TWM647397U - Touch control display with anti-peep mode and wide-angle mode and viewing angle control module thereof - Google Patents

Abstract

The novel touch display with anti-peep mode and wide-angle mode includes a display module, a viewing angle control module, a touch module and a cover. The viewing angle control module is arranged on the On the display module, the touch module is arranged on the viewing angle control module, and the cover is arranged on the touch module. When the touch display executes an anti-peep mode, the light emitted from the display module The oblique light will be affected by the viewing angle control module and cannot emit from the cover; the ambient oblique light outside the touch display will also be reflected from the cover due to the effect of the viewing angle control module. When the touch display executes a wide-angle mode, oblique light emitted from the display module is not affected by the viewing angle control module and can emit from the cover.

Description

Touch display with anti-peep mode and wide-angle mode and its viewing angle control module

The present invention relates to a touch display, in particular to a touch display with anti-peep mode and wide-angle mode and its viewing angle control module.

With the advancement of technology, using electronic products (such as smartphones) in public places has become a daily behavior for users. In order to avoid the display screen of their electronic products being peeked by people around them when transmitting information, some users An anti-peep protective film is affixed to the display screen to achieve the effect of anti-peep; or some manufacturers have introduced an anti-peep touch display 50 as shown in Figure 10. The anti-peep touch display 50 can be applied to the above-mentioned The electronic product includes a display module 51, a touch module 52, a cover 53 and a controllable viewing angle optical film 54.

The display module 51 is used to display an image. The touch module 52 is disposed on the upper surface of the display module 51. The cover 53 is disposed on the upper surface of the touch module 52. The viewing angle optics can be controlled. The film 54 is provided on the upper surface of the cover plate 53 . Regarding how the anti-peep touch display 50 achieves the anti-peep effect, please refer to Figure 11. The structure of the controllable viewing angle optical film 54 mainly includes a plurality of light shielding sheets 55. The plurality of light shielding sheets 55 are arranged in parallel on the controllable angle optical film. Inside the film 54, the controllable viewing angle optical film 54 forms a structure similar to a micro grating; when the display module 51 serves as a light source 56 (ie, displays the image) and emits light from the cover 53, Users located in a front viewing angle range R1 can see the image frame, while users located in a side viewing angle range R2 will not be able to see the image frame because they are blocked by the controllable viewing angle optical film 54. Therefore, To achieve the anti-peep effect; for example, based on a central axis A1 perpendicular to the surface of the controllable viewing angle optical film 54, the angle between the central axis A1 and the central axis A1 is in the range of 0 degrees to 30 degrees. The angle between the viewing angle range R1 and the central axis A1 is from 30 degrees to 90 degrees, which is the side viewing angle range R2.

However, because the viewing angle controlling optical film 54 blocks the lateral light emitted from the cover 53 through the physical structure, although the privacy-preventing touch display 50 can achieve the privacy-preventing effect, it cannot be switched to a non-privacy-preventing state. In this state, if the anti-privacy touch display 50 is used in electronic devices such as notebook computers and tablet computers, when multiple users need to view the display screen (i.e. the anti-privacy touch display 50) at the same time, the privacy protection touch display 50 is located at the Users on both sides of the privacy touch display 50 will not be able to see the display content of the privacy touch display 50 , resulting in the privacy touch display 50 limiting the flexibility of use of the electronic device.

