WO2013011781A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

Info

Publication number
WO2013011781A1
WO2013011781A1 PCT/JP2012/065514 JP2012065514W WO2013011781A1 WO 2013011781 A1 WO2013011781 A1 WO 2013011781A1 JP 2012065514 W JP2012065514 W JP 2012065514W WO 2013011781 A1 WO2013011781 A1 WO 2013011781A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
plate
display
crystal cell
Prior art date
Application number
PCT/JP2012/065514
Other languages
English (en)
Japanese (ja)
Inventor
一義 櫻木
坂井　彰
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2013011781A1 publication Critical patent/WO2013011781A1/fr

Links

Images

Classifications

    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331—Cover glasses
    • 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
    • G02F1/133601—Illuminating devices for spatial active dimming
    • 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

Definitions

  • the present invention relates to a liquid crystal display. More specifically, the present invention relates to a liquid crystal display suitable for a portable device or digital signage.
  • a liquid crystal display is a device that displays characters and images using the electro-optical characteristics of liquid crystal molecules, and is widely used in devices such as mobile phones, notebook computers, and liquid crystal televisions.
  • liquid crystal displays have become larger in screen, and attention has been paid particularly to applications such as digital signage as displays used outdoors or semi-outdoors.
  • a protective plate for protecting the liquid crystal panel or a touch panel having a protective function is often provided on the front side of the liquid crystal panel, that is, the viewer side. .
  • the reflection that lowers the display quality is also generated inside the liquid crystal panel.
  • a wiring metal film or a pixel electrode ITO indium tin oxide, refractive index is approximately 2.0
  • a glass substrate indium tin oxide, refractive index is approximately 2.0
  • the difference in refractive index is large. Therefore, external light is reflected at the interface formed by these.
  • the liquid crystal display according to comparative example 1 is provided behind the liquid crystal panel 1010, a protective plate 1121 provided on the viewer side of the liquid crystal panel 1010 via an air layer 1140, and the liquid crystal panel 1010.
  • the liquid crystal panel 1010 includes a liquid crystal cell 1011 and a pair of polarizing plates 1112 and 1117 each including a linearly polarizing element.
  • the air layer 1140 is interposed between the liquid crystal panel 1010 and the protective plate 1121, there is a difference in refractive index between the interface between the liquid crystal panel 1010 and the air layer 1140 and the interface between the protective plate 1121 and the air layer 1140. growing. Therefore, external light is reflected at the interface, and as a result, visibility in a bright place is significantly reduced. In addition, the reflection of external light on the surface of the protection plate 1121 is large.
  • the liquid crystal display of Comparative Example 2 has a low reflection film 1118 on the viewer side of the polarizing plate 1117.
  • the liquid crystal display of Comparative Example 3 includes low reflection films 1127 and 1128 on the observer side and the liquid crystal panel 1010 side of the protective plate 1121, respectively, as shown in FIG.
  • Another method is to fill the air layer 1140 with a resin.
  • the liquid crystal display of the comparative form 4 has a resin layer 1141 filled between the protective plate 1121 and the liquid crystal panel 1010.
  • a liquid crystal display of comparative form 5 shown in FIG. 56 is conceivable.
  • a polarizing plate 1117 is attached on the protective plate 1121. Thereby, reflection of outside light can be almost eliminated.
  • the liquid crystal display of the comparative form 5 has the following disadvantages when displaying black.
  • the cause of such a phenomenon is as follows. That is, if there is an air layer 1140 between the upper and lower polarizing plates 1112, 1117, the refractive index changes at the interface between the liquid crystal cell 1011 and the air layer 1140 and at the interface between the polarizing plate 1117 and the air layer 1140. Therefore, the polarization state (for example, the traveling direction) of the light that has passed through the lower polarizing plate 1112 changes at both interfaces.
  • the display device described in Patent Document 1 includes a display panel and a protective plate disposed on the viewer side of the display panel via an air layer.
  • this display device further includes a circularly polarizing plate disposed on the observer side of the protective plate, even if a liquid crystal panel is used as the display panel, the reflection of external light can be made substantially zero.
  • a liquid crystal display having excellent visibility even in a bright place can be realized by further providing a reflective film in the display device described in Patent Document 1 and devising an arrangement place of the reflective film and the circularly polarizing plate. .
  • it can be expected to improve visibility in a bright place.
  • an air layer is present in the display device described in Patent Document 1, when a liquid crystal panel is used as the display panel, light leakage is likely to occur during black display at an oblique viewing angle, and bright spots appear during black display. Likely to happen.
  • the liquid crystal display described in Patent Document 2 includes a liquid crystal cell, and a circularly polarizing plate and a protective plate arranged on the liquid crystal cell. And when an air layer is provided between a liquid crystal cell and a protective plate, the same subject arises.
  • a liquid crystal having a structure in which the liquid crystal cell and the observer-side linear polarizing element face each other with an air layer interposed therebetween (hereinafter, such a structure is also referred to as an “air gap structure”).
  • air gap structure a structure in which the liquid crystal cell and the observer-side linear polarizing element face each other with an air layer interposed therebetween.
  • Patent Document 3 since the technique described in Patent Document 3 relates to a self-luminous display device, the above-described problem does not occur in the technique described in Patent Document 3.
  • the present invention has been made in view of the above situation, and has a structure (air gap structure) in which a liquid crystal cell and a linear polarizing element on the viewer side face each other through an air layer, and improve display quality.
  • An object of the present invention is to provide a liquid crystal display that can be used.
  • the inventors of the present invention have made various studies on a liquid crystal display that has an air gap structure and can improve display quality, and has focused on the backlight.
  • the backlight was lit even in the area where black was displayed, so that light leakage or a bright spot occurred at an oblique viewing angle. It was.
  • a backlight of a liquid crystal display having an air gap structure use a backlight whose brightness is variable according to the gradation of the liquid crystal cell, that is, the gradation of the image displayed on the screen.
  • the amount of light from the backlight can be reduced or extinguished during black display, and it has been found that light leakage and bright spots at an oblique viewing angle can be reduced, and the above problem can be solved brilliantly.
  • the present invention has been achieved.
  • a liquid crystal cell a linearly polarizing element disposed on an observer side of the liquid crystal cell via an air layer, and a back light whose brightness is variable according to the gradation of the liquid crystal cell.
  • a liquid crystal display (hereinafter also referred to as a liquid crystal display according to the present invention) that includes a light (light control BL) and does not include another polarizing element between the liquid crystal cell and the linearly polarizing element.
  • the configuration of the liquid crystal display according to the present invention is not particularly limited by other components as long as such components are formed as essential.
  • a preferred embodiment of the liquid crystal display according to the present invention will be described in detail below. Various forms shown below may be combined as appropriate.
  • the liquid crystal display according to the present invention may be a linearly polarized mode liquid crystal display that displays using linearly polarized light, or a circularly polarized mode liquid crystal display that displays using circularly polarized light. Also good.
  • the liquid crystal display according to the present invention preferably further includes a ⁇ / 4 plate disposed on the liquid crystal cell side of the linearly polarizing element.
  • the linearly polarizing element and the ⁇ / 4 plate are a first linearly polarizing element and a first ⁇ / 4 plate, respectively, and the liquid crystal display according to the present invention is disposed on the back side of the liquid crystal cell.
  • the second ⁇ / 4 plate and a second linearly polarizing element arranged on the back side of the second ⁇ / 4 plate may be further provided.
  • the liquid crystal display according to the present invention can suppress light leakage during black display due to the effect of the light control BL. Therefore, in the circularly polarized light mode, it is possible to widen the allowable range of misalignment between the observer-side and back-side polarizing plates (circularly polarizing plates). As a result, the yield can be improved.
  • a deviation from the design value in the axial (eg, absorption axis) direction of the first and second linearly polarizing elements Is an allowable range of 0.3 ° or less. Then, when the dimming BL is used, the allowable range can be expanded to about 4 °. On the other hand, a deviation of 5 ° or more from the design value is not preferable because even if the light control BL is effective, the viewing angle characteristics during black display are greatly affected.
  • the brightness of the backlight may be uniformly controlled over the entire region of the light emitting unit, but from the viewpoint of further improving display quality, the backlight is a plurality of brightnesses that are variable independently of each other.
  • An embodiment having a region (divided area) (hereinafter also referred to as a first embodiment) is preferable.
  • Preferred embodiments in the first form include the following second and third forms.
  • each of the plurality of regions is provided corresponding to one pixel.
  • each of the plurality of regions is provided corresponding to a predetermined region including a plurality of pixels.
