Novel side-light type backlight source device applying wavelength conversion principle

Abstract

Provided is a novel side-light type backlight source device applying a wavelength conversion principle. The device comprises a backlight source and a reflection layer, the backlight source comprises an excitation light source, a wavelength conversion layer and a filter layer which are sequentially arranged in the direction of an optical axis at intervals, and the excitation light source adopts a UV laser light or a short-wavelength blue laser light; the wavelength conversion layer is used for converting the UV laser light or the short-wavelength blue light into a red light, a green light and ablue light for emergence; the filer layer is used for reflecting the UV laser light or the light of a short-wavelength blue light wave band and transmitting the light of a visible light band at the same time; the excitation light source is taken as the side-light type backlight source and arranged at one end of a light guide plate, the reflection layer is arranged on the back surface of the lightguide plate, and a diffusion layer is arranged on the front surface of the light guide plate. The novel side-light type backlight source device has the advantages that in the wavelength conversion type light source where laser is used as an excitation source, the risk which is caused when the laser directly irradiates into the human body is effectively avoided, the damage to human eyes by the near ultraviolet and short-wavelength blue light is avoided, and the problem of light speckle of a display picture caused by the laser light source is solved. The novel side-light type backlight source device takes both safety and display performance into consideration.

Description

technical field [0001] The invention relates to a novel side-light type backlight light source device applying the principle of wavelength conversion, which is used as a backlight light source for a liquid crystal display. Background technique [0002] Laser light sources are currently widely used in the fields of projection and flat panel display. Since the three-color laser technology is not mature, a monochromatic laser + other light sources (LED light source or phosphor stimulated light device) are usually used. [0003] For example, the earliest laser backlight solution announced by Mitsubishi used the form of red laser + blue and green LEDs. Since the red light laser is used as the light source, the red light laser part may cause great damage to human eyes and human health, and at the same time bring speckle noise on the display screen. [0004] For the mixed light source of monochromatic laser + phosphor excited light, blue laser (usually at 440nm-470nm) is used as ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new type of side-light backlight light source device using the principle of wavelength conversion to solve the following problems in the display light source using laser as the excitation source: 1) Due to the short wavelength and high energy, it is easy to cause harm to the human body; 2) The blue light hazard of the display light source; 3) The speckle noise problem of the display screen caused by the direct use of the laser as the display light source

[0008] The advantages of the present invention are: in the wavelength conversion light source with laser as the excitation source, the danger caused by direct laser irradiation on the human body is effectively avoided, and the damage to human eyes caused by near-ultraviolet or short-wavelength blue light is solved, and at the same time, the astigmatism of the display screen is effectively eliminated. spot problem

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