In view of the fact that the existing anti-privacy touch display can only maintain the anti-privacy state and cannot be switched to the non-privacy state, there is a problem in the existing anti-privacy touch display when there are multiple users. To solve the problem that users on both sides of the touch display cannot view the displayed content, the present invention proposes a touch display with anti-peep mode and wide-angle mode and a module for controlling the viewing angle. The touch display with anti-peep mode includes : A display module used to generate a first oblique linearly polarized light; a viewing angle control module disposed on the upper surface of the display module, and including: a first liquid crystal unit disposed on the display module the upper surface of the first circularly polarizing plate; a first circularly polarizing plate, arranged on the upper surface of the first liquid crystal unit; a first polarizing plate, arranged on the upper surface of the first circularly polarizing plate; a second circularly polarizing plate, arranged on the upper surface of the first liquid crystal unit; the upper surface of the first polarizing plate; a second liquid crystal unit disposed on the upper surface of the second circularly polarizing plate; a second polarizing plate disposed on the upper surface of the second liquid crystal unit; a touch module disposed On the upper surface of the second polarizing plate; a cover plate is provided on the upper surface of the touch module to receive an ambient oblique light; wherein, when the touch display executes an anti-peep mode, the first A liquid crystal unit and the second liquid crystal unit respectively receive a control bias voltage, and the control bias voltage can drive the first liquid crystal unit to switch the first oblique direction. The linearly polarized light is a first circularly polarized light. The first circularly polarized light is converted into a second obliquely linearly polarized light by the first circularly polarized plate. The second obliquely linearly polarized light is affected by the first polarizing plate. And reflected in the direction of the display module; the second polarizer converts the ambient oblique light into a third oblique linear polarization, and the control bias can drive the second liquid crystal unit to convert the third oblique linear polarization The light is a second circularly polarized light. The second circularly polarized light is converted into a fourth oblique linearly polarized light by the second circularly polarizing plate. The fourth oblique linearly polarized light is directed toward the first polarizing plate by the action of the first polarizing plate. The cover plate reflects in a direction; when the touch display executes a wide-angle mode and the first liquid crystal unit and the second liquid crystal unit do not receive the control bias, the first oblique linearly polarized light can be emitted from the cover plate.

The viewing angle control module proposed by the present invention includes: a first liquid crystal unit; a first circularly polarizing plate disposed on the upper surface of the first liquid crystal unit; and a first polarizing plate disposed on the first circularly polarizing plate. the upper surface of the second circularly polarizing plate; a second circularly polarizing plate, arranged on the upper surface of the first polarizing plate; a second liquid crystal unit, arranged on the upper surface of the second circularly polarizing plate; a second polarizing plate, arranged on the upper surface of the first polarizing plate; The upper surface of two liquid crystal units; wherein, when the first liquid crystal unit and the second liquid crystal unit respectively receive a control bias, the control bias can drive the first liquid crystal unit to convert a first oblique linearly polarized light into a first circularly polarized light, the first circularly polarized light is converted into a second obliquely linearly polarized light by the first circularly polarizing plate, and the second obliquely linearly polarized light is reflected by the first polarizing plate; The second polarizer converts an ambient oblique light into a third oblique linearly polarized light, and the control bias can drive the second liquid crystal unit to convert the third obliquely linearly polarized light into a second circularly polarized light. The two circularly polarized lights are converted into a fourth obliquely linearly polarized light by the second circularly polarized plate, and the fourth obliquely linearly polarized light is reflected by the first polarizing plate; when the first liquid crystal unit and the second liquid crystal When the unit does not receive the control bias, the first obliquely linearly polarized light can be emitted from the first liquid crystal unit to the second polarizing plate.

This new type of touch display with anti-peep mode and wide-angle mode controls the touch display to execute an anti-peep mode and a wide-angle mode through a viewing angle control module. In the anti-peep mode, the light changes from the display mode The oblique light emitted by the group will be affected by the first liquid crystal unit and the first circular polarizer, and will eventually be reflected by the first polarizer and cannot be emitted from the display surface of the touch display; and the outside of the touch display The ambient oblique light, also due to the action of the second polarizer, a second liquid crystal unit and a second circular polarizer, is finally reflected by the first polarizer and emitted from the display surface of the touch display.

