Patent Document

BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a display, and more particularly, to a display, which can reduce the optical interference in a picture produced by the display.  
         [0003]     2. Description of the Prior Art  
         [0004]     Portable intelligent information products are becoming increasingly popular while the technology changes with each passing day. The display plays an important role as a medium between human beings and machines. The LCD module has a thin shape, low power consumption, a small divergence, etc, which makes the LCD module useful for applications such as portable intelligent information products (ex: notebooks, PDAs, and cellular phones . . . ). The LCD module has a huge market share with consumer information products, and is gradually replacing the desktop computer CRT monitor and the traditional TV.  
         [0005]     In general, a LCD module comprises a liquid crystal display panel, a light source, a light guide plate, and several kinds of optical films. Please refer to  FIG. 1 .  FIG. 1  is a cross-section diagram of a LCD module  10  according to the prior art. As  FIG. 1  shows, the LCD module  10  comprises a liquid crystal display panel  12  and a back light module  14 . In general, the liquid crystal display panel  12  comprises two glass substrates and a liquid crystal layer between the glass substrates. xxxxx The back light module  14  comprises a light source (not shown), a light guide plate  16 , and a plurality of optical films, such as the diffusion film  18  and two prisms  20 ,  22  shown in  FIG. 1 , wherein there are pluralities of diamond pillars or half-cylinder patterns, perpendicularly aligned in a matrix array, formed on the surface of prism  20  and the surface of prism  22 . The function of the prisms  20 ,  22  is for controlling the light angle of the back light module, centralizing the light angle, and providing a better light source to the liquid crystal display panel  12 . However, the color filters and TFTs of the liquid crystal display panel  12  are strip arrays. When light passes through the prism light guide plate and prisms  20 ,  22  into the liquid crystal display panel  12 , the moiré effect and other optical problems will occur due to the structure of the prisms  20 ,  22 . Otherwise, if the prisms  20 ,  22  are smooth films, interference problems, such as the moiré effect and the Newton&#39;s Ring effect, will easily occur. The above-mentioned optical problems cause a worse quality picture, and are especially noticeable in large sided displays.  
         [0006]     These problems have forced the display manufacturers to display misalignment of patterns of the prisms  20 ,  22  in order to reduce the optical interference problem. However, this design increases the cost of the prisms  20 , 22 . That is why finding a simple effective way to solve the optical interfere problem of the display is the point of the present invention.  
       SUMMARY OF THE INVENTION  
       [0007]     The main purpose of the present invention relates to providing a display having a diffusion layer, wherein the diffusion layer formed on an upper surface or a lower surface of a flat display panel to solve the above-mentioned optical problem.  
         [0008]     According to the claimed invention, a display comprises a flat display panel, and at least one polarizer formed on an upper surface of the flat display panel or a lower surface of the flat display panel, the polarizer having at least one rough surface.  
         [0009]     According to the claimed invention, a display module comprises an upper transparent substrate, a lower transparent substrate, which is parallel with and is beneath the upper transparent substrate, a liquid crystal layer formed between the upper transparent substrate and the lower transparent substrate, an upper polarizer adhered to an upper surface of the upper transparent substrate by an upper adhesive, and a lower polarizer adhered to a lower surface of the lower transparent substrate by a lower adhesive. The upper adhesive or the lower adhesive is a diffusing adhesive, which is able to scatter light.  
         [0010]     According to the claimed invention, a method of reducing an optical interference of a display is introduced. The display comprises a flat display panel and a back light module under the flat display panel, and the back light module comprises at least an optical diaphragm, such as a prism. The method comprises providing a diffusion layer on an upper surface of the flat display panel or a lower surface of the flat display panel to scatter light from the back light module and to solve the optical interference problem.  
         [0011]     The present invention has a diffusion layer on the upper or lower surface of the flat display. For example, the polarizer has the rough surface or the diffusion layer has the diffusing adhesive. Therefore, the light from the back light module is scattered, so that the optical interfere (ex: the moiré and the Newton&#39;s Ring) is reduced, and the picture quality is improved, too.  
         [0012]     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 THE DRAWINGS  
       [0013]      FIG. 1  is a cross-section diagram of a LCD module according to the prior art.  
         [0014]      FIG. 2  is a cross-section diagram of a display according to the first embodiment of the present invention.  
