CN107967906B - Liquid crystal display device based on reverse electrode drive circuit - Google Patents
Liquid crystal display device based on reverse electrode drive circuit Download PDFInfo
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- CN107967906B CN107967906B CN201810034832.3A CN201810034832A CN107967906B CN 107967906 B CN107967906 B CN 107967906B CN 201810034832 A CN201810034832 A CN 201810034832A CN 107967906 B CN107967906 B CN 107967906B
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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
- G09G3/3614—Control of polarity reversal in general
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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
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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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
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a liquid crystal display device based on a reverse electrode driving circuit, which comprises a display control circuit, a liquid crystal display panel and the reverse electrode driving circuit which are connected in pairs, wherein the liquid crystal display panel comprises a pixel array, a scanning driving circuit and a data driving circuit, and the scanning driving circuit and the data driving circuit are respectively connected with the pixel array through a scanning line and a data line. The invention realizes the suppression of the flicker appearing in each area of the display picture by applying the reverse voltage changing between two levels to the reverse electrode in each preset frame period; meanwhile, the voltage level applied to the data line can be switched, so that the design simplification of the reverse voltage circuit is realized; and a local driving mode is adopted, different rewriting frequencies are adopted for different display areas, and the applied voltage level is switched according to the rewriting frequencies, so that the flicker phenomenon of each area of the display screen can be effectively inhibited, and the display quality of images is improved.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal display device based on a reverse electrode driving circuit.
Background
Some liquid crystal display devices have a driving function of rewriting a specific portion of the liquid crystal display panel at a lower frequency. This way of partial driving is adopted when a moving image is displayed in the middle area of the screen while a still image is taken as a background image at the top and bottom of the moving image display area. For example, when a moving image is rewrite-displayed at 60hz, a still image is rewrite-displayed at 5 hz. The number of times the driving circuit is operated is reduced by setting a lower rewriting frequency for the still image display area, thereby reducing the power consumption of the liquid crystal display device.
The prior art reports relate to a liquid crystal display device using local driving, which mainly uses half of the frame frequency to suppress the flicker phenomenon, and specifically, when k local display areas are rewritten on the display screen at the normal frequency in the period of one frame, the potential of the electrode is changed for 2k times.
In general, when a liquid crystal display device is used, in order to suppress flicker, a process of adjusting a reverse voltage of a liquid crystal panel (a voltage applied to a reverse electrode) is mainly performed. However, the optimum level of the reverse voltage varies depending on the rewriting frequency. Therefore, in the conventional liquid crystal display device, a flicker phenomenon occurs due to a difference in an optimal reverse voltage applied between the moving image display region and the still image display region at the time of the partial driving. Accordingly, an object of the present invention is to provide a liquid crystal display device in which flicker is suppressed during local driving.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid crystal display device based on a reverse electrode driving circuit, wherein a specific reverse voltage is applied to a reverse electrode of a liquid crystal display panel, the reverse voltage is changed between two levels in each preset period, and the voltage level applied to a source signal line is switched through the rewriting frequency of each area, so that the flicker phenomenon is effectively inhibited, and the display quality of an image is improved.
The technical solution for realizing the purpose of the invention is as follows:
a liquid crystal display device based on a reverse electrode driving circuit is characterized by comprising a display control circuit, a liquid crystal display panel and a reverse electrode driving circuit which are connected in pairs, wherein the liquid crystal display panel comprises a pixel array, a scanning driving circuit and a data driving circuit, and the scanning driving circuit and the data driving circuit are respectively connected with the pixel array through scanning lines and data lines; the display control circuit receives an external control signal C0 and a first data signal D0, and sends a first control signal C1 to the scan driving circuit, a second control signal C2 and a second data signal DT to the data driving circuit, and a third control signal C3 to the reverse electrode driving circuit after processing.
Furthermore, the liquid crystal display device based on the reverse electrode driving circuit further comprises a first glass substrate, a second glass substrate and internal liquid crystal substances, wherein m scanning lines G L1-G L m which are distributed in parallel, n data lines S L1-S L n which are distributed in parallel and m × n pixel circuits P are arranged on the first glass substrate, the scanning lines and the data lines are respectively connected with the scanning driving circuit and the data driving circuit and vertically intersect with the pixel circuits P, each pixel circuit P is connected with one scanning line and one data line, the pixel circuits P are arranged in the pixel array, reverse electrodes which correspond to the pixel circuits P one by one are arranged on the second glass substrate and are connected with the reverse electrode driving circuit, the reverse electrode driving circuit applies specific voltage to the reverse electrodes, and the internal liquid crystal substances are distributed between the first glass substrate and the second glass substrate.
