CN110503929B - Three-visual-angle display driver and display device - Google Patents
Three-visual-angle display driver and display device Download PDFInfo
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- 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
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Abstract
The invention provides a three-view display driver and a display device. The three-view display driver is used for driving the display panel, and the detection control module selects according to the view control signal: outputting a viewing angle electrode voltage which is the same as the common electrode voltage when the wide viewing angle mode is selected, and outputting a viewing angle electrode voltage which is different from the common electrode voltage when the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode is selected so as to reduce the viewing angle; and selecting a second narrow viewing angle sub-mode, and outputting a dark state frame signal of a designated frame at a fixed time interval to insert a dark state frame so as to further narrow the viewing angle. The present invention also provides a display device using such a three-view display driver. This scheme can reach the controllable while of wide and narrow visual angle, still can follow the effect that the visual angle changes the switching, satisfies user's immediate environment needs, and the peep-proof effect is outstanding.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a three-view display driver and a display device.
Background
A Liquid Crystal Display (LCD) has advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost, and is dominant in the field of flat panel displays. The current display device gradually develops towards the direction of wide viewing angle, no matter the application of mobile phone mobile terminal, desktop display or notebook computer, besides the requirement of wide viewing angle, in many occasions, the display device is also required to have the function of switching between wide viewing angle and narrow viewing angle, and many display manufacturers correspondingly put forward many displays capable of switching viewing angle.
However, the mainstream switchable viewing angle display in the market at present only has two wide and narrow viewing angles, and can not be selectively switched along with the change of the viewing angles under the narrow viewing angles, so that the peep-proof effect is poor.
Disclosure of Invention
The invention aims to provide a three-view display driver and a display device, which can select and switch a plurality of narrow view angle modes along with the change of view angles while providing controllable wide and narrow view angles to meet the peep-proof effect.
Specifically, the present invention provides a three-view display driver for driving a display panel, the three-view display driver comprising: a front-end input module for providing a view control signal to select a wide view mode, a first narrow view sub-mode or a second narrow view sub-mode; the time sequence control module is connected with the front end input module and used for selectively outputting corresponding display code signals and time sequence signals through the received visual angle control signals; the detection control module is connected with the front-end input module and the time sequence control module, and is used for receiving the visual angle control signal and the time sequence signal, and according to the selection of the visual angle control signal: outputting a viewing angle electrode voltage which is the same as a common electrode voltage when the wide viewing angle mode is selected, and outputting a viewing angle electrode voltage which is different from the common electrode voltage when the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode is selected to reduce a viewing angle; and selecting the second narrow viewing angle sub-mode with a fixed time interval to output a dark state frame signal of a designated frame to insert the dark state frame. And the display panel driving module is connected with the time sequence control module and the detection control module and used for receiving the display code signal, the visual angle electrode voltage and the dark state frame signal, outputting a source electrode driving signal to drive the display panel to display, and driving the display panel to display a dark state frame when receiving the dark state frame signal.
Further, the view control signal includes a hybrid view mode signal and a narrow view mode signal, the hybrid view mode signal is used to select the wide view mode or the narrow view mode, the narrow view mode includes the first narrow view sub-mode and the second narrow view sub-mode, and the narrow view mode signal is used to select the first narrow view sub-mode or the second narrow view sub-mode.
Further, when the hybrid view mode signal is at a high level, the wide view mode is selected; selecting the first narrow view sub-mode when the hybrid view mode signal is at a low level and the narrow view mode signal is at a high level; selecting the second narrow view sub-mode when the hybrid view mode signal is low level and the narrow view mode signal is low level.
Preferably, the detection control module outputs the dark frame signal of the designated frame at a fixed time interval as a frame-by-frame dark frame signal.
Further, the outputting the dark frame signal by the detection control module includes: and reducing the voltage difference between each path of gamma reference voltage and the common electrode voltage according to the time sequence signal so as to reduce the gamma reference voltage difference and insert the dark state frame.
Further, among the gamma reference voltages having the reduced voltage difference, the voltage difference between the gamma reference voltage having the highest voltage value and the gamma reference voltage having the lowest voltage value is 0.2V or less.
