CN111308745A - Display panel and display method of display device - Google Patents
Display panel and display method of display device Download PDFInfo
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- CN111308745A CN111308745A CN202010134921.2A CN202010134921A CN111308745A CN 111308745 A CN111308745 A CN 111308745A CN 202010134921 A CN202010134921 A CN 202010134921A CN 111308745 A CN111308745 A CN 111308745A
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- peep
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
Abstract
The invention provides a display panel and a display method of a display device, belongs to the technical field of display, and can solve the problems of low light-emitting rate and high power consumption of the conventional peep-proof display panel. The display method of the display panel comprises the following steps: when the display panel is in the peep-proof display mode, inputting a peep-proof signal to a peep-proof electrode of the display panel so as to enable liquid crystal molecules of the display panel to deflect at a first angle in the vertical direction; when the display panel is in the non-peep-proof display mode: inputting a compensation signal to the peep-proof electrode so as to enable the liquid crystal molecules to deflect at a second angle in the vertical direction; the second angle is less than the first angle.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel and a display method of a display device.
Background
With the development of display technology, display devices such as mobile phones and computers have increasingly wide application. In general, a display device has a large viewing angle, and users at different viewing angles can know displayed information. However, in some specific scenarios, the user may want the information displayed by the display panel not to be known by other users around the display panel, i.e., the display panel may want to have a privacy function.
In the prior art, as shown in fig. 1, the display panel includes a first substrate and a second substrate that are disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate. The first substrate is provided with a common electrode and a pixel electrode, and one side of the second substrate close to the liquid crystal layer is provided with a peep-proof electrode. The display panel may include a non-privacy display mode (Share mode) and a privacy display mode (Peep-proof mode) when displaying, and the display panel may be operated in the privacy display mode or the non-privacy display mode by controlling a voltage difference between the privacy electrode and the common electrode.
The inventor finds that when the conventional display panel displays in the peep-proof display mode, the problem of poor block display occurs, and meanwhile, the peep-proof display panel has a low light-emitting rate and large power consumption in the non-peep-proof display mode.
Disclosure of Invention
The present invention is directed to at least one of the technical problems in the prior art, and provides a display method of a display panel for improving the brightness of light emitted from the display panel.
The technical scheme adopted for solving the technical problem of the invention is a display method of a display panel, which comprises the following steps: when the display panel is in the peep-proof display mode, inputting a peep-proof signal to a peep-proof electrode of the display panel so as to enable liquid crystal molecules of the display panel to deflect at a first angle in the vertical direction;
when the display panel is in the non-peep-proof display mode: inputting a compensation signal to the peep-proof electrode so as to enable the liquid crystal molecules to deflect at a second angle in the vertical direction; the second angle is less than the first angle.
Preferably, the display method of the display panel further includes: inputting a scanning signal to a pixel electrode of a display panel;
the input of the peep prevention signal is synchronized with the input of the scanning signal.
Preferably, the inputting of the scan signal to the pixel electrode of the display panel includes: inputting scanning signals to pixel electrodes of a display panel line by line;
the inputting of the peep-proof signal to the peep-proof electrode of the display panel includes: inputting peep-proof signals to the peep-proof electrodes row by row;
the peep prevention signal is in line synchronization with the scanning signal.
Further preferably, the waveform of the peep-proof signal comprises a square wave.
Preferably, the bias voltage of the compensation signal and the common voltage signal is less than 4V.
Preferably, the compensation signal comprises a square wave signal.
Further preferably, the square wave signal comprises a high frequency square wave signal.
Further preferably, the duty cycle of the square wave signal comprises 20% -40%.
Preferably, the display method of the display panel further includes: inputting a common voltage signal to a common electrode of the display panel;
the waveform of the compensation signal is symmetrical with respect to the waveform of the common voltage signal.
Another technical solution adopted to solve the technical problem of the present invention is a display method of a display device, including any one of the display methods of the display panels described above.
