CN113900288A - Display device and control method - Google Patents
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- CN113900288A CN113900288A CN202111178376.8A CN202111178376A CN113900288A CN 113900288 A CN113900288 A CN 113900288A CN 202111178376 A CN202111178376 A CN 202111178376A CN 113900288 A CN113900288 A CN 113900288A
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- 210000002858 crystal cell Anatomy 0.000 claims description 28
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- 238000005516 engineering process Methods 0.000 description 2
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
- G02F1/13318—Circuits comprising a photodetector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a display device and a control method, wherein the control method comprises the following steps: acquiring a first wide and narrow visual angle switching signal of a display liquid crystal box and a second wide and narrow visual angle switching signal of a dimming box; judging whether the first wide and narrow visual angle switching signal and the second wide and narrow visual angle switching signal are narrow visual angle switching signals or not; when the first wide-narrow visual angle switching signal and the second wide-narrow visual angle switching signal are both narrow visual angle switching signals, detecting the ambient light brightness information, and judging whether the ambient light brightness is smaller than a preset brightness value according to the ambient light brightness information; when the ambient light brightness is smaller than a preset brightness value, controlling the dimming box and the display liquid crystal box to display in a narrow viewing angle mode; and when the ambient light brightness is not less than the preset brightness value, controlling the dimming box to display in a narrow viewing angle mode, and controlling the display liquid crystal box to display in a wide viewing angle mode. The wide and narrow viewing angle modes of the dimming box and the display liquid crystal box are controlled according to the ambient light brightness, so that the requirements of different consumers on the narrow viewing angle display effect under different brightness all day are met.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a control method.
Background
With the continuous progress of the liquid crystal display technology, the visual angle of the display has been widened from about 112 ° to over 122 °, and people want to effectively protect business confidentiality and personal privacy while enjoying visual experience brought by a large visual angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. Therefore, in addition to the requirement of wide viewing angle, in many cases, the display device is required to have the function of switching between wide and narrow viewing angles.
At present, the wide and narrow visual angle switching is realized by mainly attaching the shutter shielding film on the display screen, when peep prevention is needed, the visual angle can be reduced by shielding the screen by using the shutter shielding film, but the shutter shielding film needs to be prepared additionally in the mode, great inconvenience can be caused to a user, and one shutter shielding film can only realize one visual angle. Once the louver shielding film is attached, the viewing angle is fixed in the narrow viewing angle mode, free switching between the wide viewing angle mode and the narrow viewing angle mode cannot be performed, and the brightness is reduced by the peep-proof sheet, so that the display effect is influenced.
In the prior art, a vertical electric field is applied to liquid crystal molecules by using a viewing angle control electrode on one side of a Color Filter (CF) substrate, so that liquid crystals deflect in a vertical direction, and a narrow viewing angle mode is realized. By controlling the voltage on the viewing angle control electrode, switching between a wide viewing angle and a narrow viewing angle can be achieved.
However, the existing display device can only fix one display effect under a narrow viewing angle, cannot adjust the narrow viewing angle display effect according to the intensity of ambient light, and cannot adapt to different requirements of different groups on the narrow viewing angle display effect.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides a display device and a control method thereof, so as to solve the problem that the display effect of a narrow viewing angle cannot be adjusted according to the intensity of ambient light in the prior art.
The purpose of the invention is realized by the following technical scheme:
the invention provides a control method of a display device, and provides the display device, wherein the display device comprises a dimming box and a display liquid crystal box which is arranged in a stacking manner with the dimming box, and the dimming box and the display liquid crystal box can realize wide and narrow visual angle mode switching;
the control method comprises the following steps:
acquiring a first wide and narrow visual angle switching signal of the display liquid crystal box and a second wide and narrow visual angle switching signal of the dimming box;
judging whether the first wide and narrow visual angle switching signal and the second wide and narrow visual angle switching signal are narrow visual angle switching signals or not;
when the first wide-narrow visual angle switching signal and the second wide-narrow visual angle switching signal are both narrow visual angle switching signals, detecting environment brightness information, and judging whether the environment brightness is smaller than a preset brightness value according to the environment brightness information;
when the ambient light brightness is smaller than a preset brightness value, controlling the dimming box and the display liquid crystal box to display in a narrow viewing angle mode; and when the ambient light brightness is not less than a preset brightness value, controlling the dimming box to display in a narrow viewing angle mode, and controlling the display liquid crystal box to display in a wide viewing angle mode.
Further, the control method further includes:
and when the first wide-narrow visual angle switching signal is a narrow visual angle switching signal and the second wide-narrow visual angle switching signal is a wide visual angle switching signal, or when the first wide-narrow visual angle switching signal and the second wide-narrow visual angle switching signal are both wide visual angle switching signals, controlling the dimming box and the display liquid crystal box to display in a wide visual angle mode.