For the user, when looking directly at the touch display, the user can see an image produced by the touch display. When looking sideways at the touch display, the user cannot see the image, thereby achieving an anti-peep effect. In the wide-angle mode, the forward light and oblique light emitted from the display module will not be affected by the viewing angle control module, and can be emitted from the display surface of the touch display. For those located in front of the touch display All users can see the image generated by the touch display, so that the touch display can be used by multiple people. To sum up, the new touch display with anti-peep mode can select the anti-peep mode or the wide-angle mode according to the user's needs, thereby increasing the flexibility of use of the touch display.

1:Touch display

10:Display module

20: Control viewing angle module

21:LCD unit

21A: First LCD unit

21B: Second LCD unit

22: Circular polarizer

22A: The first circular polarizer

22B: Second circular polarizer

220: first surface

221: Second surface

23:First polarizer

24:Second polarizing plate

30:Touch module

40:Cover

41:Visual area

50:Peep-proof touch display

51:Display module

52:Touch module

53:Cover

54: Optical film with controllable viewing angle

55:Shading film

56:Light source

A1: Central axis

EL: ambient light source

L1: forward linearly polarized light

L2: Oblique linearly polarized light

L1’, L2’: circularly polarized light

L3, L4: linearly polarized light

L3’, L4’: circularly polarized light

L5: incident light

L5A: first linearly polarized light

L5B: Second linearly polarized light

L6: incident light

L6’: linearly polarized light

L7: first incident light

L8: Second incident light

L9: ambient oblique light

R1: Frontal viewing angle range

R2: Side viewing angle range

V: control bias voltage

Figure 1: Structural diagram of this new type of touch display with anti-peep mode and wide-angle mode.

Figure 2A: Schematic diagram of the polarization principle of the liquid crystal unit in the new viewing angle control module, in which the liquid crystal module is connected with a control bias.

Figure 2B: Schematic diagram of the polarization principle of the liquid crystal unit in the new viewing angle control module, in which the liquid crystal module is not connected to the control bias.

Figure 3: Schematic diagram of the polarization principle of the circular polarizer in this new viewing angle control module.

Figure 4: Schematic diagram of the polarization principle of the first polarizer in the new viewing angle control module.

Figure 5: Schematic diagram of the polarization principle of the second polarizer in the new viewing angle control module.

Figure 6: Schematic diagram of the propagation of forward light and oblique light emitted by the display module in this new type of touch display with anti-peep mode and wide-angle mode.

Figure 7: Schematic diagram of the propagation of ambient oblique light incident on this new type of touch display with anti-peep mode and wide-angle mode.

Figure 8: Schematic diagram of the operation of the new touch display with anti-peep mode and wide-angle mode, in which the touch display executes the anti-peep mode.

Figure 9: Schematic diagram of the operation of the new touch display with anti-peep mode and wide-angle mode, in which the touch display executes the wide-angle mode.

Figure 10: Structural diagram of an existing anti-peep touch display.

Figure 11: Schematic diagram of the anti-peep principle of the existing controllable viewing angle optical film.

In order to understand the technical features and practical effects of the present invention in detail, and to implement them according to the content of the new model, the following is a detailed description of the embodiment as shown in the figures: The new type of touch screen with anti-peep mode and wide-angle mode. Please refer to Figure 1 for a control display and its viewing angle control module. The new touch display 1 includes a display module 10, the viewing angle control module 20, a touch module 30 and a cover 40.

The display module 10 is used to display an image. The display module 10 can be a thin film transistor liquid crystal display (TFT-LCD). For example, the display module 10 can include a A liquid crystal module, a backlight module and a driving module. The back side of the liquid crystal module is arranged on the front side of the backlight module. The driving module is arranged on the back side of the backlight module. The driving module and the liquid crystal module The group and the backlight module are electrically connected to drive the operation of the liquid crystal module and the backlight module, causing the image screen to be displayed on the front of the liquid crystal module, where the front of the liquid crystal module is as shown in Figure 1 The upper surface of the display module 10 is shown.

