate) 7 and a backlight 3 for setting a viewing restriction direction.
- a first deflection plate 13 a display liquid crystal cell 11 having a liquid crystal sandwiched between a pair of translucent substrates, and a second deflection plate 12 are arranged in this order for viewing angle control.
- a third deflection plate 23 a viewing angle control liquid crystal cell 21 with a liquid crystal sandwiched between a pair of translucent substrates, and a fourth deflection plate 22 are arranged in this order.
- a setting phase difference plate 7 is disposed between the first deflection plate 23 and the third deflection plate 23.
- the liquid crystal display device 10 has a wide viewing angle mode (wide viewing angle characteristics) in which an image on the display liquid crystal panel 1 can be viewed from more viewpoints by switching operation of the liquid crystal included in the viewing angle control liquid crystal cell 21.
- a narrow viewing angle mode narrow viewing angle characteristics in which the image on the display liquid crystal panel 1 can be visually recognized with a limited viewpoint can be achieved.
- the narrow viewing angle mode is suitable when you do not want other people to view the image on the LCD panel 1 for display.
- the wide viewing angle mode is for viewing images on the LCD panel 1 for normal use or for multiple people at the same time. Suitable for cases.
- the liquid crystal mode, cell structure, and drive mode of the display liquid crystal panel 1 are arbitrary. sand That is, any liquid crystal panel (for example, a TN liquid crystal panel or an ASV liquid crystal panel) that can display characters, images, or moving images can be used as the display liquid crystal panel 1.
- the display liquid crystal panel 1 may be a transflective liquid crystal panel.
- the display liquid crystal panel 1 may be a panel capable of color display or a panel dedicated to monochrome display.
- the configuration of the backlight 3 is also arbitrary. For example, a backlight that emits light having directivity can be used.
- the liquid crystal layer of the viewing angle control liquid crystal cell 21 is made of, for example, a homogeneous nematic liquid crystal force. Further, the second deflection plate 12 has a surface subjected to diffusion treatment such as AG treatment. The first deflecting plate 13 is a so-called clear polarizing plate that is not subjected to surface treatment.
- FIGS. 12 (a) and 12 (b) are schematic diagrams mainly showing the configuration of the viewing angle control liquid crystal panel 2.
- FIG. 12 (a) shows a viewing angle control liquid crystal cell in the narrow viewing angle mode.
- FIG. 12 (b) shows the alignment state of the liquid crystal molecules in the viewing angle control liquid crystal cell 21 in the wide viewing angle mode.
- the viewing angle control liquid crystal cell 21 includes a pair of translucent substrates 21a '21b. Transparent electrodes (not shown) are formed on the respective surfaces of the translucent substrates 21a '21b using, for example, ITO (Indium Tin Oxide).
- the display liquid crystal cell 11 has an electrode structure corresponding to the display unit because it is necessary to drive the liquid crystal in a display unit such as a pixel unit or a segment unit.
- the viewing angle control liquid crystal cell 21 is not limited with respect to the electrode structure.
- a uniform transparent electrode may be formed on the entire surface of the translucent substrate 21 a ⁇ 2 lb in order to perform uniform switching over the entire display surface, or any other electrode structure may be used. obtain.
- An alignment film (not shown) for aligning the liquid crystal molecules 21c is formed on the upper layer of the transparent electrode.
- the alignment film is rubbed by a known method. 12 (a) ⁇ In FIG. 12 (b), the rubbing direction in each of the translucent substrates 21a ′ and 21b is indicated by an arrow Ra′Rb. 12 (a) 'As shown in Fig. 12 (b), is the rubbing direction Ra of the translucent substrate 21a with respect to the alignment film substantially parallel to the rubbing direction Rb of the translucent substrate 21b with respect to the alignment film? The other way around.
- the viewing angle control liquid crystal cell 21 (hereinafter abbreviated as “liquid crystal cell 21” as appropriate) is a so-called parallel cell having a twist angle of 0 (no twist).
- the liquid crystal injected into the liquid crystal cell 21 is a homogeneously aligned liquid crystal. Therefore, the liquid crystal molecules 21c of the liquid crystal cell 21 are arranged so that the molecular major axis is parallel to the substrate surface of the translucent substrate 21a ′ 21b when no voltage is applied.
- the retardation value d ′ ⁇ n (d is the thickness of the cell and ⁇ is the birefringence) of the liquid crystal layer of the liquid crystal cell 21 is, for example, 350 nm to 450 nm.
- FIG. 12 (a) shows the liquid crystal molecules 21c depending on the applied voltage V (for example, a voltage of about 2.5V to 3.5V).
- Fig. 12 (b) shows the liquid crystal molecules 21c depending on the applied voltage V (for example, a voltage of 5. OV or more).
