JP2002090725A - Liquid crystal panel and liquid crystal display device - Google Patents

Liquid crystal panel and liquid crystal display device

Info

Publication number
JP2002090725A
JP2002090725A JP2000331133A JP2000331133A JP2002090725A JP 2002090725 A JP2002090725 A JP 2002090725A JP 2000331133 A JP2000331133 A JP 2000331133A JP 2000331133 A JP2000331133 A JP 2000331133A JP 2002090725 A JP2002090725 A JP 2002090725A
Authority
JP
Japan
Prior art keywords
liquid crystal
light
layer
crystal panel
display device
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2000331133A
Other languages
Japanese (ja)
Inventor
Tsuyoshi Kamimura
Hiroshi Kubota
強 上村
浩史 久保田
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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
Priority to JP30990399 priority Critical
Priority to JP2000017721 priority
Priority to JP2000-208077 priority
Priority to JP2000208077 priority
Priority to JP2000-17721 priority
Priority to JP11-309903 priority
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2000331133A priority patent/JP2002090725A/en
Publication of JP2002090725A publication Critical patent/JP2002090725A/en
Application status is Pending legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal panel and a liquid crystal display device which is capable of realizing peak luminance. SOLUTION: Light 107 from a backlight incident on a black display part 112 is selectively reflected by using difference in alignment states of a liquid crystal layer 106 in driving the panel, is guided and recycled to a white display part 113.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a high luminance, and more particularly to a liquid crystal panel and a liquid crystal display device capable of realizing a peak luminance.

[0002]

2. Description of the Related Art As a method of increasing the brightness of a liquid crystal display device,
A method of laminating a film between a liquid crystal panel and a backlight is known. For example, a light-condensing film (for example, BE
F, manufactured by 3M) or a polarized light selective reflection film (for example, D-
BEF (manufactured by 3M) is used between the backlight and the liquid crystal panel. On the other hand, in the CRT, since the electron beam is irradiated only to the white display portion on the screen, the smaller the white display portion, the higher the irradiation intensity of the electron beam per unit time, and there is a peak luminance phenomenon in which the white luminance is improved. Was.

[0003]

However, although the above-mentioned method using a film is effective in improving white luminance,
In the black display, the light of the backlight is all absorbed by the polarizing plate of the liquid crystal panel. For this reason, the value of the white luminance is constant irrespective of the display on the screen, and as a result, it has been difficult for the liquid crystal display device to produce the above-mentioned peak luminance.

[0004] In view of the above, it is an object of the present invention to provide a liquid crystal panel and a liquid crystal display device capable of realizing peak luminance.

[0005]

In order to achieve the above object, the present invention relates to a liquid crystal panel having a polarizing layer on both sides of a liquid crystal layer, wherein the polarizing layer located on the viewer side reflects and transmits light depending on the polarization state. And a second polarizing layer having a higher degree of polarization than the first polarizing layer. If the second polarizing layer having a higher degree of polarization than the first polarizing layer is provided as in the above configuration, extra light can be further cut off, so that the contrast is improved.

The liquid crystal panel according to claim 1, wherein the polarizing layer positioned on the side opposite to the observer is a first polarizing layer that selectively separates reflection and transmission depending on a polarization state, and the first polarizing layer. And a second polarizing layer having a higher degree of polarization. With the above configuration, light can be smoothly recycled, and the effect of realizing peak luminance can be further exhibited.

3. A liquid crystal panel according to claim 1, wherein said second polarizing layer is an absorption type polarizing layer. With the above configuration, the effect described in claim 1 or 2 can be easily achieved.

3. The liquid crystal panel according to claim 2, wherein the polarizing layer located on the observer side reflects light having the same polarization state as the transmitted light of the polarizing layer located on the opposite observer side, and transmits the light. It is characterized by transmitting light having a different polarization state from light. With such a configuration, light of the black display portion is not emitted to the surface, while light of the white display portion is emitted to the surface.

3. The liquid crystal panel according to claim 1, wherein the second polarizing layer is disposed on the first polarizing layer. 3. The liquid crystal panel according to claim 1, wherein the first polarizing layer and the second polarizing layer are provided on an inner side of a substrate located on a viewer side. 4. With such a configuration, the advantage that the cell can be thinned is exhibited.

7. The liquid crystal panel according to claim 6, further comprising a color filter on a substrate located on the observer side, wherein the first polarizing layer of the substrate located on the observer side is arranged on the liquid crystal layer side of the color filter. It is characterized by having been done. With such a configuration, light is not absorbed by the color filter layer in the black display portion.

7. The liquid crystal panel according to claim 6, further comprising a color filter on a substrate located on the side opposite to the observer, wherein the first polarizing layer of the substrate located on the side opposite to the observer is located on the substrate side of the color filter. It is characterized by being arranged.

3. The liquid crystal panel according to claim 1, wherein said first polarizing layer is a Nicol prism, a scattering element (preferably having anisotropy), and a multilayer film having a different refractive index. Or a holographic element. These can exhibit the effect of having selectivity to the polarization of light.

3. The liquid crystal panel according to claim 1, wherein said first polarizing layer reflects either left or right circularly polarized light, and preferably, said first polarizing layer has a helical structure. More preferably, the helical structure is made of a cholesteric liquid crystal or a polymer. If the refractive index distribution has a spiral structure, light transmission and reflection can be performed smoothly using the selected wavelength characteristic.

A liquid crystal panel according to claim 15, wherein a retardation layer for changing circularly polarized light to linearly polarized light is provided. 3. The liquid crystal panel according to claim 1, wherein the liquid crystal layer is configured such that a phase change of light propagating perpendicularly to the liquid crystal layer becomes substantially zero during black display. If there is no phase change in the liquid crystal layer in this manner, light in the black display portion is reliably reflected.

20. The liquid crystal panel according to claim 19, wherein the liquid crystal layer is in a vertical alignment mode in which the liquid crystal has a vertical alignment when no voltage is applied, or the liquid crystal layer has a homogeneous alignment when no voltage is applied. And a lateral electric field mode driven by a lateral electric field parallel to the substrate. With the above configuration, light transmitted through the liquid crystal layer during black display is not subjected to polarization conversion.

3. The liquid crystal panel according to claim 1, wherein the liquid crystal layer is configured such that a phase change of light propagating perpendicularly to the liquid crystal layer is minimized during black display. 23. The liquid crystal panel according to claim 22, wherein the liquid crystal layer is in a twisted nematic mode, a hybrid alignment mode, or an OCB mode.

In a liquid crystal display device having a liquid crystal panel capable of displaying a dark display and a bright display, the light incident on the dark display portion is guided to the bright display portion by a light guide mechanism, whereby the dark display portion is provided. Wherein at least a part of the light incident on the display is used for displaying the bright display section.

In a liquid crystal display device having a liquid crystal panel and capable of displaying a dark display and a bright display, a part of the light incident on the dark display portion is guided to the bright display portion by a light guide mechanism, thereby providing a bright display portion. The brightness of the bright display section increases as the relative display area of the dark display section to the display section increases.

In a liquid crystal display device having a liquid crystal panel and capable of displaying a dark display and a bright display, a part of the light incident on the dark display portion is guided to the bright display portion by a light guide mechanism, thereby providing a dark display. The brightness of the bright display section is higher as the gray level of the display section is closer to black.

