CN1199081C - Touch LCD panel device - Google Patents

Abstract

A touch type liquid crystal panel device includes a first transparent substrate; a second transparent substrate opposite to the first transparent substrate but spaced apart from the transparent first substrate; a liquid crystal material layer sandwiched between the first and second transparent substrates; a touch panel disposed on the second transparent substrate; a first polarizer arranged on the surface of the first transparent substrate opposite to the second transparent substrate; and a circular polarized light plate arranged on the surface of the touch mode panel opposite to the second transparent base electrode. The invention utilizes the circular polarized light sheet to achieve the anti-reflection effect so as to increase the light contrast on the touch panel, and does not need to use a high-cost anti-reflection film.

Description

Touch LCD panel device

technical field

The present invention relates to a liquid crystal panel device, in particular to a touch-type liquid crystal panel device, which utilizes a circular polarizer to achieve anti-reflection effect to obtain high contrast of the panel without using high-cost anti-reflection film.

Background technique

With the advancement of electronic technology, especially the prevalence of portable electronic products in daily life, the demand for thin, light, small and low power consumption displays is increasing day by day. Liquid Crystal Display (LCD) is often used in such electronic products due to its advantages of low power consumption, low heat generation, light weight, and non-luminous displays, and has even gradually replaced traditional cathodes. Ray tube monitor.

The manufacturing process of a liquid crystal display unit (LCD Cell) generally includes making a thin film transistor (TFT) on a transparent glass with a semiconductor manufacturing process, attaching a transparent electrode, and then making a filter with another piece of transparent glass, attaching Transparent electrodes, and then set alignment films on the two transparent glasses, inject liquid crystal material into the two flat glasses with transparent electrodes and seal them, and paste polarizers (polarizing films) on the outside, thus completing the liquid crystal display unit. Then add drive circuit, control circuit, backlight and other components to complete the LCD Module.

Fig. 1 is a sectional view of a liquid crystal display unit (LCD Cell), the liquid crystal display unit basically is made up of a first transparent substrate 21, a second transparent substrate 22, a first polarizer (Polarizer) 9, a first Two polarizers 8 and a liquid crystal material 1 are formed. The first transparent substrate 21 mainly includes a glass substrate 5, a transparent conductive electrode 7, an alignment film 3 and electronic components thereon; the second transparent substrate 22 mainly includes a glass substrate 4, a transparent conductive electrode 6, a Orientation film 2 and the optical elements on it. The transparent conductive electrodes 6 and 7 are vacuum plated with a conductive metal oxide film on the surface of high-quality flat glass. The first polarizer 9 and the second polarizer 8 are formed by sandwiching polarizing material between two transparent films, and the first polarizer 9 and the second polarizer 8 are arranged on the liquid crystal display unit On the surface of the polarizer, when any polarized or unpolarized light passes through the polarizer, the linearly polarized light in a specific direction continues on. The polarizer is a key component in the manufacture of liquid crystal displays. It is a light-receiving display element, so it needs to have special optical properties. See through and protect the characteristics of liquid crystal materials. Generally speaking, the polarization directions of the first polarizer 8 and the second polarizer 9 are linear and perpendicular.

Referring to Fig. 1 again, the display principle of the liquid crystal display is explained. The principle of liquid crystal display takes twisted nematic liquid crystal (Twisted nematic, TN) as an example. A liquid crystal material 1 is sealed in the gap between two transparent conductive electrodes 6 and 7. When no voltage is applied, the liquid crystal molecules are Under the influence of the alignment films 2 and 3 (generally polymer nylon films) on the transparent electrodes, they are arranged in a certain direction and twisted 90 degrees between the upper and lower transparent electrodes 6 and 7 . In general, horizontal polarization and vertical polarization can be used as two independent polarizations, and any polarization of light can be expressed as a combination of these two polarizations. The linearly polarized light passing through the first polarizer 9 enters the liquid crystal material 1, rotates the direction of linear polarization in the liquid crystal material layer 1 along the twist of the liquid crystal molecules, and passes through the second polarizer after being twisted 90 degrees. 8 and shine. The overall transmittance of light at this time is about 16%.

