Liquid crystal cells – elements and systems – Liquid crystal system – Liquid crystal writing tablet
Reexamination Certificate
2001-09-13
2003-03-25
Sikes, William L. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Liquid crystal writing tablet
C349S155000, C349S143000
Reexamination Certificate
active
06538706
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to flat panel display and, more particularly, to liquid crystal display panels having touch panel function and a process for making themselves.
2. Description of Related Art
Currently, various transparent touch panels such as resistance type touch panels, static-electricity-capacity type touch panels and pressure-sensor type touch panels are widely applied in different fields. Recently, liquid crystal display panels combined with touch panels become popular in business and entertainment. Generally, the liquid crystal display panel having touch panel function is achieved by stacking a touch panel on a liquid crystal display panel. Through this way, the light emitting from the light source, i.e. the backlight unit, goes through the liquid crystal display panel and the stacked transparent touch panel to display images. At the same time, the touch panel mounted on the liquid crystal display panel acts as an interface or a medium for inputting foreign signals.
However, this combined device of stacked touch panel and liquid crystal display panel is heavy since the whole set of touch panel device is required to mounted on the liquid crystal touch panel. In addition, for reducing the quivering between the whole set of stacked touch panel and liquid crystal display panel, a protection film (or a rubber cushion layer) is usually placed between the stacked touch panel and the liquid crystal display panel. Therefore, the thickness of the combined panel device increases. Furthermore, most touch panels mounted on the liquid crystal display panels use PET (polyethylene terephthalate) film for supporting the conducting electrodes for sensing the location of pressure on the screen, the brightness of the combined panel device decreases because the reflection and the absorption of the light caused by the PET films increases very much. An improvement for the combination of the stacked liquid crystal display panel and touch panel is necessary now.
Therefore, it is desirable to provide an improved liquid crystal display panel with a built-in touch panel to mitigate the aforementioned problems.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a flat panel display with small thickness, light-weight and a built-in touch panel.
Another object of the present invention is to provide a flat panel display which can reduce the loss of the intensity of the light penetrating through the panels.
Another object of the present invention is to provide a method for manufacturing a flat panel display
1
with small thickness, light weight and built-in touch panel function.
To achieve the object, the liquid crystal display panel of the present invention includes a display comprising one first substrate, one second substrate, a bottom polarizer and a liquid crystal layer; wherein said liquid crystal layer locates between said first substrate and said second substrate, said bottom polarizer locates on the surface of said second substrate; a top polarizer, said top polarizer locating above said first substrate; a plurality of parallel stripes of first electrodes, said first electrodes locating between said top polarizer and on the surface of said first substrate; a plurality of parallel stripes of second electrodes, said second electrodes locating between said top polarizer and said first substrate and between said top polarizer and said first electrodes, wherein said second electrodes are in parallel stripes; and a plurality of spacers, said spacers locating between said top polarizer and said first substrate or between said top polarizer and said first electrodes; wherein the projection of said first electrodes on said first substrate intersects the projection of said second electrodes on said first electrodes.
The method for manufacturing a liquid crystal display panel, comprising following steps: providing a display comprising a first substrate, a second substrate, a bottom polarizer and a liquid crystal layer; wherein said liquid crystal layer locates between said first substrate and said second substrate, said bottom polarizer locates on the surface of said second substrate; forming a plurality of first electrodes in parallel stripes on said first substrate; spraying spacers on the surface of said first substrate to form a layer of spacers; forming a plurality of second electrodes in parallel stripes on a top polarizer or on a top PET (polyterephthalate) film; and placing said top polarizer or said top PET (polyterephthalate) film on said first substrate and said layer of spacers; wherein the projection of said second electrodes on said first substrate intersect the projection of said first electrodes on said first substrate.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5677744 (1997-10-01), Yoneda et al.
patent: 5852487 (1998-12-01), Fujimori et al.
patent: 6069675 (2000-05-01), Mizobata et al.
Akkapeddi P. R.
Sikes William L.
UNIPAC Optoelectronics Corporation
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