CN2593227Y - Light source module of liquid crystal display - Google Patents

Abstract

An improved structure of light source in light source module (light module) using Light Emitting Diode (LED) as light source for liquid crystal display panel (LCD panel) can generate three-wavelength white light by including uniform mixed fluorescent powder in Light Guide Plate (LGP) or light guide bar (LGS) of light source module and exciting the mixed fluorescent powder by ultraviolet light emitting diode (UV LED), and replace NICIA white LED as light source to reduce production cost and increase color expression of LCD.

Description

Light source module for liquid crystal display

technical field

The utility model relates to a light source module of a liquid crystal display panel (LCD Panel), in particular to an improved structure of a light source used in a light source module (light module) of a liquid crystal display panel and using a light emitting diode (LED) as a light source, capable of By including uniform mixed phosphor powder in the light guide plate (LGP) or light guide rod (LGS) in the light source module, and then exciting the mixed phosphor powder through ultraviolet light-emitting diodes, white light with three wavelengths is generated, replacing NICHIA's white LED Used as a light source to reduce production costs and increase the color performance of liquid crystal displays.

Background technique

Traditional liquid crystal displays are not as dazzling as light-emitting diodes because of the numbers or patterns displayed, so they look very elegant visually. However, the disadvantage of the liquid crystal display is that it does not emit light itself, so it is necessary to provide an additional light source module so that the image can still be displayed on the screen when there is no light in the external environment.

In the front light source module 100 of the liquid crystal display panel, the principle of light guide with light-emitting diode (LED) 102 as the light source is that the light is first guided into the light guide rod (LGS) 104 by the LED 102, and then the light is guided into the light guide plate by the light guide rod 104. (LGP) 106, and finally guide the light to the surface of the liquid crystal display panel 108. The traditional front light source module structure and the schematic diagram of the path of the light in the structure are shown in Figure 1A and the arrow in Figure 1B, wherein the LED light source is used The dual-wavelength white light LED protected by Nichia's patent is shown in Figure 2.

What Fig. 3 shows is the backlight source module 300 of liquid crystal display panel, and its light-guiding principle with light-emitting diode (LED) 302 as light source is that light is led into light guide plate (LGP) 306 by LED 302, through reflector sheet (reflector sheet) 305, A diffuser sheet (diffuser sheet) 307, a prism sheet (prism sheet) 309, and finally guide the light to the surface of the liquid crystal display panel 308. The schematic diagram of the path of the light in the structure in the traditional backlight module is shown by the arrows in Figure 3 , the same as above, the LED302 light source is a dual-wavelength white light LED protected by Nichia's patent, as shown in the second figure.

The so-called white light is a mixture of multiple colors. In the form of white light that can be seen by human eyes, at least two kinds of light are mixed, two-wavelength light (blue light + yellow light) or three-wavelength light (blue light + green light + red light) light), the currently commercialized products include two-wavelength blue light single chip plus yellow (YAG) phosphor powder, and three-wavelength light that is more promising in the future, which is based on ultraviolet light chip plus red, blue and green (RGB) three In addition to color phosphors, organic single-layer three-wavelength white LEDs also have the advantages of low cost and easy fabrication.

In terms of technology, white LEDs are currently mainly divided into two types of light-emitting methods: the current main commercialization method is that NICHIA uses a 460nm wavelength InGaN blue light-emitting tube 402 to coat a layer of YAG fluorescent material 404, and then uses blue LEDs to irradiate this fluorescent material. Generate 555nm wavelength yellow light complementary to blue light, and use the lens principle to mix the complementary yellow light and blue light to obtain the white light required by the naked eye, as shown in the fourth figure of the white LED structure diagram. The second is the white light LED developed by Japan's Sumitomo Electric with ZnSe as the material. White LEDs are used for lighting or as light sources for LCD panel light source modules, and their prospects have attracted global attention. Advanced countries such as Europe, the United States, and Japan have invested a lot of manpower and established special institutions to promote the research and development of white LEDs. At present, the key technology of white light LED - the patent right of blue light technology is in the hands of a few manufacturers such as Nichia, which makes it difficult for Chinese manufacturers who are proficient in mass production and lower costs to enter. Therefore, white light LED is currently subject to the price promotion dilemma. As far as the panel light source module manufacturers are concerned, the production cost cannot be reduced due to the high unit price of white LEDs.

