CN106448601B - Liquid crystal display device and common voltage driving method thereof in narrow viewing angle mode - Google Patents
Liquid crystal display device and common voltage driving method thereof in narrow viewing angle mode Download PDFInfo
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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
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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
- G09G3/3406—Control of illumination source
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Abstract
The invention provides a common voltage driving method of a liquid crystal display device in a narrow viewing angle mode, which comprises the following steps: outputting an AC common voltage with mixed amplitude characteristics to a common electrode of the liquid crystal display panel, wherein the AC common voltage with mixed amplitude characteristics takes an i + j frame picture as a driving cycle, and the amplitude of the AC common voltage output to the common electrode by the previous i frame picture is delta V 1 The amplitude of the AC common voltage outputted to the common electrode by the rest j frames is delta V 2 Where i and j are positive integers greater than or equal to 1, Δ V 1 And Δ V 2 Not equal. By adopting the alternating current public voltage driving scheme with the mixed amplitude characteristic in the narrow visual angle mode, the penetration rate and the display contrast can be improved on the premise that the visual angle can meet the expected requirement, and meanwhile, the overall power consumption of the module can be reduced. The invention also provides a liquid crystal display device.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device and a common voltage driving method thereof in a narrow viewing angle mode.
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.
Liquid crystal display devices are now gradually developed toward wide viewing angles, and wide viewing angles can be realized by using liquid crystal display devices of an in-plane switching mode (IPS) or a fringe field switching mode (FFS). However, in the current society, people pay more and more attention to protecting their privacy, and do not like to take out and share with people. In public places, the content is always expected to be kept secret when the user watches a mobile phone or browses a computer. Therefore, the display with single viewing angle mode has not been able to satisfy the user's requirement. In addition to the requirement of a wide viewing angle, there is also a need to be able to switch or adjust the display device to a narrow viewing angle mode where privacy is required.
The Hybrid Viewing Angle (HVA) is a display technology in which a liquid crystal display panel can be arbitrarily switched between a wide Viewing Angle and a narrow Viewing Angle according to actual conditions.
The difficulty of this technique is mainly focused on the narrow viewing angle mode. In the narrow viewing angle mode, in order to make the liquid crystal display panel have a better display effect, it is necessary to provide an in-plane common voltage (AC Vcom) having a periodic alternating current. For simplicity of explanation, the alternating common voltage here is assumed to be a periodic square wave, as shown in fig. 1, the in-plane common voltage (AC Vcom) having an alternating characteristic follows the frame synchronization Signal (STV) for one change period every two frames, and has a high potential V H1 And a low potential V L1 Amplitude (Δ V) 1 ) Is a V H1 -V L1 . According to the panel characteristics of the mixed visual angle technology in the narrow visual angle mode, the amplitude (delta V) is increased within a reasonable range 1 ) The viewing angle becomes narrow but the transmittance and the display contrast ratio are lowered, and if the contrast ratio is to be increased, the amplitude of the in-plane common voltage having the alternating current characteristic can be lowered. As shown in fig. 2, the amplitude (Δ V) at this time 2 ) Is a V H2 -V L2 And Δ V 2 Less than DeltaV 1 At this time, the transmittance and the display contrast ratio are correspondingly improved, but the display viewing angle in the narrow viewing angle mode is widened, so that the expected viewing angle requirement is not met.
Because both of the above two processing methods have corresponding disadvantages, the current solution is to adopt the driving method of the high-amplitude common voltage shown in fig. 1 for most pictures in the narrow viewing angle mode, and temporarily switch to the driving method of the low-amplitude common voltage shown in fig. 2 for a few pictures (such as pure black pictures) that are sensitive to contrast, however, this solution may cause the problem of non-uniform display effect of different pictures.
Disclosure of Invention
The invention aims to provide a liquid crystal display device and a common voltage driving method thereof in a narrow viewing angle mode, so that the transmittance and the display contrast can be improved on the premise that the viewing angle can meet the expected requirement.