Further, the detection control module comprises a detection unit and a switch switching unit electrically connected with the detection unit, and when the detection unit detects that the viewing angle control signal selects the second narrow viewing angle sub-mode, the detection unit outputs a pressure difference control level of a designated frame to the switch switching unit at a fixed interval time so that the switch switching unit outputs the gamma reference voltage with reduced pressure difference according to the pressure difference control level.
Preferably, the switch switching unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first switching tube, a second switching tube and a third switching tube; the first resistor is arranged between an input analog voltage and an output first gamma reference voltage in series, the second resistor is arranged between the output first gamma reference voltage and an input end of the second switching tube in series, the third resistor is arranged between the output first gamma reference voltage and the ground in series, the fourth resistor is arranged between the input analog voltage and an input end of the first switching tube in series, a control end of the second switching tube is electrically connected with an input end of the first switching tube, an output end of the second switching tube is grounded, and a control end of the first switching tube receives the input voltage difference control level; the fifth resistor is arranged between the input analog voltage and the output second gamma reference voltage in series, the sixth resistor is arranged between the output second gamma reference voltage and the input end of the third switching tube in series, the seventh resistor is arranged between the output second gamma reference voltage and the ground in series, the output end of the third switching tube is grounded, and the control end of the third switching tube receives the input voltage difference control level.
The invention also provides a display device, which comprises at least one three-view display driver and a display panel, wherein the display panel comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer positioned between the color film substrate and the array substrate, and a view control electrode is arranged on the color film substrate to receive the voltage of the view electrode.
Further, the viewing angle electrode voltage is a direct current voltage in the wide viewing angle mode, and is a periodic alternating current voltage in the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode.
The display panel of the display device is a liquid crystal display panel, so that the advantages of good image quality, small volume, light weight, low driving voltage, low power consumption and no radiation can be taken into consideration, and the panel is also a mature panel in the market and has relatively low manufacturing and purchasing cost.
The three-view display driver and the display device provided by the invention can determine the required display view angle mode according to the input mixed view angle mode signal and the narrow view angle mode signal, and can provide three view angle modes, namely a wide view angle mode, a first narrow view angle sub-mode and a second narrow view angle sub-mode, so that the display terminal is driven to carry out corresponding display, and the requirement of the instant environment of a user is met. The wide and narrow visual angle is controllable so as to meet the peeping prevention effect, and meanwhile, the selection switching can be carried out along with the change of the visual angle, the requirements of various visual angles of users can be met, and the peeping prevention effect is excellent.
Drawings
Fig. 1 is a first block diagram of a three-view display driver according to an embodiment of the invention.
Fig. 2 is a block diagram of a three-view display driver according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a switch switching unit according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the invention.
FIG. 5 is a timing diagram illustrating operation of a three-view display driver according to an embodiment of the invention.
Fig. 6 is a flowchart illustrating an operation of a display device according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention firstly provides a three-view display driver for driving a display panel. Fig. 1 is a first block diagram of a three-view display driver according to an embodiment of the invention. In an embodiment of the present invention, as shown in fig. 1, the three-view display driver includes a front-end input module 11, a timing control module 12, a detection control module 13, and a display panel driving module 14.
The front-end input module 11 is configured to provide a viewing angle control signal to select a wide viewing angle mode, a first narrow viewing angle sub-mode or a second narrow viewing angle sub-mode. Fig. 2 is a block diagram of a three-view display driver according to an embodiment of the invention. Referring to fig. 2, in an embodiment, the view control signal provided by the front-end input module 11 includes a hybrid view mode signal HVA and a narrow view mode signal CNVA. The hybrid view mode signal HVA is used to select a wide view mode or a narrow view mode, the narrow view mode includes a first narrow view sub-mode and a second narrow view sub-mode, and the narrow view mode signal CNVA is used to select the first narrow view sub-mode or the second narrow view sub-mode. In other embodiments, the view control signal provided by the front-end input module 11 may also be a signal in other manners, such as a digitally encoded signal, so that the wide view mode, the first narrow view sub-mode or the second narrow view sub-mode may be selected. In an embodiment, the user selects a corresponding view mode button switch according to the environment where the user is located, so that the front-end input module 11 generates the corresponding hybrid view mode signal HVA and the narrow view mode signal CNVA. In another embodiment, the front-end input module 11 may also automatically send out the hybrid view mode signal HVA and the narrow view mode signal CNVA according to the environment sensing result, and when the display device is in the on state, the front-end input module 11 may also automatically send out the default hybrid view mode signal HVA and the default narrow view mode signal CNVA, and so on.