Utility model content

In view of the above-mentioned background technology, the traditional LCD panel light source module uses the white LED protected by Nichia patent as the light source for light guide, so that the production cost cannot be reduced under the high competition in the market. The utility model provides a Instead of the light source module using white LED as the light source, by including a uniform phosphor layer on the light guide plate or light guide rod, the traditional ultraviolet LED can be used as the light source to excite the mixed phosphor to achieve the effect of white light.

An object of the present invention is to provide a light source module for an LCD panel, which avoids using white LEDs protected by Nichia patents as light sources, thereby reducing production costs.

According to the purpose described above, the utility model provides a device to replace the white LED light source of the LCD panel light source module, which includes a uniform phosphor layer in the light guide rod or light guide plate in the structure of the LCD panel light source module , so it only needs to use the traditional ultraviolet LED as the light source, and achieve the effect of producing white light by exciting the mixed phosphor powder.

According to the above idea, the LCD panel light source module can be a front light source module or a back light source module.

According to the above idea, the white light can be produced by cooperating LED light-emitting tubes emitting UV light and fluorescent powders containing RGB fluorescent substances.

According to the above idea, the white light can be produced by cooperating the LED light-emitting tube emitting purple light and the fluorescent powder containing RGB fluorescent substances.

According to the above idea, the white light can be produced by cooperating the LED light-emitting tube emitting blue light and the fluorescent powder containing RG fluorescent substance.

The purpose of this utility model is achieved in that a kind of LCD front light source module is provided, comprising:

a light emitting diode (LED);

A light guide rod (LGS) for receiving the light emitted from the light-emitting diode, wherein the light guide rod includes a uniform phosphor layer, and when the light passes through the phosphor layer, white light can be excited; and

A light guide plate accepts the white light emitted from the light guide rod.

The utility model also provides an LCD front light source module, comprising:

a light emitting diode (LED);

a light guide rod (LGS) to receive the light emitted from the LED; and

A light guide plate accepts the light emitted from the light guide rod, wherein the light guide plate contains a uniform phosphor layer, and when the light passes through the phosphor layer, white light can be excited.

The utility model further provides an LCD backlight module, comprising:

a light emitting diode (LED);

A light guide plate accepts the light emitted from the light-emitting diode, wherein the light guide plate contains a uniform phosphor layer, and when the light passes through the phosphor layer, white light can be excited.

The utility model has the advantages of not using high-cost white light emitting diodes, and can obtain good effects.

In order to make the above description and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically listed below together with accompanying drawings for detailed description.

Description of drawings

1A to 1B are structural diagrams of a front light source module of a traditional LCD panel;

Figure 2 is a spectrum diagram of a dual-wavelength white light LED protected by Nichia's patent;

FIG. 3 is a structural diagram of a traditional LCD panel backlight module;

Fig. 4 is a structural diagram of a white LED;

5A-5B are structural diagrams of the light source module in front of the LCD panel using the light guide rod to contain a uniform phosphor layer in the present invention; and

6A to 6B are structural diagrams of the front light source module of the LCD panel using a light guide plate containing a uniform phosphor layer of the present invention.

FIG. 7 is a structural diagram of the LCD panel backlight module using a light guide plate containing a uniform phosphor layer in the present invention.

Symbol Description:

100: Traditional front light module

102, 302: White LED

104, 504: light guide rod

106, 306, 506, 606, 706: light guide plate

108, 308, 508, 708: LCD panel

300: traditional backlight module

305, 705: reflector

307, 707: Diffusion plate

309, 709: Prism plate

402: blue light emitting tube

404: YAG fluorescent substance

500: the front light source module of the utility model

502, 702: Ultraviolet (UV) LEDs

700: the backlight module of the utility model

Detailed ways

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