JP3127478U - Conical prism type LCD backlight illumination device - Google Patents

Abstract

To provide a conical prism type LCD backlight illumination device in which an LCD can exhibit high brightness and high saturation color.
A conical prism-type LCD backlight illumination device comprising an LCD, a plurality of LEDs, and a heat dissipation pedestal, wherein the LEDs are high-power LEDs mounted on the back of the LCD, Each LED includes a light emitting point, a light-transmitting cover body is packaged outside the light emitting point, and a conical prism is installed on the light emitting path of the light emitting point. A heat conductive substrate is installed around the LED, and the heat dissipation pedestal is mounted behind the LED. A reflective surface is provided around the LED of the heat dissipation pedestal.
[Selection] Figure 3

Description

  The present invention relates to a conical prism type LCD backlight illumination device, and more particularly to an LCD backlight illumination device that can be easily assembled, manufactured, and maintained, and can exhibit uniform and saturated luminance and color.

At present, the LCD backlight illumination device mainly uses white light CCFL (cold cathode tube). The CCFL is installed behind the LCD to emit light and project onto the light guide plate, diffusion plate, and light-intensifying sheet, and then projected onto the LCD. The screen on the LCD appears to light up.
As the size of LCDs grows larger, so does the demand for CCFLs and drive circuits.
In order to achieve a large size LCD backlight illumination function, multiple CCFLs must be in series and parallel.

However, due to innate elements, CCFL has the following drawbacks.
(1) The brightness of the CCFL is uneven, and even if the CCFLs are connected in series and in parallel, the brightness obtained is still not uniform within the LCD size range. This point is particularly noticeable in large-size LCDs.
(2) The life of the CCFL is short, and when it is used for about 4000 to 6000 hours, the brightness begins to attenuate, and it is not easy to replace, and the service life of the LCD is greatly shortened.
(3) The color saturation of CCFL is insufficient and its color temperature is about 4800K. Therefore, only 80% of the color gamut specified by NTSC can be achieved.
In particular, the red color is poorly expressed and cannot meet the high-standard 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) CCFL has a relatively large power consumption and contains “mercury” which is a harmful substance at the time of manufacture, which is obviously harmful to environmental protection.
For this reason, the Kyoto Protocol states that it will be banned from July 1, 2006.
Therefore, the use of other backlight light sources is an inevitable trend for LCD development.

Currently, the technology that is universally adopted in the industry is that LED is used as a backlight light source, and application of LED to a small-size LCD screen has already been performed for a certain period of time.
In recent years, for example, cellular phones and PDAs, the technology has been further improved, and the brightness of LEDs has been greatly improved. In addition, it is light and solid, has a relatively long life, and has a quick startup response. It is a selection target.

  In general, the LED is used as an LCD backlight light source. The LED light source is projected onto the LCD when an LED with an unequal quantity is mounted on one or both sides of the LCD and the power is turned on. Appear.

  General LED rays do not scatter uniformly, concentrate within a small area, and become particularly bright in areas with LED projection rays on the LCD. Is not evenly expressed.

  Further, the above-mentioned LCD device cannot be replaced individually when some of the elements of the backlight device are damaged, and the entire device must be replaced, which increases the 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 points, the present inventor has realized that the brightness and color of the entire LED can be expressed uniformly by refracting the light emitted from the LED by 90 degrees using a conical prism. .
Furthermore, the conical prism-type LCD according to this proposal is finally obtained through research and development and experiments, such as solving problems such as heat generation failure and brightness attenuation of high-power LEDs through a special heat dissipation mechanism, and facilitating maintenance through independent module design. We have succeeded in research and development of backlight illumination devices.

  The main purpose of the present invention is to use a high power LED as a light source, project a light beam onto a conical prism, refract it around the reflector at an appropriate angle, and further reflect it onto the light guide plate to make the light beam uniform. It is an object of the present invention to provide a conical prism type LCD backlight illumination device in which the LCD can exhibit high brightness and high saturation color by being reflected on the LCD.

  Another object of the present invention is to reduce the failure rate caused by heat by providing a special heat dissipating mechanism and mass production of single-standard backlight lighting modules, and the production pass rate of large size LCD Another object of the present invention is to provide a conical prism type LCD backlight illumination device capable of improving luminance.

  Another object of the present invention is to construct the LED as a small module, so that when a single element is damaged, the damaged part of the module is directly replaced to facilitate maintenance of a large-size LCD. An object of the present invention is to provide a conical prism type LCD backlight illuminating device.

A conical prism-type LCD backlight illumination device that can achieve the above-described object includes an LCD, a plurality of LEDs, and a heat dissipation pedestal.
The LED is a high-power LED, and is mounted behind the LCD to generate a sufficient ray of light and project it onto the LCD. Each LED includes a light emitting point and is outside the light emitting point. Is packaged with a translucent cover. A conical prism is installed on the light emission path of the LED.
A heat conducting substrate is installed around the LED, the heat dissipating pedestal is mounted behind the LED, and a reflective surface forming an inclined surface is installed around the LED of the heat dissipating pedestal.
When a light beam is generated from the light emitting point, the light beam is projected onto the conical prism, refracted at an appropriate angle via the conical prism, and further projected onto the light guide plate and the diffusion plate by the reflecting surface. Thus, the light beam can be uniformly distributed on the LCD.
The thermal energy generated by the high power LED is guided to the heat dissipation pedestal by the heat conductive substrate, and the stability of the product can be ensured.

  The present invention expresses high brightness and high saturation color in the LCD, reduces the manufacturing cost, further improves the production pass rate of the large size LCD, and facilitates the maintenance, particularly in the large size LCD. It is suitable for use.

  Hereinafter, a conical prism type LCD backlight illumination device according to the present invention will be described with reference to the drawings.

A description will be given with reference to FIGS.
The conical prism type LCD backlight illumination device according to the present invention is formed by an LCD 1, a plurality of LEDs 2, and a heat dissipation pedestal 3.
The LCD 1 is for representing a screen, and a diffusion plate 11 and a light guide plate 12 are installed behind the LCD 1.

This is because the diffusion plate 11 receives the light from the light source and distributes it uniformly so as to avoid the light rays from being concentrated at one point.
The light guide plate 12 can further match the brightness and color saturation of the screen of the LCD 1 by further advancing the light beam one step and uniformly distributing it.
The LED 2 is mounted behind the LCD 1 so as to generate a light beam and project it onto the LCD 1. The LED 2 is a high power LED and can generate a sufficient light beam.

Each of the LEDs 2 includes a light emitting point 21.
A light-transmitting cover 22 is packaged outside the light emitting point 21, and a conical prism 23 is installed in the light emitting path of the LED 2. When a light beam is generated from the light emitting point 21, the light beam is transmitted to the conical prism. Then, the light beam is refracted at an appropriate angle by the conical prism 23.

Further, it can be projected onto the LCD 1 by reflecting surfaces 31 and 32 described later.
Around the LED 2, a heat conductive substrate 24 as a super heat conductive substrate by a nanometer process is provided, and the heat energy generated from the high power LED 2 is guided onto a heat dissipation pedestal 3 to be described later, thereby ensuring the stability of the product. I can do it.

The heat dissipating pedestal 3 is mounted behind the LED 2 to attach the LED 2 and related electric circuit units (not shown). In the heat dissipating pedestal 3, reflective surfaces 31 and 32 are installed around the LED 2. To do.
The reflecting surfaces 31 and 32 are inclined so that the light rays coming from the conical prism 23 can be received and refracted and projected onto the LCD 1.

  Since each LED 2 has a modular design, according to the present invention, it is quite convenient in terms of manufacturing and maintenance, the failed LED 2 can be replaced independently, and the entire backlight illumination device is replaced. There is no need.

Due to the above structure, in the operation of the present invention, light is first emitted from the light emitting point 21, and this light beam is projected onto the conical prism 23 via the light emission path, and is refracted at an appropriate angle by the conical prism 23. I do.
Thereafter, the light is projected onto the reflection surfaces 31 and 32.
The reflection surfaces 31 and 32 further refract the light and project it onto the LCD 1.

Since the light beam is refracted many times, it is possible to avoid the disadvantage that the light beam is uniformly dispersed on the LCD 1 and the light beam is directly concentrated on one point on the LCD 1 and the brightness is not uniform.
In addition, the product life can be extended.

  Further, in the present invention, the high power LED 2 is adopted, but its thermal energy is conducted on the heat dissipation pedestal 3 via the heat conducting substrate 24, and in addition to the area distribution of the heat dissipation pedestal 3 itself, copper / aluminum・ High heat dissipating and low cost materials such as iron can disperse heat energy appropriately and improve product durability.

  The height of the reflective surface 31 inside the LCD 1 is slightly lower than the reflective surface 32 around the LCD. The purpose is to allow the light from each LED 2 to extend to the area of the surrounding LED 2 so that the light rays can be further diffused and overlap the light from the surrounding LED 2 to make the light rays on the LCD 1 more uniform.

Moreover, the modular design of the present invention makes it easier to produce products.
In the present invention, the LED 2 is easily mounted by providing the positioning point 33 on the heat dissipation pedestal 3.
Specifically, a notch 25 is provided on the heat conductive substrate 24, and the LED 2 and the heat conductive substrate 24 are positioned on the heat dissipation pedestal 3 quickly by the notch 25 so that they can be produced quickly.

  The above detailed description is a specific description of an embodiment in which the present invention can be implemented. However, the description of the embodiment does not limit the scope of the claims of the present invention, and departs from the technical spirit of the present invention. All equivalent implementations or modifications made without this are intended to be included in the present invention.

1 is a perspective view of a conical prism type LCD backlight illumination device according to the present invention. It is sectional drawing of the said conical prism type | mold LCD backlight illumination apparatus. It is an operation principle diagram of the conical prism type LCD backlight illumination device.

Explanation of symbols

1. LCD
11 ... Diffusion plate 12 ... Light guide plate 2 ... LED
21... Light emitting point 22... Translucent cover body 23... Conical prism 24. Heat dissipation pedestal 31 ... reflective surface 32 ... reflective surface 33 ... positioning point

Claims (3)

Including an LCD, a plurality of high power LEDs having a light emitting point, and a heat dissipation pedestal,
The plurality of LEDs are mounted behind the LCD, a light-transmitting cover body is packaged outside the light emitting point, a conical prism is installed on the light emitting path of the LED, and the LED base is surrounded. Has a heat conducting board installed,
The heat dissipating pedestal is mounted behind the LED and is used for mounting the LED and related electric circuit unit. A reflecting surface is provided around the LED of the heat dissipating pedestal. None,
The light beam emitted from the LED light emitting point is refracted according to the angle of the conical prism, projected onto the surrounding reflection surface, and further refracted from the reflection surface to the light guide plate and the diffusing plate, so that the light beam is uniformly projected on the LCD. Characterized by appearing,
Conical prism type LCD backlight illumination device. The conical prism according to claim 1, wherein the light of each LED is further diffused by making the height of the reflective surface inside the LCD slightly lower than the reflective surface around the LCD. LCD backlight illumination device. The diffusing plate and the light guide plate are installed on the back side of the LCD, and the projection light of the LED is further uniformly projected onto the LCD through the light guide plate and the diffusing plate. Item 4. The conical prism type LCD backlight illumination device according to Item 1.

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