A backlight unit, a liquid crystal panel having a reflection unit and a transmission unit in a pixel, and backlight light reflected on the back surface of the reflection unit and external light transmitted from the transmission unit to the backlight side. , Using the light guide mechanism to guide to the bright display section,
The light is emitted from the bright display section.

30. A liquid crystal panel according to claim 29, wherein said pixel has a concavo-convex structure, and said transmission portion is formed to include a flat portion of said concavo-convex structure. With such a configuration, the opening area can be improved while maintaining the reflection characteristics.

30. A liquid crystal panel according to claim 29, wherein said backlight unit emits RGB light in a time sharing manner. With such a configuration, the luminance during transmission can be improved.

The liquid crystal panel according to claim 26, 27, 28 or 29, wherein the light guide mechanism is provided.
And a light guide disposed adjacent to the liquid crystal panel on the side opposite to the observer. 33. The liquid crystal panel according to claim 32, further comprising: a backlight unit including a light guide having a diffusion layer on a viewer side; and the light guide on a viewer side of the diffusion layer. I do.

33. The liquid crystal panel according to claim 32, wherein the light guide transmits the backlight and transmits at least a part of the reflected light of the liquid crystal panel inside. 35. The liquid crystal panel according to claim 34, wherein the light guide has a structure in which layers having different refractive indexes are obliquely stacked.

The liquid crystal panel according to claim 34, wherein the light guide has a structure in which an asymmetrical groove is formed on a surface on a backlight side. 30. The liquid crystal display device according to claim 26, further comprising a driving unit, wherein the driving unit performs driving for inserting black display for a certain period within a frame period. With the above configuration, the tailing phenomenon of the image is reduced and the response speed is improved while suppressing the decrease in the luminance of the white display section.

30. The liquid crystal display device according to claim 26, further comprising a driving unit, wherein a multiple reflection preventing means is provided. With such a configuration, since multiple reflection due to the remaining birefringence in the liquid crystal panel can be prevented, light leakage in a black portion can be prevented, and the contrast is improved.

The liquid crystal display device according to claim 29,
The backlight is a sidelight type. With such a configuration, the reflected polarized light is easily reflected, so that the light is reused smoothly.

In a liquid crystal display device having a liquid crystal panel, light having a plurality of phases is converted by converting light incident on the liquid crystal layer into light transmitted through the liquid crystal layer with different optical path lengths by a light guide mechanism. The light is emitted in the same direction. 41. The liquid crystal panel according to claim 40, wherein the light guide mechanism comprises a liquid crystal layer and a polarizing layer for selectively separating reflection and transmission depending on a polarization state.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Outline of the Present Invention) The liquid crystal panel of the present invention has a function of reflecting light incident on a dark display portion and transmitting light incident on a bright display portion. For this reason, the liquid crystal panel of the present invention has a liquid crystal layer and a polarization selective reflection layer 303 as a first polarizing layer on the viewing side (FIG. 1A) or on both sides of the liquid crystal layer (FIG. 1B). )). Or
When the color filter layer 305 is provided on the viewing side of the liquid crystal layer, a polarization selective reflection layer 303 is provided between the liquid crystal layer 304 and the color filter layer 305 (FIG. 1C).
).

At this time, an absorption type polarizing layer 301 as a second polarizing layer is provided on the viewing side of the polarization selective reflection layer 303. As described above, when the absorption-type polarizing layer 301 is used, there is an advantage that, among the light transmitted through the polarization-selective reflection layer 303, light having extra polarized light not used for display is absorbed, and an effect of improving the contrast is obtained. . Incidentally, in FIG.
Denotes a glass substrate, and 302 denotes a counter substrate.

Next, FIG. 2 shows the principle that the above-mentioned structure can selectively reflect or transmit the light incident on the liquid crystal layer.
In FIG. 2, reference numeral 400 denotes a glass substrate, and 403 denotes a counter substrate.

The polarization selective reflection layer A402 transmits linearly polarized P-waves and reflects S-waves among the backlight lights 407 and 412. The polarization selective reflection layer B405 also has a property of reflecting P-waves and transmitting S-waves of incident light.
As the liquid crystal layer 406, a layer in which the phase of the transmitted light does not change in the black display portion 415 and undergoes PS conversion 413 in the white display portion 416 is used. For example, as the liquid crystal layer 406, a liquid crystal layer in which the phase change of light vertically propagating through the liquid crystal layer becomes substantially zero during black display can be used. Further, the absorption type polarizing layer A401 is configured to transmit the P wave, and the absorption type polarizing layer B405 is configured to transmit the S wave.

Of the backlight 407 incident on the black display section 415, the S wave 410 is reflected by the polarization selective reflection layer A401, and the P wave 408 is transmitted. The P-wave 408 further passes through the absorption-type polarizing layer A 401 and enters the liquid crystal layer 406. At this time, even if a part of the S wave is transmitted through the polarization selective reflection layer A402, the transmitted S wave is transmitted through the absorption type polarization layer A40.
Therefore, only the P-wave is incident on the liquid crystal layer 406 because it is absorbed by the liquid crystal layer 406. The incident P-wave 408 enters the viewing-side polarization selective reflection layer B404 without being modulated in phase by the liquid crystal layer 406, and is reflected as a P-wave 409. Therefore, light is not emitted from the panel, and a black display is obtained. Reflected P wave 409
Transmits through the absorption-type polarizing layer A402 and the polarization selective reflection layer A401 as a P-wave, and the P-wave 411
Is emitted. Also, the absorption type polarizing layer B40 is provided on the viewing side.
5 is arranged, even if a part of the P wave is transmitted through the polarization selective reflection layer B405, the transmitted P wave is absorbed by the absorption type polarization layer B40.
5, a black display is obtained.

At this time, as the polarization selective reflection layer, a layer having selectivity to the polarization of light can be used. For example, a Nicol prism, a dielectric multilayer film, or a holographic element can be used. These are P wave and S
And waves can be selectively transmitted or reflected. Also,
The polarization selectivity may have azimuthal anisotropy. For example, the degree of selectivity may be different for light that is perpendicularly incident on the polarization selective reflection layer and light that is incident obliquely. For example, when the viewing range is limited to the front in a portable terminal or the like, the polarization selectivity may be increased within a range of a polar angle of 20 ° or less from the normal direction of the polarization selective reflection layer. Further, the anisotropy of the polarization selective reflection layer may be designed according to the angular distribution of light incident on the liquid crystal panel from the backlight.

Further, a scattering element may be used. For example,
Since the scattering element made of the composite of the liquid crystal and the polymer has azimuthal anisotropy in the refractive index matching, it can selectively scatter and transmit the P wave and the S wave.

The polarization selection layer may be one that reflects either left or right circularly polarized light. For example, a layer having a spiral refractive index distribution in the layer may be used. Specifically, a helical structure may be formed using a cholesteric liquid crystal or a polymer.

On the other hand, the backlight 412 incident on the white display portion 416 is also converted into a P-wave 418 by the liquid crystal layer 406.
, And is subjected to PS conversion 413 in the liquid crystal layer 406 to generate S
A wave 417 is transmitted as the S wave 414 through the polarization selective reflection layer B404 and the absorption type polarization layer B405. Therefore, a white display is obtained.

