TW573179B - Flat display device with touch panel - Google Patents

Description

573179 V. Description of the invention (1) 5-1 Field of the invention: The present invention relates to a front light source liquid crystal display incorporating a touch panel, and more particularly to a light guide plate combining a touch panel with a front light source of a liquid crystal display on. 5-2 Background of the Invention: Traditional reflective LCD displays generally use front light (fr ο nt 1 ight) as a light source, and then use a V-cut of a light guide plate to The light source is introduced into the liquid crystal display. As shown in the first figure, a lower glass substrate 100 serving as a lower glass substrate of a reflective liquid crystal display has a thin film transistor 102 and a passivation layer thereon. ) 104 and a reflector 106 are located on the protective layer 104. An upper glass substarte 114 is located on the reflective layer 106. A quarter wavelength plate 116 and a polarizer 118 are sequentially disposed on the upper glass substrate 114, and a color filter is sequentially disposed on the upper glass substrate 114 in a position opposite to the polar plate 1 1 8 (C ο 1 〇: rfi 1 ter) 1 1 2 and a transparent conductive layer (transparent electrode layer) 110. A liquid crystal 108 is injected between the upper and lower glass substrates 100 and 114, especially the transparent conductive layer 1 1 0 and the lower glass substrate of the upper glass substrate 1 1 4

573179 V. Description of the invention (2) Between the reflective layer L06 of the plate 100. A light guide plate 120 is on the polar plate 1 1 8, and the light source 122 is located on an end surface of the light guide plate 120. The light beam emitted from the light source 1 2 2 is introduced into the liquid crystal display through the light guide plate 120, and then the reflection plate 106 is used to implement a reflective liquid crystal display. The above-mentioned reflective liquid crystal display can be found in US patent 6 3 2 3 9 1 9 or US patent 6 3 4 9 9 9. In actual daily life, we often need to use a touch panel (t 〇 u c h p a n e 1) on the display screen, such as the introduction of sightseeing spots. Most of the current reflective LCDs are covered with the front light plate structure if a touch panel is needed. As shown in the second figure, a touch panel 1 40 is directly attached to the reflective liquid crystal display 130. N i s s h a has been proposed in patents W09963394, JP11344695, and JP2000162594 to disclose a front-lit liquid crystal display incorporating a touch panel, as shown in the third figure. However, directly attaching the touch panel to the LCD panel will not only increase the thickness and weight of the entire display module, but also reduce the light transmittance. In addition, too many transparent glass layers will not only cause the problem of excessive depth of field, but also greatly increase the weight of the entire display module. 5-3 Objects and Summary of the Invention: In view of the above-mentioned background of the invention, the conventional method of directly pasting a touch panel directly on a front-lit liquid crystal display panel has many disadvantages. The present invention

573179 V. Description of the invention (3) The main purpose is to provide a structure that combines a front light liquid crystal panel and a touch panel. The upper and lower transparent substrates of the liquid crystal display panel are designed with plastic instead of the upper and lower glass substrates, and the upper transparent substrate is used. For the design of the light guide plate, at the same time, the top V-shaped area of the upper plastic substrate is made of a transparent resin layer different from the material of the upper transparent substrate and a transparent resin layer formed through a planarization process, and then coated with a transparent conductive layer as a transparent touch panel Bottom structure. Finally, the transparent touch panel manufacturing process is used to achieve the thin and light design of the display module. Another object of the present invention is to provide a structure combining a front light liquid crystal panel and a resistive touch panel. Another object of the present invention is to provide a structure combining a front-light liquid crystal panel and a thin-film resistive touch panel. It is still another object of the present invention to provide a structure of a front light liquid crystal panel and a touch panel that combines thin and light design considerations. In the present invention, the upper transparent substrate of the liquid crystal display and the touch panel are made of plastic as the substrate, and they are combined into a single design consideration. Furthermore, this plastic substrate is used for the design of the light guide plate and the touch panel, thereby achieving a thin and light design of the display module. The next object of the present invention is to reduce the problem that the current front light is too deep for human rickets and to increase the light transmittance. A further object of the present invention is that the lower glass substrate can be made of plastic or

