JP3126875U - Rear projection LCD backlight illumination device - Google Patents

Abstract

Provided is a rear projection type LCD backlight illuminating device in which light is uniformly scattered on an LCD using an LED as a light source so that the LCD can express a hue of high brightness and high saturation.
A rear projection type LCD backlight illumination device mainly includes an LCD, an LED illumination module, and a reflecting prism module. The LED lighting module is mounted on the rear surface of the LCD, and is formed by arranging a plurality of LED units on a flat plate. Each LED unit has a light emitting point installed on one side facing the flat plate LCD, provided with several light transmitting holes on the flat plate around the light emitting point, and the light transmitting A light guide lens is packaged on one side of the hole facing the LCD.
[Selection] Figure 3

Description

  The present invention relates to a rear projection type LCD backlight illumination device, and more particularly to an LCD backlight illumination device that can be assembled in a modular manner, is easy to manufacture and maintain, and can express uniform and saturated brightness and color. Is.

The current LCD backlight illuminating device mainly uses white light CCFL (cold cathode tube), and the CCFL is installed behind the LCD to emit and project light on the LCD so that the LCD screen appears.
As the size of the LCD grows, so does the demand for CCFLs and drive circuits. In order to achieve a large-size LCD backlight illumination function, a large number of CCFLs must be connected in series and in parallel, however, due to innate elements, CCFLs have the following disadvantages:
1. The brightness of the CCFL is uneven, and even when a maximum number of CCFLs are connected in series and in parallel, the brightness obtained is still not uniform within the LCD size range, and is particularly noticeable in a large-size LCD.
2. The lifespan of CCFL is short, and when it is used for about 4,000 to 6000 hours, the brightness begins to attenuate, and it is not easy to replace, and the service life of LCD is greatly shortened.
3. CCFL lacks color saturation, its color temperature is about 4800K, so it only meets 80% of the color gamut specified in NTSC, especially the red color expression is bad and can not meet high color needs, for example When measuring with a meter or in an environment that requires a specific color expression, the color defect is clearly seen.
4). The power consumption of CCFL is relatively large, and mercury, which is a harmful substance at the time of manufacture, is included, which is obviously harmful to environmental protection.
Therefore, the use of other backlight light sources is an inevitable trend in LCD development. Currently, the technology that is universally adopted in the industry is that LED is used as a backlight light source, and LED is applied to a small size LCD screen for a certain period of time. In recent years, with the improvement of technology, the brightness of LEDs has greatly improved, and in addition, it is light and solid, has a relatively long lifetime, and has a fast start-up response, so it has become the target of many large-size LCDs. .

In general, in the installation method using LEDs as LCD backlight light sources, unequal quantities of LEDs are mounted on one or both sides of the LCD, and when the power is turned on, the LED light source projects onto the LCD and displays the image on the LCD. . However, general LED rays do not scatter uniformly, concentrate within a small range, and are particularly bright in areas where the LED projection rays on the LCD are present. On the other hand, there is a clear attenuation of brightness around the bright areas. And the color is not evenly expressed.
Note that the above-described LCD device cannot be replaced alone when the elements of some backlight devices are damaged, and the entire device must be replaced, resulting in an increase in cost. And for large size LCDs, it is not only wasteful to replace a single element that is damaged, but LCD waste also increases the burden of environmental protection.

  In view of the above, the inventor of the present invention, as a result of considering the solution, when taking a method of closely arranging LEDs behind the LCD, the brightness range of any two LEDs are overlapped and mixed, and the overall brightness And realized that the color can be expressed uniformly. However, as described above, the light emission method of the general LED does not scatter the light uniformly, so the inventor studied the problem of how to adjust the light emission pattern of the LED, and finally, through long-term research and development and experiments, We have succeeded in research and development of a rear projection LCD backlight illumination device according to this plan.

