Abstract:
A package structure for packaging a liquid crystal display (LCD) panel. The package structure includes a heat sink for positioning the LCD panel, a transparent cover against the LCD panel, and a sealing material for sealing the LCD panel within the package structure.

Description:
BACKGROUND OF INVENTION 
   1. Field of the Invention 
   The present invention relates to a package structure for packaging an LCD panel. The package comprises a heat sink for positioning the LCD panel, a transparent cover above the LCD panel, and an adhesive for adhering the transparent cover to the heat sink in order to seal the liquid crystal panel between the transparent cover and the heat sink. 
   2. Description of the Prior Art 
   A new Liquid Crystal on Silicon (LCOS) display is an advanced product combining two kinds of VLSI (Very Large Semiconductor Integrated) and LCD display technologies. The LCOS display differs from a thin film transistor liquid crystal display (which has two glass sheets on two sides as substrates) by utilizing two substrates, one being a glass sheet on the upper side and the other being made of a semiconductor material such as silicon on the bottom side. As a result, the LCOS display can be mass produced by utilizing regular Complementary Metal Oxide Semiconductor (CMOS) procedures, thereby minimizing its area as well as raising its resolution due to the advancing development of semiconductor technology. The LCOS panels, due to their lightweight, low power consumption, and no radiation, have increasingly replaced traditional CRT monitors and are also used in portable electrical devices such as notebook computers and personal digital assistants. 
   Please refer to  FIG. 1 , which shows a conventional LCOS package. The LCOS module  10  comprises an LCOS panel  12  and a flexible printed circuit board  16  electrically coupled to the LCOS panel  12  for transferring image signals to the LCOS panel  12  in order to display an image. The conventional LCOS module  10  has no package structure; instead it directly contacts with an outside environment, so that the LCOS panel  12  and the flexible printed circuit board  16  tend to get stained by dust and vapor, negatively affecting their performance. 
   Please refer to  FIG. 2 , which shows a schematic diagram of a conventional display apparatus  20 . The display apparatus  20  comprises a light source  22 , a liquid crystal panel  24 , a Polarization Beam Splitter (PBS)  26 , a lens  28 , and a screen  29 . The liquid crystal panel  24  can be an LCOS panel. After the light source  22  irradiates light, the light will pass through the PBS  26  and the liquid crystal panel  24 . The liquid crystal panel  24  modulates the light and generates heat. The modulated light will be reflected back to the PBS  26 , pass through the lens  28  and finally arrive at the screen  29 . An image is thereby projected onto the screen  29 . Because the heat generated by the liquid crystal panel  24  will damage the quality of the image, how to dissipate the heat is an issue for the developer. In addition, the LCOS display&#39;s exposure to air tends to stain the display panel. Therefore, an improvement of the conventional LCOS display package is required. 
   SUMMARY OF INVENTION 
   It is therefore a primary objective of the present invention to provide a package structure for packaging an LCOS panel to solve the above-mentioned problem. 
   Another objective of the present invention is to provide an LCD display module having an LCD panel positioned on a heat sink. 
   According to the claimed invention, a package structure for packaging a liquid crystal panel comprises a heat sink for dissipating heat generated by the liquid crystal panel positioned on the heat sink, and a transparent cover located above the liquid crystal panel. The package structure employs an adhesive to adhere the transparent cover to the heat sink, sealing the liquid crystal panel between the transparent cover and the heat sink. The package structure further comprises a circuit carrier electrically coupled to the liquid crystal panel to transfer an image signal. 
   The transparent cover is made of glass, and the heat sink is made of metal. The transparent cover and the heat sink are sealed with a first adhesive and a second adhesive. The first adhesive is a kind of UV glue and the second adhesive is a kind of waterproof glue 
   According to the claimed invention, a display apparatus comprises a Liquid Crystal on Silicon panel (LCOS panel) having a color filter, and a heat sink for dissipating heat generated by the liquid crystal panel positioned on the heat sink. The color filter comprises one or more colors selected from a group consisting of red, green, and blue. The display apparatus further comprises a transparent cover located above the Liquid Crystal on Silicon panel. The display apparatus employs an adhesive for sealing the liquid crystal panel between the transparent cover and the heat sink. 
   These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
       FIG. 1  is a diagram of a conventional LCOS package. 
       FIG. 2  is a schematic diagram of a conventional display apparatus. 
       FIG. 3  is a diagram of an LCOS package structure according to the present invention. 
       FIG. 4  is a diagram of the assembled LCOS package. 
       FIG. 5  is a cross-sectional view along the  5   5 ′ line depicted in  FIG. 4 . 