573179 V. Description of the invention (4) Glass is the substrate, and the material of the light guide plate can be a V-shaped section of the material of UV curing resin. A secondary object of the present invention is to save the attachment area of the polar plate and the phase difference plate for the purpose of the present design, thereby achieving material savings. Since the polarizing plate and the retardation plate in the present invention are attached to the end surface of the upper transparent substrate, the thickness of the display module can be thinner than that of the conventional technology. Another object of the present invention is to reduce the loss of light energy caused by light passing through the medium of the entire display module, thereby improving the light energy and reducing power consumption. According to the above-mentioned object, the present invention provides a flat display with a touch panel, including a reflective liquid crystal display and a touch panel. The above-mentioned reflective liquid crystal display includes at least a transparent substrate and a light source on one end surface of the aforementioned transparent substrate. The touch panel is located on the aforementioned reflective liquid crystal display, and includes at least a first transparent conductive layer on the transparent substrate, an adhesive layer on the first transparent conductive layer, and a first transparent conductive layer on the first transparent conductive layer. The second transparent conductive layer on the adhesive layer, wherein the aforementioned transparent substrate is used as the aforementioned substrate of the touch panel. 5-4 Invention Details:

573179 V. Description of the invention (5) Some embodiments of the present invention will be described in detail as follows. However, in addition to detailed and detailed descriptions, the present invention can also be widely implemented in other embodiments, and the scope of the present invention is not limited, which is subject to the scope of subsequent patents. — The present invention mainly provides a flat panel display with a touch panel, including a reflective liquid crystal display and a touch panel. The above-mentioned reflective liquid crystal display includes at least a transparent substrate and a light source located on one end surface of the aforementioned transparent substrate, wherein the above-mentioned transparent substrate is a light guide plate, and a plastic substrate can be used for its material. The aforementioned touch panel is located on the aforementioned reflective liquid crystal display, and includes at least a first transparent conductive layer on the aforementioned transparent substrate, an adhesive layer on the aforementioned first transparent conductive layer, and a The second transparent conductive layer on the aforementioned adhesive layer, wherein the aforementioned transparent substrate is used as the aforementioned substrate of the touch panel. The above-mentioned flat display with a touch panel further includes a transparent thin film layer located between the aforementioned transparent substrate and the aforementioned first transparent conductive layer. The material is made of a transparent resin and is formed through a planarization process. The light refractive index of the aforementioned light guide plate is different from that of the aforementioned transparent film. The above-mentioned flat display with a touch panel further includes a polarizing plate located between the aforementioned light source and the end surface of the aforementioned light guide plate.

Page 9 573179 V. Description of the invention (6) The above-mentioned flat display with a touch panel further includes a phase difference ~ plate located between the aforementioned light source polarizing plate and the aforementioned end surface of the light guide plate. The above-mentioned flat display with a touch panel further includes a retardation plate located between the light source and the end surface of the light guide plate. The above-mentioned reflective liquid crystal display includes a color filter located on the other side of the light guide plate opposite to the touch panel, wherein the light refractive index of the light guide plate is different from the light refractive index of the color filter. In addition, the above-mentioned reflective liquid crystal display includes a transparent flat plate located on the opposite side of the aforementioned touch panel from the aforementioned light guide plate, wherein the hardness of the transparent flat plate is greater than that of the aforementioned light guide plate. The material of the light guide plate may be a UV-curable resin, and the material of the transparent plate may be transparent glass. In the above-mentioned flat panel display with a touch panel, the light source may be a dual light source type, which is located on the opposite ends of the transparent substrate. The invention also provides a structure combining a front light source liquid crystal panel and a touch panel, which includes a matrix thin film transistor on a first substrate, a liquid crystal layer 'and a second transparent substrate', and A light source on one end surface of the two transparent substrates, a polarizing plate located between the foregoing light source and the second transparent substrate, and a polarizing plate located between the foregoing polarizing plate and the foregoing