  • the second form may be combined with the linear polarization mode, but more preferably combined with the circular polarization mode. That is, the backlight has a plurality of areas (divided areas) whose brightness is variable independently of each other, and each of the plurality of areas is provided corresponding to one pixel, and the liquid crystal according to the present invention. More preferably, the display further includes a ⁇ / 4 plate disposed on the liquid crystal cell side of the linearly polarizing element. In the dark place, the linear polarization mode and the circular polarization mode can exhibit the above-described effect (effect of preventing light leakage almost completely) in the same manner.
  • the circularly polarized mode can effectively prevent reflection of external light, the circularly polarized mode can realize high contrast in a bright place such as outdoors, but the contrast is lowered in the linearly polarized mode. . Therefore, when the circular polarization mode and the second mode are combined, the above-described effect of the second mode and the antireflection effect of external light are exhibited, so that display quality can be improved in both bright and dark places. it can.
  • the third form may be combined with the linear polarization mode, but more preferably combined with the circular polarization mode. That is, the backlight has a plurality of regions (division areas) whose brightness is variable independently of each other, and each of the plurality of regions is provided corresponding to a predetermined region including a plurality of pixels, More preferably, the liquid crystal display according to the present invention further includes a ⁇ / 4 plate disposed on the liquid crystal cell side of the linearly polarizing element.
  • the viewing angle characteristics are improved, but in general, the viewing angle of the circular polarization mode is in principle narrower than that of the linear polarization mode. For this reason, the effect of suppressing light leakage at an oblique viewing angle can be further exhibited by combining the circular polarization mode and the third mode.
  • the liquid crystal display according to the present invention may further include a protective plate or a touch panel, and the linearly polarizing element may be disposed on the protective plate or the touch panel. Thereby, the liquid crystal display according to the present invention can be used as digital signage.
  • the liquid crystal display which has a structure (air gap structure) which a liquid crystal cell and the linear polarizing element by the side of an observer oppose via an air layer, and can improve display quality is implement
  • FIG. 1 is a schematic cross-sectional view illustrating a liquid crystal display according to Embodiment 1.
  • FIG. FIG. 3 is a schematic diagram illustrating a circuit configuration of the liquid crystal display according to the first embodiment.
  • Embodiment 1 it is a schematic diagram which shows the state of a liquid crystal cell and a backlight.
  • 4 is a graph illustrating an example of a relationship between a gradation of a liquid crystal cell and a backlight output in the first embodiment.
  • it is another schematic diagram which shows the state of a liquid crystal cell and a backlight.
  • 1 is a schematic perspective view illustrating a liquid crystal display according to Embodiment 1.
  • FIG. 4 is another schematic cross-sectional view of the liquid crystal display of Embodiment 1.
  • FIG. 5 is still another schematic cross-sectional view of the liquid crystal display of Embodiment 1. It is a perspective schematic diagram which shows the liquid crystal display of the comparative form 6.
  • 6 is a schematic cross-sectional view showing a liquid crystal display according to Embodiment 2.
  • FIG. 6 is a schematic cross-sectional view showing a liquid crystal display according to Embodiment 3.
  • FIG. 6 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 4.
  • FIG. 6 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 5.
  • FIG. 7 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 6.
  • FIG. 10 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 7.
  • FIG. 10 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 8.
  • FIG. 10 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 9.
  • FIG. It is a cross-sectional schematic diagram which shows the liquid crystal display of Embodiment 10.
  • FIG. 22 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 12.
  • FIG. 16 is a schematic cross-sectional view showing a liquid crystal display of Embodiment 13.
  • FIG. 16 is a schematic cross-sectional view illustrating a liquid crystal display according to a fourteenth embodiment.
  • FIG. 16 is another schematic cross-sectional view showing the liquid crystal display of Embodiments 11 to 14.
  • FIG. 16 is another schematic cross-sectional view showing the liquid crystal display of Embodiments 11 to 14.
  • the upper part is a schematic cross-sectional view showing a simulation model M1 according to Comparative Example 7.
  • the lower part shows an equiluminance contour diagram of the simulation model M1.
  • the upper part is a schematic cross-sectional view showing a simulation model M2 according to Comparative Example 8.
  • the lower part shows an equiluminance contour diagram of the simulation model M2.
  • the upper part is a schematic cross-sectional view showing a simulation model M3 according to Comparative Example 9.
  • the lower part shows an equiluminance contour diagram of the simulation model M3.
  • the upper part is a schematic cross-sectional view showing a simulation model M4 according to Comparative Example 10.
  • the lower part shows an equiluminance contour diagram of the simulation model M4. It is a graph which shows the azimuth angle dependence of the black display brightness in the polar angle of 60 degrees of the simulation models M3 and M4.
  • the upper part is a schematic cross-sectional view showing a simulation model M5 according to Comparative Example 11.
  • the lower part shows an equiluminance contour diagram of the simulation model M5.
  • the upper part is a schematic cross-sectional view showing a simulation model M6 according to Comparative Example 12.
  • the lower part shows an equiluminance contour diagram of the simulation model M6.
  • the upper part is a schematic cross-sectional view showing a simulation model M7 according to Comparative Example 13.
  • the lower part shows an equiluminance contour diagram of the simulation model M7.
  • the upper part is a schematic cross-sectional view showing a simulation model M8 according to comparative embodiment 14.
  • the lower part shows an equiluminance contour diagram of the simulation model M8.
  • the upper part is a schematic cross-sectional view showing the simulation model M9.
  • the lower part shows an equiluminance contour diagram of the simulation model M9.
  • the upper part is a schematic cross-sectional view showing a simulation model M10 according to Comparative Example 15.
  • the lower part shows an equiluminance contour diagram of the simulation model M10.
  • the upper part is a schematic cross-sectional view showing a simulation model M11 according to Comparative Example 16.
  • the lower part shows an equiluminance contour diagram of the simulation model M11. It is a graph which shows the azimuth angle dependence of the black display brightness
  • the upper part is a schematic cross-sectional view showing a simulation model M12 according to Comparative Example 17.
  • the lower part shows an equiluminance contour diagram of the simulation model M12.
  • the upper part is a schematic cross-sectional view showing a simulation model M13 according to Comparative Example 18.
  • the lower part shows an equiluminance contour diagram of the simulation model M13. It is a graph which shows the azimuth angle dependence of the black display brightness in the polar angle of 60 degrees of the simulation models M12 and M13.
  • the upper part is a schematic cross-sectional view showing a simulation model M14 according to Comparative Example 19.
  • the lower part shows an equiluminance contour diagram of the simulation model M14.
  • the upper part is a schematic cross-sectional view showing a simulation model M15 according to Comparative Example 20.
  • the lower part shows an equiluminance contour diagram of the simulation model M15.
  • the upper part is a schematic cross-sectional view showing a simulation model M16 according to Comparative Example 21.
  • the lower part shows an equiluminance contour diagram of the simulation model M16.
  • the upper part is a schematic cross-sectional view showing a simulation model M17 according to Comparative Example 22.
  • the lower part shows an equiluminance contour diagram of the simulation model M17.
  • the opposite side of the observer is defined as the back side.
  • the azimuth (azimuth angle) of the liquid crystal display is based on the 3 o'clock direction as viewed from the observer (0 ° azimuth) when the observer looks at the screen of the display, and counterclockwise is positive. It is prescribed.
  • the linearly polarizing element has a function of extracting polarized light (linearly polarized light) that vibrates only in a specific direction from non-polarized light (natural light), partially polarized light, or polarized light.
  • the contrast of the polarizing plate including the linearly polarizing element is not necessarily infinite, and may be 5000 or more (preferably 10,000 or more).
  • the term “linearly polarizing element” or “polarizing element” in this specification refers to only an element having a polarizing function without including a protective film.
  • the ⁇ / 4 plate is a layer having a retardation of approximately 1 ⁇ 4 wavelength with respect to light having a wavelength of at least 550 nm.
  • the in-plane retardation R of the ⁇ / 4 plate is precisely 137.5 nm with respect to light having a wavelength of 550 nm, but may be 100 nm or more and 180 nm or less, preferably 120 nm or more and 160 nm or less, More preferably, they are 130 nm or more and 145 nm or less.
  • the in-plane retardation R defines the main refractive index in the in-plane direction of the birefringent layer (including the liquid crystal cell and the ⁇ / 4 plate) as nx and ny, and the main refractive index in the out-of-plane direction (thickness direction) as nz.
  • the measurement wavelength of optical parameters such as phase difference and NZ coefficient is 550 nm unless otherwise specified.
  • the birefringent layer is a layer having optical anisotropy.
  • the birefringent layer means that at least one of the in-plane retardation R and the absolute value of the thickness direction retardation Rth has a value of 10 nm or more, preferably from the viewpoint of sufficiently achieving the effects of the present invention. Means having a value of 20 nm or more.
  • the isotropic film means that both the in-plane retardation R and the absolute value of the thickness direction retardation Rth have a value of 10 nm or less, preferably 5 nm or less. Means.
  • the liquid crystal display D1 of Embodiment 1 is a transmissive liquid crystal display, and is a circular polarization mode liquid crystal display that performs display using circularly polarized light.
