JP3118574U - Liquid crystal panel device with side light source module - Google Patents

Abstract

The present invention provides a liquid crystal panel device including a side light source module that can easily control the color rendering property and uniformity of white light of an emitted backlight light source and is excellent in color rendering property and uniformity.
A liquid crystal panel, a light guide plate installed below the liquid crystal panel, a light reflecting piece installed below the light guide plate, a light source module installed beside the light guide plate, and a fluorescent layer, the light source module comprising: A blue light chip and a red light chip, including at least one blue light chip soldered on a circuit board as a blue light emitting light source and one or more red light chips as a red light emitting light source Are installed next to each other, and a fluorescent layer is installed on the blue light chip and the red chip, and the fluorescent layer is mainly excited by blue light to generate excitation light having a wavelength of 500 to 570 nm. Mixed light, which is a mixture of excitation light, blue light, and red light, is emitted outside the fluorescent layer, a light source of white light W is formed, and is emitted from the liquid crystal panel through light guide by the light guide plate and refraction of the light reflecting piece.
[Selection] Figure 1

Description

The present invention relates to a liquid crystal panel device including a side light source module, and more particularly to a liquid crystal panel device including a side light source module excellent in color rendering of a white light backlight source of the liquid crystal panel.

As a typical structure of the combination of the liquid crystal panel and the backlight light source module, for example, there is a Chinese utility model certificate No. M245448 “light source module of liquid crystal monitor”, and the light emitting diode used for the light source is ultraviolet light (UV ) It is composed of LED and fluorescent materials of red, blue and green (R, B, G). The disadvantage is that ultraviolet light destroys the structure of epoxy resin currently used, causing a problem of light attenuation in the last white light, and the brightness of the white light is weakened. In addition, the covering layer of the proposal is composed of a mixture of three kinds of fluorescent powders of red, green and blue, and the ratio of these three kinds of materials and the manufacturing process are difficult to control. is there. Further, claim 5 of the proposal claims that the light emitting diode is a blue LED and the fluorescent powder is a red or green fluorescent material, but the mixing ratio value of red fluorescent powder and green fluorescent powder and the manufacturing process are as follows. Since it is difficult to control and it is difficult to control the uniformity of mixed light (that is, white light), the color rendering property of white light expressed by the liquid crystal panel is not excellent.
Taiwan Utility Model Certificate No. M245448 Taiwan Utility Model Certificate No. M251143 Taiwan Patent Notice No. I228837

The “Liquid Crystal Screen Light Source Device” of the Chinese Utility Model Certificate No. M251143 uses a blue light or a UV light having a wavelength between 202 nm and 500 nm as the light source, and the light source is a red light source. Since the portion of the light spectrum is missing, the color rendering property and uniformity of the white light (that is, the mixed light) mixed by the excitation fluorescent plate is not excellent, and the purity of the white light looks low to human eyes.

The “Light Emitting Device” of the Chinese Patent Publication No. I228837 invented by the inventor of the present invention is a white light emitting diode and uses two light emitting chips (LEDs) of blue light and red light as two light sources. The blue light chip and the red light chip are covered with a fluorescent layer, and the fluorescent layer excites green light by a blue light source to form white light by mixing the green light, blue light and red light. . The proposal effectively overcomes the problems of the ratio value and difficulty in controlling the manufacturing process that occur in the mixing of fluorescent powders of different colors, and replaces the conventional red fluorescent powder using a red light emitting diode. In addition, the design that the fluorescent layer material is a single color material solves the problem that it is difficult to control the mixing ratio value of different colors and the manufacturing process, and further, the single excitation light wavelength (ie, green light wavelength) In addition, the color rendering property of white light obtained by using the mixture of the red light emitted from the red light LED, the excitation light, and the blue light is relatively excellent. However, the proposed embodiment is a new design limited to white light emitting diodes, and cannot be expanded for use in an apparatus combining a liquid crystal panel and a backlight light source module.

The main object of the present invention is to provide a liquid crystal panel device having a side light source module that can easily control the color rendering property and uniformity of white light of an emitted backlight light source and that is excellent in color rendering property and uniformity. There is.