The invention provides a common voltage driving method of a liquid crystal display device in a narrow viewing angle mode, which comprises the following steps:
outputting an AC common voltage with mixed amplitude characteristics to a common electrode of the liquid crystal display panel, wherein the AC common voltage with mixed amplitude characteristics takes an i + j frame picture as a driving cycle, and the amplitude of the AC common voltage output to the common electrode by the previous i frame picture is delta V 1 The amplitude of the AC common voltage outputted to the common electrode by the rest j frames is delta V 2 Where i and j are positive integers greater than or equal to 1,. DELTA.V 1 And Δ V 2 Are not equal.
Further, Δ V 2 Less than DeltaV 1 And i is greater than j to set the output amplitude to Δ V 1 As the main output amplitude, the output amplitude is Δ V 2 As the secondary output amplitude.
Further, Δ V 1 Less than DeltaV 2 And j is greater than i to set the output amplitude to Δ V 2 As the main output amplitude, the output amplitude is Δ V 1 As the secondary output amplitude.
Further, the alternating common voltage is a periodic square wave, a trapezoidal wave, a sine wave, a triangular wave or a sawtooth wave.
Further, in the narrow viewing angle mode, the display refresh rate is 120Hz, and the ac common voltage follows the frame synchronization signal for one change period every two frames.
Further, in the narrow viewing angle mode, the display refresh rate is 60Hz, and the ac common voltage follows the frame synchronization signal for one change period per frame.
The invention also provides a liquid crystal display device, which comprises a liquid crystal display panel and a public voltage driving circuit, wherein in the narrow viewing angle mode of the liquid crystal display device, the public voltage driving circuit outputs alternating public voltage with mixed amplitude characteristics to a public electrode of the liquid crystal display panel according to the public voltage driving method.
Further, the liquid crystal display device further comprises a backlight driving circuit, a main control chip and a time sequence control chip, wherein:
the time sequence control chip generates a frame synchronization signal;
the main control chip receives the frame synchronization signal generated by the time sequence control chip, generates a backlight driving numerical control signal after a series of internal processing, and simultaneously generates a public voltage driving numerical control signal;
the backlight driving circuit receives the backlight driving numerical control signal and adjusts the intensity of the backlight driving output signal output to the backlight source in real time to adjust the brightness of the backlight;
the public voltage driving circuit receives the public voltage driving numerical control signal and generates corresponding periodic alternating current public voltage with mixed amplitude in real time.
Further, the relationship of the backlight driving numerical control signal and the common voltage driving numerical control signal which are coordinated with each other in time is specifically as follows: when the common voltage driving numerical control signal shows a low amplitude characteristic, the backlight driving numerical control signal shows a relatively weak backlight driving in the same time period; when the common voltage driving numerical control signal exhibits a high amplitude characteristic, the backlight driving numerical control signal exhibits a relatively strong backlight driving during the same period of time.
Further, the liquid crystal display panel is a liquid crystal display panel adopting an in-plane switching mode or a fringe field switching mode.
According to the liquid crystal display device and the common voltage driving method thereof in the narrow viewing angle mode, the periodic alternating current common voltage (AC Vcom) with the mixed amplitude characteristic is output to the common electrode in the narrow viewing angle mode, and the method is used as an improvement scheme for the existing mixed viewing angle display technology with insufficient display contrast in the narrow viewing angle mode, so that the penetration rate and the display contrast can be improved on the premise that the viewing angle can meet the expected requirement, and meanwhile, the overall power consumption of a module can be reduced.
Drawings
Fig. 1 is a diagram of one of in-plane common voltage waveforms of a liquid crystal display device in a narrow viewing angle mode.
Fig. 2 is a diagram of another in-plane common voltage waveform of the liquid crystal display device in the narrow viewing angle mode.
Fig. 3 is a diagram of an in-plane common voltage waveform of the liquid crystal display device in the narrow viewing angle mode according to the first embodiment of the present invention.
Fig. 4 is a diagram of an in-plane common voltage waveform of a liquid crystal display device in a narrow viewing angle mode according to a second embodiment of the present invention.
