KR20070077619A - Display panel having touching circuit - Google Patents

Abstract

A display panel having a contact circuit is provided to install a contact circuit layer to the inside of the display panel, thereby reducing the assembly time and cost. A lower glass substrate(22) is offered to the lower portion of a lower polarizer(21). An upper glass substrate is offered to the upper portion of an upper polarizer. An upper transparent ITO(Indium Tin Oxide) layer(23) is offered to the lower portion of the upper glass substrate. A lower transparent ITO layer is offered to the upper portion of the lower glass substrate. A middle liquid crystal layer(24) is interposed between the transparent ITO layers. A touching circuit layer(25) is interposed between the upper polarizer and the upper glass substrate and arranged on the liquid crystal layer. The touching circuit layer includes plural coating circuits formed on the upper glass substrate located toward the upper polarizer. The touching circuit layer is offered on the liquid crystal layer and interposed between the upper polarizer and the upper glass substrate.

Description

Display panel with contact circuit {DISPLAY PANEL HAVING TOUCHING CIRCUIT}

1 is a cross-sectional side view of a typical contact panel placed over a display.

2 is a cross-sectional side view of a display panel having a contact circuit according to the present invention.

3 is a perspective view of a contact circuit layer in accordance with the present invention.

4 is a cross sectional view of a lower embodiment of the present invention.

5 is a cross-sectional side view of another display panel having a contact circuit according to the present invention.

6, 7 and 8 are perspective views of the first, second and third lower embodiments of another display panel with a contact circuit according to the invention.

After careful research and experimentation, display panels with contact circuits according to the present invention are designed to overcome the above disadvantages of prior art (eg, discrete manufacturing, assembly, increased costs, light dendence, reliability problems, etc.). come.

 An object of the present invention is an upper polarizer; Bottom polarizer; A lower glass substrate provided over the lower polarizer; An upper glass substrate provided below the upper polarizer; An upper transparent ITO layer provided below the upper glass substrate; A bottom transparent ITO layer provided over the bottom glass substrate; An intermediate liquid crystal layer sandwiched between transparent ITO layers; And a display panel having a contact circuit layer interposed between the upper polarizer and the upper glass substrate and arranged on the liquid crystal layer. By the above configuration, the contact circuit layer is installed in the display panel rather than assembled together after manufacture.

Another object of the present invention is a top polarizer; Bottom polarizers; A bottom glass substrate provided over the bottom polarizer; An upper glass substrate provided below the upper polarizer; An upper transparent ITO layer provided below the upper glass substrate; A bottom transparent ITO layer provided over the bottom glass substrate; An intermediate liquid crystal layer sandwiched between transparent ITO layers; An upper contact circuit layer sandwiched between the upper polarizer and the upper glass substrate; And a lower contact circuit layer sandwiched between a lower polarizer and a lower glass substrate. The upper and lower contact circuit layers each have a space from the upper and lower surfaces of the liquid crystal layer. By using this display panel with two coated circuit layers, it is not necessary to manufacture the contact panel and display panel separately and to assemble them as experienced by the previous technology, resulting in assembly time, assembly cost and manufacturing cost Decreases.

The above advantages and features of the present invention and the remaining objects will become apparent from the drawings associated with the following detailed description of the invention.

  The present invention relates to a display panel and more particularly to a contact type in order to secure the glass substrate and the transparent ITO layer required for manufacturing the contact circuit in the prior art and to avoid the process of assembling the display panel and the contact circuit together. It is related to such a display panel having a circuit layer.

Products related to information, communication and electronics have been known for their rapid and spectacular development in recent years thanks to technological advances that make electronic products more powerful and easier to cooperate with one of many other input devices. In detail, the contact panel can be used as an input method of an electronic product as a substitute for a typical input device (eg, a keyboard or a mouse). The development of touch panels is revolutionary in typical input devices. The touch panel has a suitable input interface. Almost everyone will use a lightpane or finger to point to an icon on the touch panel and can run it without any special instructions or learning. As a result, touch panels are widely installed in various electronic products, including handheld personal computers (PCs), personal digital assistants (PDAs), and information devices. Moreover, touch panels can be applied to workstation systems, guidance systems, medical purposes, information service stations and computers to help children's teaching. In summary, the application of touch panels is diversified and their markets are growing very fast.