When a voltage is applied to the upper and lower transparent electrodes 6 and 7 , the orientation of the liquid crystal molecules in the liquid crystal material layer 1 is affected by the electric field and is parallel to the direction of the electric field. Therefore, the linearly polarized light passing through the first polarizer 9 is incident on the liquid crystal material layer 1, and the direction of the liquid crystal molecules along the liquid crystal material layer 1 is not rotated, so the first polarized light cannot pass through the liquid crystal material layer 1. Sheet 9 is perpendicular to the second polarizing sheet 8 . In short, the liquid crystal display unit relies on the electric field generated between the electrodes to drive the liquid crystal material to control the transmission of the light source, and through the polarizer, the ordinary light becomes polarized light with a precisely controlled direction, thereby displaying images. It can be seen from the description that the liquid crystal display unit includes at least two polarizers, wherein the polarizers are linear polarizers.

The touch panel (Touch Panel) is a direct interaction between man and machine. It is not only used in general products, but especially in portable products. It has the advantages of light weight and small size. Input, making portable products more portable convenience. Therefore, the market demand for related products of the touch panel grows rapidly. Its products include Communication equipment, Household appliance, Entertainment appliance, IA product, Medical Instruments, etc.

Referring to Fig. 2 and Fig. 3, the structure of the touch panel is illustrated. The touch panel 23 is bonded on the second transparent substrate 22 of the liquid crystal display unit. The touch panel 23 is composed of two upper and lower transparent electrode plates (ITO films) 11 and 12 and two upper and lower resistive films 13 and 14. The coordinate sensing method is equivalent to stacking the upper and lower sets of potentiometers. When pressure is applied to make the upper and lower films contact, if an additional voltage is applied to the upper electrode plate 11, the potential of the touch point will be detected by the lower electrode plate 2, and vice versa. However, the coordinate value can be obtained further. Generally speaking, the transparent electrode plate 11 will reflect ambient light and be confused with the transmitted light from the liquid crystal display unit, thereby reducing the contrast. Therefore, if no anti-reflection is provided, clear and bright images cannot be obtained. Traditional methods An anti-reflection film 15 (as shown in Figure 2) or a circular polarizer 16 (Circular polarizer) (as shown in Figure 3) is usually added to prevent reflection.

See FIG. 2 for a conventional touch panel structure. An antireflection film 15 is provided on the transparent electrode plate 11 of the touch panel. The purpose of this anti-reflection film 15 has two: one is to reduce reflection and increase the transmittance of the whole optical system, and the other is to improve the clarity of the image of the optical system, because if there is no anti-reflection film, the incident light will be in the system. Reflections back and forth between various interfaces cause a lot of stray light or glare. The anti-reflection film 15 uses the principle of light wave interference to coat a thin film on the surface of the transparent electrode plate 11, the thickness is the optical thickness of 1/4 wavelength, so that the light is no longer only reflected by the interface of glass and air, but by The two interfaces of air and thin film, thin film and glass are reflected, so interference phenomenon occurs, so that the reflected light decreases. If two layers of anti-reflective coating are applied, the reflectivity will be lower. But coating one or two layers has disadvantages: the pass band of low reflectivity is not wide enough to achieve low reflectivity in the visible light range. Therefore, a multi-layer anti-reflection film is used, such as an optical thickness of 1/4-1/2-1/4 wavelength, as a three-layer anti-reflection film to obtain an anti-reflection film with broadband and low reflectivity. However, if it is necessary to have a very high reflectivity for a certain wavelength of light, it is necessary to repeatedly vapor-deposit dozens of layers of materials with different refractive indices to achieve this effect.

See FIG. 3 for another conventional touch panel structure. A circular polarizer 16 is arranged on the transparent electrode plate 11 of the touch panel for anti-reflection. The principle is as follows: Generally speaking, light can use right-handed circular polarization and left-handed circular polarization as two independent polarizations, and any polarization of light can represent a combination of two polarizations . Assuming that the circularly polarized light plate 16 is a circularly polarized light plate with right-handed circularly polarized polarization, when the ambient light is incident on the circularly polarized light plate 16, the left-handed circularly polarized light is absorbed, while the right-handed circularly polarized light is absorbed. Light penetration, when the right-handed circularly polarized light encounters the transparent electrode plate 1 and is reflected, the right-handed circularly polarized light becomes left-handed circularly polarized light due to a phase shift of 180 degrees, and the left-handed circularly polarized light When the light encounters the circular polarizer 16 with right-handed circular polarization again, it is absorbed, so the ambient light is not reflected, thus obtaining a display unit with increased contrast and a touch panel 23 . Since the touch panel is mainly composed of upper and lower transparent electrode plates 11 and 12 and resistive films 13 and 14, the transparent electrode plates 11 and 12 will reflect ambient light and cause a decrease in contrast. Therefore, in the traditional way, an anti-reflection film 15 or a circular polarizer 16 is added to prevent reflection, so as to achieve a clear, bright and high-contrast image. However, no matter adding an anti-reflection film 15 or a circular polarizer 16, it will increase the manufacturing cost and complicate the manufacturing process.