         [0015]      FIG. 3  is a cross-section diagram of a display according to the second embodiment of the present invention.  
         [0016]      FIG. 4  is a diagram of a display module according to the third embodiment of the present invention.  
         [0017]      FIG. 5  is a cross-section of a display module according to the fourth embodiment of the present invention.  
         [0018]      FIG. 6  is a cross-section diagram of a display module according to the fifth embodiment of the present invention.  
     
    
     DETAILED DESCRIPTION  
       [0019]     Please refer to  FIG. 2 .  FIG. 2  is a cross-section diagram of a display  50  according to the first embodiment of the present invention. The display  50  comprises a flat display panel  152  and a back light module  54 . The back light module  54  has a light source  78 , a light guide plate  70 , and a plurality of optical diaphragms, which individually are diffusion film  72  and two prisms  74 ,  76  having perpendicular patterns with each other. The light source  78 , which is an LED chip or a traditional light, produces light. The light guide plate  70  guides the path of the light, and the light is scattered into the whole light guide plate  70 . In the first embodiment, the light guide plate  70  has prism functionality. The diffusion film  72  can further scatter light, and the emitted light from the emitted light surface of the light guide plate  70  is more uniform. The illumination and luminance of the back light module  54  are increased by the pillar pattern surface of the prisms  74 ,  76 .  
         [0020]     The flat display panel  152  comprises an upper transparent substrate  56 , a lower transparent substrate  58 , a liquid crystal layer  60  between the upper transparent substrate  56  and the lower transparent substrate  58 , an upper polarizer  64  and a lower polarizer  62 . The upper polarizer  64  and the lower polarizer  62  adhere to the upper surface of the upper transparent  56  with an upper adhesive  68  and the lower surface of the lower transparent substrate  58  with a lower adhesive  66  individually. The upper transparent substrate  56  and the lower transparent substrate  58  are made from nonconductors such as quartz or glass. The penetration axis of the upper polarizer  64  is perpendicular to the penetration axis of the lower polarizer  62 . Please note that a diffusion layer is provided under the lower surface of the flat display panel  52  in the first embodiment to improve the optical interfere problem of the flat display panel  52 . That means a rough lower surface  62   a  of the lower polarizer  62  is made with a rough process, for scattering light. Hence, when light is emitted out and passes into the flat display panel  152 , the light will pass through the rough lower surface  62   a  of the lower polarizer  62 , and the rough lower surface  62   a  will reduce the optical interfere by changing the light path, and the quality of the display  50  picture will thereby be improved.  
         [0021]     In the second embodiment of the present invention, spread particles  80  are added into the transparent lower adhesive  66  to make the lower adhesive  66  become a diffusing adhesive that can scatter light for increasing the scatter light function of the polarizer  62 , and the optical interfere problem improves. Please refer to  FIG. 3 .  FIG. 3  is a cross-section diagram of a display  50  according to the second embodiment of the present invention. For convenient explanation, like components of  FIG. 3  continue to use the reference numbers used in  FIG. 2 . The lower polarizer  62  adheres with the lower surface of the lower transparent substrate  58  by the lower adhesive  66 . There are a plurality of spread particles  80  in the lower adhesive  66  that adjust the shape, size and index of reflection of the spread particle  80  or the density of the lower adhesive  66  to control the scattering light effect. The scattering light from the lower surface of the lower polarizer  62  is therefore more scattered. The optical interference is reduced, and the possible moire and the Newton&#39;s Ring are removed from the display picture.  
         [0022]     Please refer to  FIG. 4 .  FIG. 4  is a diagram of a display module  100  according to the third embodiment of the present invention. The display module  100  comprises a first part  102  and a second part  104 . The first part  102  is a flat display panel  106 , which comprises an upper glass substrate, a lower glass substrate, a liquid crystal layer, an upper polarizer  108  on the upper lateral of the flat display panel, and a lower polarizer  110  on the lower lateral of the flat display panel. The upper polarizer  108  is adhered to the surface of the flat display panel  106  by the upper adhesive  112 , and the lower polarizer  110  is adhered to the surface of the flat display panel  106  by the lower adhesive  114 . The second part  104  comprises a back light module, which comprises a light source (not shown), a light guide plate  115 , a diffusion film  116 , and two prisms  118 ,  120 .  
