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Display optical-diffusion film and display device using same

A technology of light diffusing film and display device, which can be used in identification devices, instruments, optics, etc., can solve problems such as narrowing of the viewing angle, and achieve the effect of reducing the lamination process, suppressing the generation of blur, and being economically beneficial.

Active Publication Date: 2016-02-17
LINTEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among them, in the display device using the above-mentioned collimated backlight, since the directivity of the image display light is also increased, there is a problem that the viewing angle is significantly narrowed under this premise.

Method used

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  • Display optical-diffusion film and display device using same
  • Display optical-diffusion film and display device using same
  • Display optical-diffusion film and display device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0453] 1. Fabrication of light-diffusing film

[0454] (1) Synthesis of low refractive index polymerizable compound (B) component

[0455] In the container, put 2 moles of isophorone diisocyanate (IPDI) as the component (B1) and 1 mole of polypropylene glycol (PPG) as the component (B2) with a weight average molecular weight of 9200, and 2 moles as the component (B3) After 2 moles of 2-hydroxyethyl methacrylate (HEMA), they were reacted according to a conventional method to obtain polyether urethane methacrylate with a weight average molecular weight of 9900.

[0456] The weight-average molecular weights of polypropylene glycol and polyether urethane methacrylate are polystyrene-equivalent values ​​measured by gel permeation chromatography (GPC) under the following conditions.

[0457] GPC measurement device: HLC-8020 manufactured by Tosoh Corporation

[0458] GPC column: Manufactured by Tosoh Corporation (below, listed in order of passage)

[0459] TSK guard column (guardc...

Embodiment 2

[0511] In Example 2, when coating the composition for light-diffusion films, except having changed the film thickness of the coating layer into 170 micrometers, it manufactured and evaluated the light-diffusion film similarly to Example 1. The internal structure in the obtained light-diffusing film was the same as in Example 1. Figure 4 (a) The column structure of the deformed column shown. In addition, the film thickness was 170 μm, and the measured haze value was 94%. Other obtained results are shown in Figures 16-17 as well as Figure 14 .

[0512] here, Figure 16 It is a conoscopic image when light is incident on the light-diffusing film of Example 2 so that an incident angle (theta)1=0 degrees using a conoscopic lens.

[0513] From the above-mentioned conoscopic image, it can be seen that uniform light that suppresses the linear propagation of the incident light and transmits it is diffused and emitted to the front of the film.

[0514] in addition, Figure 17 I...

Embodiment 3

[0520] In Example 3, when applying the composition for light-diffusion films, except having changed the film thickness of the coating layer into 135 micrometers, it manufactured and evaluated the light-diffusion film similarly to Example 1. The internal structure in the obtained light-diffusing film was the same as in Example 1. Figure 4 (a) The column structure of the deformed column shown. In addition, the film thickness was 135 μm, and the measured haze value was 93%. Other obtained results are shown in Figures 18-19 as well as Figure 14 .

[0521] here, Figure 18 It is a conoscopic image when light is incident on the light-diffusing film of Example 3 so that an incident angle (theta)1=0 degree using a conoscopic lens.

[0522] From the above-mentioned conoscopic image, it can be seen that uniform light that suppresses the linear propagation of the incident light and transmits it is diffused and emitted to the front of the film.

[0523] in addition, Figure 19 I...

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Abstract

Provided are: a display optical-diffusion film capable of efficiently diffusing and projecting, as image display light, emitted light emitted from a collimated backlight and having high directivity onto the front surface of a display device, without causing straight transmission, especially when applied to a display device using a collimated backlight as the backlight for the display panel; and a display device using the same. A single-layer optical-diffusion film or the like having a columnar structure obtained by standing, in the film-thickness direction, a plurality of columnar objects having a relatively high refraction index in a region having a relatively low refraction index, wherein the film thickness of the optical-diffusion film is within the range of 60-700[mu]m, and the haze value is 80% or higher when light from the normal direction of the film surface is incident thereon.

Description

technical field [0001] The present invention relates to a light-diffusing film for a display and a display device using the same. [0002] In particular, when it is used in a display device using a collimated backlight as a backlight of a display panel, it is possible to suppress the linear propagation and transmission of highly directional outgoing light from the collimated backlight and efficiently send it to the display device as image display light. A light-diffusing film for a display that diffuses and emits light from the front, and a display device using the light-diffusing film. Background technique [0003] Conventionally, in a display device, a predetermined image can be displayed using light emitted from a light source (internal light source; backlight unit) provided inside the device. [0004] In addition, in recent years, in order to display images with high frontal contrast while reducing power consumption, it has been proposed to use an internal light source ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02F1/1335G09F9/00
CPCG02B5/0242G02B5/0257G02B5/0278G02B5/0294G02F1/133504G02F1/133606G02B5/02G02B6/0051G02F1/133507G02B5/0236G02B5/0268
Inventor 草间健太郎片桐麦大类知生所司悟藤挂英夫石锅隆宏
Owner LINTEC CORP
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