Another object of the present invention is to use the fluorescent layer used in the backlight light source module as an excitation material, to easily control the wavelength of the excitation light, and to control the color rendering and uniformity of white light of the backlight light source of the liquid crystal panel. It is an object of the present invention to provide a liquid crystal panel device including a side light source module that can be easily provided.

Still another object of the present invention is to provide a liquid crystal panel device having a side light source module that can easily replace a light diffusion piece coated with a fluorescent layer and can be easily replaced with a new one. It is in.

As shown in FIGS. 1 and 9, the liquid crystal panel device including the side light source module according to the present invention includes a liquid crystal panel 10, a light guide plate 20 installed below the liquid crystal panel 10, and a setup below the light guide plate 20. The light reflection piece 30, the light source module 40 installed beside the light guide plate 20, and the fluorescent layer 70, of which the light source module 40 is a light emission source of blue light B soldered on the circuit board 42. And at least one blue light chip 55 and one or more red light chips 65 as red light R emission light sources. The blue light chip 55 and the red light chip 65 are installed adjacent to each other. A fluorescent layer 70 is installed on the blue light chip 55 and the red chip 65, and among these, the fluorescent layer 70 is mainly excited by the blue light B, and excitation light G having a wavelength of 500 to 570 nm is generated in the fluorescent layer 70. The The mixed light obtained by mixing the excitation light G, the blue light B, and the red light R is emitted outside the fluorescent layer 70 to form a light source of white light W, and the light guide by the light guide plate 20 and the light reflection piece 30 are refracted. After that, it is emitted from the liquid crystal panel 10.

As shown in FIGS. 1 and 9, the fluorescent layer 70 is disposed on the blue light chip 55 and the red light color chip 65 which are adjacent to each other.

As shown in FIGS. 2 and 8, the light diffusion piece 15 is provided above the light guide plate 20, the fluorescent layer 70 is uniformly applied to the upper surface / lower surface of the light diffusion piece 15, and the solder is formed on the circuit board 42. A transparent resin layer 75 may be provided so as to cover the attached blue light chip 55 and red light chip 65.

As shown in FIG. 8, the blue light chip 55 and the red light chip 65 are installed in the recessed tank 61 of the light reflection cover 60 in an independent state, and the electrode pins 62 and 64 of the two light reflection covers 60 are connected to the circuit board. The distance L between the two light reflecting covers 60 is controlled within 1 mm, and the transparent resin layer 75 is filled on the surface of the recessed tank 61 and the circuit board 42 of the two light reflecting covers 60. To do.

As shown in FIGS. 1, 2, 3, 4, 5, 7, and 9, the fluorescent powder in the fluorescent layer 70 is made of yttrium aluminum garnet or silicates ( SmOn ^4- ) or borate (BxOy ^3- ) material.

As shown in FIG. 9, the blue light chip 55 and the red light chip 65 may be connected to the recessed tank 61 of the same reflective cover 60, and the recessed layer 61 is filled with the fluorescent layer 70 and the two electrodes thereof. The pins 62 and 64 are soldered on the circuit board 42.

As shown in FIGS. 1, 2, 3, 4, 5, 7, and 9, the material of the fluorescent powder in the fluorescent layer 70 is selected from one or two or three of the following combination substances and used in combination. can do:
The fluorescent powder is cerium-activated yttrium (Y) / aluminum (Al) -containing garnet system (YAG: Ce ³⁺ );
Fluorescent powder is europium element active garnet system (YAG: EU ^{2 + / 3 +} );
The fluorescent powder is a terbium element active garnet system (YAG: Tb ³⁺ ).

As shown in FIG. 6, a transparent brightness enhancement film 125 or a prism piece used for brightness enhancement may be additionally provided between the liquid crystal panel 10 and the light diffusion piece 15.

As shown in FIGS. 12 and 13, a plurality of adjacent blue light chips 55 and red light chips 65 can be arranged and soldered on the circuit board 42 in a one-dimensional linear array system in at least one or more rows.

As shown in FIG. 15, a prism surface 156 having a depression angle θ smaller than 90 ° is provided on the lower surface of the light diffusion piece 15.