The touch panel is implemented as a glass panel composed of a conductive film and a conductive glass, as will be described later. Buses of the circuit board and control integrated circuits (ICs) on the touch panel are arranged corresponding to the position of the icon on the screen. As a result, pointing the icon on the touch panel can perform the function described by the icon. Electronic products, including touch panels, allow a user to touch the screen for direct input. Thus, the remaining typical input devices are not needed to install electronics. As a result, much space can be secured to permit installation of a wide display panel for user browsing.

A well known touch panel mounted over a display is shown in FIG. As shown the touch panel 10 rests on the panel 11 of the display. With respect to the touch panel 10 over the panel 11, a sponge 12 is provided between the touch panel 10 and the panel 11. The touch panel 10 includes an indium tin oxide (ITO) coated with an ITO conductive layer, and a transparent ITO film 102 composed of an ITO object. Silver paste on the transparent ITO glass 101 and the ITO film 102 is printed at the edges of the ITO glass 101 and the ITO film 102 by a screen printing process to form the required control circuit. From the low transparent ITO glass 101 and the upper transparent ITO film 102, a first separation layer 103, an adhesive layer 104 and a second separation layer 105 are provided. A plurality of dot spacers 106 maintain a constant space between the low transparent ITO glass 101 and the upper transparent ITO film 102.

The display is a liquid crystal display (LCD). The panel 11 includes a liquid crystal layer 111, two transparent ITO layers 112, an upper polarizer 113, a lower polarizer 114, an upper glass substrate 115, and a lower glass substrate 116. ). The upper polarizer 113 and the lower polarizer 114 are provided at the bottom surface and the top surface of the panel 11, respectively. The liquid crystal layer 111 is provided in the panel 11. The transparent ITO layer 112 is provided at the top and bottom of the liquid crystal layer 111, respectively. The glass substrate 115 is sandwiched between the upper transparent ITO layer 112 and the upper polarizer 113. The lower glass substrate 116 is sandwiched between the lower transparent ITO layer 112 and the lower polarizer 114. As a result, in response to protecting the icon on the panel 11, the user indicates the icon by touching a point on the touch panel 10 corresponding to the icon for direct input and / or operation.

However, the panel 11, the touch panel 10, the transparent ITO glass 101, the upper glass substrate 115 and the lower glass substrate 116 installed in the well-known display are formed of the same material. In addition, the panel 11 and the touch panel 100 are formed separately before being assembled together. Disadvantageously, the manufacturers of the panel 11 and the touch panel 10 as a whole member have a high investment cost of manufacturing equipment. A lot of material will be wasted, moreover the touch panel 10 is required to fit the size and shape of the panel 11 in the design phase, and moreover, after manufacturing both the panel 11 and the touch panel 10. It is required to assemble the panel 11 and the touch panel 10. It increases the time and low production as well as the result of a large increase in the manufacturing cost. It is required among manufacturers to reduce the time.

Touch technology is integrated into the LCD by the rest of the technology. U.S. Patent 6,483,498 teaches how to integrate the resistive touch screen of an LCD. This technique requires a physical touch and a flexible top sheet between the two conductive layers required to make contact. This method will easily accept the disadvantages of resistive type touch screens. Moreover, this approach would require conductive sheets with uniform conductivity integrated into the LCD. U.S. Patent 6,501,529B1 teaches how to incorporate resistive contact technology into a given LCD. This approach uses spacers in the liquid crystal region of the LCD screen to reduce the amount of movement on the upper surface. There is still movement on the surface to make contact between the two conductors detecting the contact location. This may be a loss in the reliability of the units. It is important to note that adding a spacer object between the top and bottom is a very challenging manufacturing operation. U.S. Patent 5,105,186 teaches how to inject transsflectors into an LCD. When light passes in front of the screen it is reflected from the transflector and detected by the phototransistor. If light is blocked, then the amount of light intensity detected by the phototransistor reduces the pointing contact point. This method is inherent in some photosensitive devices. The most important and difficult thing to overcome this issue is the scattered ambient light in the environment affecting the operation of the screen. U. S. Patent 6,831, 710 also discloses the structure of an LCD screen with an integrated photosensitive device. When the screen is in contact, light is blocked and this blockage is detected by the photosensitive device inside the LCD module. The issue with this approach is that scattered light in the environment can cause false or missed touches. Another loss is that light transmission can be reduced by photosensitive elements located within each pixel. This decreases unit brightness.

