CN105929580A - Resistive touch display device - Google Patents

Abstract

The present invention relates to a resistive touch display device, comprising a first substrate, a second substrate, a third substrate and a backlight module arranged in sequence, and a liquid crystal layer surrounded between the first substrate and the second substrate. The third substrate is located between the second substrate and the backlight module, the second substrate has an opposite first surface and a second surface, the first surface is adjacent to the liquid crystal layer, the second surface is adjacent to the third substrate, It is characterized in that the resistive touch display device also includes a black matrix, the black matrix is arranged on the first surface, and is used to define the light-transmitting area and the non-light-transmitting area; a conductive reflective layer, and the conductive reflective layer is arranged on the first surface On the second surface, and the conductive reflective layer is disposed corresponding to the non-transparent region; and a transparent electrode layer, the transparent electrode layer is disposed on the third surface of the third substrate, the third surface is adjacent to the third substrate surface of the second substrate. The resistive touch display device of the present invention has high transmittance.

Description

Resistive touch display device

technical field

The present invention relates to the technical field of touch display devices, in particular to a resistive touch display device.

Background technique

A touch screen is arranged on the display to constitute a touch screen display device, so that the user can touch the touch screen with hands or other objects to input information to the device using the display, which can reduce or eliminate the user's need for other input devices (for example, keyboard, mouse, remote control, etc.), which is convenient for users to operate.

With the rapid development of information technology and communication network, touch technology is developing towards the direction of low cost, high yield, large size and high reliability. In order to achieve this goal, in terms of process technology, the Touch PanelSensor (sensing part of the touch panel) is integrated with the Cover lens (transparent cover) and even TFT (thin film transistor) to reduce production costs, make the thickness thinner, and more The problem of bad fit can be avoided. In terms of material technology, ITO (indium tin oxide) and other organic or inorganic alternative materials, mastering flexible film and substrate technology, or using new plastic materials on Cover Lens materials to replace more expensive reinforced glass or PMMA (acrylic) plastic plates . In terms of structural technology, the structures of Out-Cell, On-Cell and In-Cell have been developed.

The technologies used in Out-Cell are mainly projected capacitive and infrared optical; the technology used in On-Cell is generally based on projected capacitive; In-Cell touch technology uses two methods, respectively sensing The stress exerted by the finger on the upper glass substrate, the deformation effect caused by it, and the relationship between the relative light and shade changes of the detected light source to the finger. Generally speaking, the material cost of the Out-Cell structure is relatively high, and the integration degree of the In-Cell structure is high and the pass rate is low. The On-Cell structure has formed its own advantages due to its low material cost and no interference with the liquid crystal layer in the display. certain advantages. In addition to the capacitive touch technology, the current On-Cell structure can also use the resistive touch technology.

Please refer to FIG. 1 , which is a schematic structural diagram of a resistive touch display device in the prior art. As shown in the figure, the resistive touch display device 10 includes a first substrate 11, a second substrate 12, a third substrate 13 and a backlight module 15 arranged in sequence, wherein the second substrate 12 and the third substrate 13 surround The liquid crystal layer 14 between the second substrate 12 and the third substrate 13 and the backlight module 15 form a display unit.

The touch unit of the resistive touch display device 10 includes a first substrate 11 and a second substrate 12 oppositely arranged, the first substrate 11 is generally made of a transparent elastic material, and the second substrate 12 is made of a rigid transparent material to carry Certain pressure. The first substrate 11 is provided with a first transparent conductive layer 111 adjacent to the first surface of the second substrate 12 , and the second substrate 12 is provided with a second transparent conductive layer 112 adjacent to the second surface of the first substrate 11 . Wherein, the edge of the first substrate 11 and the edge of the second substrate 12 can be bonded together by an adhesive such as optical glue, double-sided tape, etc., so that the first substrate 11 is fixed on the second substrate 12 . On the second transparent conductive layer 112, a plurality of point pads 113 are arranged at intervals, and a plurality of point pads 113 have spacing and supporting functions, so that the first transparent conductive layer 111 and the second transparent conductive layer 112 are electrically insulated in the initial state state.

When using a finger or a stylus to apply a certain pressure on the surface of the touch unit of the resistive touch display device 10, so that the first transparent conductive layer 111 is in contact with the second transparent conductive layer 112, it can be determined by an external circuit or other analysis device The position of the contact point, so as to know the intention of the touch user according to the display content or icon of the corresponding coordinate point on the touch unit, and complete the touch pressure control function.

Generally speaking, the resistive touch display device 10 disclosed in FIG. 1 is formed by bonding the touch substrate (first substrate 11) and the display unit together through an adhesive. Due to the use of the touch substrate and the adhesive, the The contrast and visibility of the screen displayed by the resistive touch display device 10 are reduced, which significantly reduces user experience.

Contents of the invention

In view of the problem and deficiency of the low transmittance of the resistive touch display device in the prior art, the object of the present invention is to provide a resistive touch display device with high transmittance.

The resistive touch display device of the present invention includes a first substrate, a second substrate, a third substrate and a backlight module arranged in sequence, a liquid crystal layer surrounded by the first substrate and the second substrate, the third The substrate is located between the second substrate and the backlight module, the second substrate has opposite first and second surfaces, the first surface is adjacent to the liquid crystal layer, the second surface is adjacent to the third substrate, the resistor The type touch display device further includes a black matrix disposed on the first surface for defining a light-transmitting area and a non-transmitting area; a conductive reflective layer disposed on the second surface, And the conductive reflective layer is disposed corresponding to the non-transmissive area; and a transparent electrode layer, the transparent electrode layer is disposed on the third surface of the third substrate, and the third surface is the surface of the third substrate adjacent to the second substrate.

As an optional technical solution, the material of the conductive reflective layer is copper or aluminum.

As an optional technical solution, the conductive reflective layer is in grid shape.

As an optional technical solution, a first spacer is further included, the first spacer is disposed between the third substrate and the second substrate, and makes the third substrate and the second substrate have a first interval.

As an optional technical solution, the first spacer is a compressible spacer ball or spacer column.

As an optional technical solution, it also includes a protrusion, the protrusion extends from the third surface of the third substrate toward the direction of the second substrate, and there is a gap between the top of the protrusion and the second substrate. the second interval, and the top of the protrusion is covered by conductive material.

As an optional technical solution, a protrusion is further included, the protrusion extends from the third surface of the third substrate toward the direction of the second substrate, and the protrusion is a conductive protrusion.

As an optional technical solution, a second spacer is further included, the second spacer extends from the third surface of the third substrate toward the direction of the second substrate, and is used for maintaining the first interval.

As an optional technical solution, the transparent electrode layer is a whole-surface transparent conductive layer formed on the third surface or a plurality of strip-shaped transparent electrodes distributed in strips.

As an optional technical solution, the second substrate is an array substrate.

In the present invention, the touch unit is arranged between the array substrate and the backlight module, and a conductive reflective layer is arranged on the array substrate to replace the transparent electrode layer on the lower substrate of the resistive touch display device. The utilization rate of the light emitted by the backlight module can effectively improve the penetration rate of the resistive touch display device.

Description of drawings

FIG. 1 is a schematic structural diagram of a resistive touch display device in the prior art.

FIG. 2 is a schematic structural diagram of a resistive touch display device of the present invention.

3A is a cross-sectional view of the array substrate of the resistive touch display device of the present invention.

3B is a schematic diagram of a light-shielding matrix on the array substrate of the resistive touch display device of the present invention.

3C is a schematic diagram of a conductive reflective layer on the array substrate of the resistive touch display device of the present invention.

detailed description

In order to have a clearer and more accurate understanding of the content of the present invention, the following will be described in detail in conjunction with the accompanying drawings, which show examples of embodiments of the present invention, wherein the same reference numerals represent the same elements.

2 is a schematic structural view of the resistive touch display device of the present invention. As shown in the figure, the resistive touch display device 20 includes a first substrate 21, a second substrate 22, a third substrate 24 and a backlight module arranged in sequence. 30, surrounded by the liquid crystal layer 40 between the first substrate 21 and the second substrate 22, the third substrate 23 is located between the second substrate 22 and the backlight module 30, the second substrate 22 has an opposite first surface and a second The first surface is adjacent to the liquid crystal layer 40 , and the second surface is adjacent to the third substrate 23 .