Page 10 573179 V. Description of the invention (7) A phase difference plate between the second transparent substrates, and a transparent film, a first transparent conductive layer, and an adhesion-layer on the second transparent substrate are sequentially located at the same time. , And a second transparent film. The first substrate, the matrix thin-film transistor, the liquid crystal layer, the second transparent substrate, the light source, the polarizing plate, the phase difference plate, and the transparent film constitute the aforementioned liquid crystal panel of the previous light source. The above-mentioned transparent film, the first transparent conductive layer, the adhesive layer, and the second transparent film layer constitute the aforementioned touch panel. Next, an embodiment of a flat display with a touch panel is described according to the present invention. As shown in the fourth figure, a first transparent substrate 10 is used as the lower transparent substrate of the liquid crystal display, and the material can be plastic or glass. When the material of the first transparent substrate is plastic, the purpose of weight reduction of the display can be achieved. When glass is used as the material of the first transparent substrate, it has better rigidity for a large-sized display. The matrix-type or array-type thin-film electrical crystal 12 is formed on the first transparent substrate 10 'as a control-switch of the liquid crystal display to increase the response time of the liquid crystal display. A protective layer 14 is formed on the thin film transistor 12 and the first transparent substrate 10 to protect the thin film transistor 12. A reflection layer 16 for reflecting the front light is located on the protective layer 14 in this embodiment, but it may be located below the first transparent substrate 10. Next to the reflective layer 16 are liquid crystal 18 in order, an indium antimony oxide layer as a transparent conductive layer 20, a color filter 22 as a color display, and a second transparent substrate as an upper transparent substrate. Substrate 24. The second transparent substrate 24 can be made of plastic or glass. When the material of the second transparent substrate 24 is plastic, the weight reduction of the display can be achieved. When the second transparent substrate 2 4

Page 11 573179 V. Description of the invention (8) When glass is used as the material, it has better rigidity for large-sized displays. In the present invention, the second transparent substrate 24 can be used as a light guide plate, and is not limited to a flat plate, a flat plate, a hollow plate, or any other type of light guide plate. The refractive index of the second transparent substrate 24 is different from the refractive index of the color filter 22. A light source 30 is provided on one end surface of the second transparent substrate 24, and a polarizing plate 28 and a retardation plate 26 are provided between the light source 30 and the second transparent substrate. In the present invention, the light source 30 can be a cold cathode fluorescent tube (C C F L), a light emitting diode (LED), or other similar light sources. The second transparent substrate 24 can use a V-shaped cut surface or other light guiding devices such as halftone dots to guide the light source on the side down to the liquid crystal display. Here, the retardation plate 26 is a 1/4 wave retardation plate. Such a structure can save the attachment area of the polarizing plate 28 and the retardation plate 26, and also reduce the thickness of the entire display module. In the present invention, the second transparent substrate 24 is used as a substrate of a conventional touch panel, so a transparent conductor layer 4 4 _ is coated on the second transparent substrate 24 as a lower electrode plate of the touch panel. Then, an adhesive layer 46 and an upper electrode plate 48 are sequentially formed on the transparent conductor layer 44 in order to complete a touch panel. In the present invention, a resistive touch panel is used. The fifth figure mainly introduces the general process and components of the touch panel 50, which is formed by laminating the upper electrode plate 52, the adhesive layer 54, and the lower electrode plate 56. The upper electrode plate 52 is sequentially formed by the thin film layer f. (Film) 5 2 2, PET layer 5 2 4, upper conductive layer (Conductive Coating) 526 and silver glue layer (Silver Bus) 528, and the lower electrode plate 56 in order