In view of this, it is necessary to provide a touch-type liquid crystal panel structure, which uses a circular polarizer to achieve an anti-reflection effect to increase the contrast of the panel, and can reduce a polarizer or an anti-reflection film and a polarized light. The arrangement of the chips can achieve the advantage of reducing the manufacturing cost.

Contents of the invention

The main purpose of the present invention is to provide a touch-type liquid crystal panel device, which utilizes a circular polarizer to achieve an anti-reflection effect to increase the light contrast on the touch-type panel without using a high-cost anti-reflection film.

Another object of the present invention is to provide a touch-type liquid crystal panel device, which uses a circular polarizer to achieve an anti-reflection effect, thereby reducing the setting of a circular polarizer or an anti-reflection film, and reducing production costs. advantage.

In order to achieve the above-mentioned purpose of the present invention, the touch-type liquid crystal panel device utilizes a circular polarizer to achieve an anti-reflection effect, and the touch-type liquid crystal panel device includes a first transparent substrate; a second transparent substrate, and the first The transparent substrate is opposite, but separated from the transparent first substrate; a layer of liquid crystal material is sandwiched between the first and second transparent substrate; a touch panel is arranged on the second transparent substrate; a first polarization A light sheet is arranged on the surface opposite to the second transparent substrate of the first transparent substrate; and a circular polarizing sheet is arranged on the surface of the touch panel opposite to the second transparent substrate, wherein the first The polarizer is a circular polarizer or a linear polarizer.

According to another preferred embodiment of the present invention, the touch-type liquid crystal panel device includes a first transparent substrate; a second transparent substrate, opposite to the first transparent substrate, but separated from the transparent first substrate; A liquid crystal material layer is sandwiched between the first and second transparent substrates; a touch panel is arranged on the second transparent substrate; a circular polarizer is arranged on the first transparent substrate and the second transparent substrate on the opposite surface of the substrate; and a linear polarizer arranged on the opposite surface of the touch panel and the second transparent substrate.

The touch-type liquid crystal panel device of the present invention uses a circularly polarized light plate as a polarized light plate, and at the same time achieves an anti-reflection effect, so that high contrast can be obtained. More particularly, with this structure, the touch panel can reduce the arrangement of a polarizer or an anti-reflection film and a polarizer, thereby achieving the advantage of reducing production costs.

In order to make the above and other objects, features and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a sectional view of a conventional liquid crystal display device.

FIG. 2 is a sectional view of a conventional touch panel.

FIG. 3 is a sectional view of a conventional touch panel.

4 is a cross-sectional view of a first embodiment of a touch-type liquid crystal panel device according to the present invention.

5 is a cross-sectional view of a second embodiment of a touch-type liquid crystal panel device according to the present invention.

Explanation of reference signs:

1 layer of liquid crystal material

2 oriented film 3 oriented film

4 Glass substrate 5 Glass substrate

6 transparent electrodes 7 transparent electrodes

8 second polarizer 9 first polarizer

9' first polarizer

10 liquid crystal display unit

11 Transparent electrode plate 12 Transparent electrode plate

13 Impedance film 14 Impedance film

15 Anti-reflection film 16 Circular polarizer

17 second polarizer 41 color filter

51 thin film transistor circuit

Examples

Referring to FIG. 4 , it shows a first embodiment of a touch-type liquid crystal panel device according to the present invention. The touch-type liquid crystal panel device is generally composed of a liquid crystal display unit 10 and a touch-type panel 23 .