The above invention utilizes resistive or photosensitive contacts to detect contact locations. These contacts have some inherent issues. As a result, it is necessary to use a new design that is not impacted by scattered light in the environment. It is also required to use a design in which no contact is caused by the connection of the two conductive layers.

 Here, the capacitive touch screen is integrated within the LCD panel to eliminate the disadvantages and the risks associated with the previous method. The embodiment discussed below resolves the issues that the remaining approach had previously. When the following detailed description of the invention is observed, it will be clear how to solve it in a new way.

2 shows a display panel having a contact circuit according to the present invention. The display panel includes an upper polarizer 21, a lower polarizer 21, a lower glass substrate 22 provided on the lower polarizer 21, an upper glass substrate 22 provided below the upper polarizer 21, and an upper transparent ITO layer 23. ) Is provided in the upper glass substrate 22 and the lower transparent ITO layer 23 is sandwiched between the transparent ITO layer 23 and the transparent ITO layer 23 having two spaces provided in the lower glass substrate 22. A liquid crystal layer 24, a contact circuit layer 25 sandwiched between the upper polarizer 21 and an upper glass substrate 22 over the liquid crystal layer 24. By configuring as above, the contact circuit layer 25 is installed in the display panel rather than externally, resulting in a reduction in manufacturing cost, assembly cost and assembly time.

Referring to FIG. 3 with respect to FIG. 2, in a lower embodiment the contact circuit layer 25 is sandwiched between the upper polarizer 21 and the upper glass substrate 22. The contact circuit layer 25 has a plurality of coating circuits 250 formed over the upper glass substrate 22 facing the upper polarizer 21. The coating circuit 250 is implemented as an LCD transparent circuit. As a result, this not only saves the material for producing the transparent ITO glass and the transparent ITO film for the contact circuit, but also saves the assembly time of the separately manufactured contact panel and display panel as experienced in the prior art.

Referring to FIG. 4 in conjunction with FIG. 2, in a further embodiment contact circuit layer 25 is over liquid crystal layer 24 and between upper polarizer 21 and upper glass substrate 22 (see FIG. 2). It is stuck. Alternatively, the contact circuit layer 25 is under the liquid crystal layer 24 and sandwiched between the lower polarizer 21 and the lower glass substrate 22 (see FIG. 4).

5, there is shown another display panel with a contact circuit according to the present invention. This display panel is provided on the intermediate liquid crystal layer 24, the upper transparent ITO layer 23 provided in the liquid crystal layer 24, the lower transparent ITO layer 23 provided under the liquid crystal layer 24, and the upper transparent ITO layer 23. Provided under the provided upper glass substrate 22, under the lower transparent ITO layer 23, provided under the upper transparent ITO layer 23, the upper polarizer 21 provided above the lower transparent ITO layer 23, and The lower polarizer 21 is provided. In the display panel further provided upper connection circuit layer 25 sandwiched between the upper polarizer 21 and the upper glass substrate 22 and lower connection circuit layer 25 sandwiched between the lower polarizer 21 and the lower glass substrate 22. There is this. These connection circuit layers 25 leave spaces from the top and bottom surfaces of the liquid crystal layer 24, respectively. By the above configuration, the contact circuit layer 25 is installed in the display panel. As a result, this not only saves the materials for manufacturing transparent ITO glass and transparent ITO film for contact circuits as experienced in the prior art, but also saves assembly costs.