Further, the control method further includes:
when the first wide-narrow visual angle switching signal is a wide visual angle switching signal and the second wide-narrow visual angle switching signal is a narrow visual angle switching signal, the dimming box is controlled to display a narrow visual angle mode, and the display liquid crystal box displays a wide visual angle mode.
Further, the preset brightness value is 25lux to 100 lux.
Furthermore, the light adjusting box comprises a first substrate, a second substrate arranged opposite to the first substrate and a first liquid crystal layer arranged between the first substrate and the second substrate, wherein a first visual angle control electrode is arranged on one side of the first substrate facing the first liquid crystal layer, and a second visual angle control electrode matched with the first visual angle control electrode is arranged on one side of the second substrate facing the first liquid crystal layer;
applying a first electric signal to one of the first viewing angle control electrode and the second viewing angle control electrode and applying a second electric signal to the other of the first viewing angle control electrode and the second viewing angle control electrode; when the light modulation box is in a narrow visual angle mode, the voltage difference between the first electric signal and the second electric signal is greater than a first preset voltage value; when the light modulation box is in the wide visual angle mode, the voltage difference between the first electric signal and the second electric signal is smaller than a second preset voltage value.
Further, the first electrical signal is a dc voltage signal, the second electrical signal is an ac voltage signal fluctuating up and down with the dc voltage signal as a center, and when the light modulation box is in the wide view angle mode, the pulse width of the second electrical signal is 1/3 frames.
Furthermore, the display liquid crystal box comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a second liquid crystal layer positioned between the color film substrate and the array substrate, wherein a common electrode is arranged on one side of the array substrate facing the second liquid crystal layer, and a third visual angle control electrode matched with the common electrode is arranged on one side of the color film substrate facing the second liquid crystal layer;
applying a third electric signal to the common electrode and a fourth electric signal to the third viewing angle control electrode; when the display liquid crystal box is in a narrow viewing angle mode, the voltage difference between the third electric signal and the fourth electric signal is greater than a third preset voltage value; when the display liquid crystal box is in a wide visual angle mode, the voltage difference between the third electric signal and the fourth electric signal is smaller than a fourth preset voltage value.
Further, when the display liquid crystal box is in the narrow viewing angle mode, the third electrical signal is a direct current voltage signal, and the fourth electrical signal is an alternating current voltage signal which fluctuates up and down with the direct current voltage signal as a center.
Furthermore, a fourth viewing angle control electrode matched with the common electrode is arranged on one side of the color film substrate facing the second liquid crystal layer, and the third viewing angle control electrode and the fourth viewing angle control electrode are strip-shaped electrodes and are alternately arranged;
and applying a fifth electric signal to the fourth viewing angle control electrode, wherein when the display liquid crystal box is in a narrow viewing angle mode, the fifth electric signal and the fourth electric signal have the same amplitude, the same period and opposite polarity.
The invention also provides a display device which is controlled by the control method, and comprises a dimming box, a display liquid crystal box, a front end system, a microcontroller, a voltage control module and an ambient light sensor, wherein the front end system, the voltage control module and the ambient light sensor are all electrically connected with the microcontroller, the dimming box and the display liquid crystal box are all electrically connected with the voltage control module, the dimming box and the display liquid crystal box are arranged in a stacked manner, the dimming box and the display liquid crystal box can realize wide-narrow visual angle mode switching, the front end system is used for acquiring a first wide-narrow visual angle switching signal of the display liquid crystal box and a second wide-narrow visual angle switching signal of the dimming box, the ambient light sensor is used for detecting ambient light brightness information, and the microcontroller is used for processing the first wide-narrow visual angle switching signal, the second wide-narrow visual angle switching signal and the ambient light brightness information and controlling the voltage control module to apply the dimming box, the ambient light brightness information and the ambient light brightness information The light box and the display liquid crystal box are electrically connected.
The invention has the beneficial effects that: the wide and narrow visual angle modes of the dimming box and the display liquid crystal box are controlled by the wide and narrow visual angle switching signals of the dimming box and the display liquid crystal box and the ambient light brightness, so that different narrow visual angle effects are realized under the condition of different ambient light brightness of the display device, and the requirements of different consumers on the narrow visual angle display effects under different brightness all day are met.
