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Light converging system and transmission liquid crystal display

A light-condensing system and light-concentrating part technology, which is applied to the light guide, light guide, optics and other directions of the lighting system, can solve the problems of increased thickness of the liquid crystal layer, increased cost, reliability of the optical functional layer, and adverse appearance effects.

Inactive Publication Date: 2005-07-27
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of realizing this by using a multilayer structure of materials having different refractive indices and phase differences, the number of layers increases, which is a major cause of cost increase.
In addition, in the case of realizing it with cholesteric liquid crystal, the thickness of the liquid crystal layer increases, which becomes the main cause of cost increase.
In addition to the increase in cost, there is also the possibility of adverse effects on reliability and appearance due to internal residual stress caused by an increase in the thickness of the optical function layer

Method used

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  • Light converging system and transmission liquid crystal display
  • Light converging system and transmission liquid crystal display
  • Light converging system and transmission liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0285] (Manufacturing of the secondary light concentrating element Y)

[0286] As the secondary light concentrating element Y, TiO is used 2 / SiO 2 Evaporated multilayer film bandpass filter with 15 stacked layers. A 50 μm thick polyethylene terephthalate film was used as the substrate, and the overall thickness was about 53 μm. The design drawing of the laminated thickness of the vapor-deposited film is shown in Table 1 below.

[0287] Floor

Material

Film thickness (nm)

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

SiO 2

TiO 2

92.1

130.1

68.3

97.2

63.2

88.2

152.1

92.8

70.7

50.3

148.6

95.8

65.5

96.9

...

Embodiment 2

[0302] (Manufacturing of the secondary light concentrating element Y)

[0303] As the secondary condensing element Y, a cholesteric liquid crystal bandpass filter produced by coating a thin film of a cholesteric liquid crystal polymer was used. This is a combination of a three-wavelength bandpass filter corresponding to the reflection of right-handed circularly polarized light and a three-wavelength bandpass filter corresponding to the reflection of left-handed circularly polarized light. Light transmits, reflects obliquely incident light.

[0304] For the aforementioned cholesteric liquid crystal bandpass filter, the front transmitted light is non-polarized light. This is because the liquid crystal layer is used as a bandpass filter, and transmitted light from a region where polarization is not separated by cholesteric reflection is transmitted in the front direction. Therefore, during the measurement of the light-condensing characteristics, the above-mentioned secondary li...

Embodiment 3

[0324] (Manufacturing of the secondary light concentrating element Y)

[0325] As the secondary condensing element Y, a polarizing element is used in which a retardation plate b1 is provided between two circularly polarized reflective polarizers a1 whose wavelength bands of polarization selective reflection overlap with each other.

[0326] As the circularly polarized reflective polarizer a1, a cholesteric liquid crystal layer of NIPOCS film (PCF400) manufactured by Nitto Denko Co., Ltd. was used.

[0327] Next, a retardation layer (b1: negative type C plate) having a retardation of approximately 0 on the front side and a retardation in the oblique direction was produced using the polymerizable liquid crystal by the following method. As a polymerizable mesogen compound, LC242 manufactured by BASF Corporation was used, and as a polymerizable chiral reagent, LC756 manufactured by BASF Corporation was used. Polymerizable mesogen compound and polymerizable chiral reagent, in orde...

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Abstract

The condensing system of the present invention includes: a backlight system having a light source and a primary condensing part (X) capable of condensing the outgoing light from the light source within ±60° with respect to the front direction, and as a secondary condensing A light concentrating film without a pattern structure of the element (Y). According to such a condensing system, leakage in oblique directions can be effectively blocked, unpleasant coloring can be suppressed, a good display can be obtained, and cost can be reduced.

Description

technical field [0001] The invention relates to a light concentrating system and a transmissive liquid crystal display device. Background technique [0002] Adoption of a vapor deposition type bandpass filter utilizing Brewster angle (for example, refer to German Patent Application Publication No. 3836955 specification), and the selective reflectivity of cholesteric liquid crystal utilizing Bragg (Bragg) reflection Optical films that have angular dependence on transmittance and reflectance (for example, refer to Japanese Patent Application Laid-Open No. 2-158289, Japanese Patent Laid-Open No. 6-235900, Japanese Patent Laid-Open No. 10-321025, etc.), and diffuse light sources to the front The technique of directional focusing is known. By using these optical films, the reflectance changes according to the angle of incidence, and by proper optical design, it is possible to create filters that transmit light only on the front side. The light that cannot be transmitted is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/13363
CPCG02F1/13362G02F2001/133607G02F1/133634G02F1/133607G02F1/1335G02B6/0001
Inventor 原和孝高桥直树宫武稔
Owner NITTO DENKO CORP
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