How is the light guide plate made?

The light guide plate is an optical acrylic /PC board, and then the light guide spot is printed on the bottom of the optical acrylic board by using high-tech materials with high reflectivity and no light absorption through UV screen printing technology. By using the optical acrylic plate, the light emitted from the lamp stays on the surface of the optical acrylic plate. When the light hits each light guide spot, the reflected light will spread to all angles, and then it will break the reflection condition and exit from the front of the light guide plate. The light guide plate can emit light uniformly through light guide spots with different densities and sizes. The function of the reflector is to reflect the light exposed at the bottom back to the light guide plate to improve the utilization efficiency of light; Under the condition of the same area luminous brightness, the luminous efficiency is high and the power consumption is low. The fabrication process of single-sided microstructure array light guide plate is generally extrusion molding.

Manufacturing process:

Since 1990s, with the continuous development of science and technology, the manufacturing method of light guide plate has been gradually improved, which is different from the early printing manufacturing. Relatively speaking, we call it "non-printing".

Jet molding method

It fills the molten molding material into the closed mold by high pressure, which requires the light guide plate and microstructure to be completed simultaneously in injection molding, and the mold must be made quite firm, so the mold price is also quite expensive, and it must be mass-produced to offset the high mold cost. Single-sided micro-structure array light guide plate is generally formed by injection molding, and its bottom texture structure can be microlens shape, microsphere shape or quadrangular pyramid prism shape.

photoetching

Lithography technology is to coat a layer of corrosion-resistant photoresist on a flat silicon wafer, and then let strong light pass through the lithography plate, where it is selectively exposed according to the graphic information of a specific layer; Then the developed photoresist is removed, leaving a thin film with micro-pattern structure on the upper surface of the silicon wafer. The surface roughness of the light guide plate made by photolithography is not good, and the light energy loss is relatively large.

mix

In the process of injection molding of light guide plate, transparent particle material with scattering function is directly injected into the light guide plate, and the light emission is effectively controlled by reasonably adjusting the concentration of transparent particles, and finally the high uniformity of light emission is realized. Because the doping process is not easy to control accurately, injection molding is suitable for making small and medium-sized light guide plates, and uneven light will appear for large-sized light guide plates.

Laser engraving

The manufacturing method of laser engraving is that according to the program requirements, the computer strictly controls the energy and position of the laser head, and engraves a micro-structure array with a certain size on the back of the light guide plate through gasification. This method can accurately control the depth of scattering structure, but its efficiency is very low and it is not convenient for mass production.

sand blast

The mold with rough distribution surface is made by sandblasting, and the rough distribution on the mold is transferred to the light guide plate during injection molding. The more rough surfaces there are, the stronger the scattering ability is. By adjusting the rough distribution of the surface reasonably, the light distribution on the smooth surface will be uniform.

Single point diamond machining

Single-point diamond machining is also called nano-machining technology, and its machining accuracy can reach nano-scale surface roughness. It fixes the workpiece on a precision lathe and uses a natural single crystal diamond tool for fixed-point turning. Firstly, the mold core of the light guide plate is fixed on the rotating shaft to rotate, and then it is made by using the rapid piezoelectric feed of the diamond sharp knife. The concave-convex lens of the light guide plate is machined by fast feed system and ultra-precision single-point diamond equipment.

Application:

Ultra-thin light box, the light guide plate, is a new type of advertising carrier (called "ultra-thin light box" in the industry, but personally, it is not a light box. It is more appropriate to call it "luminous advertising billboard". Its characteristics are as follows:

1, beautiful appearance, its thickness is generally less than 3 cm, which maximizes the use of space, beautifies the environment and broadens the application scope.

2. Bright light is completely output in the plane, almost perfect and uniform, completely eliminating the common light and shade traces of ordinary light boxes. Its excellent optical characteristics are not only widely used in public places, but also expand its application in high-tech fields such as precision display, photography and medical viewing, scientific research, high-standard lighting, and the effect is comparable to that of LCD.

3. Another commendable advantage is energy saving. Due to the advanced light guide plate lighting technology, the power consumption is only 23% of that of ordinary light boxes with the same screen area. Based on the daily electricity consumption of light boxes with screen area of 1㎡ 10 hour, the annual electricity consumption of ordinary light boxes is nearly 900 kWh, while that of ultra-thin light box is only 200 kWh, saving 77% electricity, and the investment can be recovered only by the electricity saved in that year.

4. The average service life of special high-brightness high-quality fluorescent tubes used in ultra-thin light box is over 8,000 hours; The average life of special cold cathode lamp is more than 654.38+500,000 hours. The service life of lamps used in ultra-thin light box is 5 to 10 hour longer than that of ordinary lamps. The extension of service life greatly saves the maintenance cost.

5. ultra-thin light box widely adopts imported high-quality aluminum alloy open integral frame structure, which is equipped with movable hooks or hanging holes, making the installation and drawing change of light boxes simple and quick, saving labor, time and money.