  • the liquid crystal display D1 includes a liquid crystal panel 10a, a front plate 20a provided on the viewer side of the liquid crystal panel 10a via an air layer 40, and a back side of the liquid crystal panel 10a. And a backlight (light control BL) 1 having a light source (not shown).
  • the liquid crystal panel 10a and the front plate 20a are bonded to each other by a sealing material provided around the display area (frame area).
  • the front plate 20a includes a protective plate 21, a polarizing plate 22a disposed on the liquid crystal panel 10a side of the protective plate 21, and a low reflection layer (antireflection layer) 26 disposed on the observer side of the protective plate 21. .
  • the polarizing plate 22a has a protective film 23 such as a triacetyl cellulose (TAC) film, a linearly polarizing element 24, and a ⁇ / 4 plate 25, and these members are laminated in this order from the protective plate 21 side. Yes.
  • a protective film 23 such as a triacetyl cellulose (TAC) film
  • a linearly polarizing element 24 and a ⁇ / 4 plate 25, and these members are laminated in this order from the protective plate 21 side. Yes.
  • Each of the protective film 23 and the ⁇ / 4 plate 25 is attached to the linearly polarizing element 24 via an adhesive layer (not shown).
  • the polarizing plate 22a functions as a circularly polarizing plate.
  • the liquid crystal panel 10a includes a liquid crystal cell 11 and a polarizing plate 12a provided on the back side (light control BL1 side) of the liquid crystal cell 11.
  • the polarizing plate 12a is affixed to the liquid crystal cell 11 via an adhesive layer or an adhesive layer (not shown).
  • No other polarizing plate (polarizing element) is provided on the viewer side of the liquid crystal cell 11, that is, between the liquid crystal cell 11 and the linearly polarizing element 24 of the polarizing plate 22a, and the polarizing plate 22a functions as an analyzer. To do.
  • the polarizing plate 12a has a ⁇ / 4 plate 15, a linearly polarizing element 14, and a protective film 13 such as a triacetyl cellulose (TAC) film, and these members are laminated in this order from the liquid crystal cell 11 side. Yes.
  • a protective film 13 such as a triacetyl cellulose (TAC) film
  • TAC triacetyl cellulose
  • Each of the protective film 13 and the ⁇ / 4 plate 15 is affixed to the linearly polarizing element 14 via an adhesive layer (not shown).
  • the polarizing plate 12a functions as a circularly polarizing plate.
  • the light control BL1 functions as a surface light source of the liquid crystal display D1, and has a light emitting portion in a region facing the liquid crystal cell 11.
  • the liquid crystal display D1 controls a circuit (liquid crystal cell driving circuit) 2 for driving the liquid crystal cell 11, a circuit (backlight driving circuit) 3 for driving the dimming BL1, and circuits 2 and 3. And a circuit (control circuit) 4 for performing the operation.
  • a circuit (liquid crystal cell driving circuit) 2 for driving the liquid crystal cell 11
  • a circuit (backlight driving circuit) 3 for driving the dimming BL1
  • circuits 2 and 3 and circuits 2 and 3.
  • a circuit (control circuit) 4 for performing the operation.
  • the control circuit 4 appropriately processes the video signal input to the liquid crystal display D1 for each frame, and represents a gradation level of each sub-pixel (for example, R, G, B sub-pixel) of the liquid crystal display D1. A signal is generated for each frame, and the generated frame signal is transmitted to the liquid crystal cell driving circuit 2.
  • the liquid crystal cell driving circuit 2 generates a voltage corresponding to the gradation level of the transmitted frame signal, and supplies the generated voltage to each subpixel for each frame. Thereby, the liquid crystal cell 11 displays an image of a predetermined gradation corresponding to the image signal.
  • control circuit 4 calculates the luminance required for the dimming BL1 for each frame based on the gradation level of the frame signal, and generates a control signal representing the luminance level (output level) of the dimming BL1 for each frame. Then, the generated control signal is transmitted to the backlight drive circuit 3.
  • the backlight drive circuit 3 controls the luminance (light emission intensity) of the dimming BL1 based on the transmitted control signal. More specifically, the backlight drive circuit 3 supplies power corresponding to the output level of the transmitted control signal to the light source of the dimming BL1 for each frame. Thereby, the light control BL1 can emit light in synchronization (synchronization) with the gradation of the image displayed on the liquid crystal cell 11 (liquid crystal display D1). That is, as shown in FIG. 3, the brightness of the light control BL1 can be changed according to the gradation ( ⁇ characteristic) of the liquid crystal cell 11 (liquid crystal display D1). For example, when the ⁇ value of the liquid crystal cell 11 is 2.2, the dimming BL1 exhibits output characteristics as shown in FIG.
  • the output of the dimming BL1 is 100% (maximum luminance), and when the gradation of the liquid crystal cell 11 is 128, the output of the dimming BL1 is 20%.
  • the output of the dimming BL1 is 0% (minimum luminance).
  • the brightness of the light control BL1 may be uniformly controlled in (1) the entire region of the light emitting unit, or (2) the light emitting unit is divided into a plurality of regions (hereinafter also referred to as divided areas). It may be controlled independently in the divided areas.
  • the divided areas may be provided corresponding to (a) each pixel, or (b) provided corresponding to a predetermined region including a plurality of pixels. According to the above (a), the brightness of the dimming BL1 can be changed in units of pixels.
  • the control circuit 4 calculates the average value of the gradation levels of all the pixels in each divided area, and generates a control signal according to the average value. Then, a control signal corresponding to the average value is transmitted to the backlight drive circuit 3, and the backlight drive circuit 3 controls the luminance of the light control BL1 according to the control signal. That is, as shown in FIG. 5, the brightness of the light control BL1 can be changed for each divided area according to the average value of the gradation of the liquid crystal cell 11 (according to the gradation of the liquid crystal cell 11). .
  • the control circuit 4 may generate a control signal based on the median value or the maximum value of the gradation levels. Can vary depending on the median or maximum value.
  • the control circuit 4 calculates the average value of the gradation levels of all the pixels in the display area, and generates a control signal according to the average value. Then, a control signal corresponding to the average value is transmitted to the backlight drive circuit 3, and the backlight drive circuit 3 controls the luminance of the light control BL1 according to the control signal. That is, the brightness of the light control BL1 can be uniformly changed over the entire region of the light emitting unit according to the average value of the gradation of the liquid crystal cell 11 (according to the gradation of the liquid crystal cell 11).
  • the control circuit 4 may generate a control signal based on the median value or the maximum value of the gradation level, and in that case, the brightness of the light control BL1 is the median value or the maximum value of the gradation of the liquid crystal cell 11. Depending on the value, it can be uniformly changed over the entire region of the light emitting section.
  • the light source of the light control BL1 is not particularly limited, and examples thereof include CCFL, LED, organic or inorganic EL, and among them, LED and organic or inorganic EL are preferable. By using these, the form (2) can be easily realized.
  • the light control BL1 may be a direct type or an edge light type.
  • the light amount of the light adjustment BL1 can be reduced or turned off during black display. Therefore, as shown in FIG. 7, at an oblique viewing angle, the amount of light emitted from the dimming BL1 decreases, or no light is emitted from the dimming BL1. Accordingly, it is possible to suppress the occurrence of light leakage during black display at an oblique viewing angle. That is, the viewing angle during black display can be improved. Further, as shown in FIG. 8, even if a minute floating substance 71 such as dust or dust is mixed in the air layer 40, the amount of light that comes out of the light control BL1 and hits the floating substance 71 can be reduced. Alternatively, the floating substance 71 can be prevented from being exposed to light. Therefore, the generation of bright spots due to the suspended matter 71 can be reduced. That is, it is possible to suppress a decrease in contrast due to the bright spot. As described above, according to the present embodiment, an air gap structure and excellent display quality can be realized.
  • the dimming BL1 corresponds to a region where white is displayed in synchronization with the display. Only the portion can emit light, and the portion corresponding to the area where black is displayed can be prevented from emitting light. Therefore, no light leakage occurs in the black display area. In the black display area, even if the floating substance 71 exists in the air layer 40, the floating substance 71 is not exposed to light, so that scattering does not occur and image quality caused by the floating substance 71 does not deteriorate. As described above, according to the form (a), it is possible to realize a very excellent display quality.
  • the polarizing plates 12a and 22a may be further provided with a viewing angle compensation film.
  • the viewing angles are compensated in the polarizing plates 12a and 22a. Therefore, it is not necessary to further provide a viewing angle compensation film on the polarizing plates 12a and 22a. Therefore, the polarizing plates 12a and 22a can be thinned and the cost can be reduced.
  • the area can be turned off. Therefore, in that area, it is possible to realize a very excellent display quality in the same manner as in the form (a). Further, if the divided area partially corresponds to the white display area, the backlight output can be reduced in the area, so that the display quality is improved.
  • the above forms (2) and (b) are more preferable than the above form (1), and the above form (a) is more preferable than the above form (b). It can be said that it is more preferable.
  • the form (b) is more preferable than the form (a). This is because in the case of the form (b), a so-called area active backlight (local dimming backlight) that is already widely used can be applied as the light control BL1.
  • the light control BL1 can suppress heat dissipation as compared with a normal backlight. Therefore, this embodiment is suitable as a liquid crystal display for digital signage. This is because in this application, it is always a problem how to suppress the temperature rise in the module.