Furthermore, each pixel circuit P of the liquid crystal display device based on the reverse electrode driving circuit of the present invention includes one or more thin film transistors TFT, and a conductive layer of the thin film transistor TFT is an amorphous silicon TFT or an indium gallium zinc oxide IGZO semiconductor.
Further, the liquid crystal display device based on the reverse electrode driving circuit of the present invention, the display control circuit 1 includes a display control unit, a scanning driving control unit, a storage unit and a gamma correction control unit, the display control unit is connected with the scanning driving control unit, the storage unit and the gamma correction control unit; the display control unit receives and processes the external control signal C0 and the first data signal D0, and stores the second control signal C2 and the second data signal DT to the storage unit, and the storage unit outputs the second control signal C2 and the second data signal DT to the data driving circuit; the display control unit sends a first control signal C1 to the scanning driving control unit, and the scanning driving control unit outputs the signal to the scanning driving circuit; the display control unit transmits the signal FC to the gamma correction control unit, which simultaneously receives and selects the input voltages Va and Vb and outputs the reference voltages V1 to Vx to the data driving circuit.
Further, the liquid crystal display device based on the reverse electrode driving circuit of the present invention, the data driving circuit includes an interface circuit, a linear buffer, a latch circuit, a level conversion circuit, a D/a converter, and an output buffer connected in sequence, the interface circuit receives the second control signal C2 and the second data signal DT and writes the second data signal DT into the linear buffer, the latch circuit latches the second data signal DT that has been written into the linear buffer and outputs a voltage to the level conversion circuit, the level conversion circuit converts the output voltage of the latch circuit into a voltage required by the D/a converter and outputs, the D/a converter converts the output voltage of the level conversion circuit into an analog signal as a reference voltage of the gamma correction control unit and writes into the pixel array through the output buffer and the data signal lines S L1 to S L n.
Further, in the liquid crystal display device based on the reverse electrode driving circuit, the output buffer is a voltage follower.
Further, in the liquid crystal display device based on the reverse electrode driving circuit of the present invention, the control signal C0 includes a flag signal for normal driving or local driving, a configuration signal for local driving, and a line field synchronization signal; the first control signal C1 includes a gate start pulse signal, a gate clock signal, and a gate enable signal; the second control signal C2 includes a source start pulse signal, a source clock signal, and a latch enable signal; the second data signal DT is the same signal as the first data signal D0 or a signal obtained by processing the first data signal D0 by the display control circuit.
Further, the liquid crystal display device based on the reverse electrode driving circuit of the invention, the liquid crystal display panel is divided into a moving image display area, a first static image display area and a second static image display area, scanning lines G L1 to G L p-1 are connected with the first static image display area, scanning lines G L p to G L q-1 are connected with the moving image display area, scanning lines G L q to G L m are connected with the second static image display area, and 1 < p < q < m, wherein p, q and m are integers.
Further, in the liquid crystal display device based on the counter electrode driving circuit of the present invention, the rewriting frequency of the moving image display area is larger than the rewriting frequencies of the first still image display area and the second still image display area.
Further, in the liquid crystal display device based on the reverse electrode driving circuit of the present invention, the reverse voltage is a voltage which switches between high and low levels in one frame period.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the liquid crystal display device of the present invention applies a reverse voltage varying between two levels to a reverse electrode in each preset frame period, achieving suppression of flicker occurring in each region of a display screen; meanwhile, the voltage level applied to the data line can be switched, so that the design simplification of the reverse voltage circuit is realized;
2. the liquid crystal display device adopts a local driving mode, adopts different rewriting frequencies aiming at different display areas, and switches the applied voltage level according to the rewriting frequencies, so that the flicker phenomenon of each area of the display screen can be effectively inhibited, and the display quality of images is improved.
Drawings
Fig. 1 is a general schematic diagram of a liquid crystal display device of the present invention;
FIG. 2 is a schematic diagram of detailed components of a liquid crystal display device of the present invention;
fig. 3 is a schematic diagram of a partially driven liquid crystal display device;
FIG. 4 is a timing diagram of a partially driven liquid crystal display device;
fig. 5 is a schematic diagram of data voltages of the liquid crystal display device;
fig. 6 is a characteristic diagram of the liquid crystal display device.