The liquid crystal panel 10, the light diffusion piece 15, and the light source module 40 shown in FIG. 12 have a relatively small rectangular shape and are suitable for use in a small liquid crystal screen. The liquid crystal panel 10, the light diffusion piece 15, and the light source module 40 shown in FIG. 13 have a long rectangular shape with a relatively large area and are suitable for use in a liquid crystal screen having a larger size.

As shown in FIGS. 1 and 9, the fluorescent layer 70 seals the blue light chip 55 (chip) and the red light chip 65 (chip) of the light source module 40. When the red light chip 65 is soldered into the concave tank 61 of the light reflecting cover 60 as a pair and the electrode pins 62 and 64 are subjected to the action of the electrodes, the blue light chip 55 and the red light chip 65 are driven to drive the blue light B And red light R are emitted simultaneously. Among them, mainly the blue light B excites the fluorescent layer 70 and emits the excitation light G to the fluorescent layer 70. The excitation light G has a wavelength between 500 and 570 nm and can be defined as green light. For this reason, the mixed light in which the blue light B, the red light R, and the excitation light G shown in FIG. 1 are mixed can be defined as white light W, and the white light w is guided and reflected by the light guide plate 20. The light is incident on the light diffusion piece 15 and the liquid crystal panel 10 through the reflection of the piece 30, and the white light W is emitted through the liquid crystal panel 10 to be a backlight light source of the liquid crystal panel 10. This embodiment mainly defines that the fluorescent layer 70 directly covers the blue light chip and the red light chip 65.

The embodiment shown in FIGS. 2 and 12 mainly shows that the fluorescent layer 70 is not limited to sealing the blue light chip 55 and the red light chip 65 but can be installed at different positions. The fluorescent layer 70 is applied on the upper surface of the light diffusing piece 15, and the blue light chip 55 and the red light chip 65 on the light source module 40 are not covered with the fluorescent layer 70. 65 is driven by a circuit to emit blue light B and red light R at the same time. The blue light B and red light R are guided by the light guide plate 20, reflected by the light reflecting piece 30, and evenly diffused by the light diffusing piece 15. Then, the blue light B excites the fluorescent layer 70 to emit the excitation light G, and is mixed with the blue light B and the red light R to form white light W, which is emitted through the liquid crystal panel 10.

In the embodiment shown in FIG. 3, the fluorescent layer 70 is applied to the lower surface of the light diffusion piece 15. Similarly, the blue light chip 55 and the red light chip 65 inside the light source module 40 are not covered with the fluorescent layer 70, and the blue light B excites the fluorescent layer 70 to emit excitation light G to the fluorescent layer 70, and is emitted from the light diffusion piece 15 to mix the blue light B, red light R, and excitation light G to form white light W. The light is emitted through the liquid crystal panel 10.

As shown in FIG. 4, the fluorescent layer 70 can be simultaneously applied on the upper and lower surfaces of the light diffusion piece 15, which is also one of the best embodiments of the present invention.

As shown in FIG. 5, fluorescent powder may be uniformly mixed in the material of the light diffusing piece 15 to form the fluorescent layer 70 on the light diffusing piece 15 at the same time. At this time, the light source module 40 includes the fluorescent layer 70. The blue light B and the red light R emitted from the light source pass through the light guide plate 20, the light reflecting piece 30, and the light diffusing piece 15, and the fluorescent layer formed on the light diffusing piece 15 becomes the blue light B. The excitation light G is excited and white light W, which is a mixture of blue, red, and excitation light (B, R, G), is emitted from the liquid crystal panel 10 to the outside.

As shown in FIG. 6, the brightness increasing film 125 or the prism piece can be added to the upper surface of the light diffusion piece 15 to achieve the purpose of increasing the brightness. In this embodiment, the fluorescent layer 70 is provided in the light source module 40. Provide.

As shown in FIG. 7, as an example of the light source module 40, the blue light chip 55 is installed in the recessed tank 61 of the independent light reflection cover 60, and the red light chip 65 is replaced by another independent light reflection cover 60. At this time, it is desirable to control the distance L between the two in a range of 1 to 2 mm. At this time, the phosphor layer 70 is filled in the concave tank 61 in which the blue light chip 55 is installed, and the red light chip. A transparent resin layer 75 is filled in the recessed tank 61 in which 65 is installed. At this time, as shown in FIG. 1, the light diffusing piece 15 does not have any fluorescent layer 70 applied, and therefore, the light mixture 40 is a mixture of blue, red, and excitation light (B, R, G) emitted from the light source module 40. (That is, white light W) is emitted through the liquid crystal panel 10.