Fig. 5 is a schematic block diagram of an lcd device according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
The embodiment of the present invention proposes an in-plane common voltage driving scheme of a liquid crystal display device in a narrow viewing angle mode, and such ac common voltage driving waveforms are shown in fig. 3, and are obtained by mixing two ac common voltages with different amplitudes and outputting the mixed ac common voltages to a common electrode 21 (fig. 5) of a liquid crystal display panel 20 (fig. 5) in different frame time-sharing manners.
As shown in fig. 3, an alternating common voltage (AC Vcom) having a mixed amplitude characteristic is output to the common electrode 21 of the liquid crystal display panel 20, the alternating common voltage having the mixed amplitude characteristic having an i + j frame picture as one driving cycle, wherein the amplitude of the alternating common voltage output to the common electrode 21 for the previous i frame picture is V H1 -V L1 ＝△V 1 The amplitude of the AC common voltage outputted to the common electrode 21 for the remaining j frames is V H2 -V L2 ＝△V 2 Wherein i and j are positive integers greater than or equal to 1, Δ V 1 And Δ V 2 Not equal, in this embodiment Δ V 2 Less than DeltaV 1 But is not limited thereto, and may be Δ V in other embodiments 1 Less than DeltaV 2 。
Since the display viewing angle in the narrow viewing angle mode is the first factor, the display contrast is inferior, so when Δ V 2 Less than DeltaV 1 Then, the output amplitude is set to be delta V 1 As the main output amplitude, the output amplitude is Δ V 2 As secondary output amplitude, i is greater than j (e.g., i =4,j =2 i =3,j =1, etc.; therefore when Δ V 1 Less than DeltaV 2 Then, the output amplitude is set to be delta V 2 As the main output amplitude, the output amplitude is Δ V 1 As a secondary output amplitude, i.e., j is greater than i (e.g., j =4, i =2, j =3, i =1, etc.); therefore, the display visual angle can be basically not influenced because most of frame driving voltages are output to high amplitudes, and meanwhile, the inserted few frames have driving voltages with low amplitudes, and the penetration rate and the display contrast can be improved through time-sharing compensation. Appropriate values of i and j can be positioned through continuous actual debugging, so that the one-sided influence and the defect caused by the driving of the common voltage with the single amplitude are made up to the greatest extent.
For simplicity of description, the ac common voltage is assumed to be a periodic square wave, but is not limited thereto, and may be a periodic trapezoidal wave, a sinusoidal wave, a triangular wave, or a sawtooth wave, and the voltage waveform may be relatively complex in actual cases.
Fig. 3 shows that the in-plane common voltage following frame synchronization Signal (STV) having an alternating current characteristic is one change period every two frames for the case where the display refresh rate is 120Hz (i.e., 120 pictures per second) in the narrow viewing angle mode. If the display refresh rate is 60Hz in the narrow viewing angle mode (i.e. 60 frames are refreshed per second), it is only necessary to combine every two frames in fig. 3 into one frame to consider, that is, the in-plane common voltage with the ac characteristic follows the frame synchronization Signal (STV) every frame at this time as a change period, as shown in fig. 4.
Fig. 5 is a schematic block diagram of a liquid crystal display device according to an embodiment of the present invention, where the liquid crystal display device includes a liquid crystal display panel 20, a common voltage driving circuit 30, a backlight driving circuit 40, other driving circuits 50, a main control chip 60, and a timing control chip 70.
A timing control chip 70 for generating a frame synchronization signal (g) and a series of timing signals (f) including the frame synchronization signal;
a main control chip 60 for receiving the frame synchronization signal (g) generated by the timing control chip 70, generating a backlight driving numerical control signal (d) after a series of internal processes, and generating a common voltage driving numerical control signal (e);
a backlight driving circuit 40 for receiving the backlight driving numerical control signal (d) and adjusting the intensity of the backlight driving output signal (a) outputted to the backlight source 22 in real time to adjust the brightness of the backlight;
a common voltage driving circuit 30 for receiving the common voltage driving numerical control signal (e) and generating a corresponding periodic alternating common voltage (b) having a mixed amplitude in real time;
a further driving circuit 50 receiving the timing signal (f) and generating a plurality of further driving signals (c) required for the liquid crystal display panel 20; the other driving circuit 50 includes, for example, a gate driving circuit, a source driving circuit, and the like, and the other driving signal includes, for example, a scanning driving signal, a data voltage signal, and the like.