The viewing angle control module 20 is disposed on the upper surface of the display module 10 and includes two liquid crystal units 21, two circular polarizers 22, a first polarizer 23 and a second polarizer 24. Regarding the two liquid crystal units, 21. The respective functions of the two circularly polarizing plates 22, the first polarizing plate 23 and the second polarizing plate 24 and their arrangement will be described in detail later.

The touch module 30 is disposed on the upper surface of the viewing angle control module 20 for sensing the user's touch operation. For example, the touch module 30 includes a touch substrate and a touch screen. The lower surface of the touch substrate is disposed on the upper surface of the viewing angle control module 20, the touch electrode region is disposed on the upper surface of the touch substrate, and the touch electrode region can be formed by oxidation. A transparent conductive film layer made of indium tin (ITO) senses the user's touch operation through self-capacitance sensing technology or mutual capacitance sensing technology.

The cover 40 covers the touch module 30 , the viewing angle control module 20 and the display module 10 to protect the aforementioned components. Specifically, the cover 40 includes a substrate and an ink layer. , the substrate can be a transparent substrate, such as a glass substrate, the lower surface of the substrate is provided with the ink layer, the ink layer is ringed around the edge of the lower surface of the substrate, so that a visible area is formed in the center of the substrate, and the visible area The display module 10 can display the image, and the position of the visible area corresponds to the position of the touch electrode area, so that the user can operate and control the touch screen through the upper surface of the substrate (the upper surface of the cover 40 ). Touch module 30.

Regarding the arrangement structure of the two liquid crystal units 21, the two circular polarizers 22, the first polarizer 23 and the second polarizer 24, the two liquid crystal units 21 are divided into a first liquid crystal unit 21A and a second liquid crystal unit. 21B, the two circularly polarizing plates 22 are divided into a first circularly polarizing plate 22A and a second circularly polarizing plate 22B. The lower surface of the first liquid crystal unit 21A is the lower surface of the viewing angle control module 20 , the first circular polarizer 22A is disposed on the upper surface of the first liquid crystal unit 21A, and the first polarizer 23 is disposed on the The upper surface of the first circularly polarizing plate 22A, the second circularly polarizing plate 22B is disposed on the upper surface of the first polarizing plate 23 surface, the second liquid crystal unit 21B is disposed on the upper surface of the second circularly polarizing plate 22B, and the second polarizing plate 24 is disposed on the upper surface of the second liquid crystal unit 21B.

Each liquid crystal unit 21 may be a liquid crystal display (LCD) filled with birefringence material. The liquid crystal unit 21 may be driven by a control bias. When the liquid crystal unit 21 is driven by the control bias, the liquid crystal unit 21 may be driven by the control bias. The liquid crystal unit 21 can determine the phase of the incident light as a circularly polarized light according to the incident angle of the incident light. Specifically, please refer to FIG. 2A. When the liquid crystal unit 21 receives a control bias V and is driven by the control bias V, the liquid crystal unit 21 can convert a forward linearly polarized light L1 (vertical incidence) incident on its surface. ) is converted into a circularly polarized light L1' with a first phase, and an oblique linearly polarized light L2 (non-normal incidence) incident on the surface of the liquid crystal cell 21 is converted into a circularly polarized light L2' with a second phase, where , the first phase and the second phase are not equal. Preferably, the first phase and the second phase have opposite directions, that is, a difference between the first phase and the second phase is π. Referring to FIG. 2B , when the liquid crystal unit 21 is not driven by the control bias voltage V, the first phase will be equal to the second phase.

Each of the circularly polarizing plates 22 is used to convert a linear polarized light into a circularly polarized light or convert a circularly polarized light into a linearly polarized light. Specifically, each of the circularly polarizing plates 22 is a phase retarder that can pass through a fast and slow axis electromagnetic field. The relative phase of the incident light causes dislocation of the incident light. Please refer to Figure 3. Each circular polarizing plate 22 has a first surface 220 and a second surface 221. The first surface 220 and the second surface 221 are arranged opposite to each other in the circle. On both sides of the polarizer, for example, when the linear polarized light L3 is incident on the first surface 220 of the circularly polarized plate 22, a circularly polarized light L3' will be emitted from the second surface 221. On the contrary, when the circularly polarized light L3' is emitted from the second surface 221, When L3' is incident on the second surface 220 of the circularly polarizing plate 22, the linearly polarized light L3 will be emitted from the first surface 220, wherein the circularly polarized light L3' has a third phase; when the linearly polarized light L4 When the circularly polarized light L4' is incident from the second surface 221, a circularly polarized light L4' will be formed and emitted from the first surface 220. On the contrary, when the circularly polarized light L4' is incident from the first surface 220, a linearly polarized light L4 will be formed from the first surface 220. Two surfaces 221 Emitted, wherein the circularly polarized light L4' has a fourth phase, and the fourth phase and the third phase are in an inverse relationship, that is, a difference between the third phase and the fourth phase is π.

The first polarizer 23 can be a reflective polarizer and has a polarization direction. The first polarizer 23 can allow part of the incident light to penetrate the first polarization according to the polarization direction and a polarization state of the incident light. The plate 23 forms a line of polarized light, and the remaining incident light is reflected from the incident surface of the first polarizing plate. For example, please refer to FIG. 4 . When an incident light L5 is incident on the first polarizing plate 23 , the light with the same polarization state and the polarization direction in the incident light L5 will penetrate the first polarizing plate 23 and form a polarizing plate 23 . In the first linearly polarized light L5A, the light ray whose polarization state is orthogonal to the polarization direction in the incident light L5 will be reflected from the incident surface of the first polarizer 23 to form a second linearly polarized light L5B, in which the third linearly polarized light L5A is formed. The polarization state of the linearly polarized light L5A is the same as the polarization direction, and the polarization state of the second linearly polarized light L5B is orthogonal to the polarization direction.

The second polarizing plate 24 can be a linear polarizing plate for converting incident light without specific polarization characteristics into linear polarized light. For example, please refer to FIG. 5 . The second polarizing plate 24 has a surface direction thereof. In a vertical polarization direction, when an incident light L6 is incident on the second polarizer 24, a linear polarized light L6' will be emitted, and the polarization state of the linearly polarized light L6' is the same as the polarization direction, and both are vertical to the second polarization. The surface of the piece 24.

The touch display with an anti-peep mode of the present invention achieves a viewing angle limit based on the component setting relationship in the viewing angle control module 20, and can execute an anti-peep mode and a wide-angle mode. The anti-peep mode is based on the two liquid crystal units. 21 are respectively driven by the control bias voltage V, and the wide-angle mode means that the two liquid crystal units 21 are not driven by the control bias voltage V; the setting relationship of the components in the control viewing angle module 20 can be divided into two situations to share the same Reaching the viewing angle limit, the two situations are as follows:

1. Block the oblique light emission of the display module 10 .

2. Strengthen the reflection of ambient light. The following two situations will be described based on the touch display 1 executing the anti-peep mode and the relationship between light changes in each component in the viewing angle control module 20 .

1. Block the oblique light emission of the display module 10: Please refer to Figure 6. In this case, when the display module 10 displays the image screen, a first incident light L7 and a second incident light L8 emit light from the display module 10. Emitted from the display module 10, the first incident light L7 is a forward linearly polarized light, the second incident light L8 is an oblique linearly polarized light (hereinafter defined as a first obliquely linearly polarized light), and the second incident light L7 is a forward linearly polarized light. The phase directions of the incident light L7 and the second incident light L8 are equal. It should be noted that "forward" and "oblique" refer to a forward direction of light, and the characteristics of a polarized light can include a forward direction and a vibration direction, wherein the forward direction can include a forward direction. and an oblique direction. The forward direction indicates that the light enters the incident surface of the component perpendicularly or exits perpendicularly from the exit surface of the component. The oblique direction indicates that the light enters the incident surface of the component non-perpendicularly or exits non-perpendicularly from the component's exit surface. The exit surface is ejected.

First, the first incident light L7 and the second incident light L8 are converted into a circularly polarized light respectively by the first liquid crystal unit 21A (wherein, the second incident light L8 is converted into a first circularly polarized light), Because the first incident light L7 and the second incident light L8 have different forward directions, the angles at which they enter the first liquid crystal unit 21A are different, so that the phase directions of the first incident light L7 and the second incident light L8 are different. There is an inverse relationship; the first incident light L7 and the second incident light L8 are then acted upon by the first circularly polarizing plate 22A and converted back to a forward linearly polarized light and an oblique linearly polarized light (hereinafter defined as a second oblique linearly polarized light), after conversion, the phase directions of the first incident light L7 and the second incident light L8 are in an orthogonal relationship.

Then, the first incident light L7 and the second incident light L8 enter the first polarizing plate 23. The first polarizing plate 23 can be a reflective polarizing plate. Assume that the polarization direction of the first polarizing plate 23 is consistent with that of the third polarizing plate 23. The phase direction (polarization state) of an incident light L7 is the same, because the phase direction of the second incident light L8 is orthogonal to the phase direction of the first incident light L7, so that the first incident light L7 can penetrate the third incident light L7. one side The second incident light L8 (the second oblique linearly polarized light) is reflected from the first polarizing plate 23 toward the display module.

The first incident light L7 is then converted into a circularly polarized light by the action of the second circularly polarizing plate 22B, and then converted back into a forward linearly polarized light by the action of the second liquid crystal unit 21B. Assuming that the second polarizing plate 24 The polarization direction is the same as the phase direction (polarization state) of the first incident light L7, so that the first incident light L7 can penetrate the second polarizer 24 and the touch module 30, and finally the first incident light L7 can pass through the second polarizer 24 and the touch module 30. The incident light L7 is emitted from the surface of the cover 40 in the form of forward linearly polarized light.

When the touch display 1 executes the anti-peep mode, the forward light emitted by the display module 10 can eventually emit from the front surface of the cover 40 , and the oblique light emitted by the display module 10 is affected by the third The liquid crystal unit 21A and the first circularly polarizing plate 22A are eventually reflected by the first polarizing plate 23 and cannot be emitted from the lateral surface of the cover 40; for the user, when looking directly at the touch display 1, the user can see the content of the image screen. When looking sideways at the touch display 1, the user will not be able to see the image screen, thereby achieving an anti-peep effect.

2. Strengthen the reflection of ambient light: Please refer to Figure 7. In this case, there is an ambient light source EL outside the touch display 1. The ambient light source EL generates an ambient oblique light L9, and the ambient oblique light L9 passes through the cover. The surface of the panel 40 is incident obliquely on the touch display 1 . Among them, the ambient light source EL can be any object in the environment of the touch display 1, and the ambient light source EL is not limited to a self-illuminating source to generate the ambient oblique light L9. The ambient oblique light L9 can be illuminated by other light sources. The ambient light source EL is generated through physical processes such as diffusion, scattering, and reflection.

The ambient oblique light L9 is unpolarized light, which penetrates the cover 40 and the touch module 30 and then enters the second polarizer 24 . The ambient oblique light L9 is converted by the second polarizer 24 is an oblique linearly polarized light (hereinafter defined as a third obliquely linearly polarized light); then enters the second liquid crystal unit 21B and is converted into a circularly polarized light (hereinafter defined as a second circularly polarized light), and the second The circularly polarized light re-enters the second circularly polarizing plate 22B and is converted into a fourth obliquely linearly polarized light, because the fourth obliquely linearly polarized light (i.e. The polarization state of the ambient oblique light L9 is orthogonal to the polarization direction of the first polarizer 23 , causing the ambient oblique light L9 to be reflected from the first polarizer 23 . The reflected ambient oblique light L9 will advance toward the cover 40 in a reverse direction according to the aforementioned incident process, and finally be emitted from the surface of the cover 40 .

In order to more specifically illustrate the effect that can be achieved in this case, take the ambient light source EL as a chair as an example. The chair is located on one side of the touch display 1. When the second liquid crystal unit 21B receives the control bias V, As shown in Figure 8, the surface of a visible area 41 of the touch display 1 will be in a mirror-like state, and the light emitted from the chair will be reflected to the other side of the touch display 1. When a user is located on the When touching the other side of the display 1, the user can only see the reflection image of the chair in the touch display 1 (the image of the chair is not shown in Figure 8), but cannot see the reflection generated by the touch display 1. This image screen achieves the effect of preventing privacy.

Please refer to FIG. 9 . When the touch display 1 executes the wide-angle mode, because the second liquid crystal unit 21 is not driven by the control bias V, the oblique light emitted from the display module 10 will not be affected by the third liquid crystal unit 21 . The reflection of a polarizing plate 23 can be emitted from the lateral surface of the cover 40 , and the user located on one side of the touch display 1 can clearly see the displayed content in the visual area 41 .

This new type of touch display has an anti-peep mode and a wide-angle mode. The touch display 1 has an anti-peep mode and a wide-angle mode, and a viewing angle control module 20 controls the touch display 1 in the anti-peep mode and the wide-angle mode. The light changes in the wide-angle mode. In the anti-peep mode, the oblique light emitted from a display module 10 will be controlled by a first liquid crystal unit 21A and a first circular polarizer 22A in the viewing angle module 20. function, it is eventually reflected by a first polarizing plate 23 and cannot be emitted from the display surface of the touch display 1; and the ambient oblique light outside the touch display 1 is also reflected by the viewing angle control module 20. A second polarizing plate 24 , a second liquid crystal unit 21B and a second circular polarizing plate 22B are finally reflected by the first polarizing plate and emitted from the display surface of the touch display 1 .

For the user, when looking directly at the touch display 1, the user can see an image produced by the touch display 1, but when looking sideways at the touch display 1, the user cannot see the image. face to achieve the effect of preventing privacy. In the wide-angle mode, the forward light and oblique light emitted from the display module 10 will not be affected by the viewing angle control module 20, and can be emitted from the display surface of the touch display 1. For those located on the touch screen, Users in front of the touch display 1 can all see the image generated by the touch display 1, so that the touch display 1 has the function of being viewed by multiple people. In summary, the novel touch display with anti-peep mode can select the anti-peep mode or the wide-angle mode according to the user's needs, thereby increasing the flexibility of use of the touch display 1 .

The above description only describes the implementation modes or examples of the technical means used to solve the problems of the present invention, and is not intended to limit the scope of the patent implementation of the present invention. That is to say, all changes and modifications that are consistent with the literal meaning of the application scope of this new patent, or are equivalent changes and modifications made in accordance with the scope of this new patent, are covered by the scope of this new patent.

1:Touch display

10:Display module

20: Control viewing angle module

21:LCD unit

21A: First LCD unit

21B: Second LCD unit

22: Circular polarizer

22A: The first circular polarizer

22B: Second circular polarizer

23: First polarizer

24: Second polarizer

30:Touch module

40:Cover

Claims (10)

A touch display with anti-peep mode and wide-angle mode, including: A display module used to generate a first oblique linearly polarized light; A viewing angle control module is provided on the upper surface of the display module and includes: A first liquid crystal unit, arranged on the upper surface of the display module; a first circularly polarizing plate disposed on the upper surface of the first liquid crystal unit; a first polarizing plate disposed on the upper surface of the first circularly polarizing plate; a second circularly polarizing plate disposed on the upper surface of the first polarizing plate; a second liquid crystal unit, disposed on the upper surface of the second circularly polarizing plate; a second polarizing plate disposed on the upper surface of the second liquid crystal unit; A touch module is provided on the upper surface of the second polarizer; A cover plate is provided on the upper surface of the touch module to receive a first ambient oblique light; Wherein, when the touch display executes an anti-peep mode, the first liquid crystal unit and the second liquid crystal unit respectively receive a control bias voltage, and the control bias voltage can drive the first liquid crystal unit to switch to receive the first oblique direction. The linearly polarized light is a first circularly polarized light. The first circularly polarized light is converted into a second obliquely linearly polarized light by the first circularly polarized plate. The second obliquely linearly polarized light is affected by the first polarizing plate. And reflected in the direction of the display module; the second polarizer converts the ambient oblique light into a third oblique linear polarization, and the control bias can drive the second liquid crystal unit to convert the third oblique linear polarization The light is a second circularly polarized light. The second circularly polarized light is converted into a fourth oblique linearly polarized light by the second circularly polarizing plate. The fourth oblique linearly polarized light is directed toward the first polarizing plate by the action of the first polarizing plate. The cover plate is reflective; When the touch display executes a wide-angle mode, the first liquid crystal unit and the second liquid crystal unit do not receive the control bias, and the first oblique linearly polarized light can be emitted from the cover. The touch display with anti-peep mode and wide-angle mode as claimed in claim 1, wherein the first polarizer is a reflective polarizer. The touch display with anti-peep mode and wide-angle mode as claimed in claim 1, wherein the second polarizing plate is a linear polarizing plate. The touch display with anti-peep mode and wide-angle mode as claimed in claim 1, wherein each of the first liquid crystal unit and the second liquid crystal unit is a liquid crystal display filled with birefringent material. The touch display with anti-peep mode and wide-angle mode as described in claim 1, wherein the first circularly polarizing plate and the second circularly polarizing plate are respectively a phase retardation plate. A module for controlling the viewing angle, including: a first liquid crystal unit; a first circularly polarizing plate disposed on the upper surface of the first liquid crystal unit; a first polarizing plate disposed on the upper surface of the first circularly polarizing plate; a second circularly polarizing plate disposed on the upper surface of the first polarizing plate; a second liquid crystal unit, disposed on the upper surface of the second circularly polarizing plate; a second polarizing plate disposed on the upper surface of the second liquid crystal unit; Wherein, when the first liquid crystal unit and the second liquid crystal unit respectively receive a control bias voltage, the control bias voltage can drive the first liquid crystal unit to convert a first oblique linearly polarized light into a first circularly polarized light, The first circularly polarized light is converted into a second obliquely linearly polarized light by the first circularly polarizing plate, and the second obliquely linearly polarized light is reflected by the first polarizing plate; the second polarizing plate converts an environment The oblique light is a third oblique linearly polarized light. The control bias can drive the second liquid crystal unit to convert the third obliquely linearly polarized light into a second circularly polarized light. The second circularly polarized light passes through the third obliquely linearly polarized light. The two circular polarizers convert a fourth oblique linearly polarized light, and the fourth obliquely linearly polarized light is reflected by the first polarizer; when the first liquid crystal unit and the second liquid crystal unit do not receive the control bias voltage When the first obliquely linearly polarized light can be emitted from the first liquid crystal unit to the second polarizing plate. The viewing angle control module of claim 6, wherein the first polarizer is a reflective polarizer. The viewing angle control module of claim 6, wherein the second polarizing plate is a linear polarizing plate. The viewing angle control module of claim 6, wherein each of the first liquid crystal unit and the second liquid crystal unit is a liquid crystal display filled with birefringent material. The viewing angle control module of claim 6, wherein the first circularly polarizing plate and the second circularly polarizing plate are respectively a phase retarder.