  • this embodiment has the polarizing plates 12a and 22a which function as a circularly-polarizing plate. Therefore, reflection of external light on the surface or inside of the liquid crystal cell 11 such as the outer surface of the liquid crystal cell 11 and the surface of a member (for example, a metal film) in the liquid crystal cell can be substantially eliminated. Therefore, in a bright place, a good display quality with a wide viewing angle can be realized.
  • the present embodiment can suppress light leakage during black display due to the effect of the light control BL1. Therefore, it is possible to widen the allowable range of misalignment between the polarizing plates 12a and 22a. As a result, the yield can be improved.
  • the allowable range of deviation from the design value in the absorption axis direction of the linearly polarizing elements 14 and 24 is 0. Suppose that it was 3 degrees. If it does so, in this embodiment using light control BL1, an allowable range can be extended to about 4 degrees. On the other hand, a deviation of 5 ° or more from the design value is not preferable because even if the effect of the light control BL1 is exerted, the viewing angle characteristics during black display are greatly affected.
  • the liquid crystal display of the comparative form 6 is demonstrated.
  • the liquid crystal display of the comparative form 6 is provided with a normal backlight 101 instead of the dimming BL1, a backlight driving circuit 103 instead of the backlight driving circuit 3, and a control circuit 104 instead of the control circuit 4.
  • the liquid crystal display D1 of the first embodiment is substantially the same.
  • the control circuit 104 calculates the luminance necessary for the backlight 101, generates a control signal indicating the luminance level (output level) of the backlight 101, and transmits the generated control signal to the backlight driving circuit 103.
  • the backlight drive circuit 103 controls the luminance of the backlight 101 based on the transmitted control signal.
  • the backlight 101 emits light without depending on the gradation of the image displayed on the liquid crystal cell 11.
  • the viewing angle at the time of black display is narrow, and the light is also incident from the backlight 101 into the region displaying the low gradation. For this reason, the deterioration of the viewing angle is visually recognized, and as a result, the display quality at the oblique viewing angle is deteriorated.
  • the black display area when the suspended matter 71 exists in the air layer 40, the light from the backlight 101 hits the suspended matter 71 and scatters and appears as a bright spot. Note that reflection of external light can be prevented as in the first embodiment.
  • the front plate 20a is a transparent member disposed on the viewer side of the screen of the liquid crystal panel 10a, that is, in front of the screen, and is disposed so as to cover the screen (display area) of the liquid crystal panel 10a.
  • the polarizing plate 22a is affixed to the protective plate 21 via an adhesive layer or an adhesive layer (not shown). Which one of the adhesive and the pressure-sensitive adhesive is used may be appropriately determined in consideration of productivity. Usually, the adhesive has a very strong adhesive force, whereas the pressure-sensitive adhesive has a weaker adhesive force than the adhesive.
  • the material of the adhesive and the pressure-sensitive adhesive is not particularly limited, and examples thereof include acrylic materials.
  • the protection plate 21 is a colorless and transparent base material for protecting the liquid crystal panel 10a from various impacts.
  • a material of the protective plate 21 a material having high transparency and high mechanical strength is preferable.
  • examples include inorganic materials such as glass and tempered glass, and organic materials such as polycarbonate resin and acrylic resin. Among these, inorganic materials are preferable. It is.
  • the angle formed by the transmission axis of the linearly polarizing element 24 and the in-plane slow axis of the ⁇ / 4 plate 25 is 40 ° or more and 50 ° or less, preferably 42 ° or more and 48 ° or less, 44 More preferably, it is at least 46 ° and at most 46 °.
  • the low reflection layer 26 is not particularly limited, and examples thereof include an AR (Anti Reflection) layer having a low reflectance, an LR (Low Reflection) layer having a higher reflectance than the AR layer, and a moth-eye layer.
  • AR Anti Reflection
  • LR Low Reflection
  • the front plate 20a may further include a surface treatment layer such as a hard coat layer for preventing scratches and an AG (Anti Glare) layer for imparting antiglare properties.
  • a surface treatment layer such as a hard coat layer for preventing scratches and an AG (Anti Glare) layer for imparting antiglare properties.
  • the liquid crystal cell 11 includes a pair of substrates (not shown) and a liquid crystal layer (not shown) sandwiched between the pair of substrates.
  • the display mode of the liquid crystal cell 11 is not particularly limited and can be set as appropriate. Examples of the display mode of the liquid crystal cell 11 include a vertical alignment (VA) mode, a horizontal alignment mode, and the like.
  • the liquid crystal cell 11 preferably performs black display by aligning liquid crystal molecules in the liquid crystal layer substantially perpendicularly to the substrate surface.
  • the VA mode include a multi-domain VA (MVA) mode, a continuous pinwheel alignment (CPA) mode, a patterned VA (PVA) mode, a biased VA (BVA) mode, a reverse TN (RTN) VSne VT mode, and an InP (IPS-VA) mode and the like.
  • the pretilt angle of the liquid crystal layer is usually set to 5 ° or less when the major axis of the liquid crystal molecules is aligned in the normal direction of the substrate and defined as 0 °.
  • the pretilt angle is a tilt angle of liquid crystal molecules when no voltage is applied.
  • the liquid crystal molecules in the liquid crystal layer are aligned substantially horizontally with respect to the substrate surface when no voltage is applied.
  • the horizontal alignment mode include twisted nematic (TN) mode, in-plane switching (IPS) mode, field fringe switching (FFS) mode, and the like.
  • the pretilt angle of the liquid crystal layer is usually set to 2 ° or more.
  • the thickness direction retardation Rth ( ⁇ nd) of the liquid crystal cell 11 is set to 260 to 320 nm (preferably 290 to 310 nm). Thereby, the transmittance at the time of white display can be improved.
  • ⁇ n represents the birefringence anisotropy of the liquid crystal molecules
  • d represents the cell thickness.
  • the driving method of the liquid crystal cell 11 is not particularly limited, and a simple matrix method (passive matrix method), a plasma addressing method, or the like may be used. Of these, a TFT method (active matrix method) is preferable.
  • the angle formed by the transmission axis of the linearly polarizing element 14 and the in-plane slow axis of the ⁇ / 4 plate 15 is 40 ° or more and 50 ° or less, preferably 42 ° or more and 48 ° or less, 44 More preferably, it is at least 46 ° and at most 46 °.
  • the ⁇ / 4 plate 15 can be omitted.
  • the polarizing plates 12a and 22a are arranged in crossed Nicols. That is, the angle formed by the transmission axis of the linear polarization element 14 and the transmission axis of the linear polarization element 24 is set to approximately 90 ° (preferably 87 to 93 °, more preferably 89 to 91 °).
  • the arrangement relationship of the transmission axes of the polarizing plates 12a and 22a can be appropriately set according to the mode of the liquid crystal cell 11, and may be parallel Nicols.
  • the transmission axis of the linearly polarizing element 24 is set so as to face substantially the vertical direction when the screen of the liquid crystal display D1 is viewed from the front. More specifically, the transmission axis of the linearly polarizing element 24 is set in the range of 87 to 93 ° azimuth (preferably 89 to 91 ° azimuth).
  • linearly polarizing elements 14 and 24 examples include absorption linearly polarizing elements.
  • PVA polyvinyl alcohol
  • the ⁇ / 4 plates 15 and 25 also function as protective films that protect the linearly polarizing elements 14 and 24, respectively.
  • the NZ coefficients of the ⁇ / 4 plates 15 and 25 are not particularly limited and can be set as appropriate, but are preferably greater than 1 and 2 or less. As a result, the viewing angle characteristics can be improved, and the ⁇ / 4 plates 15 and 25 can be easily manufactured.
  • the material of the ⁇ / 4 plates 15 and 25 is not particularly limited, and for example, a stretched polymer film can be used.
  • the polymer include materials having a positive intrinsic birefringence, and more specifically, for example, polycarbonate, polysulfone, polyethersulfone, polyethylene terephthalate, polyethylene, polyvinyl alcohol, norbornene, triacetylcellulose, diacylcellulose, and the like. Is mentioned.
  • the method of forming the ⁇ / 4 plates 15 and 25 is not particularly limited, but each of the ⁇ / 4 plates 15 and 25 constitutes a circularly polarizing plate together with the linearly polarizing elements 14 and 24, and therefore approximately 45 with the linearly polarizing elements 14 and 24. Laminated at a relative angle of °. Therefore, it is particularly preferable that the ⁇ / 4 plates 15 and 25 are formed using an oblique stretching method in which stretching and orientation is performed in an oblique direction with respect to the flow direction of the roll film.
  • the ⁇ / 4 plates 15 and 25 are preferably adjacent to the linearly polarizing elements 14 and 24, respectively. That is, it is preferable that no birefringent layer is provided between the ⁇ / 4 plate 15 and the linearly polarizing element 14, and no birefringent layer is provided between the ⁇ / 4 plate 25 and the linearly polarizing element 24. It is preferable. Accordingly, a desired circularly polarizing plate can be easily configured by the ⁇ / 4 plate 15 and the linearly polarizing element 14, and a desired circularly polarizing plate can be easily configured by the ⁇ / 4 plate 25 and the linearly polarizing element 24.
  • an isotropic film may be disposed between at least one of the ⁇ / 4 plate 15 and the linearly polarizing element 14 and between the ⁇ / 4 plate 25 and the linearly polarizing element 24.
  • the slow axis of the birefringent layer is substantially parallel to the transmission axis of the linearly polarizing element 14 or By setting the direction to be substantially orthogonal, the birefringence function of the birefringent layer is substantially invalidated, and no birefringent layer is provided between the ⁇ / 4 plate 15 and the linearly polarizing element 14 Similar effects can be obtained.
  • the slow axis of the birefringent layer is substantially parallel to the transmission axis of the linearly polarizing element 24.
  • the birefringence function of the birefringent layer is substantially invalidated by setting the direction substantially orthogonal, and no birefringent layer is provided between the ⁇ / 4 plate 25 and the linearly polarizing element 24. The same effect can be obtained.