Further, the backlight driving numerical control signal (d) and the common voltage driving numerical control signal (e) generated by the main control chip 60 have a mutually coordinated relationship in time, which can be specifically described as: when the common voltage driving numerical control signal (e) exhibits a low amplitude characteristic, the backlight driving numerical control signal (d) exhibits a relatively weak backlight driving during the same period; when the common voltage driving numerical control signal (e) exhibits a high amplitude characteristic, the backlight driving numerical control signal (d) exhibits a relatively strong backlight driving during the same period of time. This is because the low amplitude characteristic of the common voltage increases the display contrast in the corresponding period, and the reduction of the backlight driving in this period compensates and prevents slight flicker which may be caused by a momentary abrupt change in contrast, so that the display effect is maintained uniform, and at the same time, since the average driving strength of the backlight is reduced, a part of the entire output power consumption can be saved.
The liquid crystal display panel 20 is preferably an In-Plane Switching (IPS) or Fringe Field Switching (FFS) liquid crystal display panel In which the common electrode 21 and the pixel electrode (not shown) are formed on the same substrate (i.e., a thin film transistor array substrate, not shown) and liquid crystal molecules are rotated In a Plane substantially parallel to the substrate to obtain a wider viewing angle. The liquid crystal display panel 20 can be switched between a wide viewing angle mode in which a voltage applied to the common electrode 21 is a direct current common voltage (DC Vcom) and a narrow viewing angle mode; when switching to the narrow viewing angle mode when a peep-proof requirement is required, the voltage applied to the common electrode 21 is the above-mentioned alternating common voltage (AC Vcom) having the mixed amplitude characteristic. The direct current common voltage (DC Vcom) and the alternating current common voltage (AC Vcom) are both generated by the common voltage driving circuit 30 and supplied to the common electrode 21 of the liquid crystal display panel 20.
According to the liquid crystal display device and the common voltage driving method in the narrow viewing angle mode, provided by the embodiment of the invention, the periodic alternating current common voltage (AC Vcom) with the mixed amplitude characteristic is output to the common electrode in the narrow viewing angle mode, and the periodic alternating current common voltage (AC Vcom) is used as an improvement scheme for the existing mixed viewing angle display technology with insufficient display contrast in the narrow viewing angle mode, so that the penetration rate and the display contrast can be simultaneously improved on the premise that the viewing angle can meet the expected requirement, and meanwhile, the overall power consumption of a module can be reduced.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (8)
1. A common voltage driving method of a liquid crystal display device in a narrow viewing angle mode, comprising the steps of:
outputting an AC common voltage having a mixed amplitude characteristic to a common electrode (21) of a liquid crystal display panel (20), the AC common voltage having the mixed amplitude characteristic having i + j frame pictures as one driving cycle, wherein the amplitude of the AC common voltage outputted to the common electrode (21) from the previous i frame pictures is DeltaV 1 The remaining j frame images are output to the AC common power of the common electrode (21)Amplitude of the pressure is DeltaV 2 Where i and j are positive integers greater than or equal to 1,. DELTA.V 1 And Δ V 2 Not equal;
△V 2 less than DeltaV 1 And i is greater than j to set the output amplitude to Δ V 1 As the main output amplitude, the output amplitude is Δ V 2 As a secondary output amplitude; or, Δ V 1 Less than DeltaV 2 And j is greater than i to set the output amplitude to Δ V 2 As the main output amplitude, the output amplitude is Δ V 1 As a secondary output amplitude;
when the output amplitude of the alternating current public voltage is the main output amplitude, the backlight driving circuit of the liquid crystal display device outputs relatively strong backlight driving; when the output amplitude of the alternating current public voltage is the secondary output amplitude, the backlight driving circuit outputs relatively weak backlight driving.