Drawings
FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a relationship between a display luminance boost ratio compensation signal of a display panel and a bias voltage of a common voltage signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating waveforms of compensation signals in a display method of a display panel according to an embodiment of the invention;
FIG. 4 is a schematic layout diagram of a pixel unit of a display panel according to an embodiment of the invention;
FIG. 5 is a diagram illustrating control signals of pixel electrodes in a display method of a display panel according to an embodiment of the invention;
wherein the reference numerals are: 11. a first substrate; 12. a pixel electrode; 13. (ii) a 2. A liquid crystal; 21. a second substrate; 22. a color film pattern; 3. a privacy electrode; 4. an insulating protective layer; 5. an OC protective layer.
Detailed Description
Various embodiments will now be described in detail, with reference to the accompanying drawings, which are provided as illustrative examples of the invention so as to enable those skilled in the art to practice the invention. It is noted that the following figures and examples are not meant to limit the scope of the present invention. Where certain elements of the present invention can be partially or fully implemented using known components (or methods or processes), only those portions of such known components (or methods or processes) that are necessary for an understanding of the present invention will be described, and detailed descriptions of other portions of such known components will be omitted so as not to obscure the invention. Further, the various embodiments are illustrative of present and future known equivalents to the components referred to herein.
When introducing elements of the present application and the embodiments thereof, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements; "plurality" means two or more unless otherwise specified; the terms "comprising," "including," "containing," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements; the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or order of formation.
As shown in fig. 1, the display panel includes: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal 2 disposed between the first substrate and the second substrate. The first substrate and the second substrate can be an array substrate and a color film substrate respectively. In this embodiment, a first substrate is taken as an array substrate, and a second substrate is taken as a color film substrate. Specifically, the first substrate includes a common electrode, a pixel electrode 12, a thin film transistor, a signal line (including a gate line, a data line, etc.), and the like, which are disposed on the first substrate 11, in accordance with a common array substrate. The second substrate includes a color film layer disposed on a second substrate 21, and the color film layer includes a plurality of color film patterns 22 arranged according to a predetermined rule (for example, arranged in an array). And, the second base plate still includes setting up and is close to a plurality of peep-proof electrodes 3 of first base plate one side at the color film layer. The peep-proof electrode 3 is insulated from the color film layer, and the peep-proof electrode 3 corresponds to the color film pattern 22 one by one, and the peep-proof electrode 3 and the color film pattern can be separated by an OC protective layer 5 made of an insulating material. Meanwhile, the peep-proof electrodes 3 are also separated from each other by an insulating material. In addition, an insulating protective layer 4 is further provided on the side of the privacy electrode 3 close to the first substrate to separate the privacy electrode 3 from the liquid crystal 2. Specifically, the peep preventing electrode 3 is a transparent electrode so as not to affect the normal display of the display panel, and specifically, the material of the peep preventing electrode 3 may include ITO (Indium Tin Oxides).
The display modes of the display panel are divided into a peep-proof mode and a non-peep-proof mode. In an embodiment of the present invention, the display panel may further include a control device for controlling a voltage difference between the privacy electrode 3 and the common electrode to operate the display panel in a privacy display mode or a non-privacy display mode. When the display panel performs f display, a common voltage signal is input to the common electrode, and a data signal is input to the pixel electrode 12, so that the electric field formed by the common electrode and the pixel electrode 12 drives the liquid crystal 2 to deflect at a corresponding angle in the horizontal direction, thereby realizing the display control of the display panel. When the display panel is in the non-peep-proof display mode, signals do not need to be input to the peep-proof electrode 3, the liquid crystal 2 deflects only in the horizontal direction, and the display panel is in a wide-viewing-angle sharing mode (namely, the non-peep-proof display mode); in the peep-proof display mode, a peep-proof signal is input to the peep-proof electrode 3, an electric field is also formed between the peep-proof electrode 3 and the common electrode, so that the liquid crystal 2 deflects in the horizontal direction and also deflects at a certain angle in the vertical direction, the visual range of the display panel is reduced, and the peep-proof effect on the left side and the right side of the display panel is realized.