The timing control module 12 is connected to the front-end input module 11, and switches and outputs the corresponding display code signal E to the display panel driving module 14 according to the viewing angle control signal, and outputs a timing signal TSW 1.
The detection control module 13 is connected to the front-end input module 11 and the timing control module 12, and is configured to receive the viewing angle control signal and the timing signal TSW1, and select, according to the viewing angle control signal: outputting a viewing angle electrode voltage ACVcom which is the same as a common electrode voltage (i.e., DC Vcom) when the wide viewing angle mode is selected, and outputting a viewing angle electrode voltage ACVcom which is different from the common electrode voltage to reduce a viewing angle when the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode is selected; and selecting a second narrow viewing angle sub-mode, and outputting a dark state frame signal of a designated frame at a fixed time interval to insert a dark state frame so as to further reduce the viewing angle.
Referring to fig. 2, in an embodiment, the detection control module 13 reduces the voltage difference between each of the gamma reference voltages and the common electrode voltage according to the timing signal TSW1, and outputs the gamma reference voltage signal Vn as the dark frame signal, so as to reduce the gamma reference voltage difference and insert the dark frame. In other embodiments, the dark frame may also be generated by other methods such as software or hardware, for example, the detection control module 13 outputs a dark frame signal to make the display code content output by the display panel driving module 14 be a dark state, or the detection control module 13 outputs a dark frame signal to make all the gamma voltages output by the display panel driving module 14 be the same as the common electrode voltage, or the detection control module 13 outputs a dark frame signal to make the display panel driving module 14 drive the backlight of the display panel to be turned off to insert the dark frame.
In one embodiment, the detection control module 13 is configured to switch and output the corresponding viewing angle electrode voltage ACVcom to the display panel driving module 14 at the rear end according to the received mixed viewing angle mode signal HVA so as to selectively enter the wide viewing angle mode or the narrow viewing angle mode. Specifically, when the narrow viewing angle mode needs to be operated, the detection control module 13 determines the narrow viewing angle mode signal CNVA, and when the narrow viewing angle mode needs to be operated in the first narrow viewing angle sub-mode, outputs a viewing angle electrode voltage ACVcom different from that in the wide viewing angle mode, and when the narrow viewing angle sub-mode needs to be operated in the second narrow viewing angle sub-mode, not only outputs a viewing angle electrode voltage ACVcom different from that in the wide viewing angle mode, but also switches and outputs a gamma reference voltage signal Vn different from that in the wide viewing angle mode and that in the first narrow viewing angle sub-mode to the display panel driving module 14 according to the timing signal TSW1, so as to insert a dark state frame to implement the second narrow viewing angle sub-mode.
The display panel driving module 14 outputs a corresponding source driving signal S according to the received viewing angle electrode voltage ACVcom, the gamma reference voltage signal Vn and the display code signal E, so as to drive the display panel to display a corresponding viewing angle mode.
Illustratively, in an embodiment, when the hybrid view mode signal HVA is high, the wide view mode is selected; when the mixed view mode signal HVA is at a low level and the narrow view mode signal CNVA is at a high level, selecting a first narrow view sub-mode; when the hybrid view mode signal HVA is at a low level and the narrow view mode signal CNVA is at a low level, the second narrow view sub mode is selected. In another embodiment, different high and low level signals may be selected for definition. Therefore, the selective entrance of different view angle modes is realized, and the requirement of the dynamic view angle of the display device is met.
In one embodiment, the detection control module 13 outputs the dark frame signal of the designated frame at intervals of a fixed duration, and outputs the dark frame signal of one frame at intervals of one frame. In other embodiments, the insertion interval of the dark state frames may also be other frame insertion frequencies, such as every 2 frames, every 3 frames, or every 4 frames, and so on, and each inserted dark state frame may also be consecutive 2 frames, consecutive 3 frames, or consecutive 4 frames, and so on.