         [0023]     In the third embodiment, an upper surface  108   a  of the upper polarizer  108  undergoes a rough process, so the upper surface  108   a  is rough. Otherwise, the upper adhesive  112  is a diffusing adhesive, which can scatter light. The manufacture of the diffusing adhesive is performed by doping the spread particles  122  with light-scattering function into the general adhesive to achieve the scatter light effect. Because the rough surface  108   a  of the upper polarizer  108  in the display module  100  has the upper adhesive  112 , together they make a diffusion layer  124  to reduce interference stripes, for increasing the quality of the picture by scattering the light from the liquid crystal layer gently.  
         [0024]     Please refer to  FIG. 5 .  FIG. 5  is a cross-section of a display module  150  according to the fourth embodiment of the present invention. The display module  150  comprises a first part  152  and a second part  154 . The first part  152  comprises a liquid crystal display panel  156 , and the second part  154  mainly contains a back light module, which comprises a light source (not shown), a light guide plate  165 , a diffusion film  166  and two prisms  168 ,  170 . The upper and lower surfaces of the liquid crystal display panel  156  individually comprise an upper diffusion layer and a lower diffusion layer, which means both of the surfaces of a first polarizer  158  and a second polarizer  160  are rough surfaces. The fourth embodiment has the first and second polarizers  158 ,  160 , a rough upper surface  158   a , and a rough lower surface  160   a  to increase the scatter effect for reducing the optical interference. Furthermore, the first and the second adhesives  160 ,  164  of the first and the second polarizers  158 ,  160  can also be doped with spread particles  1   72 , as  FIG. 5  shown. The thickness of the upper and lower diffusion layer increases, which improves the scatter light effect and the display picture.  
         [0025]     Please note that adjusting the rough angle or shape of the upper surface  158   a  and the lower surface  160   a  of the first or second polarizers  158 ,  160  can control the illumination, luminance, and micro-reflection of the display module  150 , for increasing the picture quality of the display module  150 .  
         [0026]     Please refer to  FIG. 6 .  FIG. 6  is a cross-section diagram of a display module  200  according to the fifth embodiment of the present invention. As mentioned above, the display module  200  comprises a first part  202  and a second part  204 . The second part  204  is a back light module, which comprises a light source (not shown), a light guide plate  216 , a diffusion film  218  and two prisms  222 ,  224  with perpendicular patterns. The first part  202  comprises a liquid crystal display panel  214 , which has an upper polarizer  206  and a lower polarizer  208  adhere to the upper surface and the lower surface of the liquid crystal display panel  214  individually. There is an upper diffusing adhesive  210  between the upper polarizer  206  and the liquid crystal display panel  214 , and a lower diffusing adhesive  212  between a lower polarizer  208  and the liquid crystal display panel  214 . The upper spread adhesive  210  and the lower spread adhesive  212  are used to adhere the upper polarizer  206  and the lower polarizer  208  with the surfaces of the liquid crystal display panel  214 . The upper diffusing adhesive  210  and the lower diffusing adhesive  212  further have a scatter light function, which causes the light from the second part  204  and the liquid crystal display panel  214  to pass into the lower diffusing adhesive  212  and upper diffusing adhesive  210  in a scattered manner. That reduces the optical interference between the prisms  222 ,  224  and the liquid crystal display panel  214 . The upper diffusing adhesive  210  and the lower diffusing adhesive  212  on the lateral sides of the liquid crystal display panel  214  in this embodiment serve as diffusion layers to achieve the goal of scattering light and for improving the picture quality caused by optical interference without any polarizers with rough surfaces. Besides, the manufacture of the upper diffusing adhesive  210  and the lower diffusing adhesive  212  is not restricted to doping the spread particles  220  into the general adhesive, and can also be made by other scattering materials.  
         [0027]     In summary, the present invention reduces optical problems occurring in the prism of the back light module and flat display panel. The diffusion layer forms on the upper or lower surface of the flat display in the present invention for scattering light from the back light module so as to improve the picture quality. In the present invention, the diffusion layer can use a polarizer having a rough surface, a diffusing adhesive for adhering the polarizer, or use both in combination with each other. Comparing with the prior art, the present invention has no scatter film in the back light module, and as a result can reduce the required thickness. The present invention only modifies the existing material with a simple manufacturing process to achieve the goal of improving picture quality.  
         [0028]     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.

Technology Category: 3