Referring to FIG. 8 in conjunction with FIG. 5, in a third, lower embodiment, the upper contact circuit layer 25 is sandwiched between the upper polarizer 21 and the upper glass substrate 22 and the lower contact circuit layer 25. Is sandwiched between the lower polarizer 21 and the lower glass substrate 22. The top contact circuit layer 25 has a number of coating circuits 250 forming on its top surface over the top glass substrate 22 facing the top polarizer 21. This coating circuit 250 is implemented as an LCD transparent circuit.

Referring to FIG. 6 with respect to FIG. 5, in the first lower embodiment each contact circuit layer 25 is formed by the top of which the coating circuit 250 of the upper contact circuit layer 25 faces the upper polarizer 21. A plurality formed on the upper surface thereof arranged on the glass substrate 22 and the coating circuit 250 of the lower contact circuit layer 25 arranged below the lower glass substrate 22 facing the lower polarizer 21. The coating circuit 250 is provided.

Referring to FIG. 7 in conjunction with FIG. 5, the orientation of the coating circuit 25 in the upper contact circuit layer 25 in the second, lower embodiment is the coating circuit 250 of the lower contact circuit layer 25. Right angle). By configuring as above each contact circuit layer 25 is sandwiched between them by corresponding polarizer 21 and glass substrate 22 to remove additional contact panels. As a result, this not only saves the assembly time of the display panel and the contact panel, but also saves the material for producing the transparent ITO glass and the transparent ITO film for the contact circuit as experienced in the prior art. Moreover this reduces the manufacturing cost.

 While this invention disclosed herein is described as a means of particular embodiments, many modifications and variations can be made by skill in the work without departing from the spirit and scope of the invention as set forth in the claims.

Claims (9)

As a display panel, An upper polarizer; Bottom polarizer; A bottom glass substrate provided over the bottom polarizer; A lower glass substrate provided below the upper polarizer; An upper transparent ITO layer provided under the upper glass substrate; A bottom transparent ITO layer provided over the bottom glass substrate; An intermediate liquid crystal layer sandwiched between transparent ITO layers; And A display panel sandwiched between an upper polarizer and an upper glass substrate and having a touching circuit layer disposed over the liquid crystal layer. The method of claim 1, And a contact circuit layer having a plurality of coating circuits formed over the upper glass substrate facing the upper polarizer. The method of claim 1, The display circuit layer is provided over the liquid crystal layer and sandwiched between the upper polarizer and the upper glass substrate. The method of claim 1, A display panel provided under the liquid crystal layer and sandwiched between the lower polarizer and the lower glass substrate. As a display panel, Top polarizer; Bottom polarizer; A bottom glass substrate provided over the bottom polarizer; An upper glass substrate provided below the upper polarizer; An upper transparent ITO layer provided below the upper glass substrate; A bottom transparent ITO layer provided over the bottom glass substrate; An intermediate liquid crystal layer sandwiched between transparent ITO layers; An upper contact circuit layer sandwiched between the upper polarizer and the upper glass substrate; A bottom contact circuit layer sandwiched between the bottom polarization field and the bottom glass substrate; And a top and bottom contact circuit layer spaced from the top and bottom surfaces of the liquid crystal layer, respectively. The method of claim 5, And wherein the top contact circuit layer has a plurality of coating circuits formed on its top surface over the top glass substrate facing the top polarizer. The method of claim 5, Each top and bottom contact circuit layer is arranged with a plurality of coating circuits formed on its top surface, a coating circuit of the top contact circuit arranged over the top glass substrate facing the top polarizer and a bottom glass substrate facing the bottom polarizer. A display panel having a coating circuit of a lower contact circuit. The method of claim 7, wherein A display panel in which the orientation of the coating circuit in the upper contact circuit layer is perpendicular to the coating circuit in the lower contact circuit layer. The method of claim 8, A display panel in which the direction of the coating circuit in the upper contact circuit layer is the same as the coating circuit in the lower contact circuit layer.

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