In the display panel, compared with a common display panel, one more layer of the peep-proof electrode 3 is provided, and although the peep-proof electrode 3 is made of a transparent material, the light transmittance of the display panel is still reduced, so that the brightness of the display panel in a non-peep-proof display state is low, and the light extraction rate of the whole display panel is not high enough. Especially, when a high-brightness display screen is displayed, the light-emitting brightness of the backlight module needs to be increased to ensure the light-emitting brightness of the display panel, which can lead to the power consumption of the display panel being greatly increased.
In view of the above problems, the present invention provides a display method of a display panel, which increases the light-emitting rate of the display panel by adjusting an input signal in the display panel. In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
the embodiment provides a display method of a display panel, which includes: when the display panel is in the peep-proof display mode, inputting a peep-proof signal to a peep-proof electrode 3 of the display panel so as to enable liquid crystal 2 molecules of the display panel to deflect at a first angle in the vertical direction; when the display panel is in the non-peep-proof display mode: inputting a compensation signal to the peep-proof electrode 3 to enable the liquid crystal 2 molecules to deflect at a second angle in the vertical direction; the second angle is less than the first angle.
In the peep-proof display mode, the control device can control the input voltage to the peep-proof electrode 3 and the common electrode, so that a first voltage difference exists between the peep-proof electrode 3 and the common electrode. In this case, in addition to the electric field generated between the common electrode and the pixel electrode 12 for causing the display panel to display images, an additional electric field is generated between the peep-proof electrode 3 and the common electrode, and the additional electric field can cause the liquid crystal 2 to deflect at a first angle in the vertical direction, so that the divergence angle of light emitted by the backlight module after passing through the liquid crystal 2 is reduced, thereby increasing the brightness in a dark state, reducing the contrast of the display panel, and further causing the display panel to have the peep-proof effect.
It should be noted that the first angle is an angle within a certain range, and the specific value may be determined according to actual conditions such as the liquid crystal 2 material, and the viewing angle of the display panel may be finally reduced. It can be understood that, in the process of displaying on the same display panel, in order to ensure the anti-peeping effect of the display panel, the required deflection angles of the liquid crystals 2 at different positions are different, the first angles at different positions are also different, and the anti-peeping signals input to the anti-peeping electrodes 3 corresponding to the liquid crystals 2 at different positions may also be different.
In the non-peep-proof display mode, in the prior art, the peep-proof electrode 3 can be suspended through the control device, so that the display panel is in the non-peep-proof display mode. Here, "suspending" means that no voltage is applied to the peep-preventing electrode 3. By suspending the peep prevention electrode 3, an electric field can be not generated between the peep prevention electrode 3 and the common electrode, that is, there is no voltage difference. In this case, the peep prevention electrode 3 does not affect the rotation state of the liquid crystal 2 molecules and the contrast of the display panel, and thus the peep prevention effect is not generated. In the present embodiment, the control device inputs the compensation signal to the peep-proof electrode 3, so that a second voltage difference smaller than the first voltage difference is formed between the peep-proof electrode 3 and the common electrode. At the second voltage difference, the liquid crystal 2 is deflected in the vertical direction by a certain angle (second angle), which is smaller, and the liquid crystal 2 is in a slightly tilted state. Experiments prove that under the liquid crystal deflection state, light can penetrate through the liquid crystal 2, and in a state that the peep-proof electrode 3 is not arranged, after compensation signals are input into the peep-proof electrode 3, the proportion that the light penetrates through the liquid crystal 2 layer is higher, namely the light-emitting rate of the display panel is higher, so that the problem that the light-emitting rate of the display panel is not high due to the arrangement of the peep-proof electrode 3 can be effectively solved.
