Device for generating belt like luminous source and application thereof

Abstract

The invention discloses a band light source generator and its applications, the band light source generator consists of one light guide and at least one light-emitting source, the light guide is a cylinder made of light transmission materials, the surface of light guide has at least one diffusion strip, the other side opposite to this diffusion strip is a circular arc light exit surface; one end surface of light guide covered with a refracting film is defined as the refracting surface, the other end opposite to it is the incident surface, the light-emitting source is arranged on the incident surface of light guide. A plurality of the mentioned strip light source in parallel may be integrated into a light source to provide the adequate and uniform directional light ray, thus the optical films such as diffusion film or prism pieces etc may be omitted, moreover, for its low optical loss, compared with the long light guide, it may provide a uniform light source, so the invention is more suitable for large-size liquid crystal panel.

Description

technical field [0001] The invention relates to a light source device and its application, in particular to a strip light source device for generating directional light and its application. Background technique [0002] Liquid crystal display (LCD) has the advantages of low power consumption, low radiation, thin thickness, light weight, etc., and has gradually replaced the traditional picture tube display, and has become a widely used flat-panel display. The liquid crystal display itself is a non-self-illuminating display device, and it must rely on an external light source to achieve the display effect. The current liquid crystal display system uses a backlight module (Backlight) as an external light source, and the performance of the backlight module light source will directly affect the liquid crystal display. The display quality of the monitor. [0003] The existing backlight module is composed of light source, light guide plate, diffuser, prism sheet, reflector and oth...

AI Technical Summary

Problems solved by technology

The more light-emitting diodes are used, although the uniformity of light output can be improved, the manufacturing cost will also increase, and the point light source will cause serious light loss through multiple couplings of light guide plates and multi-layer optical films, which will increase relatively. The power consumption of the backlight module, therefore, there are still many problems to be solved when applying light-emitting diodes to the backlight module

[0007] U.S. Patent No. 5969343 discloses a linear lighting device applied to image scanners. In order to solve the problem of uneven light caused by the traditional linear light source with multiple LED arrays, a cylindrical guide and A linear light source device composed of a light emitter, the cylindrical guide is made of light-transmitting material, and a light scattering part is provided on a part of the side of the cylindrical guide, and the light emitter is arranged on an end surface of the cylindrical guide , the light emitted by the light emitter enters the interior of the cylindrical guide through the end face, and the light travels inside the cylindrical guide and is continuously reflected by its side. When part of the light enters the light scattering part, part of the light is scattered. Scattered light with an incident angle smaller than the critical angle with respect to the side of the cylindrical guide will enter the air and become illuminating light

The light-scattering part of the cylindrical guide part of the linear lighting device disclosed in the 343 case scatters the total reflected light, scatters the light incident therein to the air, and obtains the radiated light in the main scanning direction, which is applied to a scanner , can improve the problems caused by the linear light source of the traditional scanner array, but the linear lighting device disclosed by it, the incident light is scattered in the air, so the emitted light has no directivity, and cannot be used as a backlight light source of the liquid crystal panel

The disclosed planar light source device uses a plurality of light guide rods and point light sources as the light source unit, and the light emitted by the light source unit is reflected to the light emitting surface of the frame through the reflection plate below. This patent can also provide relatively uniform light, but The design of its frame and reflector actually increases the volume of the backlight module; moreover, the light guide bar only means that the angle between the incident light and the exit surface is below the critical angle, and it will not be completely on the exit surface of the light guide bar. Reflection, and does not propose how to obtain uniform or directional light, therefore, it is still impossible to realize the backlight source of the liquid crystal panel

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