TW200408890A - Light mixture device, and planar light source device and LCD device using the light mixture device - Google Patents

Abstract

The present invention relates to a light mixture device, and planar light source device and LCD device using the light mixture device. In the light mixture device, lights of three primary colors respectively emitted from light emitting diodes (LEDs) of three primary colors are mixed as a white light source by light mixer and reflector for use as a line light source to output; With the planar light source device of the line white light source provided by the light mixture device, it is able to eliminate bad illumination areas of the light-guide in the planar light source device and further increasing the overall illuminating performance of the planar light source device. When the white light source emitted from the planar light source device is utilized to make the light source pass through the color filter in the liquid crystal display panel of the display device, the gradation feeling and color degree for exhibiting colorful vision can be increased.

Description

200408890

V. Description of the Invention (i) [Technical Field of the Invention] The present invention relates to a light mixing device, a surface light source nesting device and a liquid crystal display device using the device, particularly to mixing independent three primary color LEDs. Light mixing device for generating light with white light, surface light source device using the light mixing device, and liquid crystal display device. [Previous technology] According to the conventional liquid crystal display device, as shown in FIG. 1, it is mainly composed of a display 1 and a surface light source device 2. The display 1 itself cannot emit light, and the required light sources come from the surface light source device. 2, the surface light source device 2 has a light guide plate 20, a reflective surface of the light guide plate 20 is provided with a reflective plate 21, and the light guide plate 20 is disposed adjacent to the end face of the reflective plate 21 with different density and area size The light guide pattern 2 0 1 is provided with a light diffusing element 22 and a light condensing element 2 3 on the light exit surface of the light guide plate 2 0 | and at least the light guide plate 2 0 is provided with a lamp. The source 24 is covered by a reflector 25. In operation, the conventional liquid crystal display device is mainly composed of the light source 24 and the light transmission plate 20, and a part of the light transmission plate 20 passes through the reflection 20 and enters the light guide plate 21 in the light guide plate 20 for reflection. The light-concentrating action of the light source is used to set the pattern 2 0 1 on the end surface of the reflective plate 2 1 when the display 1 performs display. There is a reinforced light guide plate 200408890 V. Description of the invention (2) 2 0 Because of the light source 2 4Effectiveness of uneven light source strength due to distance.

The choice of the light source 24 in the aforementioned surface light source device 2 is shown in Figs. 2 and 3. Generally, it can be a cold cathode lamp tube 241 or LED242 (ie, a light emitting diode). The cold cathode lamp tube 2 41 is a long one. The tubular body can provide linear white light. The LED 2 4 2 can provide a point light source. When the light source is to be white light, the three primary colors R, G, and B (that is, red, blue, and green) Color) after mixing the light, white light will be formed. In operation, at least one set of R242, G, and B primary LEDs 242 are arranged at the light-entering end face 202 of the light guide plate 20. When the light source emitted by each LED 242 is placed on the light guide plate 20, The light incident end face 202 is mixed to form white light, and then travels in the opposite direction to the light incident end face 202 of the light guide plate 20. The mixed light of the three primary color LEDs 2 4 2 is used in the visible spectrum frequency. The low-frequency red light, the intermediate-frequency green light and the high-frequency blue light are shown in Figure 4. The wavelength of the red light is about 6 40 nm, the green light is about 5 2 5 nm, and the blue light is about 4 7 0 nm, so its light source has a larger color gamut and better color saturation. It should have been a very good application. However, after When related industries should be used, still many shortcomings found the following:

1. As shown in Figure 5, the R, G, and B light sources that initially enter the light-entering end face 202 of the light guide plate 20 are still in the action of mixing light, and these light sources must be allowed to enter the light guide plate 20 After traveling a distance in the end surface 2 02, it can be smoothly mixed into white light after mixing with each other. This mixing distance has occupied the light guide plate 2 Ό-an equivalent area, forming an ineffective light emitting area 2 0 4, and the mixing distance is The non-effective light emitting area 2 0 4 cannot be used because it does not have white light, so the light guide plate 2 0 must be designed.