In one embodiment, the gamma reference voltage signal Vn is a two-way signal. In the 8-bit panel data, the detection control module 13 provides the first gamma reference voltage V1 and the second gamma reference voltage V2 to the display panel driving module 14, so that the programmable gamma chip inside the display panel driving module 14 generates fourteen gamma voltages and further generates 256 gray scale voltages, and the 256 gray scale voltages correspond to 256 gray scale displays. In other embodiments, the gamma reference voltage signal Vn can be more than two signals. When the gamma reference voltages are greater than the two paths, decreasing the voltage difference between the gamma reference voltages may be a synchronous decrease of the voltage difference between each of the gamma reference voltages. For example, the gamma reference voltages with reduced voltage difference all output the common electrode voltage, and the voltage difference between every two gamma reference voltages is zero at this time. For another example, in the two paths of gamma reference voltages, the common electrode voltage is 5V, and the normal first path of gamma reference voltage V1 and the normal second path of gamma reference voltage V2 are respectively: 8.5V and 1.5V, and the gamma reference voltage V1 and the gamma reference voltage V2 after reducing the voltage difference are respectively as follows: 5.1V and 4.9V. Of course, the voltage difference between the gamma reference voltages can also be reduced according to the gamma curve of a specific dark frame, for example, a gamma curve with a gamma value of 1. In short, by changing each path of gamma reference voltage to be close to the voltage of the common electrode, the gamma voltage can be forcibly changed to be close to the voltage of the common electrode, and the gray scale voltage of the source driving signal S is further forcibly changed to be close to the voltage of the common electrode, so that the deflection angle of liquid crystal molecules is reduced, and insertion of a dark state frame is realized.
In one embodiment, the detection control module 13 includes a detection unit 131 and a switch switching unit 132. The detecting unit 131 is electrically connected to the switch switching unit 132, when detecting that the viewing angle control signal selects the second narrow viewing angle sub-mode, the detecting unit 131 outputs the voltage difference control level Vs of the designated frame to the switch switching unit 132 at a fixed interval, and the switch switching unit 132 switches and outputs the gamma reference voltage with the reduced voltage difference according to the voltage difference control level Vs.
In one embodiment, the voltage difference between the gamma reference voltages outputted from the switching unit 132 is different. Here, a voltage difference between the gamma reference voltage Va having the highest voltage value and the gamma reference voltage Vb having the lowest voltage value (hereinafter referred to as a maximum voltage difference Va-Vb) is also different. In one embodiment, for example, in the normal gamma reference voltage signal Vn, the gamma reference voltage Va with the highest voltage value is 8.5V, and the gamma reference voltage Vb with the lowest voltage value is 1.4V. The maximum voltage difference Va-Vb of the gamma reference voltage signals Vn of the first group is 7.1v, which is the voltage difference of the normal gamma reference voltage signals Vn, and the maximum voltage difference Va-Vb of the gamma reference voltage signals Vn of the second group is 0.2v, which is the voltage difference of the gamma reference voltage signals Vn of the dark state frame. In another embodiment, the maximum voltage difference Va-Vb of the gamma reference voltage signals Vn of the second group is less than 0.2V to output a dark state frame. In other embodiments, the first and second sets of gamma reference voltage signals Vn, Va-Vb can be set to different values depending on the particular system architecture and desired gamma curve.
Specifically, as shown in the operation timing diagram of fig. 5, when it is not necessary to insert the dark frame, the detection control module 13 selectively outputs the first set of gamma reference voltage signals Vn through the switch switching unit 132 to output the gamma reference voltage signals Vn with the maximum voltage difference Va-Vb of 7.1V. When the detecting unit 131 in the detecting control module 13 detects that a dark frame needs to be inserted, the voltage difference control level Vs is inverted according to the timing signal TSW1, so that the switch switching unit 132 switches and outputs the gamma reference voltage signal Vn of the second group to output the gamma reference voltage signal Vn with the corresponding maximum voltage difference Va-Vb of 1v, thereby reducing the voltage difference of the gamma voltage to drive the display panel to display the dark frame.