At this time, the liquid crystal layer 406 has both the function of controlling the polarization state of the light incident on the polarization selective reflection layer B404 to realize the selectivity of reflection and transmission, and the function of displaying.

When an absorption type color filter layer is used on the viewing side, a black selective display layer 41 is provided by providing a polarization selective reflection layer B404 between the liquid crystal layer 406 and the color filter layer.
In No. 5, light is not absorbed by the color filter layer, and almost the entire amount of light is reflected to the backlight side in the polarization selective reflection layer B404.

As a panel driving method, a driving method in which black display is inserted for a certain period within a frame period may be used. In a hold-type display element such as a liquid crystal display, when a black display is inserted within a frame period, there is an effect that an image trailing phenomenon is reduced and a response speed is improved.
However, conventionally, there has been a problem that the luminance is substantially reduced by black insertion. On the other hand, in the configuration of the present invention, the light incident on the pixel at the time of black display of the pixel is propagated to the white display portion. can get.

According to the first liquid crystal display device of the present invention, the light incident on the liquid crystal layer of the dark display section is guided to the liquid crystal layer of the bright display section by a light guide mechanism, thereby recycling the light incident on the dark display section. Then, it is used to display a bright display section to realize peak luminance.

The display principle for realizing the peak luminance will be described first with reference to FIG. FIG. 3A illustrates the principle that when black-and-white display is present on the screen, the backlight light that has entered the black display portion is light-recycled by the light guide 700 and the like and enters the white display portion.

The polarized P wave is transmitted through the light guide 700,
A liquid crystal panel having a polarization selective reflection layer A700 that reflects S waves, a liquid crystal panel having upper and lower substrates and a liquid crystal layer 716 is laminated, and a polarization selective reflector that transmits polarized S waves and reflects P waves is provided on the upper surface of the upper substrate 702. The reflection layer B703 is laminated.

The liquid crystal layer 713 has an orientation in which the polarization state of the transmitted light does not change at the time of black display and the PS conversion 712 is performed at the time of white display.

At this time, the P wave 705 transmitted through the polarization selective reflection layer A700 retains the P wave even when transmitted through the liquid crystal layer of the black display portion 707. Therefore, the P wave 705 is reflected by the polarization selective reflection layer B 704 on the upper surface, becomes reflected light 710, transmits through the polarization selective reflection layer A 701 again, and then propagates through the light guide 700 as propagation light 711. Light guide 700
Out of the light emitted from the light guide member 707 is again recycled to the light guide 700 for the above-described reason.

On the other hand, the light emitted to the white display portion 708 is subjected to PS conversion 712 in the liquid crystal layer 716 and enters the polarization selective reflection layer B 704 as an S wave 706. At this time, since the S wave transmits through the polarization selective reflection layer B704, the outgoing light A71
It becomes 4. By using the above configuration, light that has entered the black display portion can be transmitted to the light guide 700 and emitted from the white display portion without exiting to the observer side. For this reason, as the display area of the white display section is smaller, the display luminance is higher, and peak luminance is generated.

FIG. 3B shows a halftone display section 70 on the screen.
9 shows the principle of light recycling of incident light when 9 is present. In the case of a halftone display, light has elliptically polarized light 717 at the time when the light passes through the liquid crystal layer 716. At this time, the component of the elliptically polarized S-wave 706 is emitted as emission light B715, and halftone display is performed. Also, the remaining P of the elliptically polarized light 717
The wave component is reflected as reflected light 710 toward the light guide 700. The reflected light 710 propagates through the light guide (propagating light 711), is subjected to PS conversion 712 in the white display portion 708, and is emitted as emission light A714.

According to the above principle, light can be recycled even at the time of halftone display, and peak luminance is exhibited.

When the light transmitted through the black display portion is polarization-converted, the light is emitted from the black display portion and the contrast is reduced. This is because, especially when the recycled light is reflected multiple times on the liquid crystal layer, a hue change or the like occurs, and the visibility is reduced. Therefore, the liquid crystal layer is desirably one in which light transmitted through the liquid crystal layer during black display is not polarization-converted, specifically, a display mode in which the liquid crystal has homeotropic alignment when no voltage is applied,
A horizontal electric field mode having a homogeneous orientation and driven by a horizontal electric field parallel to the substrate is used. In the case of the 90 ° twist nematic mode, it is desirable to use the normally white mode so that the polarization conversion becomes almost zero during black display. Further, as the liquid crystal layer, hybrid alignment or OCB mode can be used. In particular, OCB
In the mode, since the response speed is as fast as several ms, the driving for performing the black insertion described above is effective.

By using the above configuration, display can be performed using the polarization state of the liquid crystal layer, and light can be recycled by selecting the polarization of the polarization selective reflection layer B on the upper surface side.

As the liquid crystal panel, transmissive and transflective panels can be used. The peak luminance of the white display section is determined by the amount of light recycled from the black display and the halftone display section. Therefore, as the number of black display portions on the screen increases, the peak luminance of the white display portion increases. Also, as the luminance of the halftone display unit is closer to the black level, the amount of light emitted in the viewing direction at the halftone display unit decreases, and as a result, the amount of light recycled to the white display unit increases. Therefore, the peak luminance increases as the gradation level of the halftone display section approaches the black level and the gradation level of the white display section approaches the white level.

In FIG. 3, the polarization selective reflection layer B 704 was externally attached to the upper substrate 703. On the other hand, when a color filter is provided inside the upper substrate 703, light absorbed by the color filter is not recycled. For this reason, the polarization selective reflection layer B704 needs to be further provided inside the color filter layer.

The second liquid crystal display device of the present invention has a plurality of phases by converting light incident on the liquid crystal layer into light transmitted through the liquid crystal layer with different optical path lengths by a light guide mechanism. Light is emitted in the same direction. At this time, the light guide mechanism is characterized by comprising a liquid crystal layer and a polarization selective reflection layer. With this configuration, the polarization state of the light transmitted through the liquid crystal layer is averaged, and the occurrence of grayscale inversion is suppressed. FIG. 4 is a principle diagram. At the time of halftone display, there are outgoing light A1209 transmitted through the liquid crystal layer at one time, and outgoing light B1210 emitted after being reflected by the upper and lower polarization selective reflection layers. This is because at the time of halftone display, a mixture of S waves and P waves in the liquid crystal layer generates transmitted light and reflected light at a fixed rate in the polarization selective reflection layer. At this time, the optical path length of the outgoing light B1210 in the liquid crystal layer 1208 is twice as long as the outgoing light A1209. Therefore, the outgoing light A
1209 and the outgoing light B1210 are averaged, and in particular, an effect of reducing grayscale inversion is obtained. FIG.
1200, a glass substrate; 1201, a polarization selective reflection layer A; 1202, an absorption type polarization layer A;
04 is a transparent electrode, 1205 is a counter substrate, 1206 is a polarization selective reflection layer B, 1207 is an absorption type polarization layer B, 1208
Is a liquid crystal layer. Next, a specific embodiment will be described below.

Embodiment 1 [Structure and Operation Principle of Liquid Crystal Display] FIG. 1A is a sectional view of a liquid crystal panel according to Embodiment 1 of the present invention. The polarization selective reflection layer 303 is provided on the counter substrate 302. At this time, according to the principle shown in FIG.
06, the polarization selective reflection layer 3 during black display is displayed.
A liquid crystal panel that can reflect the light reflected at 03 on the backlight side and transmit light during white display can be obtained.