Page 7 200408890 V. Description of the invention (3) Reserve this non-effective light-emitting area 2 0 4 is a situation where the effective light-emitting area of a light guide plate 20 is wasted. On the other hand, it can also be regarded as the effective display area of display 1 Where the shrinkage is. Second, the light source of each primary color LED is mixed by the light guide plate 20 for light guiding and color mixing. When the light source is in the movement, it is easy to lack any one or two light sources when the light source of the three primary colors is in the light guide plate. The light incident surface end 2 0 2 adjacent two side edges 2 0 3 In this case, white light cannot be mixed smoothly, and a residual color phenomenon of incomplete light mixing is formed. The residual color area formed by this residual color phenomenon 2 0 5, which also occupies the light guide plate 20-a considerable area. The area of the residual color area 205 is also not used because it does not have the provision of white light. As mentioned in the first point, the light guide plate 20 effectively emits light. The waste of area is also the lack of effective display area reduction. Therefore, in order to overcome the above-mentioned problems, some practitioners have conceived as shown in Fig. 6. The LED L 2 of R, G, and B is arranged on the light guide end 20 of the light guide plate 20 and the distance L is enlarged. Before the initial light source enters the light guide plate 20, it uses air as a medium to perform light mixing operation within this distance. Although this idea seems feasible, in practice, enlarging the distance L between the LED242 and the light guide plate 20 causes the size of the entire part to be enlarged unnecessarily, and reduces the effective display area to the display area ratio, which is not a solution to the problem. The right means and approaches.

In more recent technologies, LED 3 has been developed as shown in Figure 7. The LED 3 is based on blue light crystals 3 1 and yellow phosphor 3 2, and emits white light by itself. However, this kind of White LED 3 is white light formed by complementary colors. The color gamut formed by the light source has a small performance.

Page 8 200408890 V. In the description of the invention (4), the color filter shown in Figure 7 will make the problem of insufficient layering. This kind of panel can be used as a whole once the panel 1 1 1 1 1 is passed through the light sheet (C〇1 now has poor color and is on the liquid crystal of the display 1). Outgoing emission will change the light efficiency of each color to R, G, and the corresponding light source and configuration will be provided. The light source provided by the LED is converted into the LED source, regardless of the benefit of the 202 light source.

The light that can be emitted by R can be transmitted with a light transmission. However, for this kind of LED, the R and GB color light LE is not easy to be limited when used. If the light source is still provided by a linear light source, There will be light sources between the light sources. What kind of LE is the most recent mixed light is used. This is the emission of L, G, and other sources from R, G, and B. Three and three times the other elements. Figure 7. For the point-like shape, the point itself will be D after the angle of the source is included, and all are 'B's for each color of the ED point. White light cover 4 1 is from the beginning, B is three.' The primary color L is large. Compatible with the light source shown in the eight. ' The light source has a certain led light IL, so the original color L must be converted to ED 4 and it will be shaped. The difficulty is caused by the white light and the surface light uses its angle. Therefore, the light source and the light plate 2 are problematic. The formation surface must be in the guide line. After the light source & light source attribute 4, as shown in Figure 8, the ED is combined into R, G, and b light to form white light ED 4 because the volume of the output of the same light source is extremely large for each cause. Other related Component settings. L E D 3,4, the effect should be good in the source device 2, the problem, and each adjacent application must use the point light, 疋 0's light end face ′ is conducive to Hou Bin, which is also a missing place

200408890 V. Description of the invention (5) [Summary of the invention] The main purpose of the present invention is to provide a light mixing device, a surface light source device and a liquid crystal display device using the device. The main purpose is to separate each red light, The three primary colors of R, G, and B emitted by the green and blue LEDs are mixed to generate a white light source. A secondary object of the present invention is to provide a light mixing device, a surface light source device and a liquid crystal display device using the device, which are mainly composed of R, G emitted from independent red, green, and blue LEDs. The three primary colors of point B and B are mixed to generate a linear white light source.

Another object of the present invention is to provide a light mixing device, and a surface light source device and a liquid crystal display device using the device. The main purpose is to use the light mixing device in the surface light source device to eliminate the light guide plate in the surface light source device. The poor light emitting area improves the overall light emitting efficiency of the surface light source device. Another object of the present invention is to provide a light mixing device, and a surface light source device and a liquid crystal display device using the same. The main purpose is to use the liquid crystal display device when the surface light source device provided with the light mixing device is applied to a liquid crystal display device. When the display is displayed, it has the white light source of the three primary color lights of R, G, and B, which can improve the color display ability.

[Embodiment] In order to make it easier for your reviewers to understand the effect that the present invention can achieve, the following illustrations are illustrated together: First, please refer to FIG. 9. The light mixing device 5 of the present invention is mainly composed of light mixing. The light mixing body 51 is made of a material with good light transmittance, such as glass, thermoplastic resin, etc.