In the embodiment of the light source module 40 shown in FIG. 8, the blue light chip 55 and the red light chip 65 are installed in the recessed tanks 61 of the two independent light reflecting covers 60, and transparent resin is placed in each of the two recessed tanks 61. Layer 75 is filled. In this embodiment, the light source module 40 is not provided with the fluorescent layer 70, and the fluorescent layer 70 is provided on the surface of the light diffusion piece 15 as shown in FIGS. 2, 3, 4, and 5. Thus, among the blue light B and red light R emitted from the light source module 40, the blue light B is applied and provided on the surface of the light diffusion piece 15 as shown in FIG. 2, FIG. 3, FIG. The fluorescent layer 70 is excited, excitation light G is emitted, and white light W is emitted outside the liquid crystal panel 10.

In the embodiment of the light source module 40 shown in FIG. 9, the blue light chip 55 and the red light chip 65 are installed in the recessed tank 61 of the same light reflecting cover 60, and the fluorescent layer 70 is filled in the recessed tank 61. The blue light chip 55 and the red light chip 65 are covered. As shown in FIG. 1, the light diffusing piece 15 is not coated with the fluorescent layer 70. Therefore, the light emitted from the light source module 40 is white light in which blue, red, and excitation light (B, R, G) are mixed. W, which forms the backlight source of the liquid crystal panel 10.

In the embodiment shown in FIG. 10, the blue light chip 55 and the red light chip 65 are soldered directly on the circuit board 42, and the blue light chip 55 and the red light chip 65 are sealed directly with the fluorescent layer 70 or transparent. The resin layer 75 is filled and the blue light chip 55 and the red light chip 65 are sealed. When the blue light chip 55 and the red light chip 65 are sealed in the fluorescent layer 70, the blue light chip 55 and the red light chip 65 are not applied to the light diffusion piece 15 as shown in FIG. Is sealed with the transparent resin layer 75, the fluorescent layer 70 is provided on the light diffusion piece 15 (see FIGS. 2, 3, 4, and 6).

In the embodiment shown in FIG. 11, the blue light chip 55 and the red light chip 65 are provided in the recessed tank 61 of the light reflecting cover 60, and the transparent resin layer 75 is filled in the recessed tank 61. The light source module 40 of this embodiment is not provided with the fluorescent layer 70, and the fluorescent layer 70 is provided on the surface of the light diffusion piece 15 (see FIGS. 2, 3, 4, and 5).

As shown in FIG. 10, an uneven prism surface 156 is provided on the light diffusion piece 15 to achieve the purpose of increasing the luminance.

The main feature of the present invention is that light emitting diodes such as a blue light chip 55 and a red light chip 65 are applied to the light source module 40, and the blue light B and the red light R are applied by using different application / installation positions of the fluorescent layer 70. And to improve the mixing uniformity and color rendering of the excitation light G. Moreover, since the fluorescent layer 70 is made of a single color material and does not need to be mixed with other fluorescent materials of different colors, it is not necessary to consider the problem of the mixing ratio value of different fluorescent powders, and the manufacturing process is easy. Control is possible. In particular, the red light chip 65 of the light source is a light-emitting diode, and the wavelength and intensity of the red light R emitted from it is easy to control.

As described above, the present invention can improve the color rendering property and uniformity of the white light W, which is the backlight light source, in the region of the liquid crystal panel where the side light source acts, and thus novelty, inventive step and industrial use. Because it has both value and meets the requirements for utility model registration, the application is filed here under the law.