A main object of the present invention is to provide a rear projection type LCD backlight illumination device in which an LCD is capable of expressing a high brightness and high saturation hue by using an LED as a light source and uniformly scattering light rays on the LCD. is there.
Another object of the present invention is to develop a combined LCD production model, mass-produce a single small-sized backlight illumination device, and combine several small modules as needed to make a large-size LCD It is an object of the present invention to provide a rear projection type LCD backlight illumination device that can reduce waste on the production line and at the same time improve the acceptance rate of a large size LCD.
Another object of the present invention is to combine the LCD with several small modules so that if a single element breaks down, the damaged module can be replaced directly and maintenance of the large LCD can be performed. Another object of the present invention is to provide a rear projection type LCD backlight illumination device.

  A rear projection type LCD backlight illumination device that can achieve the above-mentioned object mainly includes an LCD, an LED illumination module, and a reflection prism module. The LED lighting module is mounted on the back surface of the LCD, and is formed by arranging a plurality of LED units on a flat plate. Each LED unit includes a light emitting point, several light transmission holes, and a light guide lens. The light emitting point is installed on one side facing the LCD of a flat plate, several light transmission holes are arranged on the flat plate around the light emitting point, and the light guide lens transmits the light. Packaged on one side facing the LCD of the hole. The reflection prism module is installed on the back surface of the LED illumination module, and is formed by arranging a plurality of prisms on a base plate. In this way, when the LED unit is activated, the light emitting point emits a light beam toward the prism, a reflective surface is installed on the surface of the prism, and when the light beam hits the reflective surface, the light is reflected, and The light beam is guided through the light transmission hole, and finally the light beam is uniformly projected onto the LCD by the light guide lens.

  According to the present invention, high brightness and high saturation color can be expressed on the LCD, the manufacturing cost can be reduced, the production pass rate of the large LCD can be improved, and the maintenance can be facilitated. Suitable for

  As shown in FIGS. 1 to 3, the present invention provides a rear projection LCD backlight illumination device, and mainly includes an LCD 1, an LED illumination module 2, and a reflecting prism module 3. The LED lighting module 2 is mounted on the back of the LCD 1 and the reflecting prism module 3 is installed on the back of the LED lighting module 2, whereby the LED lighting module 2 can emit a light source. Then, the light is uniformly reflected on the LCD 1 via the reflecting prism module 3, and the LCD 1 is made to express a brighter and more uniform screen.

  The LED lighting module 2 is formed by arranging a plurality of LED units 21 on a flat plate 22. Each LED unit 21 has a light emitting point 211, several light transmitting holes 212, and a light guide lens 213. The flat plate 22 is formed by merging a positioning plate 221 and an electric circuit plate 222. The light emitting point 211 is installed on one surface of the electric circuit board 222 facing away from the LCD 1, that is, the light beam is emitted backward, and the conductor 214 is arranged on the electric circuit board 222 in series / parallel. By conducting the above, the function of the LED unit 21 is made conductive. The several light transmission holes 212 are arranged on the wall surface of the electric circuit board 222 around the light emitting point 211, and the several light guide lenses 213 face one surface of the LCD 1 corresponding to the light transmission holes 212. The light guide lens 213 packaged on the positioning plate 221 has a biconvex lens structure, and one end thereof is fitted in the light transmission hole 212. The reflecting prism module 3 is formed by arranging a plurality of prisms 31 on a base plate, and each prism 31 corresponds to one LED unit 21.

  In this way, when the LED unit 21 is activated, the light emitting point 211 emits a light beam toward the prism 31. The reflection surface 32 is installed on the surface of the prism 31, and when the light beam hits the reflection surface, The light is reflected and guided through the light transmission hole 212, and finally, the light is uniformly projected onto the LCD 1 by the light guide lens 213. Since the light guide lens 213 has a biconvex lens structure, the light distribution surface can be made larger and more uniform. In order for the reflection of the light beam to have the maximum effect, the reflection surface 32 on the surface of the prism 31 is adjusted so as to correspond to the light transmission hole 212 on the LED unit 21 in front, so that each reflection surface 32 is adjusted. Corresponding light transmission holes 212 can be provided. The reflecting surface 32 on the surface of the prism 31 may be made of a highly reflective mirror material, and the light guide lens 214 may be made of a material having a high transmittance. I don't give a luxury here because there is no.

  Referring to FIG. 4, in order to facilitate the manufacture and maintenance of a large size LCD, the LCD backlight illumination device according to the present invention is designed as a module, that is, the LED illumination module 2 and the reflecting prism module 3 are united. When a standard small size design is required and a large display area is required, several small LED lighting modules 2 and reflecting prism modules 3 can be combined with required dimensions to meet the needs.

  Referring to FIGS. 5 and 7, the LED units 21 on the flat plate 22 may be arranged in a side-by-side arrangement or a cross-type arrangement, and when a cross-type arrangement is adopted, the unit area on the flat plate 22 is referred to. By installing a larger number of LED units 21, a brighter screen and a more saturated color can be provided.

Incidentally, in the LCD combination method as shown in FIG. 4, there is a clear gap between any two flat plates 22, the light receiving effect at the edge is relatively weak, and the uniformity of the light is an error. May occur. Accordingly, as shown in FIGS. 6, 8, and 9, in the present invention, the mounting edge 223 is installed around the flat plate 22, and any two flat plates 22 can be joined by the mounting edge 223. I did it. Adopting the design of the mounting edge 223 further stabilizes the connection between any two flat plates 22, and the two flat plates 22 fit deeply into each other, so that the two flat plates The gap between 22 becomes comparatively inconspicuous, the light rays are projected uniformly, and the demand for the device can be achieved.
The light emitting point 211 is a light emitting unit that emits bright white light and may be formed of light emitting units of the three primary colors of red, green, and blue, or of course, may be formed of light emitting units of many other colors.

  The foregoing has been a detailed description of the possible embodiments of the invention, but these embodiments are not intended to limit the scope of the invention and are made without departing from the spirit of the invention. All equivalent implementations or modifications are intended to be included within the scope of the present claims.

FIG. 3 is a perspective view of an installation example of an LCD illumination module and a reflection prism module according to the present invention. It is an example of arrangement of light emitting points and light transmission holes of the LCD illumination module according to the present invention. It is an operation principle diagram of the present invention. It is a large-sized LCD combination example figure of this invention. FIG. 3 is a diagram illustrating an installation example of a row type LED unit according to the present invention. It is an installation example figure of the column type LED unit attachment edge of this invention. It is a cross-sectional type LED unit installation example figure of this invention. It is an installation example figure of the cross type LED unit attachment edge of this invention. It is a combination example figure of the attachment edge of this invention.

Explanation of symbols

1 LCD
2 LED illumination device 21 LED unit 211 Light emitting point 212 Light transmission hole 213 Light guide lens 214 Conductor 22 Flat plate 221 Positioning plate 222 Electric circuit board 223 Mounting edge 23 Reflective prism module 31 Prism 32 Reflecting surface

Claims (8)

An LED illumination module and a reflective prism module;
The LED lighting module is formed by arranging a plurality of LED units on a flat plate, and the LED unit is mounted on the back of the LCD and installed on one surface of the flat plate facing the LCD. A light transmission hole is installed in a flat plate around the light emission point, and a light guide lens is packaged on one side of the light transmission hole facing the LCD,
The reflection prism module is formed by arranging a plurality of prisms on a base plate, and is installed on the back of the LED illumination module. Each prism corresponds to one LED unit. It is characterized by
Rear projection LCD backlight illumination device.   2. The rear projection type LCD backlight according to claim 1, wherein a reflection surface is provided on the prism surface, and a light reflection direction of the reflection surface corresponds to a light transmission hole on the LED unit. Lighting device.   2. The rear projection type LCD backlight illumination device according to claim 1, wherein the light guide lens is a biconvex lens, and one end of the light guide lens is fitted in a light transmission hole of a flat plate.   The rear projection type LCD backlight illumination device according to claim 1, wherein the light emitting point is a light emitting unit of high brightness white light.   The rear projection type LCD backlight illumination device according to claim 1, wherein the light emitting point is a light emitting unit of three primary colors of red, green, and blue.   The rear projection type LCD backlight illumination device according to claim 1, wherein the LED unit has a row arrangement on a flat plate.   The rear projection type LCD backlight illumination device according to claim 1, wherein the LED unit has a crossed arrangement on a flat plate.   The rear projection type LCD backlight according to claim 1, wherein a mounting edge is installed around the flat plate so that any two flat plates can be joined by the mounting edge. Lighting device.

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