Page 10, 200,408,890 5. Description of the invention (6) The hood 5 2 is a light with reflection function 5 1 1 and a light energy dependent mixture 5 1 5 2 1 is light (G times R, 5 2 of 5 1 The light source of the light source 5 of the light body 5 enters the mixed LE and reflects each of the fruits. It is a white light-emitting reflection film that emits R and color light sources. The end surface 5 1 of the shape body corresponding to the light output end 1 corresponds to Mixed mounting part 5 light (B) Fig. 10, the L color part 5 of the natural light reflects the light end face 12 to the outside 2 3, each, among the light source 1, the inner periphery G, B of 3 light source 2 The L mixed light 5 which emits a mixed color light is emitted. The material is made of 2 and covered with a complex number D 5 of 1 and the application of 2 3 is reflected in the state of each body 5. Each light body has ED and 2 3 The light end, such as metal or light-receiving end-face body 5 2 with full light, has a shape corresponding to the position of the open part surface 5 1 1 with mixed light, the light of red light (R), green light body 5, and (Plural), blue, please refer to G, B, each is embedded with an end face covering 1 light 5 ED 5 three primary color light body 5 D 5 2 the cover 5 shoots R, so that it passes G, B, and faces the light Source of fruit preferred mixing the light plane 51 be bag 2 position of the light 522 and the L E invented in E D 5 2, and the cover member 5512 exposed open since provide a light mixing all time, will to a mixed annulus

After the light is turned on, the ED 51 has a reflection cover of the original shell 1J. When the light receiving end emits 2 3 °, it is covered by the open part of the cover 5 respectively; The total reflection 5 2 3 in the transmission 5 1 can set the original light source surface 5 1 to 2 2 5 2 1, so that the mixed light R, the light end faces R, G of the light source intersect with each other, and the source of the light source is different, Mix 2 emits several reflective reflectors to mix the mixed light 5 1 G and B light of the mixed light, that is, the color 5 1 1 and the B color light are mismixed, which further strengthens the mixing effect and can be sent independently to become white. Into a line

Page 11 200408890 V. Description of the invention (7) Please refer to FIG. 11 again. When the surface light source device 6 uses the light mixing device 5 of the present invention, the light emitting end 5 of the light mixing body 5 1 of the light mixing device 5 is used. 2 corresponds to the light incident end face of the light guide plate 6 1 in the surface light source device 6

At the 6 1 1 position, the length and width of the light exit end 5 1 1 area of the light mixing device 5 are matched with the length and width of the light entrance end 6 1 1 area of the light guide plate 6 1 to meet the surface light source device 6 Accept the best state of the light source from the light mixing device 5, the original point light source of each color that can emit R, G, B color LED 5 2 3, has been mixed by the light mixing body 5 1 to form a white light line When the light source starts to enter the light guide plate 61, the entire area of the light guide plate 61 can receive the available light, and the light source passes the light guide pattern 6 1 2 and the reflection plate 6 of the reflecting surface of the light guide plate 6 1 The reflection action of 2 is subsequently emitted toward the light exit surface of the light guide plate 61, thereby achieving an improvement in the overall light output efficiency of the surface light source device 6. Please also refer to FIG. 12, the light mixing device 5 may be disposed at the lower side end of the surface light source device 6, and the reflection portion 5 2 1 of the reflection cover body 5 2 may be extended with a reflection space, so that the light mixing device may be mixed. After the white light source output from the body 51 is completely emitted, it is input to the light incident end face 6 1 1 of the light guide plate 61.

In addition, as shown in FIG. 13, the light-emitting end face 5 1 2 of the light-mixing body 5 1 may be connected to the light-incident end face 6 1 1 of the light guide plate 6 1. In addition to forming and covering the body, the effect of light source reflection and guidance can also be achieved. In addition, regardless of the shape of the light mixing body 51, if the length of the light receiving end 5 1 1 to the light output end 5 1 2 in the light mixing body 5 1 is controlled, different light mixing effects can be obtained, especially for different materials. Mixed body 5 1 and different

Page 12 200408890 V. Description of the invention (8) L E D of the light angle to meet the best mixed light performance. As shown in FIG. 14, with the setting of the light mixing device 5, the original independent card can emit red light, green light, blue light R, G, and B LEDs 5 2 3, and the light sources emitted by them can be mixed into light. White light, this white light source has the three primary colors R, G, and B in the light source. It is a light source with a large color gamut and excellent color saturation. When the surface light source device 6 provides this light source for use by a liquid crystal display device, this light source After passing through the color filter 71 of the display 7, the color display of the display 7 can be more layered and the colors can be more beautiful during the display, thereby achieving better visual effects.