  • substantially parallel means that the angle between both axes is preferably in the range of 0 ° ⁇ 3 °, more preferably in the range of 0 ° ⁇ 1 °, Is preferably in the range of 90 ° ⁇ 3 °, more preferably in the range of 90 ° ⁇ 1 °.
  • the liquid crystal display D1 may be a transflective liquid crystal display.
  • the air layer 40 provides a space in which the front plate 20a is deformed when an external force is applied to the front plate 20a.
  • the external force is dispersed and absorbed by the deformation of the front plate 20a, and as a result, the liquid crystal panel 10a is protected.
  • the thickness of the air layer 40 can be appropriately set according to the use environment of the liquid crystal display D1. For example, if it is a semi-indoor with good environmental conditions (environment in which changes in temperature and humidity are small and abrasion resistance is not required), it may be a relatively small thickness (for example, 1 mm) used in mobile applications. . In addition, if it is completely outdoors (environment in which changes in temperature and humidity are large and abrasion resistance is required) under poor environmental conditions, it is necessary to cool the liquid crystal panel 10a, so that the thickness can be circulated (for example, 50 mm). ) Is preferably set.
  • An isotropic film may be present between the liquid crystal cell 11 and the polarizing plate 22a. Further, there may be a birefringent layer between the liquid crystal cell 11 and the polarizing plate 22a. In this case as well, the slow axis of the birefringent layer is substantially parallel or substantially orthogonal to the transmission axis of the linearly polarizing element 24. By substantially setting the birefringence function of the birefringent layer, the same effect as when no birefringent layer is provided between the liquid crystal cell 11 and the polarizing plate 22a is obtained. Can do.
  • substantially parallel means that the angle between both axes is preferably in the range of 0 ° ⁇ 3 °, more preferably in the range of 0 ° ⁇ 1 °, The angle formed by both axes is preferably in the range of 90 ° ⁇ 3 °, more preferably in the range of 90 ° ⁇ 1 °.
  • the liquid crystal display D2 of the second embodiment is substantially the same as the liquid crystal display D1 of the first embodiment, except that a front plate 20b is provided instead of the front plate 20a.
  • the front plate 20b is the same as the front plate 20a except for the following points.
  • the front plate 20b further includes an antireflection film 32 in addition to the members included in the front plate 20a.
  • the antireflection film 32 has a base film 27 and a low reflection layer (antireflection layer) 28 formed on the base film 27.
  • the antireflection film 32 is an adhesive layer or an adhesive layer (not shown). ) To the polarizing plate 22a.
  • the base film 27 functions as a base for the low reflective layer 28.
  • the light that has exited the light adjustment BL1 and passed through the liquid crystal panel 10a is reflected on the surface of the polarizing plate 22a, and further reflected on the surface or inside of the liquid crystal cell 11, thereby the front plate 20a. May pass through. In that case, there is a possibility that multiple reflections of the display occur.
  • the low reflection layer 28 is provided on the surface of the front plate 20b on the liquid crystal panel 10a side. Therefore, it is possible to effectively suppress the light that has exited the light adjustment BL1 and passed through the liquid crystal panel 10a from being reflected on the surface of the front plate 20b on the liquid crystal panel 10a side. Therefore, it is possible to reduce display multiple reflections.
  • the low reflection layer 28 is not particularly limited, and examples thereof include an AR layer having a low reflectance, an LR layer having a higher reflectance than the AR layer, and a moth-eye layer.
  • the front plate 20b is very easy to handle as compared with the case where the low reflection layer 28 is formed on the ⁇ / 4 plate 25.
  • the in-plane retardation of the base film 27 is preferably 10 nm or less (more preferably 5 nm or less), and the thickness direction retardation of the base film 27 is 20 nm or more and 80 nm or less (more preferably 30 nm or more). 60 nm or less).
  • triacetyl cellulose As a material of the base film 27, triacetyl cellulose (TAC) is suitable, and the base film 27 is preferably a TAC film.
  • the liquid crystal display D3 of the third embodiment is substantially the same as the liquid crystal display D1 of the first embodiment except that a front plate 20c is provided instead of the front plate 20a.
  • the front plate 20c is the same as the front plate 20a except that it includes a polarizing plate 22b instead of the polarizing plate 22a.
  • the polarizing plate 22b is the same as the polarizing plate 22a except that a biaxial film (-AC plate) 29 is further provided between the linear polarizing element 24 and the ⁇ / 4 plate 25.
  • a biaxial film (-AC plate) 29 is further provided between the linear polarizing element 24 and the ⁇ / 4 plate 25.
  • the in-plane retardation R and NZ coefficient of the biaxial film 29 are, for example, 115 nm and ⁇ 0.4, respectively.
  • the in-plane slow axis of the biaxial film 29 is arranged in parallel with the absorption axis of the linearly polarizing element 24.
  • a stretched polymer film such as a polystyrene film can be used.
  • the biaxial film 29 is produced by biaxially stretching the material (polymer film). It is preferable.
  • the polarizing plate (circular polarizing plate) 22b can be widened.
  • the liquid crystal display D4 of the fourth embodiment is substantially the same as the liquid crystal display D3 of the third embodiment except that a front plate 20d is provided instead of the front plate 20c.
  • the front plate 20d is substantially the same as the front plate 20c except for the following points.
  • the front plate 20d further includes the above-described antireflection film 32 in addition to the members included in the front plate 20c.
  • the liquid crystal display D5 of the fifth embodiment is substantially the same as the liquid crystal display D1 of the first embodiment except that a front plate 20e is provided instead of the front plate 20a.
  • the front plate 20e is substantially the same as the front plate 20a except that the polarizing plate 22a is disposed between the protective plate 21 and the low reflection layer 26. That is, in the present embodiment, the polarizing plate 22 a is disposed on the observer side of the protective plate 21.
  • the polarizing plate 22a is provided on the front plate 20e, and also in this embodiment, the air layer 40 exists between the linearly polarizing element 14 and the linearly polarizing element 24 as in the first embodiment. Therefore, according to the present embodiment, as in the first embodiment, excellent display quality can be realized.
  • the polarizing plate 22a may further include a viewing angle compensation film for the circular polarization mode.
  • the liquid crystal display D6 of the sixth embodiment is substantially the same as the liquid crystal display D5 of the fifth embodiment except that a front plate 20f is provided instead of the front plate 20e.
  • the front plate 20f is substantially the same as the front plate 20e except for the following points.
  • the front plate 20f further includes the above-described antireflection film 32 in addition to the members included in the front plate 20e.
  • the antireflection film 32 is affixed to the surface of the protective plate 21 on the liquid crystal panel 10a side via an adhesive layer or an adhesive layer (not shown).
  • the liquid crystal display D7 according to the seventh embodiment includes a front plate 20g instead of the front plate 20a and a liquid crystal panel 10b instead of the liquid crystal panel 10a. Is substantially the same.
  • the front plate 20g is substantially the same as the front plate 20a except that the front plate 20g includes a polarizing plate 22c instead of the polarizing plate 22a.
  • the polarizing plate 22 c is substantially the same as the polarizing plate 22 a except that it has a biaxial film ( ⁇ AC plate) 30 instead of the ⁇ / 4 plate 25.
  • the liquid crystal panel 10b is substantially the same as the liquid crystal panel 10a except that it includes a polarizing plate 12b instead of the polarizing plate 12a.
  • the polarizing plate 12b is substantially the same as the polarizing plate 12a except that it includes a biaxial film (-AC plate) 16 instead of the ⁇ / 4 plate 15.
  • a biaxial film (-AC plate) 16 instead of the ⁇ / 4 plate 15.
  • the in-plane retardation R and the NZ coefficient of the biaxial films 16 and 30 are, for example, 55 nm and 2.77, respectively.
  • the in-plane slow axes of the biaxial films 16 and 30 are arranged in parallel with the absorption axes of the linearly polarizing elements 14 and 24, respectively.
  • the liquid crystal display D7 is a linear polarization mode liquid crystal display that performs display using linearly polarized light, and performs display using the polarizing plates 12b and 22c that function as linearly polarizing plates.
  • an air layer 40 exists between the linearly polarizing element 14 and the linearly polarizing element 24. Therefore, also in the present embodiment, similarly to the first embodiment, light leakage at the time of black display can be suppressed at an oblique viewing angle, and the occurrence of bright spots can be reduced.
  • the present embodiment performs display using the polarizing plates 12b and 22c that function as linear polarizing plates, it is darker than the first embodiment that performs display using the polarizing plates 12a and 22a that function as circular polarizing plates. Visibility at the place can be improved. Furthermore, as the polarizing plates 12b and 22c, a linear polarizing plate with a biaxial film that is already widely used can be used.
  • the present embodiment includes the polarizing plates 12b and 22c that function as linear polarizing plates, reflection of external light on the surface of the liquid crystal cell 11 cannot be prevented. Therefore, the visibility in a bright place is inferior to the first embodiment.
  • a stretched polymer film such as a polystyrene film can be used.
  • the biaxial films 16 and 30 are each made up of two materials (polymer films). It is preferable to produce by axial stretching.
  • the liquid crystal display D8 of the eighth embodiment is substantially the same as the liquid crystal display D7 of the seventh embodiment except that a front plate 20h is provided instead of the front plate 20g.
  • the front plate 20h is substantially the same as the front plate 20g except for the following points.
  • the front plate 20h further includes the above-described antireflection film 32 in addition to the members included in the front plate 20g.
  • the antireflection film 32 is affixed to the polarizing plate 22c via an adhesive layer or an adhesive layer (not shown).