(Embodiment 2) [Structure and principle of operation of liquid crystal display device] FIG. 1B is a sectional view of a liquid crystal panel according to Embodiment 2 of the present invention. The polarization selective reflection layer 303 is provided on both sides of the liquid crystal layer 304. At this time, according to the principle shown in FIG.
Of the polarization selective reflection layer B40 during black display depending on the display state of
4 can be reflected to the backlight side and can be transmitted at the time of white display.
7, the S-wave 410 is converted to the polarized light selective reflection layer A40.
1 makes it possible to reflect light. For this reason, a liquid crystal panel can be obtained in which almost all of the backlight light can be reflected light or transmitted light without being absorbed by a series of optical paths.

[Other Matters] (1) In this example, the polarization selective reflection layer A402 transmits the P wave and reflects the S wave, but this reflects the S wave and transmits the P wave. But it is good. At that time, the polarization selective reflection layer B404 also reflects the P wave and transmits the S wave.

(2) The polarization selective reflection layer may have selectivity for left and right circularly polarized light. For example, polarization selective reflection layer A
It is also possible to use one that reflects right circular polarized light 401 and transmits left circular polarized light, and that the polarization selective reflection layer B404 reflects left circular polarized light and transmits right circular polarized light. In this case, the same effect can be obtained even if the selectivity of the right and left is reversed by the respective polarization selective reflection layers.

Embodiment 3 [Structure and Operation Principle of Liquid Crystal Display] FIG. 1C is a sectional view of a liquid crystal panel according to Embodiment 3 of the present invention. Having a color filter layer 305 on the opposite substrate 302;
A polarization selective reflection layer 303 is provided between the liquid crystal layer 304 and the liquid crystal layer 304.
As the color filter layer, a pigment dispersion type or a dye type can be used. By providing the polarization selective reflection layer 303 between the color filter layer 305 and the liquid crystal layer 304,
During black display, the backlight light is reflected toward the backlight without being absorbed by the color filter layer 305.

(Embodiment 4) [Structure and Operation Principle of Liquid Crystal Display Device] In the liquid crystal panel of Embodiment 1, the change in the polarization state of transmitted light in the liquid crystal layer during black display is almost zero, and white display is performed. Sometimes the polarization is P
A material having an S-converted orientation is used. In particular,
As the liquid crystal layer, a liquid crystal having a negative dielectric anisotropy and having a vertical alignment when no voltage is applied can be used. When the liquid crystal layer has vertical alignment, light traveling in the liquid crystal layer in the direction between the substrates is not subjected to phase modulation. Therefore, for example, light that has entered the liquid crystal layer as a P-wave can enter the polarization selective reflection layer of the counter substrate as it is as the P-wave, and selectively reflects and transmits light according to the principle shown in FIG. . At this time, depending on the display state of the liquid crystal layer, it is possible to obtain a liquid crystal panel that reflects light reflected by the polarization selective reflection layer during black display to the backlight side and transmits light during white display.

[Other Matters] (1) In addition to the above, a horizontal electric field mode alignment in which the liquid crystal has a homogeneous alignment when no voltage is applied may be used for the liquid crystal layer. In the lateral electric field mode, the same effect can be obtained because light traveling through the liquid crystal layer in the direction between the substrates is not subjected to phase modulation.

(2) The polarization selective reflection layer includes the substrate on the viewing side, and can be disposed on one side or both sides of the liquid crystal layer.
A color filter layer can be provided according to the same principle as in the third embodiment.

Fifth Embodiment [Structure and Operation Principle of Liquid Crystal Display] In the liquid crystal panel of the first embodiment, the change in the polarization state of transmitted light is minimized in the liquid crystal layer during black display, and the change in the polarization state during white display is minimized. One having an orientation in which polarized light is converted into PS is used. Specifically, a twisted nematic mode, a hybrid mode, an OCB mode having bend alignment, or the like can be used for the liquid crystal layer. In these, when the liquid crystal rises from the substrate by applying a voltage, a black display is obtained. At this time, the phase change of light passing through the liquid crystal layer in the direction between the substrates is not zero but is minimal. If the phase change is minimized, for example, most of the light incident on the liquid crystal layer as a P-wave will enter the polarization selective reflection layer on the counter substrate side while retaining the P-wave. A liquid crystal panel is obtained in which transmitted light or reflected light is obtained without absorbing most of the light.

(Embodiment 6) [Structure of liquid crystal display] FIG. 5 shows Embodiment 6 of the present invention.
1 is a cross-sectional view of a transmission type liquid crystal display device according to FIG. The backlight is omitted for simplicity. Liquid crystal layer 10 between upper and lower substrates
A diffusion layer 100, a light guide 101, and a polarization conversion selection layer A102 are stacked below the liquid crystal panel sandwiching the liquid crystal panel 6, and a polarization selection reflection layer B105 is stacked above. FIG.
In the figure, 103 is a lower substrate, and 104 is an upper substrate.

[Operating Principle of Liquid Crystal Display] Of the incident light 107 from the backlight, a P-wave component 108 passes through the polarization selective reflection layer A102, and an S-wave 109 component is reflected. The reflected light is diffused by the diffusion layer 100 to become natural light, and propagates in the light guide 101. The black display unit 112
Is reflected by the polarization conversion selection layer B105 because it is not subjected to polarization conversion by the liquid crystal layer, and propagates in the light guide 101 as well.

In the black display section 112, of the light propagating in the light guide, the P-wave component of the natural light due to the diffusion 111 sequentially enters the liquid crystal layer 106 again, and then the polarization selective reflection layer B105.
And propagates through the light guide 101 again.

In the white display section 113, the liquid crystal layer 106
The light of the P-wave 108 incident on is converted into the S-wave 109 by the PS conversion 110, so that the light is transmitted through the polarization selective reflection layer B105 and visually recognized. Therefore, light incident on the black display unit 112 can be used for display on the white display unit 113, and peak luminance is generated.

[Other Matters] (1) As the polarization selective reflection layer, a layer that selectively reflects left and right circularly polarized light can be used in addition to selectively reflecting P and S waves that are linearly polarized light. Further, as the polarization selective reflection layer, a layer in which an absorption type polarizing layer is laminated on a layer for performing polarization selection can also be used. At this time, light recycling is performed by using an absorption type polarizing layer on the polarization selective reflection layer. Even if the selectivity of the polarization selective reflection layer is insufficient, non-selective polarized light is absorbed by the absorption type polarization layer, and high contrast is realized without black floating.

(2) In FIG. 5, the liquid crystal layer has a vertical alignment when no voltage is applied, and has an orientation of approximately 45 when a voltage is applied.
A display mode in which white display is performed by tilting is used. The vertically aligned liquid crystal layer has no birefringence for light propagating perpendicular to the substrate and is not polarization-converted. At this time, if the selectivity of the polarization is vertically orthogonal, a black display can be obtained when no voltage is applied.

(3) As the backlight, either a sidelight type or a direct type can be used. FIG. 6 shows a cross-sectional view when a sidelight type backlight is used. Since the light guide mainly used for light recycling and the light guide of the backlight are adjacent to each other with the diffusion layer interposed therebetween, light can be efficiently recycled. By providing a diffusion layer between the light guides, diffused light of surface emission can be substantially incident on the liquid crystal panel, and the uniformity of in-plane luminance is improved.