       FIG. 6  is a cross-sectional view of another embodiment according to the present invention. 
       FIG. 7  is a cross-sectional view of a seam of the LCOS package structure. 
   

   DETAILED DESCRIPTION 
   Please refer to  FIG. 3  and  FIG. 4 .  FIG. 3  shows an LCOS package structure according to the present invention.  FIG. 4  is a diagram of the assembled LCOS package. The LCD display module  30  comprises a transparent cover  32  with a mask  33 , an LCD panel  34 , a circuit carrier  36  and a heat sink  38 . The transparent cover  32  is used for protecting the LCD panel  34  from dust and scraping. The mask  33  is used for blocking unnecessary light progressing into the LCD display module  30  and avoiding influencing the optical quality. The LCD panel  34 , coupled to the circuit carrier  36 , is used for displaying an image based on the image signals transferred via the circuit carrier  36 . The heat sink  38 , affixed to the LCD panel  34 , is used for dissipating heat generated by the LCD display panel  30  as strong light irradiates the display panel. Because the extra heat will degrade the optical quality of the LCD display module  30 , an assembly of the heat sink  38  and the LCD panel  34  will improve such a problem. Moreover, the heat sink  38  comprises an opening for allowing the circuit carrier  36  to pass through. 
   The transparent cover  32  is made of glass. The mask  33  is a light shielding film stamped on peripheral area of transparent cover  32 . The LCD panel  34  is a Liquid Crystal on Silicon Panel (LCOS Panel). The circuit carrier  36  is a Flexible Printed Circuit (FPC). The heat sink  38  is made of aluminum or copper. The LCD panel  34  comprises a color filter containing one or more colors selected from a group consisting of red, green, and blue. An air gap between the LCD panel  34  and the transparent cover  32  is used for isolating heat generated from the LCD panel  34 . It is well known by one skilled in this art that the previously mentioned material and structure are merely examples and should not be interpreted as limitations in the present invention. 
   Please refer to  FIG. 5 , which is a cross-sectional view along the line  5   5 ′ line depicted in  FIG. 4 . For simplicity, elements that have the same function as those illustrated in  FIG. 4  are given the same item numbers in  FIG. 5 . The supporter  59  can support the transparent cover  32  and stuff the opening of the heat sink  38 . The supporter  59  can be made of glass. If the heat sink  38  does not have the opening as shown in  FIG. 3 , the supporter  59  can be removed. In this situation, the circuit carrier  36  is flexible to climb over a wall of the heat sink  38 . The adhesion (not shown in  FIGS. 4 and 5 ) is used for adhering the transparent cover  32  to the heat sink  38 , so as to seal the LCD panel  34  into the LCD display module  30 , thereby achieving the objectives of water-proofing, dust-prevention, air tightness and heat dissipation. 
   Please refer to  FIG. 6 , which shows a cross-sectional view of another embodiment according to the present invention. This embodiment differs from the LCD display module  30  shown in  FIG. 5 , in that the LCD display module  60  shown in  FIG. 6  has no air gap between the transparent cover  32  and the LCD panel  34 . Sometimes, a double air gap occurs as the LCD display module  30  is adhered to an optical module (not shown) also having an air gap, reducing the optical quality. To prevent such a problem from occurring, the LCD display module  60  has a vacuumed room if the transparent cover  32  is not adhered to the LCD panel  34 . 
   Please refer to FIG . 7 , which shows a cross-sectional view of a seam of the LCOS package structure. The adhesive  71 , which may be epoxy UV glue or a silicon based UV glue, is used to adhere the transparent cover  32  and the heat sink  38 , and the supporter  59  and the heat sink  38 , so that the LCD panel  34  can be sealed into the LCD display module  30 , achieving the objectives of water-proofing, dust-prevention, air tightness and heat dissipation. In addition, a water-proof glue  72  can also be smeared on the seam to enhance the effects of water-proofing, dust-prevention, and air tightness of the LCD display module  30 . The adhesive  71  and the water-proof glue  72  can be considered a first adhesive and a second adhesive, respectively. 
   Compared to the prior art, the present invention LCD display module comprises an LCD panel positioned on a heat sink for heat-dissipation, and a transparent cover for dust-prevention. Such a design is capable of not only rapidly dissipating the heat generated by the LCD panel, but also preventing dust and unwanted reflection from damaging optical quality. Furthermore, the air tightness and water-proof requirements of the LCD display module can be realized by using double adhesives to adhere the heat sink and the transparent cover. Such a design is simple and efficient for maintaining the LCD module quality. 
   Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.