  • the liquid crystal display D9 of the ninth embodiment is substantially the same as the liquid crystal display D7 of the seventh embodiment, except that a front plate 20i is provided instead of the front plate 20g.
  • the front plate 20 i is substantially the same as the front plate 20 g except that the polarizing plate 22 c is disposed between the protective plate 21 and the low reflection layer 26. That is, in the present embodiment, the polarizing plate 22 c is disposed on the observer side of the protective plate 21.
  • the polarizing plate 22c is provided on the front plate 20i, and the air layer 40 exists between the linearly polarizing element 14 and the linearly polarizing element 24 in the present embodiment as in the first embodiment. Therefore, also in the present embodiment, similarly to the first embodiment, light leakage at the time of black display can be suppressed at an oblique viewing angle, and the occurrence of bright spots can be reduced.
  • the liquid crystal display D10 of the tenth embodiment is substantially the same as the liquid crystal display D9 of the ninth embodiment except that a front plate 20j is provided instead of the front plate 20i.
  • the front plate 20j is substantially the same as the front plate 20i except for the following points.
  • the front plate 20j further includes the above-described antireflection film 32 in addition to the members included in the front plate 20i.
  • the antireflection film 32 is affixed to the surface of the protective plate 21 on the liquid crystal panel 10b side via an adhesive layer or an adhesive layer (not shown).
  • the liquid crystal display D11 of the eleventh embodiment includes the front plate 20k instead of the front plate 20a, and the liquid crystal display D1 of the first embodiment except that the liquid crystal panel 10c is provided instead of the liquid crystal panel 10a. Is substantially the same.
  • the front plate 20k is substantially the same as the front plate 20a except that the front plate 20k includes a polarizing plate 22d instead of the polarizing plate 22a.
  • the polarizing plate 22d is the same as the polarizing plate 22a except that it has a protective film 31 such as a triacetyl cellulose (TAC) film instead of the ⁇ / 4 plate 25.
  • a protective film 31 such as a triacetyl cellulose (TAC) film instead of the ⁇ / 4 plate 25.
  • the liquid crystal panel 10c is substantially the same as the liquid crystal panel 10a except that a polarizing plate 12c is provided instead of the polarizing plate 12a.
  • the polarizing plate 12 c is substantially the same as the polarizing plate 12 a except that it has a biaxial film ( ⁇ AC plate) 17 instead of the ⁇ / 4 plate 15.
  • the in-plane retardation R and the NZ coefficient of the biaxial film 17 are, for example, 60 nm and 4.1, respectively.
  • the in-plane slow axis of the biaxial film 17 is arranged parallel to the absorption axis of the linearly polarizing element 14.
  • the liquid crystal display D11 performs display using the polarizing plates 12c and 22d that function as linear polarizing plates.
  • an air layer 40 exists between the linearly polarizing element 14 and the linearly polarizing element 24. Therefore, also in the present embodiment, similarly to the first embodiment, light leakage at the time of black display can be suppressed at an oblique viewing angle, and the occurrence of bright spots can be reduced. Further, since the present embodiment performs display using the polarizing plates 12c and 22d that function as linear polarizing plates, it is darker than the first embodiment that performs display using the polarizing plates 12a and 22a that function as circularly polarizing plates. Visibility at the place can be improved. Furthermore, as the polarizing plate 12c, a linear polarizing plate with a biaxial film that is already widely used can be used.
  • the present embodiment includes the polarizing plates 12c and 22d that function as linear polarizing plates, reflection of external light on the surface of the liquid crystal cell 11 cannot be prevented. Therefore, the visibility in a bright place is inferior to the first embodiment.
  • a stretched polymer film such as a polystyrene film can be used.
  • the biaxial film 17 is produced by biaxially stretching the material (polymer film). It is preferable.
  • Embodiment 12 As shown in FIG. 20, the liquid crystal display D12 of the twelfth embodiment is substantially the same as the liquid crystal display D11 of the eleventh embodiment except that a front plate 20l is provided instead of the front plate 20k.
  • the front plate 20l is substantially the same as the front plate 20k except for the following points.
  • the front plate 20l further includes the above-described antireflection film 32 in addition to the members included in the front plate 20k.
  • the antireflection film 32 is attached to the polarizing plate 22d via an adhesive layer or an adhesive layer (not shown).
  • the low reflection layer 28 may be formed on the protective film 31 without providing the base film 27.
  • the liquid crystal display D13 of the thirteenth embodiment is substantially the same as the liquid crystal display D11 of the eleventh embodiment except that a front plate 20m is provided instead of the front plate 20k.
  • the front plate 20m is substantially the same as the front plate 20k except that the polarizing plate 22d is disposed between the protective plate 21 and the low reflection layer 26. That is, in the present embodiment, the polarizing plate 22d is disposed on the observer side of the protective plate 21.
  • the polarizing plate 22d is provided on the front plate 20m, and also in the present embodiment, the air layer 40 exists between the linearly polarizing element 14 and the linearly polarizing element 24 as in the first embodiment. Therefore, also in the present embodiment, similarly to the first embodiment, light leakage at the time of black display can be suppressed at an oblique viewing angle, and the occurrence of bright spots can be reduced.
  • the liquid crystal display D14 of the fourteenth embodiment is substantially the same as the liquid crystal display D13 of the thirteenth embodiment except that a front plate 20n is provided instead of the front plate 20m.
  • the front plate 20n is substantially the same as the front plate 20m except for the following points.
  • the front plate 20n further includes the antireflection film 32 described above in addition to the members included in the front plate 20m.
  • the antireflection film 32 is affixed to the surface of the protective plate 21 on the liquid crystal panel 10c side via an adhesive layer or an adhesive layer (not shown).
  • the arrangement positions of the protective film 31 and the biaxial film 17 may be interchanged.
  • the biaxial film 17 is provided on the polarizing plate 12c on the back side, and the protective film 31 is provided on the polarizing plate 22d on the viewer side.
  • the biaxial film 17 is provided on the observer-side polarizing plate 22d, and the protective film 31 is provided on the back-side polarizing plate 12c (hereinafter referred to as form B). Is preferred).
  • the light emitted from the backlight is first converted to linearly polarized light by passing through the linearly polarizing element 14, and then converted to elliptically polarized light by passing through the biaxial film 17.
  • the elliptically polarized light enters the liquid crystal cell 11.
  • the liquid crystal cell 11 preferably includes a TFT array substrate 5 having TFTs, a color filter substrate 6 having color filters, and a liquid crystal layer 7 sandwiched between the substrates 5 and 6.
  • the light emitted from the backlight is first converted to linearly polarized light by passing through the linearly polarizing element 14, and then passes through the protective film 31. Since the retardation of the protective film 31 is small, the polarization state of linearly polarized light does not change much even when passing through the protective film 31, and the polarization state close to linearly polarized light is maintained.
  • This light that is close to linearly polarized light is incident on the liquid crystal cell 11, and part of the light is scattered by the TFT, the liquid crystal layer 7, or the color filter, and is incident on the polarizing plate 22 d on the viewer side in the polarization state. To do. As a result, most of the light scattered in the liquid crystal cell 11 is absorbed by the polarizing plate 22d.
  • the form B can suppress more light leakage at the time of black display compared with the form A, a higher contrast can be obtained.
  • Embodiments 1 to 14 may include a touch panel instead of the protective plate 21.
  • the touch panel is an input device for inputting various types of information, and information can be input while seeing through the screen by touching (pressing) the surface of the touch panel. In this way, the touch panel can interactively and intuitively operate the liquid crystal display simply by touching a predetermined location on the screen with a finger, a pen, or the like.
  • the operation principle of the touch panel is not particularly limited, and includes a resistive film method, a capacitive coupling method, an infrared method, an ultrasonic method, an electromagnetic induction coupling method, etc. Among them, from the viewpoint of cost reduction, the resistive film method and A capacitive coupling method is preferable.
  • each ⁇ / 4 plate may be a birefringent layer (retardation film) having flat dispersibility or reverse wavelength dispersibility. Thereby, coloring of reflected light can be reduced.
  • the upper part of FIG. 25 shows a simulation model M1 related to the liquid crystal display of Comparative Example 7, and the lower part of FIG. 25 shows an equiluminance contour diagram of the model M1.
  • the TAC film 51, the absorption linear polarizing element 52, the ⁇ / 4 plate 53, the vertical alignment type liquid crystal cell 54, the ⁇ / 4 plate 55, the absorption linear polarizing element 56, and the TAC film 57 are laminated in this order.
  • a normal backlight unit (not shown) having a constant brightness regardless of the gradation of the liquid crystal cell 54 is disposed under the linearly polarizing element 51.
  • the in-plane retardation R of each of the ⁇ / 4 plates 53 and 55 is set to 140 nm, and the NZ coefficient of each of the ⁇ / 4 plates 53 and 55 is set to 1.6.
  • the thickness direction retardation Rth of the liquid crystal cell 54 during black display was set to 300 nm.
  • the absorption axes of the linear polarizing elements 52 and 56 were set to 90 ° azimuth and 0 ° azimuth, respectively, and the in-plane slow axes of the ⁇ / 4 plates 53 and 55 were set to 135 ° azimuth and 45 ° azimuth, respectively.
  • the in-plane retardation R of the TAC films 51 and 57 was set to 0 nm, and the thickness direction retardation Rth of the TAC films 51 and 57 was set to 30 nm.
  • the upper part of FIG. 26 shows a simulation model M2 related to the liquid crystal display of Comparative Example 8, and the lower part of FIG. 26 shows an equiluminance contour diagram of the model M2.