In summary, the light mixing device of the present invention, and the surface light source device and the liquid crystal display device using the device, are obtained by mixing the three primary color lights independently emitted by the three primary color LEDs (light emitting diodes) into white. The light source is the output of the linear light source; and the surface light source device of the linear white light source provided by the light mixing device is used to eliminate the defective light emitting area of the light guide plate in the surface light source device, thereby improving the overall light output efficiency of the surface light source device; The white light source emitted by the surface light source device, when the light source passes through the color filter in the liquid crystal panel of the display in the display device, enhances the sense of layering and vividness of the color visual display, which is in line with the industrial availability, novelty and For progressiveness, you should submit an application for an invention in accordance with the law. I would like to ask your reviewing committee for your detailed examination. The benefit is for the examination of the granted patent.

Page 13 200408890 Brief description of the drawings 1. Description of the drawings Fig. 1 is a simple schematic diagram of a conventional liquid crystal display device. FIG. 2 is a schematic diagram of a light source of a conventional surface light source device. FIG. 3 is a schematic diagram of another light source of the conventional surface light source device. Figure 4 is the emission spectrum of the three primary colors L E D of R, G, and B. Figure 5 is a schematic diagram of the mixed light situation in Figure 3. Figure 6 shows another configuration of the conventional R, G, and B primary color LEDs and light guide plate. Fig. 7 is a sectional view of a conventional white light LED.

Figure 7 is a schematic diagram of the use state of Figure 7. FIG. 8 is a schematic diagram of another conventional white light LED. Fig. 9 is an exploded perspective view of the mixed light equipment of the present invention. FIG. 10 is a sectional view of the light mixing device according to the present invention after being assembled. Fig. 11 is a schematic diagram of the light mixing device of the present invention used in a surface light source device. Fig. 12 is a schematic diagram of an embodiment in which the light mixing device of the present invention is applied to a surface light source device.

Fig. 13 is a schematic diagram of another embodiment of the light mixing device of the present invention used in a surface light source device. Fig. 14 is a schematic diagram of a liquid crystal display device in which the light mixing device of the present invention is applied to a surface light source device. 2. Description of drawing number 1 Display 1 1 LCD panel 1 1 1 Color filter 2 Surface light source device 20 Light guide plate 201 Light guide pattern

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Claims (1)

200408890 6. Scope of patent application 1. A light mixing device is composed of a light mixing body and a reflection cover, which is characterized in that: the light mixing body has a light receiving end and a light emitting end; and the reflection cover is formed by a shape capable of covering the light mixing body. The shape is an open part corresponding to the position of the light-emitting end face of the mixed body, so that the light-exited end face of the mixed body is exposed, and a plurality of embedded parts are provided corresponding to the position of the light-receiving end face corresponding to the mixed body In order to set a plurality of independently emitting light emitting diodes (LED), such as red light, green light, blue light. 2 · A light mixing device as described in item 1 of the scope of the patent application, wherein the light mixing system is made of a translucent material such as glass or thermoplastic resin. 3. A light mixing device as described in item 1 of the scope of the patent application, wherein the reflecting cover system is made of a metal, an optical film with a reflective function. 4 · A surface light source device, comprising: a light mixing device as described in item 1 of the patent application scope, and a light input end of a light guide plate in the surface light source device receiving a light source output from the light mixing device. 5 · A surface light source device as described in item 4 of the scope of the patent application, wherein the light mixing system of the light mixing device can be set at the lower end of the surface light source device, and the open part of the reflection cover of the light mixing device is It is extended to have a reflection space. After the light source is emitted from the mixed light body, it is reflected and can be input into the light guide plate. 6 · A surface light source as described in item 4 of the scope of patent application, Page 16 200408890 6. Scope of patent application Among them, the light-emitting end face of the light-mixing body in the light-mixing device is directly connected to the light-entry end face of the light guide plate in the surface light source device. 7. A liquid crystal display device, comprising: a surface light source device as described in item 4 of the scope of patent application; and a liquid crystal panel that receives light from the surface light source device. ❿ Page 17