Reference signs mean: 1: display control circuit, 2: liquid crystal display panel, 3: pixel array, 4: scan drive circuit, 5: data driving circuit, 6: counter electrode drive circuit, 11: display control unit, 12: scanning drive control unit, 13: storage unit, 14: gamma correction control unit, 21: interface circuit, 22: linear buffer, 23: latch circuit, 24: level conversion circuit, 25: d/a converter, 26: output buffer, 71: moving image display area, 72: first still image display area, 73: a second still image display area.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A liquid crystal display device based on a reverse electrode driving circuit is disclosed, as shown in figure 1, comprising a display control circuit 1, a liquid crystal display panel 2 and a reverse electrode driving circuit 6 which are connected in pairs, wherein the liquid crystal display panel 2 comprises a pixel array 3, a scanning driving circuit 4 and a data driving circuit 5, the scanning driving circuit 4 and the data driving circuit 5 are respectively connected with the pixel array 3 through a scanning line and a data line; the display control circuit 1 receives an external control signal C0 and a first data signal D0, processes the signals and sends a first control signal C1 to the scan driving circuit 4, a second control signal C2 and a second data signal DT to the data driving circuit 5, and a third control signal C3 to the counter electrode driving circuit 6.
The liquid crystal display panel 2 further includes a first glass substrate on which m scan lines G L1 to G L m, n data lines S L1 to S L n, and m × n pixel circuits P are disposed in parallel, and m and n are positive integers greater than or equal to 2, a second glass substrate on which counter electrodes are disposed in one-to-one correspondence with the pixel circuits P and connected to the counter electrode driving circuit 6, and an internal liquid crystal substance which applies a specific voltage to the counter electrodes is disposed between the first glass substrate and the second glass substrate, the counter voltages are voltages switched at high and low levels within one frame period, each pixel circuit P includes an amorphous or a plurality of thin film transistors igtfts, and igtfts are turned off in comparison with IGZO thin film transistors or TFTs.
As shown in fig. 2, the display control circuit 1 includes a display control unit 11, a scan drive control unit 12, a storage unit 13, and a gamma correction control unit 14, the display control unit 11 is connected to the scan drive control unit 12, the storage unit 13, and the gamma correction control unit 14, the display control unit 11 receives and processes an external control signal C0 and a first data signal D0, and stores a second control signal C2 and a second data signal DT in the storage unit 13, the storage unit 13 outputs the second control signal C2 and the second data signal DT to the data drive circuit 5, the display control unit 11 transmits the first control signal C1 to the scan drive control unit 12, the scan drive control unit 12 outputs the signals to the scan drive circuit 4, the scan drive circuit 4 selects G L1 to G L m by the control signal C1 to scan the liquid crystal display panel, the display control unit 11 transmits a signal FC to the gamma correction control unit 14, and the gamma correction control unit 14 receives and selects input voltages Va and Vb simultaneously, and outputs reference voltages V1 to the Vx drive circuit 5.
As shown in fig. 2, the data driving circuit 5 includes an interface circuit 21, a linear buffer 22, a latch circuit 23, a level conversion circuit 24, a D/a converter 25, and an output buffer 26 connected in this order, the interface circuit 21 receives a second control signal C2 and a second data signal DT and writes the second data signal DT into the linear buffer 22, the latch circuit 23 latches the second data signal DT that has been written into the linear buffer 22 and outputs a voltage to the level conversion circuit 24, the level conversion circuit 24 converts the output voltage of the latch circuit 23 into a voltage required by the D/a converter 25 and outputs it, the D/a converter 25 converts the output voltage of the level conversion circuit 24 into an analog signal as a reference voltage of the gamma correction control unit 14 and writes it into the pixel array 3 through the output buffer 26 and data signal lines S L1 to S L n the output buffer 26 is a voltage follower, and in this way, the data driving circuit 5 outputs voltage data onto the data lines of S L1 to S L n through the data signal lines DT.
When the scanning driving circuit 4 selects the scanning line G L i of the i-th row to be turned on, n pixel circuits of the i-th row are selected, and at this time, the data driving circuit 5 writes n voltage data into the pixel circuits through the data lines of S L1 to S L n, respectively, the luminance of the pixel circuits P (luminance of the pixels) is changed according to the difference between the data voltage written into the pixel circuits P individually and the counter voltage common to all the pixel circuits P, and therefore, by writing appropriate data voltages to all the pixel circuits P through the scanning driving circuit 4 and the data driving circuit 5, corresponding images can be displayed on the liquid crystal display panel 2.
The control signal C0 includes a flag signal for normal driving or local driving, a configuration signal for local driving, and a line field sync signal; the first control signal C1 includes a gate start pulse signal, a gate clock signal, and a gate enable signal; the second control signal C2 includes a source start pulse signal, a source clock signal, and a latch enable signal; the second data signal DT is the same signal as the first data signal D0 or a signal obtained by processing the first data signal D0 by the display control circuit 1.