It is sectional drawing of Example 1 of this invention. It is sectional drawing of Example 2 of this invention. It is sectional drawing of Example 3 of this invention. It is sectional drawing of Example 4 of this invention. It is sectional drawing of Example 5 of this invention. It is sectional drawing of Example 6 of this invention. It is a fragmentary sectional view of the light source module of this invention. It is a fragmentary sectional view of another Example of the light source module of this invention. It is a fragmentary sectional view of another Example of the light source module of this invention. It is a fragmentary sectional view of another Example of the light source module of this invention. It is a fragmentary sectional view of another Example of the light source module of this invention. It is a three-dimensional view showing a light source module of the present invention. It is a three-dimensional view showing another light source module of the present invention. It is a fragmentary sectional view of another example of the light source module of the present invention. It is sectional drawing of another Example of the light-diffusion piece of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal panel 15 Light diffusing piece 156 Prism surface 125 Brightness enhancement film 20 Light guide plate 30 Light reflecting piece 40 Light source module 42 Circuit board 55 Blue light chip 60 Light reflecting cover 61, 82 Recessed tank 62, 64, 83, 84 Electrode pin 65 Red light chip 70 Fluorescent layer 75 Transparent resin layer 80 Main lead frame B Blue light R Red light G Excitation light W White light L Distance θ Depression angle

Claims (10)

A liquid crystal panel; a light guide plate provided below the liquid crystal panel; a light reflecting piece provided below the light guide plate; a light source module provided beside the light guide plate; and a fluorescent layer, wherein the light source module is a circuit board. And including at least one blue light chip as a blue light emitting light source soldered thereon and one or more red light chips as a red light light source, wherein the blue light chip and the red light chip are in phase with each other. The fluorescent layer is provided on the blue light chip and the red chip, and the fluorescent layer is excited mainly by blue light, and the fluorescent layer emits excitation light having a wavelength of 500 to 570 nm. The mixed light obtained by mixing the excitation light, the blue light, and the red light is emitted outside the fluorescent layer to form a white light source, and the white light source is guided through the light guide plate, It is emitted from the liquid crystal panel through refraction. , A liquid crystal panel device provided with a side light source module. The liquid crystal panel device having the side light source module according to claim 1, wherein the fluorescent layer is provided by sealing the blue light chip and the red chip adjacent to each other. A light diffusion piece is provided above the light guide plate, a fluorescent layer is uniformly applied to either the upper surface or the lower surface of the light diffusion piece, and soldered onto the circuit board. A liquid crystal panel device comprising the side light source module according to claim 1, wherein the side light source module is covered with a transparent resin layer. The blue light chip and the red light chip are separately installed in the self-supporting devices in the recessed tanks of the light reflecting cover, and the electrode pins of the two light reflecting covers are soldered onto the circuit board, respectively. 2. The side light source module according to claim 1, wherein the distance between the reflection covers is controlled to be within 1 mm, and the transparent resin layer is received even if it is filled on the surface of the recess tank of the two light reflection covers and the circuit board. LCD panel device. The fluorescent powder in the fluorescent layer is composed of a material of yttrium aluminum garnet, silicates (SmOn ^4- ), or borates (BxOy ^3- ). A liquid crystal panel device provided with a side light source module. The blue light chip and the red light chip are connected in a recessed tank of the same reflective cover, a fluorescent layer is filled in the recessed tank, and two electrode pins are soldered on a circuit board. A liquid crystal panel device including a side light source module. The material of the fluorescent powder in the phosphor layer is cerium element active yttrium (Y) / aluminum (Al) -containing garnet system (YAG: Ce ³⁺ ); europium element active garnet system (YAG: EU ^{2 + / 3 +} ); 2. A liquid crystal panel device comprising a side light source module according to claim 1, wherein the terbium element active garnet system (YAG: Tb ³⁺ ), one or two or a combination of three of the above mixtures can be used. . The liquid crystal panel device provided with the side light source module according to claim 1, wherein a transparent luminance increasing film or a prism piece used for increasing luminance is provided between the liquid crystal panel and the light diffusion piece. 2. The liquid crystal panel device having a side light source module according to claim 1, wherein a plurality of adjacent blue light chips and red light chips are arranged and soldered on a circuit board in a one-dimensional linear array system. . The liquid crystal panel device comprising the side light source module according to claim 1, wherein a prism surface having a depression angle smaller than 90 ° is provided on a lower surface of the light diffusion piece.

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