The liquid crystal display unit 10 is basically composed of a first transparent substrate 21, a second transparent substrate 22, a first polarizer 9', and a liquid crystal material 1, wherein the first transparent substrate 21 mainly includes a glass The substrate 5 has a plurality of thin film transistor circuits 51 arranged on the surface of the glass substrate 5, a transparent conductive electrode 7 is arranged on the thin film transistor circuit 51, and an orientation film 3 is arranged on the transparent conductive electrode 7, As well as the electronic components on it, the second transparent substrate 22 mainly includes a glass substrate 4 with a plurality of color filters 41, a transparent conductive electrode 6, an alignment film 2 and optical components thereon. The transparent conductive electrodes 6 and 7 are vacuum plated with a conductive metal oxide film on the surface of high-quality flat glass.

The touch panel 23 is bonded to the second transparent substrate 22 of the liquid crystal display unit. The touch panel 23 is composed of upper and lower transparent electrodes 11 and 12 , upper and lower resistive films 13 and 14 and a second polarizer 17 . Both the first polarizer 9' and the second polarizer 17 are circular polarizers, and the circular polarizer 9' is arranged on the surface of the first substrate 21 of the liquid crystal display unit 10, and the second polarizer The light sheet 17 is disposed on the surface of a transparent electrode 11 of the touch panel 23 .

Referring to FIG. 4 , the display principle of the touch-type liquid crystal panel device of the present invention is illustrated. The principle of liquid crystal display is to take twisted nematic liquid crystal as an example. A liquid crystal material 1 is sealed in the gap between two transparent electrodes 6 and 7. When no voltage is applied, the liquid crystal molecules are oriented by the orientation film on the transparent electrode. The effects of 2 and 3 are arranged in a certain direction, and twisted 90 degrees between the upper and lower transparent electrodes 6 and 7. The present invention uses right-handed circular polarization and left-handed circular polarization as two independent polarizations, and any light polarization can be expressed as a combination of these two polarizations. After the light passes through the first polarizer 9', it appears that circular polarized light is incident on the liquid crystal material 1, and the polarization direction is rotated in the liquid crystal material layer 1 along the twisting of the liquid crystal molecules, and the light is caused by the material itself. The phase difference makes the light be elliptical polarized light (Elliptical polarized light) before reaching the second polarizer 17, and after passing through the second polarizer 17, the elliptical polarized light is partially absorbed and partially transmitted to emit light.

When a voltage is applied to the upper and lower transparent electrodes 6 and 7, the orientation of the liquid crystal molecules is affected by the electric field and is parallel to the direction of the electric field. After the light passes through the first polarizer 9', the circularly polarized light is incident on the liquid crystal material layer 1, and the circularly polarized direction is not rotated along the direction of the liquid crystal molecules, because the optical rotation direction of the second polarizer 17 is Contrary to each polarizer 9 ′, the circularly polarized light reaching the second polarizer 17 cannot pass through the second polarizer 17 . In short, one of the functions of the second polarizer 17 is to cooperate with the first polarizer 9' to pass through the polarizer to convert ordinary light into polarized light with a precisely controlled direction, so as to control the transmission of the light source. , to display the image.

Another function of the second polarizer 17 is anti-reflection. Since the touch panel is composed of transparent electrode plates, the transparent electrode plate 11 will reflect ambient light and be confused with the penetrating light from the liquid crystal display unit, resulting in a decrease in contrast. Therefore, if no anti-reflection is applied, a clear display cannot be obtained. Bright image. The anti-reflection principle of the second polarizer 17 is as follows:

Assuming that the second polarizer 17 is a circular polarizer with right-handed circular polarization, when ambient light is incident on the second polarizer 17, the left-handed circularly polarized light is absorbed, while the right-handed circularly polarized The polarized light penetrates, and when the right-handed circularly polarized light encounters the transparent electrode plate 11 and is reflected, the right-handed circularly polarized light becomes left-handed circularly polarized due to a phase shift of 180 degrees, and the left-handed circularly polarized light When the light encounters the second polarizer 17 with right-handed circular polarization again, it is absorbed, so the ambient light is not reflected and the contrast is increased. In this way, compared with the prior art, the touch-type liquid crystal panel structure of the present invention does not have a polarizer 8 on the second transparent substrate 22 , and does not need to use the high-cost anti-reflection film 15 .

