CN101900905A - Touch control type liquid crystal display - Google Patents

Abstract

A touch-controlled liquid crystal display comprises: a liquid crystal display panel, comprising: a first polarizer; a thin film field effect transistor array, arranged on the polarizer; a color filter, arranged on the polarizer; a second polarizer, arranged on the color filter; and a phase delay plate, arranged on the second polarizer; and a touch panel, arranged opposite to the liquid crystal display panel, comprising: a circular polarizer, arranged opposite to the liquid crystal display panel; and a conductive glass layer, arranged on the circular polarizer; wherein an air gap is formed between the touch panel and the liquid crystal display panel. The touch-controlled liquid crystal display of the present invention can eliminate reflected light and improve the quality of the touch-controlled liquid crystal display.

Description

Touch LCD

technical field

The invention relates to a liquid crystal display, and in particular to a touch-sensitive liquid crystal display.

Background technique

At present, with the development of display technology, touch-type thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display; TFTLCD) is commonly used as a display device in various electronic products. Please refer to shown in Fig. 1, the traditional touch TFT LCD structure mainly comprises liquid crystal panel 10 and touch panel 30, and wherein liquid crystal panel comprises first polarizer 11; Thin film field effect transistor array 12, is arranged on described first polarization The color filter 14 is arranged on the first polarizer 11 ; the second polarizer 16 is arranged on the color filter 14 . The touch panel 30 includes a protective film 31 and a conductive glass 32 formed on the conductive glass 32 .

Generally, in the manufacturing process of TFT LCD, there is often an air gap (air gap; AP) 20 between the liquid crystal panel 10 and the touch panel 30. The reflectivity of the interface, and the reflectivity of the interface between the air in the air gap 20 and the second polarizer 16 will cause the reflected light to be too strong due to the large difference in the reflectivity of the medium, and will cause the picture quality of the liquid crystal display to decrease. . In order to solve the above problems, some manufacturers of touch-sensitive liquid crystal displays use optical glue to bond the liquid crystal panel 10 and the touch panel 30, thus, the air gap between the liquid crystal panel 10 and the touch panel 30 becomes optical glue, and The interface reflectivity between the protective film 31 and the optical glue, and the interface reflectivity between the optical glue and the second polarizer 16 will be greatly reduced due to the difference in the refractive index of the medium, thereby reducing the reflection of external light (environmental light) and increasing the Light efficiency of TFT LCD. However, bonding the liquid crystal panel 10 and the touch panel 30 with optical glue may lead to lower product yield and higher manufacturing cost due to process reasons in the actual production process, and it is not easy to rework when the product has a problem.

Therefore, it is necessary to propose a new touch-sensitive liquid crystal display, which can effectively improve the light efficiency, has a simple and convenient manufacturing process, and is suitable for actual production.

Contents of the invention

Therefore, the present invention is to provide a touch-sensitive liquid crystal display, which can effectively reduce the problem that the reflected light of the touch-sensitive liquid crystal display is too strong.

According to one aspect of the present invention, a touch-sensitive liquid crystal display is provided, including: a liquid crystal display panel, including: a first polarizer; a thin film field effect transistor array, arranged on the polarizer; a color filter, set on the polarizer; a second polarizer, set on the color filter; and a phase retarder, set on the second polarizer; and a touch panel, and the liquid crystal The display panel is arranged oppositely, including: a circular polarizer, arranged opposite to the liquid crystal display panel; and a conductive glass layer, arranged on the circular polarizer; wherein a touch panel and the liquid crystal display panel are further formed air gap.

With the touch-type liquid crystal display of the present invention, the reflected light of the incident light can be absorbed by the circular polarizer, and the polarization state of the light can be converted by the phase retarder, thereby effectively reducing the generation of reflected light.