Drawings
FIG. 1 is a schematic flow chart of a control method according to the present invention;
FIG. 2 is a schematic circuit diagram of a display device according to the present invention;
FIG. 3 is a waveform diagram of a first signal and a second signal when the display device of the present invention is in a wide viewing angle;
FIG. 4 is a schematic diagram of a display device according to the present invention;
FIG. 5 is a waveform diagram of a first signal and a second signal when the display device of the present invention is at a first narrow viewing angle;
FIG. 6 is a schematic view of the display device of the present invention at a first narrow viewing angle;
FIG. 7 is a signal waveform diagram of a first signal and a second signal when the display device of the present invention is at a second narrow viewing angle;
FIG. 8 is a waveform diagram of a third signal, a fourth signal and a fifth signal of the display device of the present invention at a second narrow viewing angle;
fig. 9 is a schematic structural view of the display device of the present invention at a second narrow viewing angle.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made of specific embodiments, structures, features and effects of the display device and the control method according to the present invention with reference to the accompanying drawings and preferred embodiments, wherein:
fig. 1 is a schematic flow chart of a control method according to the present invention, fig. 2 is a schematic circuit diagram of a display device according to the present invention, fig. 3 is a schematic waveform diagram of a first signal and a second signal of the display device according to the present invention at a wide viewing angle, fig. 4 is a schematic configuration diagram of the display device according to the present invention at a wide viewing angle, fig. 5 is a schematic waveform diagram of the first signal and the second signal of the display device according to the present invention at a first narrow viewing angle, fig. 6 is a schematic configuration diagram of the display device according to the present invention at a first narrow viewing angle, fig. 7 is a schematic waveform diagram of the first signal and the second signal of the display device according to the present invention at a second narrow viewing angle, fig. 8 is a schematic waveform diagram of a third signal, a fourth signal, and a fifth signal of the display device according to the present invention at a second narrow viewing angle, and fig. 9 is a schematic configuration diagram of the display device according to the present invention at a second narrow viewing angle.
As shown in fig. 2, the display device provided by the present invention includes a dimming box 10, a display liquid crystal box 20, a front end system 1, a microcontroller 2, a voltage control module 3, and an ambient light sensor 4, wherein the front end system 1, the voltage control module 3, and the ambient light sensor 4 are electrically connected to the microcontroller 2, and the dimming box 10 and the display liquid crystal box 20 are electrically connected to the voltage control module 3. The dimming cell 10 and the display liquid crystal cell 20 are stacked, and both the dimming cell 10 and the display liquid crystal cell 20 can realize wide and narrow viewing angle mode switching. The front-end system 1 is used to obtain a first wide-narrow viewing angle switching signal HVA1 for the liquid crystal cell 20 and a second wide-narrow viewing angle switching signal HVA2 for the light modulation cell 10. The ambient light sensor 4 is used to detect ambient light brightness information. The microcontroller 2 is configured to process the first and second switching signals HVA1 and HVA2 and the ambient light brightness information and control the electrical signals applied to the dimming cell 10 and the display liquid crystal cell 20 by the voltage control module 3.
Further, the display device further includes an amplifying circuit 5 and a timing controller 6(TCON), the timing controller 6 is electrically connected to the microcontroller 2, and the timing controller 6 can provide timing signals, image signals and wide and narrow viewing angle driving signals to the gate driver, the source driver and the viewing angle driver according to the data signals to perform image display. The voltage control module 3 is electrically connected to the light modulation box 10 and the display liquid crystal box 20 through the amplifying circuit 5, and the amplifying circuit 5 is used for amplifying the electric signals applied to the light modulation box 10 and the display liquid crystal box 20 so as to drive the liquid crystal molecules to deflect.
The model of the voltage control module 3 is, for example, LM8342, the microcontroller 2 and the voltage control module 3 are connected by an I2C bus, and data is transmitted to the voltage control module 3 through an I2C, so as to change waveforms output to the dimming cell 10 and the display liquid crystal cell 20. The I2C (Inter-Integrated Circuit) bus is a simple, bi-directional two-wire synchronous serial bus developed by Philips corporation. It requires only two wires to transfer information between devices connected to the bus. For a more detailed circuit connection structure of the display device, please refer to the prior art, which is not described herein.
In this embodiment, the light modulation box 10 is disposed above the display liquid crystal box 20, a first polarizer 31 is disposed between the light modulation box 10 and the display liquid crystal box 20, a second polarizer 32 is disposed on one side of the display liquid crystal box 20 away from the light modulation box 10, a third polarizer 33 is disposed on one side of the light modulation box 10 away from the display liquid crystal box 20, and light transmission axes of the second polarizer 32 are perpendicular to light transmission axes of the first polarizer 31 and the third polarizer 33, respectively. Of course, the light modulation cell 10 may be disposed below the display liquid crystal cell 20.
The light modulation box 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a first liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12, wherein the first substrate 11 is provided with a first viewing angle control electrode 111 on a side facing the first liquid crystal layer 13, and the second substrate 12 is provided with a second viewing angle control electrode 121 cooperating with the first viewing angle control electrode 111 on a side facing the first liquid crystal layer 13. In this embodiment, the liquid crystal molecules in the first liquid crystal layer 13 adopt positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), and in the initial state, the positive liquid crystal molecules in the first liquid crystal layer 13 are aligned parallel to the first substrate 11 and the second substrate 12, so that the light modulation cell 10 has a wide viewing angle display effect in the initial state. Of course, in other embodiments, negative liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy) can be used as the liquid crystal molecules in the first liquid crystal layer 13, and the negative liquid crystal molecules in the first liquid crystal layer 13 are aligned in an inclined posture, that is, the negative liquid crystal molecules in the first liquid crystal layer 13 have a certain pretilt angle (for example, 60 ° to 70 °) in the initial state, so that the light modulation cell 10 has a narrow viewing angle display effect in the initial state.