Page 12 573179 V. Description of the invention (9) It is composed of a silver bus layer (Silver Bus) 562, an insulation layer (Spacer Dots) 564, a lower conductive layer (Conductive Coating) 566 and a lower substrate 568. A second transparent substrate of a liquid crystal display is used. When the second transparent substrate 24 of the liquid crystal display is used as a light guide plate, its surface is not flat. Therefore, a transparent film 4 2 must be formed on the second transparent substrate 24 and subjected to a planarization process. As the material of the transparent film 42, a transparent resin can be used, and its light refractive index is different from that of the second transparent substrate 24. In the present invention, the second transparent substrate 24, which is the upper transparent substrate of the liquid crystal panel, does not necessarily have to be the light guide plate. As shown in the sixth figure, it is another embodiment of the present invention, in which the material of the second transparent substrate 24 is glass, and then a V-shaped cut surface or another type of guide is used on the second transparent substrate 24. A light device, and a light guide plate 38 made of a material of an ultraviolet curing resin. Such a structure is suitable for a large-sized display device. Furthermore, the light source of the present invention is not limited to using a single light source. As shown in FIG. 7, light sources 30 and 32 are respectively provided on opposite sides of the second transparent substrate 24 to improve the brightness of the entire display module. In the present invention, the upper transparent substrate of the liquid crystal display is used as the transparent substrate of the lower electrode plate of the touch panel, which indeed has quite good advantages. Relative to current

Page 13 573179 V. Description of the invention (ίο) The main weight of the liquid crystal display module with touch panel is mostly the glass substrate itself, and the thickness is also increased due to the front light guide module and the touch panel. Therefore, the display module designed by the present invention has the advantages of lightness and thinness, and at the same time, it can reduce the problem that the depth of field of the current front light is too deep. In addition, since the polarizing plate and the retardation plate of the present invention are attached to the end surface of the plastic substrate, the saving of the material for attaching the polarizing plate and the retardation plate can be achieved, and the thickness of the entire display module can be compared with the conventional technology. thin. Since the number of transparent materials used is reduced, the overall display module can increase light transmission and improve brightness. The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of patent application of the present invention. Any other equivalent changes or modifications made without departing from the spirit disclosed by the present invention shall be included in the following Within the scope of patent application.

Page 573179 Brief description of the diagram Brief description of the diagram: '... The first diagram shows the structure of a conventional reflective liquid crystal display; the second diagram shows a schematic diagram of a touch panel directly attached to the liquid crystal display. The device displays the crystal liquid on the stick surface and touches the \ lQui species separately; the graphic image shows the third structure showing the crystal liquid type reflection and the panel surface 0 combined with the species; The intention is to show the composition of the fourth device in the composition diagram and the process of the surface control of the system, as shown in the fifth image of the liquid crystal shot and the surface control of the combination of the other; The clear figure noticed that the sixth device of the present display structure display structure, the first display crystal liquid ejection reaction and the surface control of the plate, UQul species I, and then. Bright drawing Intentions This display shows the structure of the seven pictures of the first display body crystal plate electric base film No. thin standard penetration test a row to participate, one by one nu 0X0 rod

Page 15 573179 Brief description of drawings 14 Protective layer ... 1 6 Reflective layer-18 Liquid crystal 2 0 Transparent conductive layer_ 22 Color filter 2 4 Second transparent substrate 2 6 Phase difference plate 28 Polarizer plate 3 0 Light source 32 Light source 38 Light guide plate 42 Transparent film 44 Transparent conductor layer 46 Adhesive layer 4 8 Upper electrode plate-5 0 Touch panel 5 2 Upper electrode plate ^ 54 Adhesive layer 5 6 Lower electrode plate 5 2 2 Thin film layer 524 PET layer 5 2 6 is conductive Layer 5 2 8 silver glue layer 5 6 2 silver glue layer

Page 16 573179 Brief description of drawings 564 Insulation layer 566 Lower conductive layer 568 Lower substrate 1 00 Substrate 1 02 Matrix film 1 04 Protective layer 1 06 Reflective layer 108 Liquid crystal 110 Transparent conductive layer 112 Color filter 1 14 Upper glass substrate 116 retardation plate 118 polarizing plate 120 light guide plate 122 light source 130 reflective liquid crystal 140 touch panel Φ

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Claims (1)