In one embodiment, the detecting unit 131 inverts the voltage difference control level Vs through the MCU. In another embodiment, the detecting unit 131 inverts the differential pressure control level Vs through a timing controller. In other embodiments, the detecting unit 131 may also implement the inversion of the voltage difference control level Vs by other hardware or software such as a logic circuit.
In one embodiment, the detecting unit 131 inverts the differential control level Vs to change the differential control level Vs from a high level to a low level. In another embodiment, the detecting unit 131 inverts the voltage difference control level Vs from a low level to a high level.
Fig. 3 is a circuit diagram of the switch switching unit 132 according to an embodiment of the invention. As shown in fig. 3, the switch switching unit 132 includes a first resistor R11, a second resistor R12, a third resistor R13, a fourth resistor R14, a fifth resistor R21, a sixth resistor R22, a seventh resistor R23, a first switch tube Q30, a second switch tube Q31, and a third switch tube Q32. The first resistor R11 is serially connected between an input analog voltage AVDD and an output first gamma reference voltage V1, the second resistor R12 is serially connected between the output first gamma reference voltage V1 and an input end of the second switch tube Q31, the third resistor R13 is serially connected between the output first gamma reference voltage V1 and ground, the fourth resistor R14 is serially connected between the input analog voltage AVDD and an input end of the first switch tube Q30, a control end of the second switch tube Q31 is electrically connected with an input end of the first switch tube Q30, an output end of the second switch tube Q31 and an output end of the first switch tube Q30 are grounded, and a control end of the first switch tube Q30 receives an input differential voltage control level Vs; the fifth resistor R21 is serially connected between the input analog voltage AVDD and the output second gamma reference voltage V2, the sixth resistor R22 is serially connected between the output second gamma reference voltage V2 and the input end of the third switching tube Q32, the seventh resistor R23 is serially connected between the output second gamma reference voltage V2 and the ground, the output end of the third switching tube Q32 is grounded, and the control end of the third switching tube Q32 receives the input voltage difference control level Vs, wherein the switching tube in the circuit is an N-type switching tube, and of course, other types of switching elements such as a triode and the like can be used as the switching tube in the circuit to implement the circuit function.
In this embodiment, when the system is powered on and initialized, the detecting unit 131 outputs a default high-level voltage difference control level Vs, at this time, the first switch Q30 is turned on, the third switch Q32 is turned on, and at this time, the control terminal of the second switch Q31 is at a low level, so that the second switch Q31 is turned off, and at this time, the second resistor R12 is equivalently suspended; at this time, the third switch Q32 is turned on, which is equivalent to grounding one end of the sixth resistor R22, so the gamma reference voltage V1 and the gamma reference voltage V2 output the first set of gamma reference voltages V1-V2, such as 8.5V and 1.4V, thereby enabling the display panel driving module 14 to drive the normally displayed image frame. When the detecting unit 131 detects that a dark frame needs to be inserted, the voltage difference control level Vs of a low level is output, the first switch Q30 is turned off, the third switch Q32 is turned off, and the control terminal of the second switch Q31 is at a high level, so that the second switch Q31 is turned on, the one end of the second resistor R12 is equivalent to ground, the third switch Q32 is turned off, and the one end of the sixth resistor R22 is suspended, so that the gamma reference voltages V1 and V2 output voltages of the second group of gamma reference voltages V1V 2, such as 5.1V and 4.9V, and the display panel driving module 14 drives the display of the dark frame. In other embodiments, the specific voltage may be set to other values as desired.
The invention also provides a display device comprising at least one three-view display driver as provided above and a display panel. The display panel is connected with the three-view display driver to receive the source driving signal S and the view electrode voltage ACVcom output by the three-view display driver. As shown in fig. 4, a display panel of a display device according to an embodiment of the present invention includes a color filter substrate 21, a transistor array substrate 22 disposed opposite to the color filter substrate 21, and a liquid crystal layer 23 located between the color filter substrate 21 and the array substrate 22.