The display liquid crystal cell 20 includes a color filter substrate 21, an array substrate 22 disposed opposite to the color filter substrate 21, and a second liquid crystal layer 23 located between the color filter substrate 21 and the array substrate 22. The alignment direction of the second liquid crystal layer 23 and the alignment direction of the first liquid crystal layer 13 are perpendicular to each other. The color filter substrate 21 is provided with a third viewing angle control electrode 213 on a side facing the second liquid crystal layer 23, and the array substrate 22 is provided with a common electrode 221 and a pixel electrode 222 on a side facing the second liquid crystal layer 23. In this embodiment, the liquid crystal molecules in the second liquid crystal layer 23 adopt positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), as shown in fig. 1, in the initial state, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color film substrate 21 and the array substrate 22, so that the display liquid crystal cell 20 has a wide viewing angle display effect in the initial state. Of course, in other embodiments, the liquid crystal molecules in the second liquid crystal layer 23 may also adopt negative liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy), and the negative liquid crystal molecules in the second liquid crystal layer 23 are aligned in an inclined posture, that is, the negative liquid crystal molecules in the second liquid crystal layer 23 have a certain pretilt angle (for example, 60 ° to 70 °) in the initial state, so that the display liquid crystal cell 20 has a narrow viewing angle display effect in the initial state.
In this embodiment, the color filter substrate 21 is provided with a fourth viewing angle control electrode 214 matched with the common electrode 221 on a side facing the second liquid crystal layer 23, the third viewing angle control electrode 213 and the fourth viewing angle control electrode 214 are both strip electrodes and are alternately arranged, and the third viewing angle control electrode 213 and the fourth viewing angle control electrode 214 are applied with electrical signals having the same amplitude, the same period, and opposite polarities, so as to avoid a voltage on the second viewing angle control electrode 121 in the polarization pulling and shifting light modulation box 10, so that the narrow viewing angle effect is better. Of course, in other embodiments, the third viewing angle control electrode 213 may be a planar electrode entirely covering the color filter substrate 21, so that the fourth viewing angle control electrode 214 is not required to be provided.
Further, the color filter substrate 21 is provided with color resist layers 212 arranged in an array and a black matrix 211 separating the color resist layers 212, and the color resist layers 212 include color resist materials of three colors of red (R), green (G), and blue (B), and sub-pixels of three colors of red (R), green (G), and blue (B) are correspondingly formed.
The array substrate 22 defines a plurality of pixel units on a side facing the second liquid crystal layer 23 by a plurality of scan lines and a plurality of data lines insulated from and crossing each other, a pixel electrode 222 and a thin film transistor are provided in each pixel unit, and the pixel electrode 222 is electrically connected to the data line of the adjacent thin film transistor through the thin film transistor. The thin film transistor includes a gate electrode, an active layer, and a drain electrode, wherein the gate electrode and the scan line are located in the same layer and electrically connected, the gate electrode and the active layer are isolated by an insulating layer, the source electrode and the data line are electrically connected, and the drain electrode and the pixel electrode 222 are electrically connected through a contact hole.
As shown in fig. 4, in the present embodiment, a common electrode 221 is further disposed on a side of the array substrate 22 facing the second liquid crystal layer 23, and the common electrode 221 and the pixel electrode 222 are located at different layers and insulated and isolated by an insulating layer. The common electrode 221 may be located above or below the pixel electrode 222 (the common electrode 221 is located below the pixel electrode 222 in fig. 1). Preferably, the common electrode 221 is a planar electrode disposed over the entire surface, and the pixel electrode 222 is a block electrode disposed in one block in each pixel unit or a slit electrode having a plurality of electrode bars to form a Fringe Field Switching (FFS) mode. Of course, In other embodiments, the pixel electrode 222 and the common electrode 221 may be located on the same layer, but they are insulated from each other, each of the pixel electrode 222 and the common electrode 221 may include a plurality of electrode strips, and the electrode strips of the pixel electrode 222 and the electrode strips of the common electrode 221 are alternately arranged to form an In-Plane Switching (IPS) mode; alternatively, in other embodiments, the array substrate 22 is provided with the pixel electrode 222 on a side facing the second liquid crystal layer 23, and the color filter substrate 21 is provided with the common electrode 221 on a side facing the second liquid crystal layer 23 to form a TN mode or a VA mode, and for other descriptions of the TN mode and the VA mode, reference is made to the prior art, and details are not repeated here.
The first substrate 11, the second substrate 12, the color filter substrate 21, and the array substrate 22 may be made of glass, acrylic, polycarbonate, or other materials. The materials of the first viewing angle controlling electrode 111, the second viewing angle controlling electrode 121, the third viewing angle controlling electrode 213, the fourth viewing angle controlling electrode 214, the common electrode 221, and the pixel electrode 222 may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or the like.
As shown in fig. 1, the present invention also provides a control method of a display apparatus, the control method being used for the display apparatus as described above, the control method comprising:
the first wide and narrow viewing angle switching signal HVA1 of the display liquid crystal cell 20 and the second wide and narrow viewing angle switching signal HVA2 of the light modulation cell 10 are acquired. Specifically, referring to fig. 2, by acquiring a first wide and narrow viewing angle switching signal HVA1 of display liquid crystal cell 20 and a second wide and narrow viewing angle switching signal HVA2 of light modulation cell 10 through front-end system 1, display liquid crystal cell 20 may be controlled to switch between a wide viewing angle mode and a narrow viewing angle mode according to first wide and narrow viewing angle switching signal HVA1, and light modulation cell 10 may be controlled to switch between a wide viewing angle mode and a narrow viewing angle mode according to second wide and narrow viewing angle switching signal HVA 2.
Whether the first HVA1 and the second HVA2 are narrow view switching signals is determined. Specifically, it is first determined whether the first HVA1 signal is a narrow switching signal, and when the first HVA1 signal is high, it is corresponding to the narrow switching signal, and when the first HVA1 signal is low, it is corresponding to the wide switching signal. Then, whether the second narrow and wide viewing angle switching signal HVA2 is a narrow viewing angle switching signal is determined, and when the second narrow and wide viewing angle switching signal HVA2 is at a high level, it is corresponding to a narrow viewing angle switching signal, and when the second narrow and wide viewing angle switching signal HVA2 is at a low level, it is corresponding to a wide viewing angle switching signal. Of course, in other embodiments, it may be determined whether the second HVA2 signal is a narrow switching signal, and then whether the first HVA1 signal is a narrow switching signal;
further, when the first wide-narrow viewing angle switching signal HVA1 and the second wide-narrow viewing angle switching signal HVA2 are both narrow viewing angle switching signals, detecting the ambient light brightness information, and determining whether the ambient light brightness is less than a preset brightness value according to the ambient light brightness information. Specifically, when the first wide-narrow viewing angle switching signal HVA1 and the second wide-narrow viewing angle switching signal HVA2 are both narrow viewing angle switching signals, the ambient light sensor 4 detects ambient light luminance information, and determines whether the ambient light luminance is less than a preset luminance value according to the ambient light luminance information. Wherein the preset brightness value is 25lux-100lux, preferably 50 lux;
when the ambient light brightness is less than the preset brightness value, controlling the dimming box 10 and the display liquid crystal box 20 to display in a narrow viewing angle mode; when the ambient light brightness is not less than the preset brightness value, the dimming cell 10 is controlled to display in the narrow viewing angle mode, and the display liquid crystal cell 20 is controlled to display in the wide viewing angle mode.
Specifically, when the first and second narrow-and-wide viewing angle switching signals HVA1 and HVA2 are both narrow-and-wide viewing angle switching signals, and the ambient light brightness is not less than a preset brightness value (≧ 50lux), the microcontroller 2 controls the voltage control module 3 to apply the narrow-and-wide viewing angle electrical signal to the light modulation box 10 and apply the wide-and-wide viewing angle electrical signal to the display liquid crystal box 20. Referring to fig. 5 and 6, a first electrical signal V11 is applied to one of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a second electrical signal V12 is applied to the other of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a voltage difference between the first electrical signal V11 and the second electrical signal V12 is greater than a first preset voltage value (e.g., 3V), for example, the first electrical signal V11 is a dc voltage signal (0V), and the second electrical signal V12 is an ac voltage signal (4.5-6V, preferably 5V) fluctuating up and down with the dc voltage signal as a center. So that a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 (E2 in fig. 6), and the positive liquid crystal molecules in the first liquid crystal layer 13 rotate in the vertical direction, at this time, the display panel appears dark when viewed from a large viewing angle, and the light modulation cell 10 is in a narrow viewing angle mode. And the third electrical signal V21 is applied to the common electrode 221, the fourth electrical signal V22 is applied to the third viewing angle control electrode 213, and the fifth electrical signal V23 is applied to the fourth viewing angle control electrode 214, a voltage difference between the third electrical signal V21 and the fourth electrical signal V22 is less than a fourth preset voltage value (e.g., 1V), and a voltage difference between the third electrical signal V21 and the fifth electrical signal V23 is less than a fourth preset voltage value (e.g., 1V). For example, the third electrical signal V21, the fourth electrical signal V22, and the fifth electrical signal V23 are all dc voltage signals (0V), so that a vertical electric field is not substantially formed between the color filter substrate 21 and the array substrate 22, and at this time, the liquid crystal display cell 20 is in a wide viewing angle mode. When the light modulation cell 10 is in the narrow viewing angle mode and the liquid crystal display cell 20 is in the wide viewing angle mode, the display device always presents a first narrow viewing angle display.
When the first wide-narrow viewing angle switching signal HVA1 and the second wide-narrow viewing angle switching signal HVA2 are both narrow viewing angle switching signals and the ambient light brightness is less than the preset brightness value (<50lux), the microcontroller 2 controls the voltage control module 3 to apply the narrow viewing angle electrical signals to the light modulation box 10 and the display liquid crystal box 20, and the narrow viewing angle electrical signals are amplified by the amplifying circuit 5 and then act on the light modulation box 10 and the display liquid crystal box 20. Referring to fig. 7 to 9, a first electrical signal V11 is applied to one of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a second electrical signal V12 is applied to the other of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a voltage difference between the first electrical signal V11 and the second electrical signal V12 is greater than a first preset voltage value (e.g., 3V), for example, the first electrical signal V11 is a dc voltage signal (0V), and the second electrical signal V12 is an ac voltage signal (4.5-6V, preferably 5.2V) fluctuating up and down around the dc voltage signal. So that a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 (E2 in fig. 9), and the positive liquid crystal molecules in the first liquid crystal layer 13 rotate in the vertical direction, at this time, the display panel appears dark when viewed from a large viewing angle, and the light modulation cell 10 is in a narrow viewing angle mode. And the third electrical signal V21 is applied to the common electrode 221, the fourth electrical signal V22 is applied to the third viewing angle control electrode 213, and the fifth electrical signal V23 is applied to the fourth viewing angle control electrode 214, a voltage difference between the third electrical signal V21 and the fourth electrical signal V22 is greater than a third preset voltage value (e.g., 2V), and a voltage difference between the third electrical signal V21 and the fifth electrical signal V23 is greater than a third preset voltage value (e.g., 2V). For example, the third electrical signal V21 is a dc voltage signal (0V), the fourth electrical signal V22 is an ac voltage signal that fluctuates up and down with the dc voltage signal as the center, the fourth electrical signal V22 and the fifth electrical signal V23 have the same amplitude, the same period, and opposite polarity, and the fourth electrical signal V22 and the fifth electrical signal V23 are both 2-4V, preferably 2.5V, so that a strong vertical electric field (E3 and E4 in fig. 9) is formed between the color film substrate 21 and the array substrate 22, and at this time, the liquid crystal cell 20 is displayed in a narrow viewing angle mode. Of course, the third electrical signal V21 may also be a dc voltage signal (e.g. 2.7V) with a certain amplitude, and the fourth electrical signal V22 and the fifth electrical signal V23 are ac voltage signals fluctuating up and down around the center of the third electrical signal V21, and the voltage difference between the third electrical signal V21 is 2-4V. When both the light modulating cell 10 and the display liquid crystal cell 20 are in the narrow viewing angle mode, the display device always appears as a second narrow viewing angle display.
Further, when the first narrow-and-wide viewing angle switching signal HVA1 is a narrow viewing angle switching signal and the second narrow-and-wide viewing angle switching signal HVA2 is a wide viewing angle switching signal, or when both the first narrow-and-wide viewing angle switching signal HVA1 and the second narrow-and-wide viewing angle switching signal HVA2 are wide viewing angle switching signals, both the light modulation box 10 and the display liquid crystal box 20 are controlled to display in the wide viewing angle mode. That is, as long as the second wide and narrow viewing angle switching signal is the wide viewing angle switching signal, both the dimming cell 10 and the display liquid crystal cell 20 are controlled to display the wide viewing angle mode. Since the narrow viewing angle effect of the light modulation cell 10 is better than that of the display liquid crystal cell 20, if only one liquid crystal cell is required to display the narrow viewing angle effect, the light modulation cell 10 is preferentially used to perform the narrow viewing angle display.
Specifically, as shown in fig. 3 and 4, a first electrical signal V11 is applied to one of the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a second electrical signal V12 is applied to the other of the first viewing angle control electrode 111 and the second viewing angle control electrode 121, a voltage difference between the first electrical signal V11 and the second electrical signal V12 is smaller than a second preset voltage value (e.g., 2V), for example, the first electrical signal V11 is a dc voltage signal (0V), and the second electrical signal V12 is an ac voltage signal (2-3V, preferably 2V) that fluctuates up and down about the dc voltage signal. So that a vertical electric field is not substantially formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121, and the dimming cell 10 is in a wide viewing angle mode. And the third electrical signal V21 is applied to the common electrode 221, the fourth electrical signal V22 is applied to the third viewing angle control electrode 213, and the fifth electrical signal V23 is applied to the fourth viewing angle control electrode 214, a voltage difference between the third electrical signal V21 and the fourth electrical signal V22 is less than a fourth preset voltage value (e.g., 1V), and a voltage difference between the third electrical signal V21 and the fifth electrical signal V23 is less than a fourth preset voltage value (e.g., 1V). For example, the third electrical signal V21, the fourth electrical signal V22, and the fifth electrical signal V23 are all dc voltage signals (0V), so that a vertical electric field is not substantially formed between the color filter substrate 21 and the array substrate 22, and at this time, the liquid crystal display cell 20 is in a wide viewing angle mode. When the light modulation cell 10 and the display liquid crystal cell 20 are both in the wide viewing angle mode, the display device always exhibits a wide viewing angle display.
Preferably, when the light box 10 is in the wide viewing angle mode, the pulse width of the second electrical signal V12 is 1/3 frames, so that the display device has better wide viewing angle display effect.
Further, when the first HVA1 signal is a wide viewing angle switching signal and the second HVA2 signal is a narrow viewing angle switching signal, the light modulation cell 10 is controlled to display a narrow viewing angle mode and the liquid crystal cell 20 is controlled to display a wide viewing angle mode. Referring to fig. 5 and 6, a first electrical signal V11 is applied to one of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a second electrical signal V12 is applied to the other of the first viewing angle controlling electrode 111 and the second viewing angle controlling electrode 121, a voltage difference between the first electrical signal V11 and the second electrical signal V12 is greater than a first preset voltage value (e.g., 3V), for example, the first electrical signal V11 is a dc voltage signal (0V), and the second electrical signal V12 is an ac voltage signal (4.5-6V, preferably 5V) fluctuating up and down with the dc voltage signal as a center. So that a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode 121 (E2 in fig. 6), and the positive liquid crystal molecules in the first liquid crystal layer 13 rotate in the vertical direction, at this time, the display panel appears dark when viewed from a large viewing angle, and the light modulation cell 10 is in a narrow viewing angle mode. And the third electrical signal V21 is applied to the common electrode 221, the fourth electrical signal V22 is applied to the third viewing angle control electrode 213, and the fifth electrical signal V23 is applied to the fourth viewing angle control electrode 214, a voltage difference between the third electrical signal V21 and the fourth electrical signal V22 is less than a fourth preset voltage value (e.g., 1V), and a voltage difference between the third electrical signal V21 and the fifth electrical signal V23 is less than a fourth preset voltage value (e.g., 1V). For example, the third electrical signal V21, the fourth electrical signal V22, and the fifth electrical signal V23 are all dc voltage signals (0V), so that a vertical electric field is not substantially formed between the color filter substrate 21 and the array substrate 22, and at this time, the liquid crystal display cell 20 is in a wide viewing angle mode. When the light modulation cell 10 is in the narrow viewing angle mode and the liquid crystal display cell 20 is in the wide viewing angle mode, the display device always presents a first narrow viewing angle display.
When the display device is in the first narrow viewing angle display mode, the second narrow viewing angle display mode and the wide viewing angle display mode, corresponding gray scale voltages are applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221, a horizontal electric field is generated (E1 in fig. 4), so that positive liquid crystal molecules in the second liquid crystal layer 23 are deflected in a direction parallel to the horizontal electric field in the horizontal direction, the gray scale voltages include 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, thereby displaying different pictures, so as to realize normal display of the display device in the first narrow viewing angle display mode, the second narrow viewing angle display mode and the wide viewing angle display mode.
In this document, the terms of upper, lower, left, right, front, rear and the like are used to define the positions of the structures in the drawings and the positions of the structures relative to each other, only for the sake of clarity and convenience in the 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. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A control method of a display device is characterized in that a display device is provided, the display device comprises a dimming box (10) and a display liquid crystal box (20) which is laminated with the dimming box (10), and the dimming box (10) and the display liquid crystal box (20) can realize wide and narrow visual angle mode switching;
the control method comprises the following steps:
acquiring a first wide and narrow visual angle switching signal of the display liquid crystal box (20) and a second wide and narrow visual angle switching signal of the dimming box (10);
judging whether the first wide and narrow visual angle switching signal and the second wide and narrow visual angle switching signal are narrow visual angle switching signals or not;
when the first wide-narrow visual angle switching signal and the second wide-narrow visual angle switching signal are both narrow visual angle switching signals, detecting environment brightness information, and judging whether the environment brightness is smaller than a preset brightness value according to the environment brightness information;
when the ambient light brightness is smaller than a preset brightness value, controlling the dimming box (10) and the display liquid crystal box (20) to display in a narrow viewing angle mode; when the ambient light brightness is not less than a preset brightness value, the dimming box (10) is controlled to display in a narrow viewing angle mode, and the display liquid crystal box (20) is controlled to display in a wide viewing angle mode.
2. The control method of a display device according to claim 1, characterized by further comprising:
and when the first wide and narrow visual angle switching signal is a narrow visual angle switching signal and the second wide and narrow visual angle switching signal is a wide visual angle switching signal, or when the first wide and narrow visual angle switching signal and the second wide and narrow visual angle switching signal are both wide visual angle switching signals, controlling the dimming box (10) and the display liquid crystal box (20) to display in a wide visual angle mode.
3. The control method of a display device according to claim 1, characterized by further comprising:
when the first wide-narrow viewing angle switching signal is a wide viewing angle switching signal and the second wide-narrow viewing angle switching signal is a narrow viewing angle switching signal, the dimming cell (10) is controlled to display a narrow viewing angle mode, and the display liquid crystal cell (20) is controlled to display a wide viewing angle mode.
4. The method of claim 1, wherein the predetermined brightness value is 25lux to 100 lux.
5. The method of claim 1, wherein the light modulating cell (10) comprises a first substrate (11), a second substrate (12) disposed opposite to the first substrate (11), and a first liquid crystal layer (13) disposed between the first substrate (11) and the second substrate (12), the first substrate (11) is provided with a first viewing angle control electrode (111) on a side facing the first liquid crystal layer (13), the second substrate (12) is provided with a second viewing angle control electrode (121) cooperating with the first viewing angle control electrode (111) on a side facing the first liquid crystal layer (13);
applying a first electric signal to one of the first viewing angle control electrode (111) and the second viewing angle control electrode (121), and applying a second electric signal to the other of the first viewing angle control electrode (111) and the second viewing angle control electrode (121); when the light modulation box (10) is in a narrow visual angle mode, the voltage difference between the first electric signal and the second electric signal is greater than a first preset voltage value; when the light modulation box (10) is in a wide view angle mode, the voltage difference between the first electric signal and the second electric signal is smaller than a second preset voltage value.
6. The method of claim 5, wherein the first electrical signal is a DC voltage signal, the second electrical signal is an AC voltage signal fluctuating up and down around the DC voltage signal, and the pulse width of the second electrical signal is 1/3 frames when the light box (10) is in the wide viewing angle mode.
7. The method according to claim 1, wherein the display liquid crystal cell (20) includes a color filter substrate (21), an array substrate (22) disposed opposite to the color filter substrate (21), and a second liquid crystal layer (23) disposed between the color filter substrate (21) and the array substrate (22), the array substrate (22) is provided with a common electrode (221) on a side facing the second liquid crystal layer (23), and the color filter substrate (21) is provided with a third viewing angle control electrode (213) cooperating with the common electrode (221) on a side facing the second liquid crystal layer (23);
applying a third electric signal to the common electrode (221), and applying a fourth electric signal to the third viewing angle control electrode (213); when the display liquid crystal box (20) is in a narrow visual angle mode, the voltage difference between the third electric signal and the fourth electric signal is greater than a third preset voltage value; when the display liquid crystal box (20) is in a wide visual angle mode, the voltage difference between the third electric signal and the fourth electric signal is smaller than a fourth preset voltage value.
8. The method according to claim 7, wherein when the display liquid crystal cell (20) is in the narrow viewing angle mode, the third electrical signal is a DC voltage signal, and the fourth electrical signal is an AC voltage signal fluctuating up and down with the DC voltage signal as a center.
9. The method according to claim 8, wherein a fourth viewing angle control electrode (214) is disposed on a side of the color filter substrate (21) facing the second liquid crystal layer (23) and is engaged with the common electrode (221), and the third viewing angle control electrode (213) and the fourth viewing angle control electrode (214) are both stripe electrodes and are alternately arranged;
and applying a fifth electric signal to the fourth viewing angle control electrode (213), wherein the fifth electric signal and the fourth electric signal have the same amplitude, the same period and opposite polarity when the display liquid crystal box (20) is in a narrow viewing angle mode.
10. A display device, characterized in that the display device is controlled by the control method according to any one of claims 1 to 9, the display device comprises a dimming cell (10), a display liquid crystal cell (20), a front-end system (1), a microcontroller (2), a voltage control module (3) and an ambient light sensor (4), the front-end system (1), the voltage control module (3) and the ambient light sensor (4) are electrically connected to the microcontroller (2), the dimming cell (10) and the display liquid crystal cell (20) are electrically connected to the voltage control module (3), the dimming cell (10) and the display liquid crystal cell (20) are stacked, the dimming cell (10) and the display liquid crystal cell (20) are capable of wide-narrow viewing angle mode switching, the front-end system (1) is configured to obtain a first wide-narrow viewing angle switching signal of the display liquid crystal cell (20) and a second wide-narrow viewing angle switching signal of the dimming cell (10), the ambient light sensor (4) is used for detecting ambient light brightness information, and the microcontroller (2) is used for processing the first wide and narrow visual angle switching signal, the second wide and narrow visual angle switching signal and the ambient light brightness information and controlling electric signals applied to the dimming box (10) and the display liquid crystal box (20) by the voltage control module (3).
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