Description of drawings

In order to make the above objects and other features, advantages and embodiments of the present invention more obvious and understandable, the detailed description of the accompanying drawings is as follows:

FIG. 1 is a schematic structural diagram of an existing touch-sensitive liquid crystal display;

FIG. 2 is a schematic structural diagram of a touch-sensitive liquid crystal display according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of incident light polarization of the touch-sensitive liquid crystal display shown in FIG. 2; and

FIG. 4 is a schematic diagram of light polarization of the touch-sensitive liquid crystal display shown in FIG. 2 .

[Description of main component symbols]

10: TFT liquid crystal display panel 20: Air gap

11: The first polarizer 30: Touch panel

12: Thin Film Field Effect Transistor Array 31: Protective Film

14: Color filter 32: Conductive glass

16: Second polarizer 33: Circular polarizer

18: Phase delay film

Detailed ways

The embodiments of the present invention will be clearly explained below with the accompanying drawings and detailed description. For the sake of simplifying the accompanying drawings, some known and commonly used structures and components will be shown in a simple and schematic manner in the accompanying drawings. Likewise, for the sake of simplification of description, in the drawings of the present invention, the same reference numerals denote the same elements unless otherwise specified. However, it should be noted that the above-mentioned practice is only for the purpose of exemplifying and illustrating the specific implementation of the present invention, and should not be construed as any limitation to the present invention.

Please refer to FIG. 2 , which is a schematic structural diagram of a touch-sensitive liquid crystal display according to an embodiment of the present invention. The touch-sensitive LCD shown in FIG. 2 includes a Thin Film Transistor Liquid Crystal Display (TFT LCD) 10 and a touch panel 30 . In this embodiment, the touch panel 30 includes a conductive glass 32 and a circular polarizer 33 . Wherein the conductive glass 32 is generally composed of transparent conductive materials. In this embodiment, the conductive glass 32 is indium tin oxide (commonly known as ITO) glass, usually on the basis of soda-calcium-based or silicon-boron-based substrate glass. It is manufactured by coating a layer of film by magnetron sputtering. In addition, a circular polarizing plate 33 is formed on one side of the conductive glass 32, opposite to the TFT LCD. In this embodiment, the circular polarizer 33 is used to deflect the incident path of the incident light and generate circularly polarized light.

In this embodiment, the TFT LCD 10 includes a first polarizer 11, a thin film field effect transistor array 12, a color filter 14, a second polarizer 16 and a phase retarder 18. Wherein the first polarizer 11 is a linear polarizer, which can convert incident light, composite light, or monochromatic light into linearly polarized light, and then pass through the polarizer to extinction. The thin film field effect transistor array 12 is disposed on the first polarizer 11 . The color filter 14 is disposed on the TFT array 12 . The second polarizer 16 is placed on the color filter 14 . In this embodiment, the first polarizer 11 and the second polarizer 16 are linear polarizers, which can convert incident light into linearly polarized light. A phase retarder 18 is disposed on the second polarizer 16. In this embodiment, the phase retarder 18 is a λ/4 phase retarder and is disposed facing the touch panel 30,

Please refer to FIG. 2 further, there is an air gap 20 between the TFT LCD 10 and the touch panel 30. This is because in the traditional manufacturing process, the TFT LCD 10 and the touch panel 30 are manufactured separately and then combined. In this way, when the light is incident, the air gap 20 will affect the incident light due to the refractive index of the air.

Please refer to FIG. 3 , which is a schematic diagram of incident light deflection of the touch-sensitive liquid crystal display shown in FIG. 2 . As shown in Figure 3, when external light (environmental light) (referring to shown in the line with arrows) is incident on the TFT LCD 10 through the conductive glass layer 32, when passing through the circular polarizer 33, a circle is formed. Polarized light. In this embodiment, the circularly polarized light is a clockwise polarized circularly polarized light. At the same time, when the clockwise polarized circularly polarized light is reflected at the interface between the circular polarizer 33 and the air gap 20, it forms reversed circularly polarized light. In this embodiment, the reversed circularly polarized light It is circularly polarized light polarized counterclockwise, and the reverse circularly polarized light deflected counterclockwise can be absorbed by the circular polarizer 33 at this time.