  • the model M2 is the same as the model M1 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the ⁇ / 4 plate 55 and the liquid crystal cell.
  • FIG. 27 shows the azimuth angle dependence of the black display luminance of the models M1 and M2 at a polar angle of 60 °.
  • FIG. 28 shows a simulation model M3 related to the liquid crystal display of Comparative Example 9, and the lower part of FIG. 28 shows an equiluminance contour diagram of the model M3.
  • a biaxial film (-AC plate) 59 is inserted between the ⁇ / 4 plate 55 and the linearly polarizing element 56, and the NZ coefficients of the ⁇ / 4 plates 53 and 55 are respectively changed to 1.9. Is the same as the model M1.
  • the in-plane retardation R and NZ coefficient of the biaxial film 59 were set to 115 nm and ⁇ 0.4, respectively.
  • the in-plane slow axis of the biaxial film 59 was disposed in parallel with the absorption axis of the linearly polarizing element 56.
  • the upper part of FIG. 29 shows a simulation model M4 related to the liquid crystal display of Comparative Example 10, and the lower part of FIG. 29 shows an equiluminance contour diagram of the model M4.
  • the model M4 is the same as the model M3 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the ⁇ / 4 plate 55 and the liquid crystal cell.
  • FIG. 30 shows the azimuth angle dependence of the black display luminance of the models M3 and M4 at a polar angle of 60 °.
  • the upper part of FIG. 31 shows a simulation model M5 related to the liquid crystal display of Comparative Example 11, and the lower part of FIG. 31 shows an equiluminance contour diagram of the model M5.
  • the model M5 is the same as the model M1 except that it has biaxial films (-AC plates) 60 and 61 instead of the ⁇ / 4 plates 53 and 55.
  • the in-plane retardation R and NZ coefficient of the biaxial films 60 and 61 were set to 55 nm and 2.77, respectively.
  • the in-plane slow axes of the biaxial films 60 and 61 were arranged in parallel with the absorption axes of the linearly polarizing elements 52 and 56, respectively.
  • the upper part of FIG. 32 shows a simulation model M6 related to the liquid crystal display of Comparative Example 12, and the lower part of FIG. 32 shows an equiluminance contour diagram of the model M6.
  • the model M6 is the same as the model M5 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the biaxial film 61 and the liquid crystal cell.
  • FIG. 33 shows the azimuth angle dependence of the black display luminance of the models M5 and M6 at a polar angle of 60 °.
  • the upper part of FIG. 34 shows a simulation model M7 related to the liquid crystal display of Comparative Example 13, and the lower part of FIG. 34 shows an equiluminance contour diagram of the model M7.
  • the model M7 is the same as the model M1 except that it has a biaxial film (-AC plate) 62 instead of the ⁇ / 4 plate 53 and a TAC film 63 instead of the ⁇ / 4 plate 55.
  • the in-plane retardation R and NZ coefficient of the biaxial film 62 were set to 60 nm and 4.1, respectively.
  • the in-plane slow axis of the biaxial film 62 was arranged in parallel with the absorption axis of the linearly polarizing element 52.
  • the in-plane retardation R of the TAC film 63 was set to 0 nm, and the thickness direction retardation Rth of the TAC film 63 was set to 30 nm.
  • the upper part of FIG. 35 shows a simulation model M8 related to the liquid crystal display of Comparative Example 14, and the lower part of FIG. 35 shows an equiluminance contour diagram of the model M8.
  • the model M8 is the same as the model M7 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the TAC film 63 and the liquid crystal cell.
  • FIG. 36 shows the azimuth angle dependence of the black display luminance at a polar angle of 60 ° for the models M7 and M8.
  • a liquid crystal display having an air gap structure and having a normal backlight does not have an air gap structure, and light leakage during black display is less than that of a liquid crystal display having a normal backlight. It was confirmed that it occurred more.
  • the upper part of FIG. 37 shows a simulation model M9, and the lower part of FIG. 37 shows an equiluminance contour diagram of the model M9.
  • the model M9 is the same as the model M1 except that the ⁇ / 4 plates 53 and 55 and the ⁇ / 2 plate 64 are used instead of the liquid crystal cell 54.
  • the in-plane retardation R and NZ coefficient of the ⁇ / 2 plate 64 were set to 275 nm and 0.5, respectively.
  • the in-plane slow axis of the ⁇ / 2 plate 64 was set to 135 ° azimuth.
  • the dimming BL1 cannot control the brightness in units of pixels and controls the brightness in the entire area of the light emitting unit or in units of divided areas, the output of the dimming BL1 is used when displaying a dark image. Even if dropped, it may not turn off completely. In that case, light leakage derived from the polarizing plate occurs.
  • a base film such as a TAC film functions as a retardation film. Therefore, there is a possibility that the optimum retardation of the retardation film other than the base film changes. Therefore, after that, when providing a TAC film for an antireflection film, it was simulated how much the viewing angle deteriorated with and without an air layer. Further, in the case where the viewing angle compensation film of Embodiment 1 or the like was not included, the optimum retardation of the ⁇ / 4 plate was verified.
  • the upper part of FIG. 38 shows a simulation model M10 related to the liquid crystal display of Comparative Example 15, and the lower part of FIG. 38 shows an equiluminance contour diagram of the model M10.
  • the model M10 is the same as the model M1 except that the TAC film 65 is inserted between the ⁇ / 4 plate 55 and the liquid crystal cell 54.
  • the in-plane retardation R of the TAC film 65 was set to 0 nm, and the thickness direction retardation Rth of the TAC film 65 was set to 30 nm.
  • the upper part of FIG. 39 shows a simulation model M11 related to the liquid crystal display of Comparative Example 16, and the lower part of FIG. 39 shows an equiluminance contour diagram of the model M11.
  • the model M11 is the same as the model M10 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the TAC film 65 and the liquid crystal cell 54.
  • FIG. 40 shows the azimuth angle dependence of the black display luminance at the polar angle of 60 ° of the models M10 and M11.
  • the upper part of FIG. 41 shows a simulation model M12 related to the liquid crystal display of Comparative Example 17, and the lower part of FIG. 41 shows an equiluminance contour diagram of the model M12.
  • the model M12 is the same as the model M3 except that the TAC film 65 is inserted between the ⁇ / 4 plate 55 and the liquid crystal cell 54.
  • the upper part of FIG. 42 shows a simulation model M13 related to the liquid crystal display of Comparative Example 18, and the lower part of FIG. 42 shows an equiluminance contour diagram of the model M13.
  • the model M13 is the same as the model M12 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the TAC film 65 and the liquid crystal cell.
  • FIG. 43 shows the azimuth angle dependence of the black display luminance of the models M12 and M13 at a polar angle of 60 °.
  • the upper part of FIG. 44 shows a simulation model M14 related to the liquid crystal display of Comparative Example 19, and the lower part of FIG. 44 shows an equiluminance contour diagram of the model M14.
  • the model M14 is the same as the model M5 except that the TAC film 65 is inserted between the biaxial film 61 and the liquid crystal cell 54.
  • the upper part of FIG. 45 shows a simulation model M15 related to the liquid crystal display of Comparative Example 20, and the lower part of FIG. 45 shows an equiluminance contour diagram of the model M15.
  • the model M15 is the same as the model M14 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the TAC film 65 and the liquid crystal cell 54.
  • FIG. 46 shows the azimuth angle dependency of the black display luminance at the polar angle of 60 ° of the models M14 and M15.
  • the upper part of FIG. 47 shows a simulation model M16 related to the liquid crystal display of Comparative Example 21, and the lower part of FIG. 47 shows an equiluminance contour diagram of the model M16.
  • the model M16 is the same as the model M7 except that the TAC film 65 is inserted between the TAC film 63 and the liquid crystal cell 54.
  • the upper part of FIG. 48 shows a simulation model M17 related to the liquid crystal display of Comparative Example 22, and the lower part of FIG. 48 shows an equiluminance contour diagram of the model M17.
  • the model M17 is the same as the model M16 except that an air layer 58 having a thickness of 100 ⁇ m is provided between the TAC film 65 and the liquid crystal cell.
  • FIG. 49 shows the azimuth angle dependence of the black display luminance at the polar angle of 60 ° for the models M16 and M17.
  • the simulation was performed by changing the NZ coefficients of the ⁇ / 4 plates 53 and 55 in the model M11. More specifically, the NZ coefficients of the ⁇ / 4 plates 53 and 55 are set to 1.6 to 1.0, 1.3, 1.4, 1.5, 1.7, 1.9, 2.5, 3. Changed to 0 or 4.0. Note that the NZ coefficients of the ⁇ / 4 plates 53 and 55 were set to the same value. 50 and 51 show the results (azimuth angle dependence of black display luminance at a polar angle of 60 °). As shown in FIGS. 50 and 51, it was found that the optimum value of the NZ coefficient of the ⁇ / 4 plates 53 and 55 was approximately 1.5.
  • ZEONOR is a retardation film manufactured by ZEON Corporation, and the NZ coefficient of ZEONOR used as a ⁇ / 4 plate is 1.55 to 1.6. Therefore, ZEONOR is suitable as the ⁇ / 4 plates 53 and 55. I found out that
  • a TAC film is provided as a base material for the antireflection film 32, and the light control BL1 cannot control the brightness in units of pixels, and the brightness is controlled in the entire area of the light emitting unit or in units of divided areas.
  • the NZ coefficients of the ⁇ / 4 plates 53 and 55 are preferably 1 to 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention porte sur un dispositif d'affichage à cristaux liquides, qui présente une structure dans laquelle une cellule de cristaux liquides et un élément polarisant linéaire côté observateur sont disposés, une couche d'air située entre ceux-ci, et qui présente une qualité visuelle améliorée. Le dispositif d'affichage à cristaux liquides comprend une cellule de cristaux liquides, un élément polarisant linéaire agencé sur le côté observateur de ladite cellule de cristaux liquides, une couche d'air située entre ceux-ci, et un rétroéclairage ayant une brillance variable selon la gradation de ladite cellule de cristaux liquides. Aucun autre élément polarisant n'est disposé entre ladite cellule de cristaux liquides et ledit élément polarisant linéaire.
PCT/JP2012/065514 2011-07-15 2012-06-18 Dispositif d'affichage à cristaux liquides WO2013011781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011156888 2011-07-15
JP2011-156888 2011-07-15

Publications (1)

Publication Number Publication Date
WO2013011781A1 true WO2013011781A1 (fr) 2013-01-24

Family

ID=47557967

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/065514 WO2013011781A1 (fr) 2011-07-15 2012-06-18 Dispositif d'affichage à cristaux liquides

Country Status (1)

Country Link
WO (1) WO2013011781A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9581857B2 (en) 2013-09-12 2017-02-28 Japan Display Inc. Display device and manufacturing method of the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010191448A (ja) * 2010-03-25 2010-09-02 Rohm Co Ltd 表示装置
WO2010109723A1 (fr) * 2009-03-25 2010-09-30 シャープ株式会社 Dispositif d'affichage
JP2011128285A (ja) * 2009-12-16 2011-06-30 Sharp Corp 液晶表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109723A1 (fr) * 2009-03-25 2010-09-30 シャープ株式会社 Dispositif d'affichage
JP2011128285A (ja) * 2009-12-16 2011-06-30 Sharp Corp 液晶表示装置
JP2010191448A (ja) * 2010-03-25 2010-09-02 Rohm Co Ltd 表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9581857B2 (en) 2013-09-12 2017-02-28 Japan Display Inc. Display device and manufacturing method of the same
US10101605B2 (en) 2013-09-12 2018-10-16 Japan Display Inc. Display device and manufacturing method of the same

Similar Documents

Publication Publication Date Title
US10747057B2 (en) Display device
WO2016152311A1 (fr) Afficheur à miroir
JP6068052B2 (ja) 液晶表示素子
KR20110064669A (ko) 투명 액정표시소자
JP6887525B2 (ja) 表示装置
KR20140089678A (ko) 광시야각 액정표시장치
JP5508427B2 (ja) 液晶表示装置
JP2008090173A (ja) 表示装置
WO2012005050A1 (fr) Dispositif d'affichage à cristaux liquides
JP2011002596A (ja) 液晶表示装置
WO2013111867A1 (fr) Dispositif d'affichage à cristaux liquides
KR20090117641A (ko) 음의 굴절률 특성을 갖는 이축성 위상차 필름과 양의 굴절률 특성을 갖는 이축성 위상차 필름이 구비된 면상 스위칭 액정 표시장치
JP2020085931A (ja) 液晶表示装置
US20150293406A1 (en) Single-Layered Biaxial Compensation Structure For Liquid Crystal Panels And The Liquid Crystal Displays
KR20120111372A (ko) 액정표시장치
US20160246096A1 (en) Liquid crystal panel compensation structure and liquid crystal display apparatus
WO2013011781A1 (fr) Dispositif d'affichage à cristaux liquides
KR101948827B1 (ko) 투명 액정표시장치
US20160124264A1 (en) Compensation structure for liquid crystal panels and the liquid crystal displays
US20150286083A1 (en) Dual-layered biaxial compensation structure for liquid crystal panels and the liquid crystal displays
JP2010211232A (ja) 光学素子及びそれを用いた表示装置
KR20090056210A (ko) 위상차필름을 포함하는 면상 스위칭 액정 표시 장치
JP5475963B2 (ja) 液晶表示装置
KR20140098310A (ko) 액정표시장치
JP5650911B2 (ja) 液晶表示素子

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12814563

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12814563

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP