TWI834453B - Display apparatus - Google Patents

Abstract

A display apparatus including a first electrically controlled liquid crystal cell and a second electrically controlled liquid crystal cell is provided. The first electrically controlled liquid crystal cell includes a first substrate, a second substrate, a first liquid crystal layer and a touch electrode layer. The first substrate overlaps the second substrate. The first liquid crystal layer is disposed between the first substrate and the second substrate. The touch electrode layer is disposed between the first substrate and the second substrate. The second electrically controlled liquid crystal cell is disposed on one side of the first substrate of the first electrically controlled liquid crystal cell, and overlaps the first electrically controlled liquid crystal cell. An isolation layer or a conductive layer is provided between the first electrically controlled liquid crystal cell and the second electrically controlled liquid crystal cell. The isolation layer or the conductive layer is disposed on a surface of the first substrate away from the first liquid crystal layer.

Description

display device

The present invention relates to a display device, and in particular, to a display device with a touch function.

In order to provide a touch display device with an anti-peep function, a technical solution is proposed in which an electronically controlled anti-peep film is provided between the touch display panel and the backlight module. However, during touch, the coupling capacitance between the touch electrode layer in the touch display panel and the electrode layer in the electrically controlled privacy sheet is easily changed due to the deformation of the touch display panel caused by the touch pressure, resulting in a touch sensation. The measured intensity is diffused and is recognized by the system as an abnormal or invalid touch.

The present invention provides a display device with better touch accuracy.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one, part or all of the above objects or other objects, an embodiment of the present invention provides a display device. The display device includes a first electronically controlled liquid crystal cell and a second electronically controlled liquid crystal cell. The first electrically controlled liquid crystal cell includes a first substrate, a second substrate, a first liquid crystal layer and a touch electrode layer. The first substrate and the second substrate are overlapped with each other. The first liquid crystal layer is disposed between the first substrate and the second substrate. The touch electrode layer is disposed between the first substrate and the second substrate. The second electronically controlled liquid crystal cell is disposed on one side of the first substrate of the first electronically controlled liquid crystal cell and overlaps the first electronically controlled liquid crystal cell. A spacer layer or a conductive layer is provided between the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell, and the spacer layer or conductive layer is provided on the surface of the first substrate facing away from the first liquid crystal layer.

In an embodiment of the present invention, the Young's modulus of the spacer layer of the display device is greater than 22 kPa.

In an embodiment of the present invention, the film thickness of the spacer layer of the above-mentioned display device is greater than or equal to 50 μm and less than or equal to 300 μm.

In an embodiment of the present invention, the spacer layer of the above-mentioned display device is an optical adhesive layer for joining the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell.

In an embodiment of the present invention, the touch electrode layer of the above-mentioned display device is disposed on the second substrate and is located between the second substrate and the first liquid crystal layer.

In an embodiment of the present invention, the first electrically controlled liquid crystal cell of the above-mentioned display device further includes a plurality of pixel electrodes, which are disposed on the first substrate and are electrically independent of each other.

In an embodiment of the present invention, the conductive layer of the above-mentioned display device covers the entire surface of the first substrate.

In an embodiment of the present invention, the conductive layer of the above-mentioned display device has a floating potential.

In an embodiment of the present invention, the second electronically controlled liquid crystal cell of the above-mentioned display device includes a third substrate, a fourth substrate, a second liquid crystal layer, a first electrode layer and a second electrode layer. The third substrate and the fourth substrate are overlapped with each other and have first and second surfaces facing each other respectively. The second liquid crystal layer is disposed between the third substrate and the fourth substrate. The first electrode layer covers the entire first surface of the third substrate. The second electrode layer covers the entire second surface of the fourth substrate.

In an embodiment of the present invention, the fourth substrate of the above-mentioned display device is located between the third substrate and the touch electrode layer, and the second electrode layer has a ground potential.

Based on the above, in the display device according to an embodiment of the present invention, a touch electrode layer is provided in the first electronically controlled liquid crystal cell. By disposing a spacer layer or a conductive layer between the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell, it is possible to avoid the coupling capacitance between the touch electrode layer and the second electronically controlled liquid crystal cell due to the first electronically controlled liquid crystal cell during touch. The liquid crystal box changes due to the deformation, which helps to improve the touch accuracy of the display device.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. Directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the invention.

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention. Please refer to FIG. 1 , the display device 10 includes a first electronically controlled liquid crystal cell 100 and a second electronically controlled liquid crystal cell 200 . In this embodiment, the first electrically controlled liquid crystal cell 100 is, for example, a touch display panel, which may include a first substrate SUB1, a second substrate SUB2, a first liquid crystal layer LCL1 and a touch electrode layer TE. The first substrate SUB1 and the second substrate SUB2 are arranged to overlap each other, and the first liquid crystal layer LCL1 is arranged between the first substrate SUB1 and the second substrate SUB2.

It should be noted that the aforementioned overlapping relationship is, for example, that the first substrate SUB1 and the second substrate SUB2 overlap each other along the vertical direction in FIG. 1 (for example, the normal direction of the surface SUB1s of the first substrate SUB1), but is not limited thereto. Unless otherwise mentioned below, the overlapping relationship between the two components is defined in the same way, and the overlapping direction will not be described again. The materials of the first substrate SUB1 and the second substrate SUB2 may include glass, quartz, high molecular polymer (such as polyimide PI, polycarbonate PC, polymethyl methacrylate PMMA), or other suitable light-transmitting plates. .

The present invention does not limit the working mode of the first liquid crystal layer LCL1. For example, the working mode of the first liquid crystal layer LCL1 may be twisted nematic (TN), super twisted nematic (STN), electrically controlled birefringence (ECB), optical compensation Modes such as optically compensated bend (OCB), in-plane switching (IPS), vertical alignment (VA), fringe field switching (FFS), etc.

For example, the first electrically controlled liquid crystal cell 100 may further include a plurality of pixel electrodes PE disposed on the first substrate SUB1 and electrically independent of each other. These pixel electrodes PE can define multiple pixel areas of the touch display panel (ie, the first electronically controlled liquid crystal cell 100). In order to individually control these pixel electrodes PE, the first electronically controlled liquid crystal cell 100 may also include a plurality of active components (not shown), a plurality of scan lines (not shown), and a plurality of data lines (not shown), Each active component can be electrically connected to a corresponding scan line, a data line and a pixel electrode PE. The scan lines are configured to transmit gate drive signals that control active components to turn on or off. The data line is configured to transmit a driving voltage signal used to make the pixel electrode PE have a specific potential.

The touch electrode layer TE is disposed between the first substrate SUB1 and the second substrate SUB2. In this embodiment, the touch electrode layer TE can be selectively disposed on the first substrate SUB1 and is located between the first substrate SUB1 and the first liquid crystal layer LCL1. That is to say, the first liquid crystal layer LCL1 is located between the pixel electrode PE (or the touch electrode layer TE) and the second substrate SUB2. For example, an insulating layer INS may be disposed between the touch electrode layer TE and the pixel electrode PE to ensure electrical independence between them.

In this embodiment, in addition to being used for touch sensing, the touch electrode layer TE can also be used as a common electrode of the display pixels, but is not limited thereto. For example, during the display period of the touch display panel, the electric field formed between each pixel electrode PE and the touch electrode layer TE can be used to drive the first liquid crystal layer LCL1. During the touch sensing period of the touch display panel, the touch electrode layer TE is used to sense the user's touch action. However, the present invention is not limited to this. According to other embodiments, the touch electrode layer and the common electrode layer of the display pixel may be the same film layer, but are structurally separated and electrically independent from each other.

In this embodiment, the touch electrode layer TE and the pixel electrode PE are, for example, light-transmitting electrodes, and the materials of the light-transmitting electrodes include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum Tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the above.

The second electronically controlled liquid crystal cell 200 is disposed on one side of the first substrate SUB1 of the first electronically controlled liquid crystal cell 100 and overlaps the first electronically controlled liquid crystal cell 100 . On the other hand, in this embodiment, the second electronically controlled liquid crystal box 200 is, for example, an electronically controlled privacy sheet with a viewing angle switching function, but is not limited thereto. For example, the second electrically controlled liquid crystal cell 200 may include a third substrate SUB3, a fourth substrate SUB4, a second liquid crystal layer LCL2, a first electrode layer EL1 and a second electrode layer EL2. The third substrate SUB3 and the fourth substrate SUB4 are arranged to overlap each other, and the second liquid crystal layer LCL2 is arranged between the third substrate SUB3 and the fourth substrate SUB4. The materials of the third substrate SUB3 and the fourth substrate SUB4 may include glass, quartz, high molecular polymer (such as polyimide PI, polycarbonate PC, polymethyl methacrylate PMMA), or other suitable light-transmitting plates. .

In detail, the third substrate SUB3 and the fourth substrate SUB4 respectively have a first surface SUB3s and a second surface SUB4s facing each other. The first electrode layer EL1 covers the entire first surface SUB3s of the third substrate SUB3. The second electrode layer EL2 covers the entire second surface SUB4s of the fourth substrate SUB4. More specifically, the first electrode layer EL1 and the second electrode layer EL2 in this embodiment may be formed of unpatterned conductive layers. The first electrode layer EL1 and the second electrode layer EL2 are, for example, light-transmitting electrodes, and the materials of the light-transmitting electrodes include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum Zinc oxide, or other suitable oxides, or a stack of at least two of the above.

In this embodiment, the fourth substrate SUB4 of the second electrically controlled liquid crystal cell 200 is located between the third substrate SUB3 and the touch electrode layer TE, and the second electrode layer EL2 may have a ground potential GND. For example, when the second electronically controlled liquid crystal cell 200 is enabled, the electric field formed between the first electrode layer EL1 and the second electrode layer EL2 can be used to drive the second liquid crystal layer LCL2 to cause the light from the backlight (not shown) ) after passing through the second electronically controlled liquid crystal box 200, the light emission angle is reduced to achieve the anti-peep display effect. On the contrary, when the second electronically controlled liquid crystal cell 200 is disabled, the light emission angle of the light from the backlight will not substantially change after passing through the second electronically controlled liquid crystal cell 200 , so the display device 10 can function normally. Perform display operations within the viewing angle range.

The present invention does not limit the working mode of the second liquid crystal layer LCL2. For example, the working mode of the second liquid crystal layer LCL2 may be twisted nematic (TN), super twisted nematic (STN), electrically controlled birefringence (ECB), optical compensation Modes such as optically compensated bend (OCB), in-plane switching (IPS), vertical alignment (VA), fringe field switching (FFS), etc.

Furthermore, in this embodiment, in order to reduce the capacitive coupling effect between the touch electrode layer TE in the first electronically controlled liquid crystal cell 100 and the second electrode layer EL2 in the second electronically controlled liquid crystal cell 200, the first electronically controlled liquid crystal cell A spacer layer 150 can be provided between the liquid crystal cell 100 and the second electronically controlled liquid crystal cell 200 . More specifically, the spacer layer 150 is disposed on the surface SUB1s of the first substrate SUB1 of the first electronically controlled liquid crystal cell 100 facing away from the first liquid crystal layer LCL1. For example, in this embodiment, the spacer layer 150 can be an optical glue layer used to join the first electronically controlled liquid crystal cell 100 and the second electronically controlled liquid crystal cell 200 . The material of the optical glue layer can include optically transparent resin (optical transparent resin). clear resin (OCR), optical clear adhesive (OCA), or other suitable optical grade adhesive materials, but is not limited to this.

Preferably, the film thickness t of the spacer layer 150 along the vertical direction of FIG. 1 (for example, the normal direction of the surface SUB1s of the first substrate SUB1) may be greater than or equal to 50 μm and less than or equal to 300 μm. Through the limitation of the above film thickness range, the arrangement of the spacer layer 150 can effectively suppress the capacitive coupling effect between the touch electrode layer TE and the second electrode layer EL2. Even if the first electronically controlled liquid crystal cell 100 is deformed by touch pressure, the change in coupling capacitance between the touch electrode layer TE and the second electrode layer EL2 can be controlled within a reasonable range without affecting the interpretation of the touch point.

However, the present invention is not limited to this. From another point of view, the spacer layer 150 may also be formed of a light-transmitting material layer with a Young's modulus greater than 22 kPa. The spacer layer 150 whose Young's modulus is within the aforementioned range can suppress the deformation of the first electronically controlled liquid crystal cell 100 when it is pressed by touch, thereby reducing the change in coupling capacitance between the touch electrode layer TE and the second electrode layer EL2 The amount helps to improve the touch accuracy of the display device 10 .

Another embodiment will be enumerated below to describe the present disclosure in detail, in which the same components will be marked with the same symbols, and the description of the same technical content will be omitted. Please refer to the previous embodiment for the omitted parts, which will not be described again below.

FIG. 2 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. Please refer to FIG. 2 . In this embodiment, the display device 20 uses a conductive layer 160 to replace the spacer layer 150 of the display device 10 in FIG. 1 . In detail, the conductive layer 160 in this embodiment is disposed on the surface SUB1s of the first substrate SUB1 of the first electronically controlled liquid crystal cell 100 that is away from the first liquid crystal layer LCL1. For example, in this embodiment, the conductive layer 160 can cover the entire surface SUB1s of the first substrate SUB1 (that is, not patterned), but is not limited to this.

It is particularly noted that in this embodiment, the conductive layer 160 is not coupled to any external power source or circuit, that is, the conductive layer 160 may have a floating potential. Accordingly, it is ensured that the touch electrode layer TE can perform normal touch sensing.

On the other hand, since the conductive layer 160 is directly disposed on the first electrically controlled liquid crystal cell 100 and is located between the touch electrode layer TE and the second electrode layer EL2, it can not only shield the touch electrode layer TE and the second electrode layer EL2, but also shield the touch electrode layer TE and the second electrode layer EL2. In addition to the coupling capacitance between the electrode layers EL2, the coupling capacitance between the conductive layer 160 and the touch electrode layer TE is also less likely to change significantly due to the deformation of the first electronically controlled liquid crystal cell 100 caused by touch pressing. This helps to improve the touch accuracy of the display device 20 .

In this embodiment, the conductive layer 160 is, for example, a light-transmitting electrode, and the material of the light-transmitting electrode includes metal oxide (for example, indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide). oxide, or other suitable oxide, or a stacked layer of at least two of the above), or a thinned metal.

To sum up, in the display device according to an embodiment of the present invention, the first electronically controlled liquid crystal cell is provided with a touch electrode layer. By disposing a spacer layer or a conductive layer between the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell, it is possible to avoid the coupling capacitance between the touch electrode layer and the second electronically controlled liquid crystal cell due to the first electronically controlled liquid crystal cell during touch. The liquid crystal box changes due to the deformation, which helps to improve the touch accuracy of the display device.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, that is, simple equivalent changes and modifications may be made based on the patent scope of the present invention and the content of the present invention. All are still within the scope of the patent of this invention. In addition, any embodiment or patentable scope of the present invention does not need to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract section and title are only used to assist in searching patent documents and are not intended to limit the scope of the invention. In addition, terms such as “first” and “second” mentioned in this specification or the scope of the patent application are only used to name elements or to distinguish different embodiments or scopes, and are not used to limit the number of elements. upper or lower limit.

10, 20: Display device 100:The first electronically controlled liquid crystal box 150: spacer layer 160: Conductive layer 200: The second electronically controlled liquid crystal box EL1: first electrode layer EL2: Second electrode layer GND: ground potential INS: insulation layer LCL1: first liquid crystal layer LCL2: second liquid crystal layer PE: pixel electrode SUB1: first substrate SUB1s: surface SUB2: Second substrate SUB3: The third substrate SUB3s: first surface SUB4: The fourth substrate SUB4s: Second surface t: film thickness TE: touch electrode layer

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.

10:Display device

100:The first electronically controlled liquid crystal box

150: spacer layer

200: The second electronically controlled liquid crystal box

EL1: first electrode layer

EL2: second electrode layer

GND: ground potential

INS: insulation layer

LCL1: first liquid crystal layer

LCL2: second liquid crystal layer

PE: pixel electrode

SUB1: first substrate

SUB1s: surface

SUB2: Second substrate

SUB3: The third substrate

SUB3s: first surface

SUB4: The fourth substrate

SUB4s: Second surface

t: film thickness

TE: touch electrode layer

Claims (10)

A display device, including: a first electronically controlled liquid crystal cell, including: a first substrate and a second substrate, arranged to overlap each other; a first liquid crystal layer, arranged between the first substrate and the second substrate; and a touch electrode layer disposed between the first substrate and the second substrate; and a second electronically controlled liquid crystal cell disposed on one side of the first substrate of the first electronically controlled liquid crystal cell and overlapping In the first electronically controlled liquid crystal cell, the second electronically controlled liquid crystal cell includes: a third substrate and a fourth substrate, which are overlapped with each other and respectively have a first surface and a second surface facing each other; Two liquid crystal layers are provided between the third substrate and the fourth substrate; a first electrode layer is provided on the first surface of the third substrate; and a second electrode layer covers the entire surface of the third substrate. The second surface of the four substrates, wherein the first substrate is located between the second substrate and the fourth substrate, the fourth substrate is located between the first substrate and the third substrate, the spacer layer or the conductive layer Disposed between the first substrate and the fourth substrate, and suitable for suppressing the capacitive coupling effect between the touch electrode layer and the second electrode layer, the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell There is a spacer layer or a conductive layer therebetween, and the spacer layer or the conductive layer is disposed on a surface of the first substrate facing away from the first liquid crystal layer. The display device according to claim 1, wherein the Young's modulus of the spacer layer is greater than 22 kPa. The display device according to claim 1, wherein the film thickness of the spacer layer is greater than or equal to 50 μm and less than or equal to 300 μm. The display device of claim 1, wherein the spacer layer is an optical adhesive layer for joining the first electronically controlled liquid crystal cell and the second electronically controlled liquid crystal cell. The display device of claim 1, wherein the touch electrode layer is disposed on the second substrate and is located between the second substrate and the first liquid crystal layer. The display device of claim 5, wherein the first electrically controlled liquid crystal cell further includes a plurality of pixel electrodes, which are disposed on the first substrate and are electrically independent of each other. The display device of claim 1, wherein the conductive layer covers the entire surface of the first substrate. The display device of claim 1, wherein the conductive layer has a floating potential. The display device of claim 1, wherein the first electrode layer entirely covers the first surface of the third substrate. The display device of claim 9, wherein the fourth substrate is located between the third substrate and the touch electrode layer, and the second electrode layer has a ground potential.

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