12 573179 Patent application scope t 1. A flat display with a touch panel, comprising: a reflective liquid crystal display including at least a transparent substrate and a light source on one end surface of the transparent substrate; and a touch panel on the reflective surface Liquid crystal display, at least including a first transparent conductive layer on the transparent substrate, an adhesive layer on the first transparent conductive layer, and a second transparent conductive layer on the adhesive layer, wherein the transparent substrate is used as A substrate of the touch panel. 2. The flat display with a touch panel as described in the first item of the patent application, wherein the transparent substrate is a light guide plate. 3. The flat panel display with a touch panel according to item 2 of the patent application scope, further comprising a transparent film layer between the transparent substrate and the first transparent conductive layer. 4. For a flat panel display with a touch panel as described in item 3 of the patent application, wherein the transparent film is made of transparent resin. 5. For a flat panel display with a touch panel as claimed in item 3 of the patent application, wherein the transparent film is formed by a planarization process. 6. If a flat panel display with a touch panel is applied for item 3 of the scope of patent application, Page 18 573179 6. Scope of patent application Wherein the light refractive index of the light guide and plate is different from that of the transparent film. 7. The flat-panel display with a touch panel according to item 2 of the patent application scope, further comprising a polarizing plate located between the light source and an end surface of the light guide plate. 8. The flat display with a touch panel according to item 7 of the patent application scope, further comprising a retardation plate located between the polar plate and the end surface of the light guide plate. 9. The flat display with a touch panel as described in item 2 of the patent application scope, further comprising a retardation plate located between the light source and an end surface of the light guide plate. 10. The flat-panel display with a touch panel according to item 2 of the patent application, wherein the above-mentioned reflective liquid crystal display includes a color filter on the other side of the light guide plate opposite to the touch panel. 11. A flat display with a touch panel as described in claim 10, wherein the light refractive index of the light guide plate is different from the light refractive index of the color filter. 12. The flat display with a touch panel according to item 2 of the patent application, wherein the material of the light guide plate is a plastic substrate. Page 19 of 573179 VI. Application for Patent Scope 1 3 · For the flat display with a touch panel as described in the second item of the patent application, the above-mentioned reflective liquid crystal display includes a transparent flat plate located on the light guide plate opposite to the touch panel. On the other side, the hardness of the transparent flat plate is greater than the hardness of the light guide plate. 1 4. The flat panel display with a touch panel according to item 13 of the scope of patent application, wherein the material of the light guide plate is an ultraviolet curing resin. 15. A flat display with a touch panel as described in item 13 of the scope of patent application, wherein the material of the transparent flat plate is transparent glass. 1 6. The flat panel display with a touch panel according to item 1 of the scope of patent application, wherein the light source described above is a dual light source type, which is located on the opposite end surfaces of the transparent substrate. 1 7. A structure combining a front light source liquid crystal panel and a touch panel, including a first substrate; a plurality of matrix thin-film transistors are located on the first substrate; a liquid crystal layer is positioned on the plurality of matrix thin-film transistors A second transparent substrate is located on the liquid crystal layer; a light source is located on one end surface of the second transparent substrate; a polarizing plate is located between the light source and the second transparent substrate; a phase difference plate is located on the polarizing plate And the second transparent substrate; a transparent film is located on the second transparent substrate; Page 20 573179 6. Scope of patent application A first transparent conductive layer is located on the transparent film; an adhesive layer is located on the first transparent conductive layer; and a second transparent film is located on the first transparent film. 1 8. The structure combining a front light source liquid crystal panel and a touch panel according to item 17 of the scope of patent application, wherein the above-mentioned first substrate, the plurality of matrix thin film transistors, the liquid crystal layer, and the second transparent substrate, The light source, the polarizing plate, the retardation plate, and the transparent film constitute the front light source liquid crystal panel. 19. The structure of a front light source liquid crystal panel and a touch panel according to item 18 of the scope of patent application, wherein the above-mentioned transparent film, the first transparent conductive layer, the 'adhesive layer, and the second transparent film layer This touch panel is configured. Participate Page 21