Please refer to Fig. 3 further, when external light (environmental light) is incident to described TFT LCD 10 by described conductive glass layer 32, when passing through described circular polarizer 33, form circularly polarized light, in the present embodiment, The circularly polarized light is clockwise polarized circularly polarized light. At the same time, when the clockwise polarized circularly polarized light passes through the circular polarizer 33, reaches the interface between the air gap 20 and the λ/4 phase retarder 18, and is reflected, it also forms a reverse circularly polarized light, in this embodiment, the reversed circularly polarized light is circularly polarized light counterclockwise, and the reversed circularly polarized light is also absorbed by the circular polarizer 33 at this time.

In this embodiment, thus, when external light (ambient light) is incident through the conductive glass 32, the external light (ambient light) will not cause contrast due to reflection in the touch-sensitive liquid crystal display. increase.

Please refer to FIG. 4 , which is a schematic diagram of incident light deflection of the touch-sensitive liquid crystal display shown in FIG. 2 . In this embodiment, when the incident light (the picture light of the TFT LCD) is incident from the backlight of the TFT LCD 10, the incident light reaches the second polarizer 16. The incident light forms linearly polarized light at the second polarizer 16, and the linearly polarized light is converted into circularly polarized light through the λ/4 phase retarder 18. In this embodiment, the circularly polarized light is circularly polarized light polarized clockwise. The clockwise polarized circularly polarized light can pass through the air gap 20 and the circular polarizer 33 , and reach the conductive glass 32 . At this time, the clockwise polarized circularly polarized light is converted into linearly polarized light when passing through the conductive glass 32 . As a result, the picture light of the TFT LCD can smoothly reach the surface of the touch-sensitive liquid crystal display.

The touch-type liquid crystal display of the present invention absorbs and eliminates external incident light through the circular polarizer, and passes through the picture light of the liquid crystal display panel through the λ/4 phase retarder and the linear polarizer, thereby effectively improving the Describe the quality of the touch LCD display. Moreover, the touch-type liquid crystal display of the present invention can avoid the use of optical glue to eliminate the air gap in the touch-type liquid crystal display, reduces difficulties in the manufacturing process, and is suitable for actual production.

Although the content of the present invention has been disclosed above in terms of implementation, it is not intended to limit the content of the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the content of the present invention. Therefore, the protection scope of the content of the present invention should be determined by the scope defined in the claims.

Claims (6)

1. A touch-sensitive liquid crystal display, characterized in that, the touch-sensitive liquid crystal display comprises: a liquid crystal display panel, comprising: first polarizer; A thin film field effect transistor array is arranged on the polarizer; A color filter is arranged on the polarizer; a second polarizer disposed on the color filter; and A phase retarder, arranged on the second polarizer; and a touch panel, arranged opposite to the liquid crystal display panel, including: a circular polarizer, set opposite to the liquid crystal display panel; and The conductive glass layer is arranged on the circular polarizer; wherein an air gap is formed between the touch panel and the liquid crystal display panel. 2 . The touch-sensitive liquid crystal display according to claim 1 , wherein the phase retarder is a λ/4 phase retarder. 3 . The touch-sensitive liquid crystal display according to claim 1 , wherein the first polarizer and the second polarizer are linear polarizers. 4 . 4. The touch-sensitive liquid crystal display according to claim 2, wherein the circular polarizer is used to convert an external incident light into a first circularly deflected light. 5. The touch-sensitive liquid crystal display according to claim 4, wherein the λ/4 phase retarder is used to reflect the first circularly deflected light, so that the first circularly deflected light is converted into a second circularly deflected light Two circularly deflected lights, the deflection direction of the second circularly deflected light is opposite to that of the first circularly deflected light. 6 . The touch-sensitive liquid crystal display according to claim 5 , wherein the circular polarizer is also used to absorb the second circularly deflected light.

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