Diffusion plate, surface light source device and transmission type display device

A diffuser plate and surface light source technology, which is applied in the field of transmissive display devices, can solve the problems of optical axis deviation, low light utilization efficiency, light intensity spots, etc., achieve correction and convergence of light emission directions, improve diffusion characteristics, and improve The effect of transmittance
CN1683974AInactive Publication Date: 2005-10-19DAI NIPPON PRINTING CO LTD
3 Cites 13 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Publication Date
2005-10-19
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A diffusing sheet, a surface light source unit, and a transmission type display that can attain uniform illumination so that the brightness of light on the display screen appears uniform regardless of the position from which the display screen is observed. The diffusing sheet includes, on its light-emerging side surface, a diffusion lens array having a plurality of unit lenses, each unit lens being in a shape equivalent to a part of an elliptic cylinder having an elliptical cross section. The surface light source unit includes the diffusing sheet and a convergent sheet 12 that has a plurality of unit lenses 121 having almost trapezoidal cross sections, formed on one surface thereof. It is possible to attain uniform illumination by diffusing light from cathode ray tubes in the surface light source unit, and, at the same time, to converge the light serving as backlight to enhance optical efficiency.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a display device such as a liquid crystal display device, particularly a diffusion plate used in a surface light source device for illuminating a transmissive liquid crystal display device from the back, a surface light source device, and a transmissive display using the same device. Background technique

[0002] As a surface light source device for illuminating a transmissive liquid crystal display device or the like from the back, various types of surface light source devices have been proposed and put into practical use. Such surface light source devices are mainly classified into edge-lit type and direct-light type according to the method of converting a non-surface light source into a surface light source.

[0003] Among them, for example, a direct-type surface light source device utilizes cathode line tubes arranged side by side to directly introduce light from the rear side of a transmi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More