The light loss in the light guide is very small, usually 1% or less. For this reason, when a light guide having an action of mainly transmitting recycled light is used, the propagated light is effective without being attenuated.

The provision of the light recycling light guide has the following effects. In general, a light guide of a backlight is provided with a concavo-convex structure for uniformly irradiating the backlight of the panel to the back surface of the panel. For this reason, if the light guide of the backlight also serves as a light guide mechanism for the recycled light, the recycled light is scattered by the uneven structure on the back surface, escapes from the back surface, and the recycling efficiency is reduced. For the above reasons, light recycling is efficiently realized by using a light guide whose main purpose is to propagate recycled light.

(4) As a specific application of the liquid crystal display device, for example, it can be used for a liquid crystal television, a liquid crystal monitor, a portable information terminal, a portable telephone, and the like.

[Specific Example 1 Corresponding to Embodiment 6] A specific example 1 corresponding to Embodiment 6 will be described with reference to FIG.
In FIG. 6, reference numeral 205 denotes a lower substrate, 206 denotes an upper substrate,
211 is incident light A, 212 is outgoing light A, 213 is incident light B, 214 is outgoing light B, 215 is a black display unit, and 215 is a white display unit.

On an acrylic light guide A200 disposed adjacent to the lamp 210, a diffusion sheet was disposed as a diffusion layer 201, and a light guide B202 was further laminated. Next, a polarization selective reflection layer A203 for selectively reflecting a P wave was laminated on the light guide B202. As the polarization selective reflection layer, a film composed of an organic or inorganic multilayer film or a cholesteric liquid crystal polymer layer can be used. Next, an absorption type polarizing plate A204 is arranged so as to transmit the P wave. Absorption polarizing plate A
Is used, even if the polarization selectivity in the polarization selective reflection layer is insufficient, the polarized light incident from the backlight side is completely a P wave. In the liquid crystal layer 209 sandwiched between the upper and lower substrates, the liquid crystal has a vertical alignment when no voltage is applied. Therefore, the liquid crystal layer 2
In No. 09, no polarization conversion occurs when no voltage is applied, and the liquid crystal tilts when a voltage is applied, and the polarization is converted from a P-wave to an S-wave. Upper substrate 2
A polarization selective reflection layer B207 that selectively reflects a P-wave and transmits an S-wave, and an absorption-type polarizing plate B208 are stacked on 06. At this time, the absorption type polarizing plate B208 is arranged so as to transmit the S wave. Although not shown, a transparent electrode layer is formed inside the upper and lower substrates, and the liquid crystal layer is driven.

When black-and-white display was performed on the screen through the boundary, peak luminance was observed in which the luminance of the white display increased as the area of the black display increased.

FIG. 7 shows the relationship between the area ratio and the brightness of the white display portion when a white window is displayed at the center of the screen and display is performed while changing the area ratio of black and white display. At this time, as the area ratio of the black display increased, the white luminance increased exponentially. In particular, when the area ratio was 80% or more, the peak luminance was greatly increased, and 1500 nit to 2000 nit was realized.

Next, the area ratio of the black display is fixed at 90%, and a portion having an area corresponding to the black display portion is displayed in gray from black to white (dark display), and the relationship between the gray level and the peak luminance is examined. The results are shown in FIG. At this time, the white display portion has a transmittance of 100%.
Was displayed. The peak luminance decreased as the transmittance of the dark display portion increased and approached white. This is because light other than light necessary for dark gradation display is light-recycled, so that as the transmittance increases, the absolute value of the recycled light decreases, and the peak luminance decreases.

As the liquid crystal layer, in addition to the above vertical alignment,
TN such as horizontal electric field display mode and STN mode of normally black using homogeneous alignment, and 90 ° twist
A mode or the like can also be used.

By using the diffusion layer 201, the lamp 21
0 light can be used as a diffusion surface light source, and in-plane uniformity is improved.

As the light guide B, for example, as shown in FIG. 9A, a light guide in which a layer A 1300 and a layer B 1301 having different refractive indices are formed obliquely is used. At this time, the backlight light 1302 is transmitted through the light guide, and the recycled light 1303 is totally reflected at the interface between the layers, so that it is emitted again from the upper surface side. The emitted light is emitted to the viewing side or reflected as a recycled light by the polarization selective reflection layer of the opposite substrate as appropriate depending on the display state of the liquid crystal layer. By repeating this process, the light incident on the dark display portion is propagated in the panel to the bright display portion.

By providing a groove on the lower surface of the light guide B as shown in FIG. 9B, it becomes possible to confine or emit the propagating light propagating inside. At this time, if the groove is provided on the lower surface side, there is an effect of generating trapped light (recycled light 1307) inside the light guide. The trapped light is
For example, it is possible to emit light from the upper surface side by sequentially changing the propagation direction with a diffusion layer or the like provided on the lower surface side of the groove.

In FIGS. 9A and 9B, 1304
Is a light guide, 1305 is a groove, 1306 is backlight light,
Reference numeral 1307 denotes a recycle light.

In the above example, a color filter is not used, but a color filter can be used. When an absorption type color filter such as a pigment dispersion type is internally provided on the substrate, the polarization selective reflection layer needs to be provided further inside the color filter layer. This is because if absorption light is generated in the color filter layer, the recycling efficiency is reduced.

[Specific Example 2 Corresponding to the Second Embodiment] A specific example 2 corresponding to the sixth embodiment will be described with reference to FIG. FIG. 10 shows an example of a normally black horizontal electric field display mode. In FIG. 10, reference numeral 100 denotes a large light guide,
1001 is a diffusion layer, 1004 is a counter substrate, 1006 is a polarizing plate, 1007 is a lamp, 1008 is a lamp cover, 1
011 is a source line, 1012 is a gate line.

Array substrate 10 having comb-shaped electrode 1014
On 03, the liquid crystal 1013 has a homogeneous alignment. At this time, the orientation direction 1010 of the liquid crystal is substantially perpendicular to the main light propagation direction 1009 in the second light guide 1002.

With the above configuration, the incident light 1016 entering the liquid crystal layer 1015 from the second light guide 1002 is not only perpendicular to the liquid crystal layer 1015 but also parallel to the propagation direction and obliquely transmitted to the liquid crystal layer 1015. Are also less susceptible to phase changes. This is because the angle formed by the incident light 1016 and the orientation direction 1010 of the long axis of the liquid crystal is substantially perpendicular. Therefore, the selective reflection property of the polarization selective reflection layer 1005 during black display is improved, and the generation efficiency of peak luminance is improved.

The same effect can be obtained even if the orientation direction of the liquid crystal is horizontal to the propagation direction. This is because there is no phase difference of the liquid crystal in the propagation direction.

Liquid crystal orientation direction 1010 and propagation direction 100
FIG. 11 shows the relationship between the angle θ formed by No. 9 and the peak luminance.
Note that the peak luminance was normalized by a value of θ of 0 °.

The peak luminance became maximum when θ was 0 ° and 90 °, and became minimum when 45 °. This is because when θ is 45 ° with respect to the light obliquely transmitted through the liquid crystal layer, the phase difference changes the most, and the amount of recycled light decreases.

