The invention mainly provides a laser processing method and device for an optical plate with simplified process and high yield. The laser processing method and device are used for processing a module, wherein the laser processing unit receives a graphic file of a processing pattern, sets orientation parameters according to the graphic file, manually inputs processing parameters, including a predetermined depth and laser energy parameters, so that the module forms a plurality of corresponding points, and then copies the module to form an optical plate.
Patent description tin shooting processing method and its straightening technical field
[000 1] The invention relates to a laser processing method and a device thereof, in particular to a laser processing method and a device for manufacturing optical plates with simplified process and mass production.
technical background
[0002] Since the liquid crystal of the LCD panel itself does not have luminous characteristics, it is necessary to provide the LCD panel with a surface light source device, such as a backlight system, in order to achieve the display effect, and its function is to provide the LCD panel with sufficient brightness and uniformly distributed surface light sources.
[0003] The backlight system in the prior art mainly consists of a light source, a light guide plate, a reflection plate, a diffusion plate and a prism plate. The light source can be arrange on one side or two opposite sides of that light guide plate and emit light to the light guide plate. The function of the light guide plate is to guide the propagation direction of light, so that the light can be uniformly emitted from the light-emitting surface of the light guide plate, and the reflection plate is arranged opposite to the bottom surface of the light guide plate, so that the light emitted from the bottom surface of the light guide plate can be reflected into the light guide plate again, and the utilization rate of light is improved. The diffusion plate and the prism plate are sequentially arranged relative to the light-emitting surface of the light guide plate, so that the light emitted by the light guide plate is more evenly distributed, and the brightness and uniformity of the liquid crystal panel are further improved; Therefore, the design and manufacture of light guide plate is related to the optical design and brightness uniformity control of backlight module, which is the most important technology and cost for backlight module manufacturers.
[0004] Generally speaking, the manufacturing method of the traditional light guide plate is as follows.
[0005] 1. Screen printing method, using "high reflectivity" and "non-light absorption" materials on the acrylic flat plate, printing circular or square patterns on the bottom of the light guide plate.
[0006]2. A light guide plate with a pattern, which is formed by direct injection molding with a mold, wherein the pattern can be formed on the light emergent surface or the light incident surface of the light guide plate. First, a thin metal sheet with a light guide plate pattern is attached to the female die (or mirror mold core) of the injection molding mold, and then the mold is closed, so that the male mold and the female die are closely combined. At this time, the raw material (usually propylene, commonly known as acrylic) is injected into the cavity from the injection port of the punch in the direction of the arrow, and the pattern of the light guide plate can be formed on the sheet by using processing techniques such as cutter, lathe, wire cutting, etching and sandblasting. Cooperate with copiers such as injection molding machines and hot presses.
[0007] However, in the manufacturing process of the light guide plate in the prior art, because the mold for manufacturing the light guide plate adopts sand blasting or tool engraving processing to form patterns, if the tool engraving processing process is adopted, there will be disadvantages such as large tool cost loss, long manufacturing time, poor accuracy, lack of diversity of light guide plate patterns, etc. Furthermore, the repeatability of sandblasting and etching is not good, which can not effectively improve the repeatability of mold making, and often leads to the deviation of light distribution during mold making.
[0008] In addition, regarding the control of the pattern density distribution of the light guide plate, if we want to adjust the pattern density distribution of the light guide plate by using sandblasting surfaces with different roughness distributions, and then adjust the luminous uniformity of the backlight module, it is a pity that the current sandblasting processing technology cannot accurately control the processing point density of different areas of the light guide plate. However, if only the sandblasting fog surface with the same roughness can be made, the light uniformity of backlight module will not be easily adjusted, which is the bottleneck faced by the manufacturing of light guide plate at present.