3A is a cross-sectional view of the array substrate of the resistive touch display device of the present invention, FIG. 3B is a schematic diagram of a light-shielding matrix on the array substrate of the resistive touch display device of the present invention, and FIG. A schematic diagram of the conductive reflective layer on the array substrate of the control display device. As shown in the figure, the resistive touch display device 20 also includes a black matrix 25, which is arranged on the first surface of the second substrate 22 for defining The light-transmitting area 25A and the non-light-transmitting area 25B; the conductive reflective layer 24, which is arranged on the second surface of the second substrate 22, and the conductive reflective layer 24 is arranged corresponding to the non-light-transmissive area 25B; and, the transparent electrode layer 26, which It is disposed on the third surface of the third substrate 23 , and the third surface is a surface of the third substrate 23 adjacent to the second substrate 22 . In this embodiment, the transparent electrode layer 26 is a full-surface transparent conductive layer formed on the third surface of the third substrate 23 , for example, formed by coating a transparent ITO material on the third surface of the third substrate 23 . In other embodiments of the present invention, the transparent electrode layer 26 may also be a plurality of strip-shaped transparent electrodes distributed in a strip shape. Therefore, the pattern shape of the transparent electrode layer 26 can be selected according to actual needs, and is not limited thereto.

In this embodiment, the third substrate 23 is preferably an elastic plastic substrate, and the second substrate 22 is preferably a rigid rigid substrate. The material of the conductive reflective layer 24 is copper, aluminum or other metal or non-metallic materials capable of reflecting the light emitted by the backlight module 30 (shown by the arrow in FIG. The pattern of 24 matches the pattern of black matrix 25. The conductive reflective layer 24 can be formed by coating, printing, vapor deposition and other methods. In this embodiment, one of the functions of the conductive reflective layer 24 is to reflect the light emitted by the backlight module 30, so as to improve the utilization rate of the light emitted by the resistive touch display device 20 to the backlight module 30, thereby improving the penetration of light. Transmittance: The second function of the conductive reflective layer 24 is to serve as a touch electrode layer corresponding to the transparent electrode layer 26 to form a resistive touch sensing structure.

Specifically, the conductive reflective layer 24 partially or completely overlaps with the non-transparent region 25B. When the area of the opaque region of the display unit of the resistive touch display device 20 is greater than 50%, the conductive reflective layer 24 has a first area, and the first metal layer 221 disposed on the first surface of the second substrate 22 has a first area. Two areas, the second metal layer 222 disposed on the first surface of the second substrate 22 has a third area, wherein, due to the overlapping of the first metal layer 221, the second metal layer 222 and the conductive reflective layer 24 on the wiring pattern region, the overlapping region has a fourth area, at this time, the sum of the first area, the second area and the third area minus the value of the fourth area and the ratio of the area of the display area of the resistive touch display device 20 48%-50%. At this time, the conductive reflective layer 24 disposed on the second surface of the second substrate 22 can optimize the utilization rate of the light emitted by the backlight module 30 and the transmittance of the resistive touch display device 20 is the best. When the area of the opaque region of the display unit of the resistive touch display device 20 is less than 50% and is A%, the sum of the first area, the second area, and the third area minus the value of the fourth area is equal to The area ratio of the display area of the resistive touch display device 20 is A%, where A% is the transmittance of the resistive touch display device 20 . In this embodiment, the resistive touch display device 20 includes a display area and a non-display area surrounding the display area.

Continuing to refer to FIG. 2, the resistive touch display device 20 further includes a first spacer 231, and the first spacer 231 is disposed between the third substrate 23 and the second substrate 22, so that the distance between the third substrate 23 and the second substrate 22 is The first gap G1 is maintained between them. Preferably, the first spacer 231 is a compressible spacer ball or a spacer column. The first spacer 231 has the function of spacing and supporting, so that the transparent electrode layer 26 and the conductive reflective layer 24 are electrically insulated in an initial state. In addition, the number and distribution positions of the first spacers 231 can be set according to actual needs.