(Embodiment 7) [Structure and operation principle of liquid crystal display device] FIGS. 12 and 13
FIG. 17 is a cross-sectional view of a backlight according to Embodiment 7 of the present invention and a transflective liquid crystal display device having an opening in a reflective layer. FIG. 12 shows a light path at the time of transmission, and FIG. 13 shows a light path at the time of reflection.

At the time of transmission, the P-wave component of the light A 514 emitted from the lamp 511 passes through the polarization selective reflection layer A and the absorption type polarizing plate A and enters the liquid crystal layer 510. In the black display unit 512, the incident P wave does not undergo polarization conversion,
The light is reflected by the polarization selective reflection layer B508 on the upper surface, enters the light guide B again, and propagates inside. Of the light propagating through the light guide B502, the light incident on the white display portion 513 is the liquid crystal layer 510.
, And is emitted to the viewing side as an S-wave (emitted light A515). At this time, by laminating the absorption type polarizing plate B509 on the upper surface of the polarization selective reflection layer B with their axes aligned so as to pass S-wave, the polarization property is improved and the effect of improving the contrast is obtained. Further, by providing a polarization selective reflection layer on the lower surface side of the absorption type polarizing plate, it is possible to recycle light incident from the back surface. The same applies to the polarization selective reflection layer A 603 on the back side and the absorption type polarizing plate 604.

At the time of reflection, light incident on the black display unit from the outside propagates from the transmission unit through the light guide below the reflective layer and exits from the white display unit. The incident light B614 is transmitted to the transmission unit 61.
8, the light enters the light guide B602 on the back surface, and the light guide B602
The light propagates through the inside and exits from the white display section (the exit light C61).
7).

[Other Matters] (1) In the transflective type liquid crystal display device, the configuration of the reflective portion and the transmissive portion of the pixel is similar to that shown in FIG. 12, except that a transmissive portion is provided at the center of the pixel. As in 14, the reflection portion 1404 may be provided only on the convex portion of the uneven structure of the pixel. The flat region between the convex portions does not contribute to the reflection characteristics because external light is regularly reflected. For this reason, when the transmissive portion 1405 is provided between the convex portions, there is an effect of improving the opening area while maintaining the reflection characteristics. In FIG. 14, reference numeral 1401 denotes a source line, 1
402 is a gate line, 1403 is a pixel.

(2) In addition to a cold cathode tube, a white LED or a color time division type LED backlight can be used for the backlight. In particular, when an RGB color time division type LED light source is used, the effect of improving the luminance at the time of transmission can be obtained.

(Eighth Embodiment) [Structure and Operation Principle of Liquid Crystal Display] FIG. 4 shows the display principle of a liquid crystal display according to a seventh embodiment of the present invention.
The vertical alignment mode is used for the liquid crystal layer
8, a polarization selective reflection layer A 1201 and a polarization selective reflection layer B 1206 are laminated. At this time, at the time of halftone display, the outgoing light A1209 transmitted through the liquid crystal layer at one time and the outgoing light B12 emitted after being reflected by the upper and lower polarization selective reflection layers.
There are ten. This is because at the time of halftone display, S-waves and P-waves are mixed in the liquid crystal layer, so that a transmission light and a reflection light are generated at a fixed ratio in the polarization selective reflection layer. At this time, the optical path length of the emitted light B1210 in the liquid crystal layer 1208 is:
This is twice the output light A1209. Therefore, outgoing light A120
9 and the output light B1210 have different phase differences. For this reason, the outgoing light A1209 and the outgoing light B1210 are averaged at the time of visual recognition, and the effect of reducing grayscale inversion can be obtained by the same principle as that of the multi-domain liquid crystal panel.

[Specific Example Corresponding to Embodiment 8] A transflective liquid crystal display device according to Embodiment 8 will be described with reference to FIGS. 12 and 13. FIG. FIG. 12 shows the path of light when transmitted.
FIG. 13 shows a light path at the time of reflection. In FIG.
05 is a lower substrate, 507 is an upper substrate, 510 is a liquid crystal layer, 51
2 is a black display portion, 514 is incident light A, 515 is outgoing light A, and in FIG.
1 is a diffusion layer, 602 is a light guide B, 603 is a polarization selective reflection layer A, 604 is an absorption type polarizing plate A, 605 is a lower substrate,
6 is a reflection part, 607 is an upper substrate, 608 is a polarization selective reflection layer B, 609 is an absorption type polarizing plate B, 610 is a liquid crystal layer, 611.
Is a lamp, 612 is a black display unit, 613 is a white display unit, 61
4 is an incident light C, 615 is an outgoing light C, and 616 is a transmission part.

In a semi-transmissive liquid crystal panel having an opening, the reflection part 506 of the pixel and the opening 516 have an area ratio of 4
0:60. The reflecting portion was formed using an aluminum alloy, and the opening was formed using a ITO film on a transparent resist. The light guide A500 was arranged adjacent to the lamp 511, and the diffusion layer 501 was stacked on the upper surface. The light guide A was formed using an acrylic resin. The lower surface of the light guide A is provided with dot-like irregularities, and the light of the lamp 511 propagates in the light guide A, is scattered by the dot-like irregularities and is emitted from the upper surface, and diffused by the diffusion sheet on the upper surface. It was made to be a diffusion surface light source. An acrylic light guide B502 was disposed on the diffusion layer 501. Since the light guide B502 has the grooves on the upper and lower surfaces, the recycled light can propagate through the inside and can be sequentially emitted from the white display unit. Light guide B502
A polarization conversion selection layer A 503, an absorption type polarizing plate A 504, etc. are laminated thereon, and a polarization conversion selection layer B is formed on the upper surface of the liquid crystal panel.
508, an absorption type polarizing plate B509, and the like were laminated to form a transflective liquid crystal display device.

The display characteristics were evaluated under room light. At the time of transmission when the lamp 511 is turned on, the light of the lamp is recycled in the black display unit, propagates through the light guide B502, and passes through the white display unit 5.
13 and emitted. In addition, at the time of reflection that turned off the lamp,
Light incident on the black display unit from the outside transmitted through the transmission unit, propagated through the light guide below the reflective layer, and exited from the white display unit. For this reason, peak luminance is generated both during transmission and reflection, and high luminance is achieved.

[0099]

According to the present invention, recycling of backlight light is realized by using the difference in the alignment state of the liquid crystal layer caused by turning on and off the driving, and panel display is performed. Light incident on the panel is recycled to the white display section to achieve peak luminance, and a panel with extremely high luminance is realized.

[Brief description of the drawings]

FIGS. 1A to 1C are cross-sectional views of a liquid crystal panel according to Embodiments 1 to 3. FIG.

FIG. 2 is an explanatory diagram for explaining a display principle of a liquid crystal panel according to a second embodiment.

FIG. 3 is an explanatory diagram for explaining a display principle of a peak luminance.

FIG. 4 is an explanatory diagram for explaining a display principle of a liquid crystal panel according to an eighth embodiment.

FIG. 5 is a cross-sectional view of the liquid crystal display device according to the first embodiment.

FIG. 6 is a cross-sectional view of the liquid crystal display device according to the first embodiment.

FIG. 7 is a graph showing a relationship between a display area ratio and a peak luminance.