Referring to FIG. 5, it shows a second embodiment of the touch-type liquid crystal panel device according to the present invention. The touch-type liquid crystal panel device is generally similar to the touch-type liquid crystal panel device of the first embodiment of the present invention, but the first polarizer 9 is a linear polarizer and the second polarizer 17 is a circular polarizer. Polarizer. The display principle of the touch-type liquid crystal panel of the present invention takes twisted nematic liquid crystal as an example. In the case of no voltage applied, the liquid crystal molecules of the liquid crystal material layer 1 are affected by the alignment films 2 and 3 on the transparent electrodes, and move toward Arranged in a certain direction, and twisted 90 degrees between the upper and lower transparent electrodes 6 and 7 . After the light passes through the first polarizer 9, the linearly polarized light is incident on the liquid crystal material layer 1, and the twisting of the liquid crystal molecules along the liquid crystal material layer 1 rotates the linear polarization direction in the liquid crystal material layer 1, because the material itself The phase difference of the light is caused, so that the light is linearly polarized before reaching the second polarizer 17 , and after passing through the second polarizer 17 , part of the linearly polarized light is absorbed and partly passes through to emit light.

When a voltage is applied to the upper and lower transparent electrodes 6 and 7, the orientation of the liquid crystal molecules is affected by the electric field and is parallel to the direction of the electric field. After the light passes through the first polarizer 9, it appears that the linearly polarized light is incident on the liquid crystal material layer 1, along the direction of the liquid crystal molecules without rotating the direction of the linearly polarized light, so that the light is still linear before reaching the second polarizer 17 Polarized light, since the second polarizer is a circular polarizer, the linearly polarized light reaching the second polarizer 17 cannot pass through the second polarizer 17. In short, one of the functions of the second polarizer 17 is to cooperate with the first polarizer 9 to pass through the polarizer to convert ordinary light into polarized light with a precisely controlled direction, so as to control the transmission of the light source. Then display the image.

Another function of the second polarizer 17 is anti-reflection. The anti-reflection principle of the second polarizer 17 is as described in the first embodiment of the present invention, and will not be repeated here. In this way, compared with the prior art, the structure of the touch liquid crystal panel of the present invention does not have a polarizer 8 on the second transparent substrate 22 , and does not need to use the high-cost anti-reflection film 15 .

According to the touch-type liquid crystal panel device of the present invention, at least one circular polarizer is used to achieve an anti-reflection effect, so as to increase the light contrast on the touch panel, and thus reduce a circular polarizer and an anti-reflection film, or The arrangement of a linear polarizer can achieve the advantage of reducing the manufacturing cost.

Although the foregoing description and accompanying drawings have shown preferred embodiments of the present invention, it must be understood that various additions, modifications and substitutions may be applied to the preferred embodiments of the present invention without departing from the scope of the appended claims. The spirit and scope of the principles of the invention are defined. Those skilled in the art will appreciate that the present invention is possible with many modifications in form, structure, arrangement, proportion, material, element and assembly. Therefore, all viewpoints of the embodiments described herein should be regarded as illustrating the present invention rather than limiting the present invention. The scope of the present invention should be defined by the appended claims, including legal equivalents thereof, and not limited by the foregoing description.

Claims (5)

1. touch-typed LCD panel device comprises:

One first transparency carrier;

One second transparency carrier, relative with this first transparency carrier, but be separated by with this transparent first substrate;

A liquid crystal material layer is clipped between this first and second transparency carrier;

A contact type panel is located on this second transparency carrier;

One first polarized light piece is located under this first transparency carrier; And

A circularly polarizing plate is located on this contact type panel.

2. touch-typed LCD panel device according to claim 1 is characterized in that, this first polarized light piece is a circularly polarizing plate.

3. touch-typed LCD panel device according to claim 1 is characterized in that, this first polarized light piece is a linear polarization mating plate.

4. touch-typed LCD panel device according to claim 1 is characterized in that, this first transparency carrier comprises:

A glass substrate;

A membrane transistor circuit is arranged on the surface of this glass substrate;

A transparency conductive electrode is located on this membrane transistor circuit; And

An oriented film is located on this transparency conductive electrode.

5. touch-typed LCD panel device according to claim 1 is characterized in that, this second transparency carrier comprises:

A glass substrate;

A chromatic filter is arranged on this glass substrate;

A transparency conductive electrode is located on this chromatic filter; And

An oriented film is located on this transparency conductive electrode.

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