Patent Application
20050099587
1. Field of the Invention
The present invention relates to a method of repairing defective spots on a liquid crystal display panel. More particularly, the present invention relates to a method of using micro-lens technique to repair white spots in a liquid crystal display panel.
2. Description of the Related Art
In recent years, there are a number of breakthroughs in the manufacturing of display devices such as computer monitors and televisions. In compared with a cathode ray tube (CRT), a liquid crystal display (LCD) has gradually become one of the mainstream display products in the market since the advantages of low operating voltage, low power consumption, no radiation, light weight, thin thickness and compact package.
However, due to a variety of technological limitations, the screen size of a liquid crystal display devices is limited to be below 30 inches. For a larger size display panel such as a screen size between 30 to 60 inches, the plasma display panel (PDP) is a potential candidate. However, the high cost of the production the plasma panel display renders other types of display devices such as a projection display device to be more economical and feasible. A variety of reflective projection display devices, for example, such as liquid crystal display (LCD), digital light projector (DLP) and liquid crystal on silicon (LCOS), has been developed in order to reduce the cost of production of a large size display. Although the LCD and DLP devices are still the dominant devices of the displays in the mean while, the liquid crystal on silicon (LCOS) has great potential for future development. In general, the LCOS display has a low cost of production, a high opening rate (up to 90%) and a high resolution (a pixel pitch down to 12 μm). With these advantages, a lot of display device manufacturers are actively engaged in the development of related technologies to prevail in the micro-display market.
As to both of the liquid crystal display (LCD) device and the liquid crystal on silicon (LCOS) display device, a liquid crystal display panel is required. In the manufacturing process of a liquid crystal display panel, a major factor affecting the yield of the display quality is the generation of defect spots. The so-called defect spots are the constant bright or constant dark spots on a liquid crystal display panel that can not be control and can no longer be repaired. The defect spots are typically generated in the manufacturing process of the liquid crystal display panel by various factors such as one or more particles failed on the panel, a damage caused by the electrostatic charge or the improper control of the process parameters. In general, the defect spots can be classified into white spots or dark spots. The white spots are any pixel points that show up bright no matter which type of pictures is displayed by the display screen. The white spots are revealed when the display of frame is switched to a black frame. On the other hand, the dark spots are pixel points that show up dark no matter which type of pictures is displayed by the display screen. The dark spots are revealed when the display of frame is switched to a white frame. Because the white spots are more abhorrent to user than the dark spots, the prevention of generation of the white spots during the manufacturing process is required.
Accordingly, at least one object of the present invention is to provide a method of converting the white spots on a manufactured liquid crystal display into dark spots.
To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention provides a method for repairing white spots on a liquid crystal display panel and a white spot free liquid crystal display panel device. To repair the white spot on a liquid crystal display panel, a repairing spot is formed over the white spot. The repairing spot has important interference properties for absorbing, diverting or scattering the light from the white spot. Alternatively, the repairing spot may have important properties for changing the optical path and the polarity or the polarity distribution of the light from the white spot so that the light from the white spot can be blocked by an analyzer a or a polarizer to convert the white spot into a dark spot.
In one embodiment of this invention, a method for repairing the white spots on a liquid crystal display panel is provided. The method includes detecting the presence of any white spots on a liquid crystal display panel. When a white spot is detected, a repairing spot is coated on the surface of the liquid crystal display panel above the white spot to convert the white spot into a dark spot.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, a material of the repairing spots for repairing white spots on a liquid crystal display panel includes an organic material.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of absorbing, diverging or scattering the light traveling through the white spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the optical path of the light traveling from the white spot through a repairing spot. After changing the optical path of the incoming light, an analyzer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the polarity or the polarity distribution of the light traveling from the white spot through a repairing spot. After changing the polarity or the polarity distribution of the light, a polarizer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of absorbing, diverging or scattering the light reflected from the white spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the optical path of the light reflected from the white spot through a repairing spot. After changing the optical path of the reflected light, an analyzer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the method of repairing white spots on a liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the polarity or the polarity distribution of the light reflected from the white spot through a repairing spot. After changing the polarity or the polarity distribution of the light, a polarizer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
This invention also provides a white spot free liquid crystal display panel. The method of removing the white spots on a liquid crystal display panel includes coating a repairing spot on the liquid crystal display panel above each white spot.
In the white spot free liquid crystal display panel according to one embodiment of this invention, a material of the repairing spots for repairing white spots on a liquid crystal display panel includes an organic material.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of absorbing, diverging or scattering the light traveling through the white spot through a repairing spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the optical path of the light traveling from the white spot through a repairing spot. After changing the optical path of the incoming light, an analyzer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the polarity or the polarity distribution of the light traveling through the white spot through a repairing spot. After changing the polarity or the polarity distribution of light, a polarizer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot has a micro-lens structure.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of absorbing, diverging or scattering the light reflected from the white spot through a repairing spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes a method of changing the optical path of the light reflected from the white spot through a repairing spot. After changing the optical path of the reflected light, an analyzer can convert the white spot into a dark spot. In this embodiment, the repairing spot has a micro-lens structure.
In the white spot free liquid crystal display panel according to one embodiment of this invention, the method of converting a white spot into a dark spot includes changing the polarity or the polarity distribution of the light reflected from the white spot through a repairing spot. After changing the polarity or the polarity distribution of light, a polarizer can convert the white spot into a dark spot. In a preferred embodiment, a structure of the repairing spot includes a micro-lens structure.
Accordingly, this invention provides a method of repairing white spots on a liquid crystal display (LCD) panel and a white spot free LCD panel using thereof. The method includes the steps of detecting any irreparable white spots on the liquid crystal display panel and then coating a repairing spot on the surface of the liquid crystal display panel above each white spot so that the white spots are converted into dark spots.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.
Accordingly, the invention provides a method of repairing the white spots on a liquid crystal display panel. After an irreparable white spot on the liquid crystal display panel is detected, a repairing spot 250 is formed on the panel above the white spot 242. The repairing spot 250 is manufactured from an organic material having the properties that can interfere with the light 130 traveling through the white spot. In one embodiment, for example, the light 130 traveling to the white spot 242 can be absorbed by the repairing spot 250. In another embodiment, the light 130 traveling to the white spot 242 can be refracted. In yet another embodiment, the light 130 traveling to the white spot 242 can be scattered to various directions. Furthermore, to increase the scattering efficiency and the uniformity of scattering of the light 130, the structure of the repairing spot 250 includes a micro-lens structure.
Therefore, the invention provides a method of repairing white spots on a liquid crystal on silicon (LCOS) display panel. After an irreparable white spot 432 on the LCOS display panel is detected, a repairing spot 440 is formed on the cover glass 306 of the LCOS display panel 300 above the white spot 432. The repairing spot 440 is manufactured from an organic material having the properties that can absorb, refract or scatter the light 320, or can change the polarity or the polarity distribution of the light 320. Furthermore, to increase the scattering efficiency and the uniformity of scattering of the light 320, the structure of the repairing spot 440 includes a micro-lens structure.
Accordingly, the invention provides a method of repairing the white spots on a liquid crystal display panel and a white spot free LCD panel using thereof. A repairing spot is formed on the surface of the liquid crystal display panel above each white spot. Furthermore, the structure of the repairing spot can includes a micro-lens structure. The repairing spot can absorb, diverge or scatter the light from the white spot. Alternatively, the repairing spot can also change the optical path or the polarity or the polarity distribution of the light from the white spot so that a polarizer or an analyzer can block the light. Hence, the white spot is converted into a dark spot.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
