CN213240732U - Writing display device - Google Patents
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- CN213240732U CN213240732U CN202021852007.3U CN202021852007U CN213240732U CN 213240732 U CN213240732 U CN 213240732U CN 202021852007 U CN202021852007 U CN 202021852007U CN 213240732 U CN213240732 U CN 213240732U
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Abstract
The utility model relates to a show technical field, disclose a writing display device. The writing display device comprises a display module and a writing module arranged on the light-emitting side of the display module; the writing module comprises a first transparent conducting layer, a first liquid crystal layer, a second transparent conducting layer and a first protective layer which are sequentially stacked on the light emergent side of the display module, wherein the first liquid crystal layer comprises cholesteric liquid crystal; write display device and have and write mode and display mode, under writing the mode, display module closes, writes the module and can change between transmission state and reflective state, and under display mode, display module's emergent light can penetrate and write and jet out behind the module. The embodiment of the utility model provides a write display device, the light-emitting side through locating the display module assembly with writing the module assembly not only can realize writing and show function in an organic whole, can also realize the mode of writing of low-power consumption through need not to open the display module assembly.
Description
Technical Field
The utility model belongs to the technical field of the display technology and specifically relates to a write display device is related to.
Background
Liquid Crystal Displays (LCDs) are widely used in various information and communication consumer products because of their advantages such as small size, high image quality, no radiation, and low driving voltage. In recent years, with the rapid development of the photoelectric industry, people have increasingly demanded functions for the wide use, development and research of electronic communication devices such as mobile phones, computers and tablet computers, wherein the demand for writing functions is also increasing.
In the prior art, a display device realizes a writing function through a touch function of the display device, generally needs to use a backlight source to provide brightness, and has high power consumption; moreover, a certain gap exists between the writing experience realized through the touch function and the paper writing experience; in addition, the conventional writing apparatus cannot realize a plurality of display modes.
SUMMERY OF THE UTILITY MODEL
The utility model provides a write display device to improve write display device write experience and reduce the consumption, still have different visual angle display effect under the display mode.
An embodiment of the utility model provides a write display device includes: the display module comprises a display module and a writing module arranged on the light-emitting side of the display module; the writing module comprises a first transparent conducting layer, a first liquid crystal layer, a second transparent conducting layer and a first protective layer which are sequentially stacked on the light emergent side of the display module, wherein the first liquid crystal layer comprises cholesteric liquid crystal; write display device and have and write mode and display mode, under writing the mode, display module assembly closes, write the module assembly and can change between transmission state and reflective state, under display mode, display module assembly's emergent light can see through jet out behind the writing module assembly, display mode includes wide visual angle display mode and narrow visual angle display mode.
Further, the cholesteric liquid crystal comprises a first zero field stable state and a second zero field stable state; and in a writing mode, the writing module is pressed, the cholesteric liquid crystal can be switched from the first zero-field stable state to the second zero-field stable state and is kept in the second zero-field stable state to form a writing trace, and when the difference of the instantaneous voltages applied to the first transparent conducting layer and the second transparent conducting layer is larger than a first preset value, the cholesteric liquid crystal can be switched from the second zero-field stable state to the first zero-field stable state under the action of an electric field and is kept in the first zero-field stable state to clear the writing trace.
Furthermore, the display module comprises a liquid crystal display panel and a backlight module located on the light incident side of the liquid crystal display panel, the writing module is located on one side, away from the backlight module, of the liquid crystal display panel, and the backlight module is in a closed state in a writing mode.
Further, the liquid crystal display panel comprises an array substrate, a color film substrate and a second liquid crystal layer clamped between the array substrate and the color film substrate; the writing module is located on one side, away from the second liquid crystal layer, of the color film substrate.
Furthermore, the array substrate comprises a first substrate, and a first electrode layer, an insulating layer and a second electrode layer which are sequentially stacked on the first substrate, wherein the first electrode layer is arranged on one side of the first substrate close to the second liquid crystal layer.
Further, when the display mode is the narrow viewing angle display mode, the first electrode layer and the second electrode layer in the display module are applied with working voltages, and a voltage difference value applied by the first transparent conductive layer and the second transparent conductive layer in the writing module is greater than or equal to a second preset voltage value and smaller than a third preset voltage value.
Further, when the display mode is the wide-viewing-angle display mode, working voltages are applied to the first electrode layer and the second electrode layer in the display module, a voltage difference value applied to the first transparent conductive layer and the second transparent conductive layer in the writing module is greater than or equal to a fourth preset voltage value, and the fourth preset voltage value is greater than or equal to the third preset voltage value.
Furthermore, the writing display device further comprises a first polaroid, a second polaroid and a third polaroid, wherein the first polaroid is positioned on one side, away from the writing module, of the display module, the second polaroid is positioned between the display module and the writing module, and the third polaroid is positioned on one side, away from the display module, of the writing module; and the transmission axis of the second polaroid is vertical to that of the first polaroid, and the transmission axis of the second polaroid is parallel to that of the third polaroid.
Further, the first protection layer is made of flexible plastic materials.
Further, write display device still includes the control unit, the control unit respectively with write the module and display module electric connection, control write display device be in write the mode with switch between the display mode.
The embodiment of the utility model provides a write display device, the light-emitting side through locating display module assembly with writing the module assembly not only can realize writing function and display function in an organic whole, need not to open display module assembly on the one hand, can realize the mode of writing of low-power consumption, and on the other hand still has the display mode at different visual angles.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention;
fig. 3 is a schematic view of the light path of the writing display device according to the embodiment of the present invention in the writing state;
fig. 4 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention when removing writing traces;
fig. 5 is a schematic diagram illustrating a screenshot of a writing display device in a narrow viewing angle display mode according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a screenshot of the writing display device according to the embodiment of the present invention in the wide viewing angle display mode.
Detailed Description
In order to further explain the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, but not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention; fig. 2 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention; fig. 3 is a schematic view of the light path of the writing display device according to the embodiment of the present invention in the writing state; fig. 4 is a schematic cross-sectional view of a writing display device according to an embodiment of the present invention when erasing handwriting.
As shown in fig. 1, a writing display device according to an embodiment of the present invention includes a display module and a writing module 100 disposed on a light-emitting side of the display module. The writing module 100 includes a first transparent conductive layer 150, a first liquid crystal layer 130, a second transparent conductive layer 120, and a first protection layer 110 sequentially stacked on the light-emitting side of the display module.
The first liquid crystal layer 130 has cholesteric liquid crystals 131, the cholesteric liquid crystals 131 including a first zero-field stable state and a second zero-field stable state, the cholesteric liquid crystals 131 exhibiting various states depending on a voltage applied thereto and a surface alignment layer. In the present embodiment, the first zero field steady state of the cholesteric liquid crystal 131 is a focal conic state (fc state), which can be understood as a transmissive state, and the second zero field steady state is a planar state (p state), which can be understood as a reflective state. The cholesteric liquid crystals 131 may also have a homeotropic (h-state) or homeotropic (field-induced) nematic phase; varying planar states (p-states). Of these states of cholesteric liquid crystals, only the p-state and the fc-state are stable in the absence of an external field; the h state exists only when there is an external field, and the p state is a plane-like state with a helical pitch, which mainly occurs in the process of transition of liquid crystal molecules from a vertical alignment state to a plane state.
Preferably, the first protective layer 110 may be made of transparent flexible plastic, and the writing experience is similar to paper writing, and the writing experience is good. Such as PET (Polyethylene terephthalate) plastic film.
The first transparent conductive layer 150 and the second transparent conductive layer 120 are used to drive the cholesteric liquid crystal 131 in the first liquid crystal layer 130 to change states. The first transparent conductive layer 150 and the second transparent conductive layer 120 may be made of ITO (Indium Tin oxide semiconductor transparent conductive film).
On the one hand, the embodiment of the utility model provides a writing display device has the mode of writing, and under the mode of writing, cholesteric liquid crystal 131 in first liquid crystal layer 130 can switch over to second zero field steady state and keep at second zero field steady state so as to form the writing trace from first zero field steady state, when applying instantaneous clear voltage to first transparent conducting layer 150 and second transparent conducting layer 120, this voltage difference is greater than first default, cholesteric liquid crystal 131 can switch over to first zero field steady state and keep at first zero field steady state in order to clear away the trace from second zero field steady state under the electric field effect. In addition, under the mode of writing, the display module assembly can be in the off state, makes it present the black state, can save the power consumption like this.
Specifically, referring to fig. 1 to 3, when the writing display device is in an initial state of the writing mode (i.e. a state where no pressure or voltage is applied), the cholesteric liquid crystal 131 in the first liquid crystal layer 130 is in a first zero-field stable state (a focal conic state), in which the external ambient light L1 can transmit the writing module 100, and the reflected light L2 is the color of the display module below the writing module 100. Since the display module is not powered at this time, the writing side of the writing display device is black.
When writing on the writing display device, the cholesteric liquid crystal 131 in the first liquid crystal layer 130 of the writing part is changed from the first zero-field stable state (focal conic state) to the second zero-field stable state (planar state), and the incident ambient light L1 in this state cannot pass through the writing part. Specifically, as shown in fig. 3, when the writing pen 300 presses on the first protective layer 110 of the writing module 100, the first protective layer 110 and the second transparent conductive layer 120 at the pressed position are deformed concavely, the cholesteric liquid crystal 131 in the first liquid crystal layer 130 at the pressed position of the writing pen 300 is converted from a focal conic state to a planar state, the incident ambient light L1 is reflected after passing through the surface of the writing module 100, and the wavelength of the reflected light L2 is equal to the pitch of the cholesteric liquid crystal 131 (for example, when the pitch of the cholesteric liquid crystal 131 is 560nm, the reflected light L2 is green, that is, the written portion will show a green writing trace, but not limited thereto, the pitch of the cholesteric liquid crystal 131 is adjustable). In the embodiment of the present invention, writing can be understood as pressing, and for the pressure applied by the writing module 100, the pressure makes the cholesteric liquid crystal 131 in the first liquid crystal layer 130 perform the transition of the stable state, and then the writing module 100 is realized to transition from the transmission state to the reflection state. It will be appreciated that the writing instrument may be used to write with a pen 300 as shown in FIG. 3, or may be used to write with a finger, or other suitable device.
When the writing trace needs to be removed, the first transparent conductive layer 150 and the second transparent conductive layer 120 are respectively applied with instantaneous voltages, and the application of the instantaneous voltages can be realized through an external circuit. When the instantaneous voltage difference V1 applied between the first transparent conductive layer 150 and the second transparent conductive layer 120 is greater than a first predetermined value (for example, 5V, but not limited thereto), the cholesteric liquid crystal in the first liquid crystal layer 130 is changed from a planar state to a focal conic state and stabilized in the focal conic state at the pressed position, as shown in fig. 4, the writing module 100 is in a transmissive state again, at this time, the external ambient light L1 can transmit the writing module 100, and the reflected light L2 is the color of the display module below the writing module 100, i.e., is restored to the initial writing state.
The embodiment of the utility model provides a write display device because the writing trace under the mode of writing is the reflection of ambient light, consequently does not need the backlight, and the consumption is lower.
In another aspect, the embodiment of the present invention provides a writing display device, which further has a display mode. In the display mode, the emergent light of the display module can be emitted after passing through the writing module 100.
As shown in fig. 1, the display module includes a liquid crystal display panel 200 and a backlight module (not shown) located at a light incident side of the liquid crystal display panel, and the writing module 100 is located at a side of the liquid crystal display panel 200 away from the backlight module. In the writing mode, the display module is in a black state, and preferably, when the display module is in the black state, the image output and the backlight module of the liquid crystal display panel 200 are both in an off state, where the turning off of the image output means turning off a channel power supply related to the image output, so that power consumption can be greatly reduced.
The liquid crystal display panel 200 includes an array substrate, a color filter substrate 220, and a second liquid crystal layer 230 sandwiched between the array substrate and the color filter substrate 220; the writing module 100 is located on a side of the color film substrate 220 away from the second liquid crystal layer 230.
The color filter substrate 220 includes color groups and black matrixes (not shown) disposed at intervals, and the structure of the color filter substrate is common knowledge and therefore will not be described herein.
Further, the array substrate includes a first substrate 270, and a first electrode layer 260, an insulating layer 250 and a second electrode layer 240 sequentially stacked on the first substrate 270, wherein the first electrode layer 260 is disposed on a side of the first substrate 270 close to the second liquid crystal layer 230. The first electrode layer 260 may be a common electrode layer, and may be designed as a whole surface, and the second electrode layer 240 may be a pixel electrode, and may be designed as a stripe electrode, but is not limited thereto; in this embodiment, the pixel electrode is located above the common electrode, and an insulating layer is arranged between the pixel electrode and the common electrode at intervals; in other embodiments, the pixel electrode may also be located below the common electrode; when an in-plane switching (IPS) mode liquid crystal display device is used, the common electrode and the pixel electrode may be in the same layer and insulated from each other, and at this time, the common electrode and the pixel electrode may be respectively formed in a comb-like structure having a plurality of electrode stripes and inserted into each other.
The liquid crystal molecules may be generally positive liquid crystal molecules and negative liquid crystal molecules. In the present embodiment, it is preferable that the liquid crystal molecules in the second liquid crystal layer 230 are positive liquid crystal molecules because the positive liquid crystal molecules have an advantage of fast response. In an initial state (i.e., a state where no voltage is applied to the liquid crystal display panel 200), the positive liquid crystal molecules in the second liquid crystal layer 230 assume a lying posture substantially parallel to the first substrate 270, such that the long axis direction of the positive liquid crystal molecules is substantially parallel to the surface of the substrate 270 (see fig. 1). Due to the anchoring effect of the alignment film (not shown), the positive liquid crystal molecules of the liquid crystal display panel 200 can be maintained in the lying posture in an initial state where no voltage is applied. In practical applications, the positive liquid crystal molecules in the liquid crystal layer 230 and the first substrate 270 may have a small initial pretilt angle, and the initial pretilt angle may be within 10 °, i.e., 0 ° ≦ θ ≦ 10 °. Under the action of an electric field, the long axes of the positive liquid crystal molecules tend to deflect in a direction parallel to the direction of the electric field.
Further, the writing display device further includes a first polarizer 310, a second polarizer 320, and a third polarizer 330, the first polarizer 310 is located on one side of the display module away from the writing module 100, the second polarizer 320 is located between the display module and the writing module 100, and the third polarizer 330 is located on one side of the writing module 100 away from the display module. In the display mode, when the voltage control is applied to the display module, the polarization directions of the polarizers located at the two sides of the display module are required to be vertically arranged, and liquid crystal molecules in the liquid crystal display module are turned over, so that the light emitted by the backlight module passes through the vibration direction of the polarized light of the first polarizer 310 to rotate, and then passes through the second polarizer 320 and the third polarizer 330 to generate a transmittance difference, thereby realizing the modulation of the light transmittance. Therefore, it is preferable that the transmission axis of the second polarizer 320 is perpendicular to that of the first polarizer 310, and the transmission axis of the second polarizer 320 is parallel to that of the third polarizer 330. For example, when the transmission axis of the first polarizer is 90 °, the transmission axis of the second polarizer 320 and the transmission axis of the third polarizer 330 are 0 °.
Furthermore, a diffusion sheet (not shown) may be disposed between the writing module 100 and the display module, so that the display effect is more uniform.
In the present embodiment, the display mode may include a wide viewing angle display mode and a narrow viewing angle display mode.
Fig. 5 is a schematic diagram illustrating a screenshot of a writing display device in a narrow viewing angle display mode according to an embodiment of the present invention; fig. 6 is a schematic diagram of a screenshot of the writing display device according to the embodiment of the present invention in the wide viewing angle display mode.
Referring to fig. 5 and 6, in the display mode, an operating voltage V2 (e.g., an operating voltage range of 0-5V) is applied to the first electrode layer 260 and the second electrode layer 240 in the display module, so that a horizontal electric field is formed between the first electrode layer 260 and the second electrode layer 240, and liquid crystal molecules in the second liquid crystal layer 230 are deflected.
Referring to fig. 5, when the voltage difference V3 applied by the first transparent conductive layer 150 and the second transparent conductive layer 120 in the writing module 100 is smaller than the second predetermined value < V3 < the third predetermined value (where the second predetermined value is smaller than the third predetermined value, for example, but not limited to, the second predetermined value is 3V, and the third predetermined value is 8V), under the action of the vertical electric field, the cholesteric liquid crystal 131 in the first liquid crystal layer 130 exhibits an intermediate state (which may be referred to as a tilted state) that is a state that a focal conic state transits to a vertical state, i.e., an included angle formed by the cholesteric liquid crystal 131 intersecting with a transmission axis of the second polarizer 320 along a long axis direction thereof is an acute angle or an obtuse angle, so that in a screen oblique viewing direction of the display device, light passing through liquid crystal molecules exhibits a dark state due to phase retardation mismatch with the polarizers, and a viewing angle is reduced, thereby.
With reference to fig. 6, when the voltage difference V4 applied by the first transparent conductive layer 150 and the second transparent conductive layer 120 in the writing module 100 is greater than or equal to a fourth predetermined voltage value (wherein the fourth predetermined voltage value is set to be greater than or equal to the third predetermined voltage value, for example, the fourth predetermined voltage value may be set to be 8V, 9V, or 10V, etc.), the cholesteric liquid crystal 131 in the first liquid crystal layer 130 is in a vertical state, i.e., the long axis direction of the cholesteric liquid crystal 131 is perpendicular to the light transmission axes of the second polarizer 320 and the third polarizer 330, and the light transmission axis of the second polarizer 320 is parallel to the light transmission axis of the third polarizer 330, at this time, the birefringence of the cholesteric liquid crystal 131 in the first liquid crystal layer 130 disappears, at this time, the viewing angle is not reduced, and thus the display mode is the wide viewing angle display mode.
Further, write display device and still include the control unit, the control unit respectively with write module 100 and display module assembly electric connection, control write display device and write and switch between the mode and the display mode.
The embodiment of the utility model provides a write display device can realize writing function and demonstration function in an organic whole. The writing mode with low power consumption and the display mode with different visual angles are realized.
The foregoing is a complete disclosure of the present invention, and in this specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including other elements not expressly listed, in addition to those elements listed.
In the present specification, the terms of front, rear, upper, lower and the like are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A writing display device, comprising: the display module comprises a display module and a writing module arranged on the light-emitting side of the display module; the writing module comprises a first transparent conducting layer, a first liquid crystal layer, a second transparent conducting layer and a first protective layer which are sequentially stacked on the light emergent side of the display module, wherein the first liquid crystal layer comprises cholesteric liquid crystal; write display device and have and write mode and display mode, under writing the mode, display module assembly closes, write the module assembly and can change between transmission state and reflective state, under display mode, display module assembly's emergent light can see through jet out behind the writing module assembly, display mode includes wide visual angle display mode and narrow visual angle display mode.
2. A writing display device according to claim 1, wherein the cholesteric liquid crystal comprises a first zero field stable state and a second zero field stable state; and in a writing mode, the writing module is pressed, the cholesteric liquid crystal can be switched from the first zero-field stable state to the second zero-field stable state and is kept in the second zero-field stable state to form a writing trace, and when the difference of the instantaneous voltages applied to the first transparent conducting layer and the second transparent conducting layer is larger than a first preset value, the cholesteric liquid crystal can be switched from the second zero-field stable state to the first zero-field stable state under the action of an electric field and is kept in the first zero-field stable state to clear the writing trace.
3. The writing display device of claim 2, wherein the display module comprises a liquid crystal display panel and a backlight module located at a light incident side of the liquid crystal display panel, the writing module is located at a side of the liquid crystal display panel away from the backlight module, and in the writing mode, the backlight module is in an off state.
4. The writing display device of claim 3, wherein the liquid crystal display panel comprises an array substrate, a color film substrate and a second liquid crystal layer sandwiched between the array substrate and the color film substrate; the writing module is located on one side, away from the second liquid crystal layer, of the color film substrate.
5. The writing display device of claim 4, wherein the array substrate comprises a first substrate, and a first electrode layer, an insulating layer and a second electrode layer sequentially stacked on the first substrate, wherein the first electrode layer is disposed on a side of the first substrate close to the second liquid crystal layer.
6. The writing display device of claim 5, wherein when the display mode is the narrow viewing angle display mode, the first electrode layer and the second electrode layer of the display module are applied with a working voltage, and a difference between voltages applied to the first transparent conductive layer and the second transparent conductive layer of the writing module is greater than or equal to a second preset voltage value and less than a third preset voltage value.
7. The writing display device of claim 6, wherein when the display mode is the wide viewing angle display mode, the first electrode layer and the second electrode layer of the display module are applied with a working voltage, a voltage difference applied by the first transparent conductive layer and the second transparent conductive layer of the writing module is greater than or equal to a fourth preset voltage value, and the fourth preset voltage value is greater than or equal to the third preset voltage value.
8. The writing display device according to any one of claims 1 to 7, further comprising a first polarizer, a second polarizer and a third polarizer, wherein the first polarizer is located on the side of the display module away from the writing module, the second polarizer is located between the display module and the writing module, and the third polarizer is located on the side of the writing module away from the display module; and the transmission axis of the second polaroid is vertical to that of the first polaroid, and the transmission axis of the second polaroid is parallel to that of the third polaroid.
9. A writing display device according to claim 1, wherein the first protective layer is made of a flexible plastic material.
10. The writing display device of claim 1, further comprising a control unit, wherein the control unit is connected to the writing module and the display module respectively, and controls the writing display device to switch between the writing mode and the display mode.
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| CN202021852007.3U CN213240732U (en) | 2020-08-31 | 2020-08-31 | Writing display device |
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| CN202021852007.3U CN213240732U (en) | 2020-08-31 | 2020-08-31 | Writing display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142092A1 (en) * | 2022-01-29 | 2023-08-03 | 京东方科技集团股份有限公司 | Liquid crystal handwriting pad and manufacturing method therefor |
| CN117539086A (en) * | 2023-11-08 | 2024-02-09 | 浙江大学 | Light-control color-changing structure, device, system and method |
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2020
- 2020-08-31 CN CN202021852007.3U patent/CN213240732U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142092A1 (en) * | 2022-01-29 | 2023-08-03 | 京东方科技集团股份有限公司 | Liquid crystal handwriting pad and manufacturing method therefor |
| CN117539086A (en) * | 2023-11-08 | 2024-02-09 | 浙江大学 | Light-control color-changing structure, device, system and method |
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