FIG. 8 is a graph showing the relationship between the gray scale of dark display and the peak luminance.

FIGS. 9A and 9B are explanatory diagrams illustrating an example of a light guide of a liquid crystal display device of Example 1 corresponding to Embodiment 6. FIGS.

FIG. 10 is a specific example 2 corresponding to the sixth embodiment.
It is explanatory drawing of the liquid crystal display device of FIG.

FIG. 11 is a graph showing a relationship between a liquid crystal alignment direction and a peak luminance.

FIG. 12 is a cross-sectional view of a liquid crystal display device of a specific example corresponding to the eighth embodiment.

FIG. 13 is a cross-sectional view of a liquid crystal display device of a specific example corresponding to the eighth embodiment.

FIG. 14 is a plan view showing an uneven structure of a pixel.

[Explanation of symbols]

 100: Diffusion layer 101: Light guide 102: Polarization selective reflection layer A 103: Lower substrate 104: Upper substrate 105: Polarization selective reflection layer B 106: Liquid crystal layer 107: Backlight 108: P wave 109: S wave 110: PS conversion 111: Diffusion 112: Black display unit 113: White display unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 313 G09F 9/00 336J 324 9/30 349B 336 349E 9/30 349 G02F 1/1335 530 1 / 137 505 F-term (reference) 2H049 BA02 BA03 BA05 BA06 BA42 BA43 BA44 BB03 BC22 2H088 HA13 HA18 JA05 JA10 JA12 MA05 MA07 2H091 FA02Y FA08X FA08Z FA10Y FA19Y FA23Z FA37Z FA41Z FB02 HA07 HA09 HA10 HA10 5CA09 EB AE03 ED11 ED13 ED14 5G435 AA03 BB12 BB15 BB16 CC12 EE27 EE33 FF03 FF05 FF06 FF08 GG12 GG24

Claims (41)

[Claims]
1. A liquid crystal panel having a polarizing layer on both sides of a liquid crystal layer, wherein a polarizing layer positioned on an observer side selectively separates reflection and transmission depending on a polarization state, and the first polarization layer. A liquid crystal panel comprising a second polarizing layer having a higher degree of polarization than the layer.
2. A first polarizing layer that selectively separates reflection and transmission according to a polarization state, wherein the first polarizing layer is positioned on the side opposite to the observer;
2. The liquid crystal panel according to claim 1, comprising a second polarizing layer having a higher degree of polarization than the first polarizing layer.
3. The liquid crystal panel according to claim 1, wherein the second polarizing layer is an absorbing polarizing layer.
4. A polarizing layer located on the viewer side reflects light having the same polarization state as transmitted light of the polarizing layer located on the opposite viewer side, and transmits light having a different polarization state from the transmitted light. 3. The liquid crystal display panel according to claim 2, wherein:
5. The liquid crystal panel according to claim 1, wherein the second polarizing layer is disposed on the first polarizing layer.
6. The liquid crystal panel according to claim 1, wherein the first polarizing layer and the second polarizing layer are provided on an inner side of a substrate located on a viewer side.
7. A color filter is provided on a substrate located on the observer side, and the first polarizing layer of the substrate located on the observer side is arranged on a liquid crystal layer side of the color filter. Item 6. A liquid crystal panel.
8. A color filter is provided on a substrate located on the side opposite to the observer, and the first polarizing layer of the substrate located on the side opposite to the observer is arranged on the substrate side of the color filter. The liquid crystal panel according to claim 6.
9. The liquid crystal panel according to claim 1, wherein the first polarizing layer comprises a Nicol prism.
10. The liquid crystal panel according to claim 1, wherein the first polarizing layer comprises a scattering element.
11. The liquid crystal panel according to claim 10, wherein said scattering element has anisotropy.
12. The liquid crystal panel according to claim 1, wherein the first polarizing layer is formed of a multilayer film having a different refractive index.
13. The liquid crystal panel according to claim 12, wherein said multilayer film has anisotropy.
14. The liquid crystal panel according to claim 1, wherein said first polarizing layer comprises a holographic element.
15. The liquid crystal panel according to claim 1, wherein the first polarizing layer has a structure that reflects either left or right circularly polarized light.
16. The liquid crystal panel according to claim 15, wherein the refractive index distribution of the first polarizing layer has a spiral structure.
17. The liquid crystal panel according to claim 16, wherein the helical structure is made of a cholesteric liquid crystal or a polymer.
18. The liquid crystal panel according to claim 15, further comprising a retardation layer for converting circularly polarized light into linearly polarized light.
19. The liquid crystal panel according to claim 1, wherein the liquid crystal layer is configured such that a phase change of light propagating perpendicular to the liquid crystal layer becomes substantially zero during black display.
20. The liquid crystal panel according to claim 19, wherein the liquid crystal layer is in a vertical alignment mode in which the liquid crystal has a vertical alignment when no voltage is applied.
21. The liquid crystal panel according to claim 19, wherein the liquid crystal layer has a horizontal electric field mode in which the liquid crystal has a homogeneous alignment when no voltage is applied and is driven by a horizontal electric field parallel to the substrate.
22. The liquid crystal panel according to claim 1, wherein the liquid crystal layer is configured such that a phase change of light propagating perpendicularly to the liquid crystal layer is minimized during black display.
23. The liquid crystal panel according to claim 22, wherein the liquid crystal layer is in a twisted nematic mode.
24. The liquid crystal panel according to claim 22, wherein the liquid crystal layer is in a hybrid alignment mode.
25. The liquid crystal panel according to claim 22, wherein the liquid crystal layer is in an OCB mode.
26. A liquid crystal display device having a liquid crystal panel capable of displaying a dark display and a bright display, wherein the light incident on the dark display portion is guided to the bright display portion by a light guide mechanism, whereby the dark display is performed. A liquid crystal display device, wherein at least a part of light incident on a display unit is used for display of the bright display unit.
27. A liquid crystal display device having a liquid crystal panel capable of displaying a dark display and a bright display, wherein a part of light incident on the dark display portion is guided to the bright display portion by a light guide mechanism. The liquid crystal display device, wherein the brighter the brighter the brighter the display the higher the relative display area of the dark display to the bright display.
28. A liquid crystal display device having a liquid crystal panel capable of displaying a dark display and a bright display, wherein a part of light incident on the dark display portion is guided to the bright display portion by a light guide mechanism. A liquid crystal display device, wherein the brighter the brighter the higher the gray level of the dark display, the closer to black.
29. A backlight unit, a liquid crystal panel having a pixel with a reflective part and a transmissive part, and backlight light reflected on the back surface of the reflective part and external light transmitted from the transmissive part to the backlight side. A liquid crystal display device which guides the light to a bright display portion using a light guide mechanism and emits the light from the bright display portion.
30. The liquid crystal display device according to claim 29, wherein the pixel has a concavo-convex structure, and the transmission portion includes a flat portion of the concavo-convex structure.
31. The backlight unit comprises:
30. The liquid crystal display device according to claim 29, which emits B light.
32. A light guide mechanism comprising: the liquid crystal panel according to claim 1; and a light guide disposed adjacent to the liquid crystal panel on a side opposite to a viewer. Item 30. The liquid crystal display device according to item 26, 27, 28 or 29.
33. The backlight unit according to claim 32, further comprising a backlight unit including a light guide having a diffusion layer on a viewer side, and the light guide on a viewer side of the diffusion layer. Liquid crystal display.
34. The liquid crystal display device according to claim 32, wherein the light guide transmits the backlight light and propagates at least a part of the reflected light of the liquid crystal panel inside.
35. The light guide according to claim 34, wherein layers having different refractive indices are obliquely stacked.
The liquid crystal display device according to the above.
36. The liquid crystal display device according to claim 34, wherein the light guide has a structure in which an asymmetric groove is formed on a surface on a backlight side.
37. The liquid crystal display device according to claim 26, further comprising a driving unit, wherein the driving unit performs driving for inserting black display for a predetermined period within a frame period.
38. The liquid crystal display device according to claim 26, further comprising a driving unit, wherein a multiple reflection preventing means is provided.
39. The liquid crystal display device according to claim 29, wherein the backlight is a sidelight type.
40. A liquid crystal display device having a liquid crystal panel, wherein the light incident on the liquid crystal layer is converted into light transmitted through the liquid crystal layer with different optical path lengths by a light guide mechanism, thereby having a plurality of phases. A liquid crystal display device wherein light is emitted in the same direction.
41. The liquid crystal display device according to claim 40, wherein the light guiding mechanism comprises a liquid crystal layer and a polarizing layer for selectively separating reflection and transmission according to a polarization state.
JP2000331133A 1999-10-29 2000-10-30 Liquid crystal panel and liquid crystal display device Pending JP2002090725A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP30990399 1999-10-29
JP2000017721 2000-01-26
JP2000208077 2000-07-10
JP2000-17721 2000-07-10
JP11-309903 2000-07-10
JP2000-208077 2000-07-10
JP2000331133A JP2002090725A (en) 1999-10-29 2000-10-30 Liquid crystal panel and liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000331133A JP2002090725A (en) 1999-10-29 2000-10-30 Liquid crystal panel and liquid crystal display device