2. The method of claim 1, wherein the AC common voltage is a periodic square wave, trapezoidal wave, sine wave, triangular wave or sawtooth wave.
3. The common voltage driving method of the liquid crystal display device in the narrow viewing angle mode according to claim 1, wherein in the narrow viewing angle mode, the display refresh rate is 120Hz, and the ac common voltage follows the frame synchronization signal for a change period every two frames.
4. The common voltage driving method of the liquid crystal display device of claim 1, wherein in the narrow viewing angle mode, the display refresh rate is 60Hz, and the ac common voltage follows the frame synchronization signal for one change period per one frame.
5. A liquid crystal display device comprising a liquid crystal display panel (20) and a common voltage driving circuit (30), wherein the liquid crystal display device is in a narrow viewing angle mode, the common voltage driving circuit (30) outputs an alternating common voltage having a mixed amplitude characteristic to a common electrode (21) of the liquid crystal display panel (20) in accordance with the common voltage driving method as set forth in any one of claims 1 to 4.
6. The liquid crystal display device according to claim 5, further comprising a backlight driving circuit (40), a main control chip (60), and a timing control chip (70), wherein:
the timing control chip (70) generates a frame synchronization signal (g);
the main control chip (60) receives the frame synchronization signal (g) generated by the time sequence control chip (70), generates a backlight driving numerical control signal (d) after a series of internal processing, and simultaneously generates a common voltage driving numerical control signal (e);
the backlight driving circuit (40) receives the backlight driving numerical control signal (d) and adjusts the intensity of the backlight driving output signal (a) output to the backlight source (22) in real time to adjust the brightness of the backlight;
the common voltage drive circuit (30) receives the common voltage drive digital control signal (e) and generates a corresponding periodic alternating common voltage (b) having a mixed amplitude in real time.
7. The lcd apparatus of claim 6, wherein the backlight driving numerical control signal (d) and the common voltage driving numerical control signal (e) have a temporally coordinated relationship, specifically: when the common voltage driving numerical control signal (e) exhibits a low amplitude characteristic, the backlight driving numerical control signal (d) exhibits a relatively weak backlight driving in the same period of time; when the common voltage driving numerical control signal (e) exhibits a high amplitude characteristic, the backlight driving numerical control signal (d) exhibits a relatively strong backlight driving during the same period of time.
8. The liquid crystal display device according to claim 5, wherein the liquid crystal display panel (20) is a liquid crystal display panel employing an in-plane switching mode or a fringe field switching mode.
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| CN107357057B (en) * | 2017-08-07 | 2020-05-01 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and narrow visual angle waveform self-adaptive adjustment method thereof |
| CN107342063B (en) * | 2017-08-11 | 2020-12-01 | 昆山龙腾光电股份有限公司 | Common voltage driving circuit and display device |
| TWI643179B (en) * | 2017-12-29 | 2018-12-01 | 友達光電股份有限公司 | Display apparatus and driving method of display panel thereof |
| CN108873417B (en) * | 2018-08-28 | 2021-06-22 | 昆山龙腾光电股份有限公司 | Driving method of liquid crystal display device |
| WO2020093216A1 (en) * | 2018-11-05 | 2020-05-14 | 昆山龙腾光电股份有限公司 | Driving method for liquid crystal display device |
| CN109559690B (en) * | 2018-12-04 | 2021-01-15 | 昆山龙腾光电股份有限公司 | Gamma voltage generating circuit, method and liquid crystal display device |
| CN111243537B (en) * | 2020-01-16 | 2022-03-01 | 昆山龙腾光电股份有限公司 | Common voltage generating circuit, method and display device |
| CN116704970B (en) * | 2023-08-04 | 2023-10-24 | 南京芯视元电子有限公司 | Correction system and method for display signal processing |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |