CN2924582Y - The structure of direct type backlight module using light emitting diode as light source - Google Patents

Abstract

The invention relates to a structure of a direct-lit backlight module using a light emitting diode as a light source. A shielding layer is arranged above an emission surface of the light emitting diode so that the front light emitting light of the light source of the light emitting diode generates light diffraction due to the shielding layer, and the point light source of the light emitting diode becomes a surface light source, so as to reduce the number of light emitting diodes used in the backlight module.

Description

The structure of direct type backlight module using light emitting diode as light source

Technical field:

The utility model relates to a backlight module, in particular to a structure using a light-emitting secondary body chip in the backlight module.

Background technique:

The reason why the eyes can see the colorful world is because the light source is working. Similarly, notebook computers use LCDs to display colors, whether using super-twisted nematics (STN) or thin-film transistors (TFT), they all need white light backlighting for illumination. Because the white light spectrum contains all colors, and the color filter of the display will select the required color from the white light spectrum, and finally form the colorful and realistic picture that our eyes see.

At present, there are mainly electroluminescence (EL) and cold cathode fluorescent tubes (CCFT) that can produce white light spectrum, and white LED, as a rising star, is considered to be the most valuable new light source in the 21st century. In our daily mobile phones, LEDs are commonly used as light sources. Most of the LCD screens of ordinary notebook computers use CCFT as the backlight source. The brightness of CCFT is very high, but the disadvantage is that it needs to be driven by high-voltage alternating current, and it also contains mercury that is harmful to the environment and health, and the requirements for the power transformer and rectifier group are relatively complicated. Difficult manufacture of area backlights, high cost of optical film, and other bottlenecks. Although CCFL has the characteristics of linear light emission and uniform light source, its disadvantages are high power consumption and environmental protection. In comparison, LEDs are single-point Luminous, low power consumption, plus long life, short and light, and environmental protection, etc., LED has gradually replaced CCFL in a large number of products such as mobile phones, PDAs, digital cameras, car panels, and handheld DVD players. In the future, it will gradually move towards LCD monitors, NB, LCD TVs and other fields.

Energy saving is the most significant advantage of LED technology, which can save 60%-80% of electric energy than ordinary incandescent lamps, and 50% less than fluorescent lamps. It uses low-voltage power supply, so it is safer and more reliable.

On the 7.2-inch LCD screen, Toshiba U100 uses an independent control mechanism of 32 LEDs to realize the backlight system, which can display images and characters vividly and clearly, but the power is only 1.3W, and can be adjusted at will. The CCFT (Cold Cathode Fluorescent Tube) cold cathode fluorescent tube required by the LCD screen of the same size consumes more than 2.5W of power. The reduction in power consumption also directly extends the battery life of the U100, making movement more convenient and free.

Secondly, environmental protection is one of the unique charms of LED technology. Because LEDs do not use mercury, which is harmful to the environment, and CCFT contains mercury. As we all know, mercury pollution has become a global environmental problem. The European Commission issued a notice proposing a long-term plan for comprehensive control of mercury pollution, including banning the export of mercury products. The plan states that mercury and its compounds can be fatal to human health; ingestion of even low doses of mercury can cause damage to the human nervous system. Even if mercury flows from the land into the ocean, it will gradually be deposited on the fish. When people eat fish with excessive mercury content, it can also cause permanent damage to health.

Therefore, in the future, LEDs will be widely used in backlight modules due to their advantages of power saving and environmental protection. Surface light source, so the number of LEDs is relatively large in application. The utility model provides a structure of a backlight module to reduce the number of LEDs used.

Utility model content:

The main purpose of the present utility model is to provide a direct type backlight module structure using light-emitting diodes as light sources, which uses at least one light-emitting diode chip as its light source (Light Source) to save power.

The secondary purpose of the present utility model is to provide a direct-lit backlight module structure using light-emitting diodes as light sources. The light emitted from the front of the light source of the pole body is diffracted by the shielding layer, so that the point light source of the light-emitting diode becomes a surface light source, so as to reduce the number of light-emitting diodes used in the backlight module.

The beneficial effect of the utility model is that the power supply can be saved; the number of light-emitting diodes used in the backlight module can be reduced by setting a shielding layer.

Description of drawings:

Fig. 1: It is a structural schematic diagram of a preferred embodiment of the present utility model.

Description of figure number:

1 backlight module 10 light-emitting diodes 12 shielding layer

20 light diffusion plate 30 reflector

Detailed ways:

In order to enable the examiner to have a further understanding and understanding of the structural features and the achieved effects of the utility model, a preferred embodiment and a detailed description are provided, as follows:

The utility model uses light-emitting diodes to light up very quickly, unlike cold-cathode tubes that need a period of warm-up time when starting up, and has no environmental protection problems. It is used in backlight modules, and then through a novel The light-emitting diode structure makes it a surface light source, so as to reduce the number of light-emitting diodes used, so as to save cost and power supply.

The utility model can be used for the following surface mount type (SMD) light emitting diodes, bulb type (Lamp) light emitting diodes and printed circuit board (PCB) light emitting diodes, the utility model is not limited to the aforementioned The light-emitting diode of the packaging structure is applicable to various types of light-emitting diodes of the packaging structure. The following is an example of a surface-mounted (SMD) light-emitting diode for illustration.

Please refer to Figure 1, which is a schematic structural diagram of a preferred embodiment of the present invention; as shown in the figure, the present invention provides a structure of a direct-type backlight module using a light-emitting diode as a light source, the backlight module The main structure of group 1 includes a light-emitting diode 10 and a light-diffusing plate 20, wherein a shielding layer 12 is arranged above an outgoing surface of the light-emitting diode 10, and the light-emitting diode is made to pass through the shielding layer 12. The light rays of 10 are shielded and produce light diffraction on the side, causing every point on the side of the light-emitting diode 10 to be a light source. Due to the generation of light diffraction, the point light source of the light-emitting diode in the prior art becomes surface light source.

Furthermore, the backlight module of the present utility model may further include a reflector to increase the utilization rate of light. Since the shielding layer 12 is located on the outgoing surface of the main light of the diode, the material of the shielding layer 12 must be Use materials with low light absorption rate, so that light energy will not be lost, that is, materials that can produce total reflection. The utility model uses conductive materials, such as: gold, silver, copper, aluminum or its alloys or any of the above-mentioned Combined compound.

In addition, the length of the shielding layer 12 of the present invention can be equal to or greater than or less than the length of the emitting surface of the light emitting diode, so as to provide a more uniform light source.

The above are only preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model. All changes and modifications in accordance with the shape, structure, features and principles described in the claims of the present utility model , should be included in the scope of the claims of the present utility model.

Claims (8)

1. A structure of a direct-type backlight module utilizing a light-emitting diode as a light source, characterized in that its main structure comprises: at least one light-emitting diode, and a shielding layer is arranged above the light-emitting surface of the light-emitting diode; A light diffusion plate is arranged above the light emitting diode chip. 2. The structure of claim 1, wherein the length of the shielding layer is greater than that of the light emitting surface. 3. The structure of claim 1, wherein the shielding layer has a length equal to the light emitting surface. 4. The structure as claimed in claim 1, wherein the shielding layer has a length shorter than the light emitting surface. 5. The structure according to claim 1, wherein the light emitting diode can be packaged in a light bulb type, a printed circuit board type, a front-emitting type, a side-emitting type, or a surface-mounted type. 6. The structure of claim 1, wherein the shielding layer is a conductive material. 7. The structure of claim 6, wherein the conductive material is selected from gold, silver, copper, aluminum or alloys thereof or composites of any combination thereof. 8. The structure of claim 1, wherein a reflective sheet is further disposed under the light-emitting diode chip.