Please continue to refer to FIG. 2, the resistive touch display device 20 further includes a protrusion 233, the protrusion 232 extends from the third surface of the third substrate 23 toward the direction of the second substrate 22, and the top of the protrusion 232 is in contact with the second substrate 22. There is a second gap G2 between the second substrates 22 , preferably the second gap G2 is smaller than the first gap G1 , wherein the tops of the protrusions 232 are covered by conductive materials. Among them, the purpose of the protrusion 232 is to improve the pressing sensitivity. In this embodiment, the top of the protrusion 232 is covered by the transparent electrode layer 26 . In other embodiments of the present invention, the protrusion 232 may be completely covered by a conductive material, or the protrusion 232 is made of a conductive material, that is, the protrusion 232 is a conductive protrusion.

Please continue to refer to FIG. 2, the resistive touch display device 20 further includes a second spacer 233, and the second spacer 233 extends from the third surface of the third substrate 23 toward the direction of the second substrate 22 for maintaining the first Interval G1. Specifically, the second spacer 233 is equivalent to an auxiliary spacer for supporting the second substrate 22 to prevent misoperation caused by bending of the second substrate 22 itself when the second substrate 22 is oversized or subjected to an external force.

Continuing to refer to FIG. 2 , in this embodiment, the second substrate 22 is, for example, an array substrate, and the second substrate 22 further includes, for example, a first metal layer 221 and a second metal layer 222 disposed on the first surface of the second substrate 22 , And the spacer layer 223 disposed between the first metal layer 221 and the second metal layer 222 , the spacer layer 223 is, for example, a multi-layer structure including an insulating layer, a planar layer, and the like.

Continuing to refer to FIG. 3A , in this embodiment, the first surface of the second substrate 22 also has a switch element 28 and a color filter layer 27, wherein the switch element 28 is, for example, a thin film transistor; the color filter layer 27 corresponds to the light-transmitting area 25A setting.

To sum up, the present invention disposes the touch unit between the array substrate and the backlight module, and disposes the conductive reflective layer on the array substrate to replace the transparent electrode layer on the lower substrate of the resistive touch display device. The utilization rate of light emitted by the backlight module is improved by the conductive reflective layer, thereby effectively improving the transmittance of the resistive touch display device.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. A resistive touch display device, comprising a first substrate, a second substrate, a third substrate and a backlight module arranged in sequence, surrounded by a liquid crystal layer between the first substrate and the second substrate, the first The three substrates are located between the second substrate and the backlight module, the second substrate has opposite first and second surfaces, the first surface is adjacent to the liquid crystal layer, the second surface is adjacent to the third substrate, and It is characterized in that the resistive touch display device also includes, a black matrix, the black matrix is arranged on the first surface, and is used to define a light-transmitting area and a non-light-transmitting area; a conductive reflective layer, the conductive reflective layer is disposed on the second surface, and the conductive reflective layer is disposed corresponding to the non-light-transmitting region; and The transparent electrode layer is disposed on the third surface of the third substrate, and the third surface is a surface of the third substrate adjacent to the second substrate. 2 . The resistive touch display device according to claim 1 , wherein the material of the conductive reflective layer is copper or aluminum. 3 . The resistive touch display device according to claim 1 , wherein the conductive reflective layer is grid-shaped. 4 . 4. The resistive touch display device according to claim 1, further comprising a first spacer, the first spacer is disposed between the third substrate and the second substrate, and makes the first spacer The third substrate and the second substrate have a first interval. 5 . The resistive touch display device according to claim 4 , wherein the first spacer is a compressible spacer ball or spacer column. 6. The resistive touch display device according to claim 4, further comprising a protrusion, the protrusion extending from the third surface of the third substrate toward the direction of the second substrate, the There is a second space between the top of the protrusion and the second substrate, and the top of the protrusion is covered by a conductive material. 7. The resistive touch display device according to claim 4, further comprising a protrusion extending from the third surface of the third substrate toward the direction of the second substrate, and The protrusions are conductive protrusions. 8. The resistive touch display device according to claim 4, further comprising a second spacer extending from the third surface of the third substrate toward the direction of the second substrate , and is used to maintain this first interval. 9. The resistive touch display device according to claim 1, wherein the transparent electrode layer is a whole-surface transparent conductive layer formed on the third surface or a plurality of strip-shaped transparent electrodes distributed in strips . 10. The resistive touch display device according to claim 1, wherein the second substrate is an array substrate.