Publications (1)

Publication Number Publication Date
JP2002090725A true JP2002090725A (en) 2002-03-27

Family

ID=27480008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000331133A Pending JP2002090725A (en) 1999-10-29 2000-10-30 Liquid crystal panel and liquid crystal display device

Country Status (1)

Country Link
JP (1) JP2002090725A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003091794A1 (en) * 2002-04-24 2003-11-06 Nitto Denko Corporation Light converging system and transmission liquid crystal display
JP2008512731A (en) * 2004-09-13 2008-04-24 ローム アンド ハース デンマーク ファイナンス エーエス Dark state light recycling film and display
JP2008521059A (en) * 2004-11-19 2008-06-19 ローム アンド ハース デンマーク ファイナンス エーエス Dark state light recycling membrane and display
JP2008545172A (en) * 2005-07-04 2008-12-11 ポリアイシー ゲーエムベーハー ウント コー カーゲーPolyIC GmbH & Co. KG Activable optical layer
JP2009031439A (en) * 2007-07-25 2009-02-12 Toshiba Matsushita Display Technology Co Ltd Liquid crystal display

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958421A (en) * 1982-09-29 1984-04-04 Toshiba Corp Liquid crystal display device
JPS6345536U (en) * 1986-09-10 1988-03-28
JPH10501075A (en) * 1994-05-31 1998-01-27 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Display device having a diffusing display panel
JPH1114944A (en) * 1996-09-05 1999-01-22 Fujitsu Ltd Polarizer and projection optical device using the polarlizer
WO1999004313A1 (en) * 1997-07-14 1999-01-28 Citizen Watch Co., Ltd. Liquid crystal display
JP2000147502A (en) * 1998-11-18 2000-05-26 Seiko Epson Corp Liquid crystal device and electronic equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958421A (en) * 1982-09-29 1984-04-04 Toshiba Corp Liquid crystal display device
JPS6345536U (en) * 1986-09-10 1988-03-28
JPH10501075A (en) * 1994-05-31 1998-01-27 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Display device having a diffusing display panel
JPH1114944A (en) * 1996-09-05 1999-01-22 Fujitsu Ltd Polarizer and projection optical device using the polarlizer
WO1999004313A1 (en) * 1997-07-14 1999-01-28 Citizen Watch Co., Ltd. Liquid crystal display
JP2000147502A (en) * 1998-11-18 2000-05-26 Seiko Epson Corp Liquid crystal device and electronic equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003091794A1 (en) * 2002-04-24 2003-11-06 Nitto Denko Corporation Light converging system and transmission liquid crystal display
CN100359387C (en) * 2002-04-24 2008-01-02 日东电工株式会社 Light converging system and transmission liquid crystal display
JP2008512731A (en) * 2004-09-13 2008-04-24 ローム アンド ハース デンマーク ファイナンス エーエス Dark state light recycling film and display
JP2008521059A (en) * 2004-11-19 2008-06-19 ローム アンド ハース デンマーク ファイナンス エーエス Dark state light recycling membrane and display
JP2008545172A (en) * 2005-07-04 2008-12-11 ポリアイシー ゲーエムベーハー ウント コー カーゲーPolyIC GmbH & Co. KG Activable optical layer
JP2009031439A (en) * 2007-07-25 2009-02-12 Toshiba Matsushita Display Technology Co Ltd Liquid crystal display

Similar Documents

Publication Publication Date Title
DE102010053570B4 (en) Transparent liquid crystal display device
US9488859B2 (en) Backlighting system including a specular partial reflector and a circular-mode reflective polarizer
EP1258746B1 (en) High efficiency polarized display
US7525531B2 (en) Method for manufacturing lighting device, image display, liquid crystal monitor, liquid crystal television, liquid crystal information terminal, and light guide plate
JP3457591B2 (en) Liquid Crystal Display
US5157526A (en) Unabsorbing type polarizer, method for manufacturing the same, polarized light source using the same, and apparatus for liquid crystal display using the same
US8149353B2 (en) Visual display unit illumination
CN1277145C (en) Back light unit of display device and liquid crystal display device using it
JP3917417B2 (en) Reflective liquid crystal display
US7027113B2 (en) Liquid crystal display device using dual light units
JP3109102B2 (en) Display device and electronic equipment using the same
US5684551A (en) Reflective type liquid crystal display device with phase compensator and reflector with undulating surface
US5339179A (en) Edge-lit transflective non-emissive display with angled interface means on both sides of light conducting panel
US7738062B2 (en) Liquid crystal display and method of manufacturing the same
JP4856805B2 (en) Optical laminate
CN101075040B (en) Light source device, display device, terminal device, and transparent/scattering state switching element
US6847424B2 (en) Liquid-crystal display and a lighting apparatus
DE69633283T2 (en) Between light-conductive and reflective status optical table
US7006173B1 (en) Liquid crystal display device having particular reflective polarizer
JP4456655B2 (en) Method for forming optical λ / 4 layer for transflective liquid crystal display device
TWI417611B (en) Transparent display device
US6130735A (en) Reflective liquid crystal display device having front scattering films
JP3874224B2 (en) Light guide unit and liquid crystal display device for increasing polarization component
CN1092341C (en) Reflect liquid crystal display device and reflect color liquid crystal display device
US7903194B2 (en) Optical element for lateral light spreading in back-lit displays and system using same

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20070122

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070820

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110208

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110628