It can be understood that the light transmittance of the display panel is related to the voltage difference between the privacy electrode 3 and the common electrode (i.e. the bias voltage of the compensation signal input to the privacy electrode 3 relative to the common voltage signal), for example, the corresponding relationship can refer to fig. 2. In this embodiment, in order to ensure that the display panel is in the non-peep-proof mode after the compensation signal is input to the peep-proof electrode 3, and the light-emitting brightness of the display panel can be improved, the bias voltage of the peep-proof electrode 3, the compensation signal, and the common voltage signal is preferably smaller than 4V. Furthermore, according to experimental data, when the bias voltage is 2 v, the light transmittance of the display panel is significantly improved, which can be improved by about 15%.
As an embodiment, in the present embodiment, the compensation signal input to the peep-preventing electrode 3 may include a square wave signal. Among them, it is preferable that the waveform of the compensation signal is symmetrical with respect to the waveform of the common voltage signal, as shown in fig. 3. The compensation signal has a certain voltage difference with the common voltage signal to prevent the liquid crystal 2 from being polarized by making the waveform of the compensation signal symmetrical with respect to the waveform of the common voltage signal.
Further preferably, the square wave signal includes a high frequency square wave signal to avoid causing a screen flash phenomenon of the display panel during displaying. Specifically, the scanning signal and the peep prevention signal typically have a frequency of several tens of hertz, while the compensation signal is much higher in implementation, on the order of several thousands to several tens of kilohertz (Hz).
Preferably, the duty cycle of the square wave signal comprises 20% -40%. Further preferably, the duty cycle of the square wave signal is preferably 30%. As shown in table 1, in the non-peep-proof mode, when a square wave (square wave) with a frequency of 50kHz, a duty ratio of 30% and a bias voltage of 2 v is input to the peep-proof electrode 3, the light transmittance of the display panel can be increased by 18%, that is, the light-emitting rate of the display panel is significantly increased.
TABLE 1 display Brightness contrast of display Panel
In addition, in the embodiment, in the peep-proof display mode, the control device controls the input voltages to the peep-proof electrode 3 and the common electrode, so that a first voltage difference is formed between the peep-proof electrode 3 and the common electrode. In the prior art, the display of the display panel is row refresh, that is, the pixel units on the display panel are sequentially opened according to rows, that is, when the first row is opened, the remaining rows are closed, and after the first row is closed, the second row is opened again, and the third row and the fourth row … … are sequentially opened until all rows are refreshed.
In the prior art, the peep prevention signal is input once in the whole display area. Due to the existence of the transmission impedance, there is a signal delay between the upper and lower peep-prevention electrodes 3 (for example, the first row and the last row), so that the scanning signal does not match with the peep-prevention signal during the refresh, and the display area is poor in Block (Block) display.
In view of the above, in the present embodiment, it is preferable that the peep prevention signal is input in synchronization with the scan signal. Specifically, taking the scanning signal as an example of row refresh, in this case, preferably, the step of inputting the scanning signal to the pixel electrode 12 of the display panel may include: inputting scanning signals to the pixel electrodes 12 of the display panel line by line; the step of inputting the peep prevention signal to the peep prevention electrode 3 of the display panel may include: inputting peep-proof signals to the peep-proof electrodes 3 row by row; the privacy signal is line synchronized with the scan signal. Specifically, as shown in fig. 4 and 5, the pixel units are arranged in an array, and the control device can input a control signal to the driving transistor through each gate line, so as to control the data input state (i.e., the on-off state) of the pixel electrode 12 row by row, and the pixel units in each row are sequentially switched on and off. Meanwhile, when the pixel unit is turned on, when a data signal is input to the pixel electrode 12, the peep-proof signals are synchronously fed to the peep-proof electrodes 3 corresponding to the same row along with the refreshing of each row, the peep-proof signals are not input to the peep-proof electrodes 3 corresponding to the pixel electrodes 12 which are not turned on, the horizontal deflection of the liquid crystal 2 molecules in each row is influenced by the electric field generated by the pixel electrodes 12, and the deflection in the vertical direction is influenced by the electric field generated by the peep-proof electrodes 3, so that the contrast of the liquid crystal 2 in the left and right directions of the row is rapidly reduced, and the large-viewing-angle display contrast of the liquid crystal 2 in the left and right directions of each row is reduced to be very low along with the refreshing of each row, thereby achieving the peep. In the embodiment, the peep-proof signals are matched with the row scanning signals through the peep-proof electrodes 3 matched with the sub-pixels in each row, so that the peep-proof and row refreshing synchronization is realized, and the Block defect caused by signal delay can be avoided. Meanwhile, the influence of peep-proof signals of different rows on the electric field of the liquid crystal 2 under the pixels of the row can be avoided, and the uniformity of picture display is improved.
Preferably, the peep-proof signal of the embodiment is also a square wave signal, so that a specific inner trapezoidal wave signal in the prior art does not need to be set, and a complex circuit design scheme is avoided. It should be noted that, in this embodiment, although both the peep-proof signal and the compensation signal are square wave signals, the amplitude ranges of the peep-proof signal and the compensation signal are different, the peep-proof signal is used for causing the liquid crystal 2 to deflect at a relatively large angle so as to reduce the visible range of the display panel, the compensation signal is used for causing the liquid crystal 2 to deflect at a relatively small angle, and the liquid crystal 2 has a higher light extraction rate of light rays in the deflection range, so that the display brightness of the display panel is brighter. Meanwhile, the frequency ranges of the peep-proof signal and the compensation signal are also different, and reference may be made to the above description specifically, which is not described herein again in this embodiment.
Example 2:
the present embodiment provides a display method of a display device, which may include any one of the display panel display methods provided in embodiment 1.
Since the display method of the display device provided in this embodiment includes the display method of the display panel provided in embodiment 1, the emission brightness of the display panel in the non-peep-proof mode can be improved, and the problem of poor Block of the display panel in the peep-proof mode can be solved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A display method of a display panel, comprising: when the display panel is in the peep-proof display mode, inputting a peep-proof signal to a peep-proof electrode of the display panel so as to enable liquid crystal molecules of the display panel to deflect at a first angle in the vertical direction;
when the display panel is in the non-peep-proof display mode: inputting a compensation signal to the peep-proof electrode so as to enable the liquid crystal molecules to deflect at a second angle in the vertical direction; the second angle is less than the first angle.
2. The display method of the display panel according to claim 1, further comprising: inputting a scanning signal to a pixel electrode of a display panel;
the input of the peep prevention signal is synchronized with the input of the scanning signal.
3. The display method of claim 2, wherein the inputting of the scan signal to the pixel electrode of the display panel comprises: inputting scanning signals to pixel electrodes of a display panel line by line;
the inputting of the peep-proof signal to the peep-proof electrode of the display panel includes: inputting peep-proof signals to the peep-proof electrodes row by row;
the peep-proof signal and the scanning signal are synchronously input in a row.
4. The display method of claim 3, wherein the waveform of the peep-proof signal comprises a square wave.
5. The method of claim 1, wherein the offset signal and the common voltage signal are biased at less than 4V.
6. The display method of claim 1, wherein the compensation signal comprises a square wave signal.
7. The display method of claim 6, wherein the square wave signal comprises a high frequency square wave signal.
8. The display method of claim 6, wherein the duty cycle of the square wave signal comprises 20% -40%.
9. The display method of the display panel according to claim 6, further comprising: inputting a common voltage signal to a common electrode of the display panel;
the waveform of the compensation signal is symmetrical with respect to the waveform of the common voltage signal.
10. A display method of a display device, comprising the display panel of any one of claims 1 to 9.
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