A viewing angle control electrode 213 and a dc common electrode 211 are disposed on the color filter substrate, wherein a viewing angle electrode voltage ACVcom is electrically connected to the viewing angle control electrode 213, and a three-viewing angle display driver of the display device outputs the viewing angle electrode voltage ACVcom to the viewing angle control electrode 213. By applying a voltage to the viewing angle control electrode 213, a different voltage difference (i.e., a bias voltage) can be generated between the viewing angle control electrode 213 and the dc common electrode 211 of the display panel, so that the display device can realize switching between wide and narrow viewing angle modes. In one embodiment, the display device is default to the wide viewing angle mode after being powered on. In other embodiments, the display device may be set to default to the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode after being powered on and started according to the peep-proof requirement.
When the same dc voltage as the common electrode 211 is applied to the viewing angle control electrode 213, for example, the common electrode voltage is output to the common electrode 211, and a dc voltage signal identical to the common electrode voltage of the common electrode 211 is output to the viewing angle control electrode 213, no bias voltage is generated between the viewing angle control electrode 213 and the common electrode 211, and the display device realizes a normal wide viewing angle mode;
when a voltage different from that of the common electrode 211 is applied to the viewing angle control electrode 213, for example, a common electrode voltage is output to the common electrode 211, and a periodic ac voltage fluctuating up and down around the common electrode voltage is output to the viewing angle control electrode 213, a bias voltage is generated between the viewing angle control electrode 213 and the common electrode 211, a horizontal electric field is formed in a region of the color film substrate 21 close to the liquid crystal layer 23, liquid crystal molecules are deflected by the horizontal electric field, and finally, a light leakage phenomenon occurs on a screen, the contrast of the screen is reduced, and the viewing angle is reduced, so that the display viewing angle of the display device is narrowed. At this time, the display panel displays a first narrow viewing angle sub-mode or a second narrow viewing angle sub-mode. Illustratively, as shown in the operation timing diagram of fig. 5, in order to prevent polarization of the liquid crystal, the viewing angle electrode voltage ACVcom applied to the viewing angle control electrode 213 in the bias state is a periodic ac voltage, wherein the waveform of the periodic ac voltage may be specifically a square wave, a sine wave, a triangular wave, a sawtooth wave, or the like.
In one embodiment, the detection control module 13 includes a first gamma reference circuit group and a second gamma reference circuit group, and the gamma reference voltage signals Vn output by the first gamma reference circuit group and the second gamma reference circuit group have different voltage differences (hereinafter referred to as maximum voltage differences Va-Vb) between the gamma reference voltages with the highest voltage value and the lowest voltage value. Illustratively, the maximum differential pressure Va-Vb output by the first reference gamma circuit group is 7.1V, and the maximum differential pressure Va-Vb output by the second reference gamma circuit group is 0.2V. In other embodiments, the maximum voltage difference Va-Vb output by the first reference gamma circuit group and the maximum voltage difference Va-Vb output by the second reference gamma circuit group may be set to different values, so that different dark frames can be driven.
Specifically, referring to fig. 2 and fig. 3, the detection control module 13 can selectively switch the corresponding reference gamma circuit group through the internal switch switching unit 132, so as to output the corresponding gamma reference voltage signal Vn to drive the display panel to display different frame states, so as to insert the dark frame.
Illustratively, when the display device is in the wide viewing angle mode or the first narrow viewing angle sub-mode, the switch switching unit 132 selects the first reference gamma circuit group to operate, and the maximum voltage difference Va-Vb of the gamma reference voltage signal Vn is kept unchanged; when the mode is switched to the second narrow viewing angle sub-mode, the switch switching unit 132 switches the reference gamma circuit group once every other frame, for example, the odd frame selects the first reference gamma circuit group to work, the even frame selects the second reference gamma circuit group to work, and in a frame where the maximum voltage difference Va-Vb of the gamma reference voltage signal Vn is reduced, the liquid crystal screen displays the degree close to the dark state display, so that the insertion of a dark state frame by one frame is realized.
In other embodiments, the insertion of the dark state frames may also be at other frame insertion frequencies, such as every 2 frames, every 3 frames, or every 4 frames, and so on.
As shown in the timing diagram of fig. 5, the polarity of the source driving signal S is inverted at intervals, so that the problem of polarization of liquid crystal molecules in the display device is effectively avoided. Illustratively, in the timing sequence of the second narrow viewing angle sub-mode, for positive polarity frames during the time periods t1, t5 and t9, the maximum voltage difference Va-Vb of the gamma reference voltage signal Vn is 7 v; the time periods of t3, t7 and t11 are negative polarity frames, and the maximum voltage difference Va-Vb of the gamma reference voltage signal Vn is 7 v; the maximum voltage difference Va-Vb of the gamma reference voltage signal Vn is reduced to 0.2v during the time periods t2, t4, t6, t8, t10 and t12, and the display screen is displayed as a dark frame corresponding to the reduction of the source driving signal S level. And respectively inserting a dark frame between the positive frame and the negative frame of the liquid crystal display voltage to form bright-dark contrast between two adjacent frames of display images, wherein the display angle of the display device is further changed due to the change of the contrast ratio and is displayed as a second narrow-angle sub-mode.
In summary, with the above embodiments, the overall working steps of the display device are as shown in the flowchart of fig. 6:
the first step S1 is to default to the wide viewing angle mode after the display device is turned on, and then the second step S2 is entered;
the second step S2 is to input the HVA and CNVA signals from the front-end input module 11, and then the third step S3 is performed;
the third step S3 is to detect whether the HVA is high, if so, the fourth step S4 is entered, and if so, the fifth step S5 is entered;
the fourth step S4 shows a wide view mode, and returns to the second step S2;
the fifth step S5 is to adjust the viewing angle electrode voltage ACVcom by the detection control module 13, so as to change the voltage of the viewing angle control electrode 213 to a periodic ac voltage fluctuating around the common electrode voltage, and then the sixth step S6 is proceeded to;
the sixth step S6 detects whether the narrow viewing angle mode signal CNVA is at a high level, and if so, proceeds to the seventh step S7, and if so, proceeds to the eighth step S8;
the seventh step S7 shows the first narrow viewing sub-mode, go back to the second step S2;
the eighth step S8 inserts a dark frame according to the timing signal TSW1 outputted from the timing control module 12, and then the ninth step S9 is performed;
the ninth step S9 shows the second narrow viewing sub-mode, and returns to the second step S2.
It should be noted that the high level and the low level are relative concepts, and the specific level values of the high level and the low level are not limited in the present invention.
Through the steps, the display system can stably determine the display visual angle mode required by the user according to the display mode signal input by the user, so that the display terminal can display the corresponding visual angle mode. The display panel of the display device is a liquid crystal display panel, so that the advantages of good image quality, small volume, light weight, low driving voltage, low power consumption and no radiation can be taken into consideration, and the panel is also a mature panel in the market and has relatively low manufacturing and purchasing cost.
The three-view display driver and the display device provided by the invention can determine the required display view angle mode according to the input view angle control signal, and can provide three view angle modes, namely a wide view angle mode, a first narrow view angle sub-mode and a second narrow view angle sub-mode, so that the display terminal is driven to carry out corresponding display, and the requirement of a user on the instant environment is met. The wide and narrow visual angle is controllable so as to meet the peeping prevention effect, and meanwhile, the selection switching can be carried out along with the change of the visual angle, the requirements of various visual angles of users can be met, and the peeping prevention effect is excellent.
In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.
In this document, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms can be understood in a specific case to those of ordinary skill in the art.
As used herein, the ordinal adjectives "first", "second", etc., used to describe an element are merely to distinguish between similar elements and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.
It will be understood by those skilled in the art that all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a computer readable storage medium, and when executed, performs the steps including the above method embodiments. The foregoing storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A three-view display driver for driving a display panel, comprising:
a front-end input module for providing a view control signal to select a wide view mode, a first narrow view sub-mode or a second narrow view sub-mode;
the time sequence control module is connected with the front end input module and used for selectively outputting corresponding display code signals and time sequence signals through the received visual angle control signals;
the detection control module is connected with the front-end input module and the time sequence control module, and is used for receiving the visual angle control signal and the time sequence signal, and according to the selection of the visual angle control signal: outputting a viewing angle electrode voltage which is the same as a common electrode voltage when the wide viewing angle mode is selected, and outputting a viewing angle electrode voltage which is different from the common electrode voltage when the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode is selected to reduce a viewing angle; selecting the second narrow viewing angle sub-mode with a fixed time interval to output a dark state frame signal of a designated frame to insert a dark state frame, wherein the dark state frame signal comprises: reducing the voltage difference between each path of gamma reference voltage and the voltage of the common electrode according to the time sequence signal so as to reduce the voltage difference of the gamma reference voltage and insert a dark state frame;
and the display panel driving module is connected with the time sequence control module and the detection control module and used for receiving the display code signal, the visual angle electrode voltage and the dark state frame signal, outputting a source electrode driving signal to drive the display panel to display, and driving the display panel to display a dark state frame when receiving the dark state frame signal.
2. The three view display driver of claim 1, wherein the view control signal comprises a hybrid view mode signal and a narrow view mode signal, the hybrid view mode signal to select the wide view mode or the narrow view mode, the narrow view mode comprising the first narrow view sub-mode and the second narrow view sub-mode, the narrow view mode signal to select the first narrow view sub-mode or the second narrow view sub-mode.
3. The three-view display driver of claim 2, wherein the wide view mode is selected when the hybrid view mode signal is high; selecting the first narrow view sub-mode when the hybrid view mode signal is at a low level and the narrow view mode signal is at a high level; selecting the second narrow view sub-mode when the hybrid view mode signal is low level and the narrow view mode signal is low level.
4. The three-view display driver of claim 1, wherein the detection control module outputs the dark state frame signals of a given frame at fixed time intervals for one frame at intervals.
5. The three-view display driver of claim 1, wherein a voltage difference between a gamma reference voltage having a highest voltage value and a gamma reference voltage having a lowest voltage value among the gamma reference voltages having the lowered voltage differences is 0.2V or less.
6. The three-view display driver of claim 5, wherein the detection control module comprises a detection unit and a switch switching unit electrically connected to the detection unit, and when detecting that the view angle control signal selects the second narrow view angle sub-mode, the detection unit outputs a voltage difference control level of a specified frame to the switch switching unit at a fixed interval, so that the switch switching unit outputs the gamma reference voltage with a reduced voltage difference according to the voltage difference control level.
7. The three-view display driver of claim 6, wherein the switching unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first switching tube, a second switching tube, and a third switching tube; the first resistor is arranged between an input analog voltage and an output first gamma reference voltage in series, the second resistor is arranged between the output first gamma reference voltage and an input end of the second switching tube in series, the third resistor is arranged between the output first gamma reference voltage and the ground in series, the fourth resistor is arranged between the input analog voltage and an input end of the first switching tube in series, a control end of the second switching tube is electrically connected with an input end of the first switching tube, an output end of the second switching tube is grounded, and a control end of the first switching tube receives the input voltage difference control level; the fifth resistor is arranged between the input analog voltage and the output second gamma reference voltage in series, the sixth resistor is arranged between the output second gamma reference voltage and the input end of the third switching tube in series, the seventh resistor is arranged between the output second gamma reference voltage and the ground in series, the output end of the third switching tube is grounded, and the control end of the third switching tube receives the input voltage difference control level.
8. A display device, comprising at least one of the three-view display driver according to any one of claims 1 to 7 and a display panel, wherein the display panel comprises a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a liquid crystal layer disposed between the color filter substrate and the array substrate, and the color filter substrate is provided with a view control electrode for receiving a voltage of the view electrode.
9. The display device of claim 8, wherein the viewing angle electrode voltage is a direct current voltage in the wide viewing angle mode and a periodic alternating current voltage in the first narrow viewing angle sub-mode or the second narrow viewing angle sub-mode.
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| CN113589558B (en) * | 2020-04-30 | 2023-04-14 | 荣耀终端有限公司 | Screen peeping prevention method and related device |
| TWI738417B (en) * | 2020-07-10 | 2021-09-01 | 友達光電股份有限公司 | Display device and driving method thereof |
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