- a third polarizing plate 23 provided below the liquid crystal cell 21 and a fourth polarizing plate 22 provided above the liquid crystal cell 21 are arranged so that the transmission axis X and the transmission axis X force are substantially orthogonal to each other.
- the transmission axis X of the fourth polarizing plate 22 is the translucent substrate
- It has an inclination of 40 ° to 50 ° (preferably 45 °) with respect to the rubbing direction R with respect to the alignment film of 21a.
- the viewing angle control panel 2 is used with reference to FIG. 13 and FIG. 14 (a) to FIG. 14 (c).
- the principle of switching the viewing angle characteristics of the liquid crystal display device 10 between the wide viewing angle mode and the narrow viewing angle mode will be described.
- the following In the description, a certain viewpoint with respect to the viewing angle control panel 2 is represented by an azimuth angle ⁇ and a polar angle ⁇ with respect to the center of the fourth polarizing plate 22.
- the azimuth angle ⁇ is the rotation angle of the line connecting the leg of the perpendicular line dropped from the viewpoint to the plane including the surface of the fourth polarizing plate 22 and the center 22c of the fourth polarizing plate 22, and the polar angle ⁇ is The angle between the straight line connecting the center 22c of the fourth polarizing plate 22 and the viewpoint is the normal to the fourth polarizing plate 22.
- FIG. 13 shows three viewpoints P to P with respect to the viewing angle control panel 2 arranged in the same direction as that shown in FIG. 12 (a) ′ and FIG. 12 (b).
- the azimuth angle ⁇ is the viewpoint P
- Fig. 15 is a chart showing the viewing angle characteristics in the narrow viewing angle mode (polarity and azimuth angle dependence of the brightness distribution), and Fig. 16 shows the viewing angle characteristics in the wide viewing angle mode (brightness distribution). It is a chart showing polar angle and azimuth angle dependency)
- the liquid crystal molecule 21c has its molecular long axis in the direction of the view point. It is in a state that is parallel to the direction from the viewpoint to the molecule.
- the linearly polarized light transmitted through the third polarizing plate 23 and incident into the liquid crystal cell 21 toward the viewpoint P is not given birefringence by the liquid crystal molecules 21c and is blocked by the fourth polarizing plate 22. Therefore, the viewpoint P force is displayed in black.
- the applied voltage V to the liquid crystal cell 21 is about 2.5V to 3.5V as described above,
- the polar angle ⁇ is in the range of about 30 ° ⁇ ⁇ ⁇ 90 °, and a sufficient light-shielding state is obtained to prevent the other person from seeing.
- L to L have luminances of 50 cdZm 2 , 100 cd / m 2 , 150 cd / m 2
- the liquid crystal molecule 21c has a molecular long axis whose transmission axis X and third axis of the fourth polarizing plate 22
- the linearly polarized light that has passed through the third polarizing plate 23 and has entered the liquid crystal cell 21 with a direction toward the viewpoint P is
- the liquid crystal molecules 21 c generate extremely strong birefringence, they are shielded by the fourth polarizing plate 22. Therefore, the viewpoint P power is also displayed in black. Also, the position facing viewpoint P, that is, the direction
- the liquid crystal molecule 21c has a molecular long axis that is the transmission axis X and the fourth polarizing plate 22.
- the state is parallel to the viewpoint direction (direction from the viewpoint toward the molecule).
- the linearly polarized light that has passed through the third polarizing plate 23 and has entered the liquid crystal cell 21 toward the viewpoint P is
- the birefringence is given by the liquid crystal molecule 21c and coincides with the transmission axis X of the fourth polarizing plate 22.
- the applied voltage V is 2.5 V to 3.
- the liquid crystal cell 21 of the viewing angle control panel 2 has the molecular major axis of the liquid crystal molecule 21c. Applied voltage V that tilts the substrate normal line by a slight angle is applied! ] ( Figure 12 (a))
- the liquid crystal display device 10 can be set to a narrow viewing angle mode in which an image of the display liquid crystal panel 1 can be visually recognized only with a limited viewpoint.
- a good display can be obtained for the light that is directed toward any of the viewpoints P to P.
- the liquid crystal display device 10 can be set to a wide viewing angle mode in which an image on the display liquid crystal panel 1 can be viewed with more viewpoint power.
- L to L indicate luminances of 130 cdZm 2 , 240cd / m 2 , 35
- 2 is an equipotential line showing the distribution of each viewing angle.
- the voltage applied to the liquid crystal cell 21 of the viewing angle control panel 2 is switched in at least two stages of the applied voltage V or the applied voltage V.
- the viewing angle characteristics of the liquid crystal display device 10 can be switched between the wide viewing angle mode and the narrow viewing angle mode.
- the setting retardation film 7 is provided so that the direction of the transmission axis X of the third polarizing plate 23 is appropriately set, whereby the viewing restriction direction in the narrow viewing angle mode is set.
- the setting phase difference plate 7 is a ⁇ 2 ⁇ (wavelength) plate.
- the setting phase difference plate 7 does not change the intensity of the linearly polarized light Li having a polarization axis that forms an angle ⁇ with respect to the axis ⁇ of the setting phase difference plate 7. It can be converted into linearly polarized light Lo having a polarization axis that forms an angle of + to the axis A of the setting phase difference plate 7.
- the direction of the transmission axis of the third polarizing plate 23 is arbitrarily set by changing the angle formed by the axis of the setting phase difference plate 7 with respect to the transmission axis of the second polarizing plate 12. be able to.
- the azimuth angle 0 °), the viewpoint P12 (azimuth angle 90 °), and the viewpoint P14 (azimuth angle 270 °) are in the limited viewing direction, and these viewpoint powers are also displayed in black. On the other hand, a good display can be obtained from the viewpoint P13 (azimuth angle 180 °).
- the overall configuration of the present liquid crystal display device 10 in this case is shown in FIG. As shown in the figure, the setting phase difference plate 7 is arranged such that its axis A is the transmission axis X of the second deflection plate 12.
- the fourth polarizing plate 22 is
- the transmission axis X is arranged so as to be substantially orthogonal to the transmission axis X of the third deflection plate 23.
- the setting phase difference plate 7 is set with respect to the transmission axis X of the second polarizing plate 12.
- the angle can be +45 degrees with respect to the transmission axis X of the optical plate 12. This allows narrow viewing angle mode
- Viewpoint P (azimuth angle 45 °), viewpoint P (azimuth angle 225 °), and viewpoint P (direction
- Figure 1 shows the overall configuration.
- the third polarization plate 7 is arranged by arranging the setting retardation plate 7 so that its axis A forms + 22.5 ° with respect to the transmission axis X of the second polarizing plate 12.
- Board 2
- transmission axis X is set to be + 45 ° with respect to the transmission axis X of the second deflector 12.
- the fourth polarizing plate 22 has a transmission axis X that is the same as the transmission axis X of the third deflection plate 23.
- the polarization direction of the linearly polarized light (direction of the polarization axis) transmitted through the display liquid crystal panel 1 by the setting phase difference plate 7 (1Z2 wavelength plate).
- the viewing restriction direction by the viewing angle control liquid crystal panel 2 can be changed accordingly.
- the viewing restriction direction can be arbitrarily set.
- two ⁇ ⁇ 4 plates may be provided instead of the setting phase difference plate 7 ( ⁇ ⁇ 2 plate) in FIG. That is, as shown in FIG. 7, between the display liquid crystal panel 1 and the viewing angle control liquid crystal panel 2, two ⁇ ⁇ 4 plates 77a '77b are placed in parallel (with the respective axes parallel to each other). )Deploy.
- a retardation plate 25 is provided between the third polarizing plate 23 and the liquid crystal cell 21, and the liquid crystal cell 21
- a retardation plate 24 may be provided between the first polarizing plate 22 and the fourth polarizing plate 22.
- a retardation plate may be provided between the third polarizing plate 23 and the liquid crystal cell 21 or between the liquid crystal cell 21 and the fourth polarizing plate 22.
- a retardation plate 28 is provided between the first polarizing plate 13 and the liquid crystal cell 11, and the liquid crystal cell 11 and the second polarizing plate 12 are A phase difference plate 27 can be provided between them.
- the viewing angle control panel 2 is provided on the upper side of the display liquid crystal panel 1.
- the present invention is not limited to this.
- the stacking order of the display liquid crystal panel 1 and the viewing angle control panel 2 may be reversed. That is, for example, as shown in FIG. 11, a liquid crystal display device in which the viewing angle control liquid crystal panel 2 is laminated on the backlight 3 and the display liquid crystal panel 1 is further laminated thereon can be provided. .
- the liquid crystal cell 21 of the viewing angle control liquid crystal panel 2 uses a positive nematic liquid crystal that is homogenously oriented, but is not limited thereto.
- a negative type nematic liquid crystal may be used.
- negative nematic liquid crystal the behavior of liquid crystal molecules is different from that of positive nematic liquid crystal, and when no voltage is applied, the liquid crystal molecules are perpendicular to the substrate. Inclined in parallel direction. Therefore, when a wide viewing angle is used, voltage is not applied to the liquid crystal cell of the viewing angle control panel, but a predetermined voltage is applied when the viewing angle is narrow.
- the viewing angle control module 49 is configured by mounting the setting phase difference plate 7 ( ⁇ 2 plate) on the lower surface of the viewing angle control liquid crystal panel 2.
- the liquid crystal display device may be configured by combining the viewing angle control module 49 with any display liquid crystal panel 1.
- a setting phase difference plate 7 ( ⁇ 2 plate) may be mounted on the upper surface of the display liquid crystal panel 1 in advance. That is, the liquid crystal display panel 1 on which the setting phase difference plate 7 ( ⁇ 2 plate) is mounted and the viewing angle control liquid crystal panel 2 are configured separately, and the liquid crystal display device is configured by combining the two separately. May be configured.
- a setting phase difference plate 77a ( ⁇ 4 plate) is mounted on the upper surface of the brilliant display liquid crystal panel 1 and a viewing angle control liquid crystal is mounted.
- the setting phase difference plate 77b ( ⁇ 4 plate) can be attached to the bottom of panel 2, or it can be used. That is, the display liquid crystal panel 1 on which the setting phase difference plate 77b ( ⁇ 4 plate) is mounted and the viewing angle control liquid crystal panel 2 on which the setting phase difference plate 77a ( ⁇ 4 plate) is mounted are separately provided.
- This liquid crystal display device may be configured by combining the two.
- the liquid crystal display device of the present invention is suitable for a liquid crystal display device that requires privacy protection and improved security.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07741688A EP2051134A4 (en) | 2006-08-09 | 2007-04-16 | LIQUID CRYSTAL DISPLAY DEVICE AND VIEW ANGLE CONTROL MODULE |
JP2008528736A JP5037508B2 (ja) | 2006-08-09 | 2007-04-16 | 液晶表示装置 |
US12/297,922 US8045097B2 (en) | 2006-08-09 | 2007-04-16 | Liquid crystal display device and viewing angle control module |
CN2007800145070A CN101427177B (zh) | 2006-08-09 | 2007-04-16 | 液晶显示装置和视野角控制组件 |
HK09107132.5A HK1128966A1 (en) | 2006-08-09 | 2009-08-04 | Liquid crystal display device and viewing angle control module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006217408 | 2006-08-09 | ||
JP2006-217408 | 2006-08-09 |
Publications (1)
Publication Number | Publication Date |
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WO2008018212A1 true WO2008018212A1 (fr) | 2008-02-14 |
Family
ID=39032750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/058252 WO2008018212A1 (fr) | 2006-08-09 | 2007-04-16 | Dispositif d'affichage à cristaux liquides et module de commande de l'angle de visualisation |
Country Status (7)
Country | Link |
---|---|
US (1) | US8045097B2 (ja) |
EP (1) | EP2051134A4 (ja) |
JP (1) | JP5037508B2 (ja) |
KR (1) | KR20090017499A (ja) |
CN (1) | CN101427177B (ja) |
HK (1) | HK1128966A1 (ja) |
WO (1) | WO2008018212A1 (ja) |
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JP2017211645A (ja) * | 2016-05-24 | 2017-11-30 | 揚昇照明股▲ふん▼有限公司 | 複合膜及び表示装置 |
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JPWO2019103012A1 (ja) * | 2017-11-27 | 2020-12-17 | 富士フイルム株式会社 | 表示装置 |
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JP2020529627A (ja) * | 2018-01-04 | 2020-10-08 | エルジー・ケム・リミテッド | 液晶表示装置およびその製造方法 |
JP2022504376A (ja) * | 2018-11-07 | 2022-01-13 | リアルディー スパーク エルエルシー | 指向性ディスプレイ装置 |
JP2020118965A (ja) * | 2019-01-18 | 2020-08-06 | 中強光電股▲ふん▼有限公司 | 表示装置及其光源モジュール |
JP2021081465A (ja) * | 2019-11-14 | 2021-05-27 | 株式会社ジャパンディスプレイ | 表示装置及び車両用表示装置 |
WO2021095319A1 (ja) * | 2019-11-14 | 2021-05-20 | 株式会社ジャパンディスプレイ | 表示装置及び車両用表示装置 |
JP7395328B2 (ja) | 2019-11-14 | 2023-12-11 | 株式会社ジャパンディスプレイ | 車両用表示装置 |
Also Published As
Publication number | Publication date |
---|---|
CN101427177B (zh) | 2010-12-29 |
JPWO2008018212A1 (ja) | 2009-12-24 |
EP2051134A4 (en) | 2010-09-22 |
EP2051134A1 (en) | 2009-04-22 |
JP5037508B2 (ja) | 2012-09-26 |
KR20090017499A (ko) | 2009-02-18 |
US20090174843A1 (en) | 2009-07-09 |
HK1128966A1 (en) | 2009-11-13 |
CN101427177A (zh) | 2009-05-06 |
US8045097B2 (en) | 2011-10-25 |
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