As shown in fig. 3, the liquid crystal display panel 2 is divided into a moving image display region 71, a first still image display region 72, and a second still image display region 73, scanning lines G L1 to G L P-1 connect the first still image display region 72, scanning lines G L P to G L q-1 connect the moving image display region 71, and scanning lines G L q to G L m connect the second still image display region 73, with 1 < P < q < m, P, q, and m being integers, wherein the rewriting frequency of the moving image display region 71 is greater than the rewriting frequencies of the first still image display region 72 and the second still image display region 73, the moving image display region being different from the rewriting frequency of the still image display region (the frequency of rewriting data voltage to the pixel circuit P), the rewriting frequency of the moving image display region 71 being set relatively high, the rewriting frequencies of the still image display regions 72 and 73 being set relatively low, in one embodiment of the present invention, the rewriting frequency of the region 71 is set to 60hz, and the rewriting frequencies of the regions 72 and 73 are set to 5 hz.
Fig. 4 is a timing chart showing voltage changes on scanning lines and signal lines when the partial drive mode is employed, specifically, voltage changes on scanning lines G L to G L m and data lines S L when the display screen employs the partial drive display, the frame period is classified into a frame period in which the entire screen is rewritten and a frame period in which only the moving image display area is rewritten (hereinafter, the former is referred to as an entire rewriting period and the latter is referred to as a partial rewriting period) when the partial drive mode is employed, the first period is an entire rewriting period and the second period is a partial rewriting period in fig. 4, when the rewriting frequency of the moving image display area is 60Hz, the rewriting frequency of the still image display area is 5Hz, 11 partial rewriting periods continue to occur during a period from the entire rewriting period until the next entire rewriting period occurs, the frame period is divided into m line periods, in the entire rewriting period, the voltages on scanning lines G6311 to G632 m are sequentially changed to high level in each line period, specifically, the scanning lines G6323 to G633 m are sequentially changed to high level in each line period, the scanning lines G463 to G L, the scanning lines G7 to G6342 are sequentially changed to high level in each line, and the scanning lines G7 to G9G 19 are sequentially changed to the scanning lines G9G 21 to the high level in the scanning lines p-G21.
When the liquid crystal display device described employs local drive, the levels of the data voltages applied to the data lines S L to S L n are switched according to the rewriting frequency set for each region of the display screen as shown in fig. 2, the display control unit 11 outputs to the gamma correction control unit 14a control signal FC representing the rewriting frequency of the region corresponding to the scanning line selected by the scanning drive circuit 4, the control signal FC may represent the rewriting frequency by a numerical value for example, for a moving image display region, the control signal FC is 60Hz, for a still image display region, the control signal FC is 5 Hz. in fig. 2, two voltages Va and Vb are supplied to the gamma correction control unit 14, the gamma correction control unit 14 selects one of the voltages Va and Vb based on the control signal FC, and generates the reference voltages V1 to Vx. based on the selected voltage, when the control signal FC indicates the rewriting frequency for the moving image display region, the gamma correction control unit 14 selects the voltage Va and generates the voltages V48 to 5848, particularly, when the voltages are applied to the reference voltages V6326 to 27V, the reference voltages V27V 2 to V27V, the reference voltages are used for the display region, when the moving image display region is changed from the same voltage V2V, V2V.
The data voltages for the moving image display area and the still image display area are shown in fig. 5. for the moving image display area, when the input data is changed in the range of 00H to 3FH, the data voltages are changed in the range of V1a to V7a and in the range of V8a to V14 a. when the voltage VMa is just between the lowest voltage V1a and the highest voltage V14a, the data voltages are changed in the range of the center of the intermediate voltage VMa. similarly, for the still image display area, when the input data is changed in the range of 00H to 3FH, the data voltages are changed in the range of V1b to V7b and in the range of V8b to V14 b. when the voltage VMb is just between the lowest voltage V1b and the highest voltage V14b, the data voltages are changed in the range of the intermediate voltage VMb as the center, as shown in fig. 4, the data voltages for each line S581 on the data line L are changed in the range of the intermediate voltage VMb, thus the moving image display area, the data voltages are changed in the range of vmn to vmn, as VMb, the intermediate voltage vm1 to vmn, the data voltage 638, which is shown in the still image display area, thus, the moving image display area, with the intermediate voltage VMb, which is changed in the range of the intermediate voltage vmn, which is changed in the data area, which is shown on the data line 2, which is shown on the intermediate voltage on the data line 582, and the data.
As shown in FIG. 6, which is a schematic diagram of the display characteristics of a liquid crystal panel, in FIG. 6, the horizontal axis represents a reverse voltage, and the vertical axis represents a flicker rate, which indicates the change of the flicker rate when the rewriting frequency is set to the equivalent of 60Hz and 40Hz, it can be seen that the flicker rate is the lowest when the rewriting frequency is 60Hz and the reverse voltage is 0V, in a liquid crystal display device, the reverse voltage with the lowest flicker rate is the best value, but the best reverse voltage is changed according to the rewriting frequency, when the rewriting frequency is 5Hz, the best reverse voltage is 0.09V lower than the best reverse voltage when the rewriting frequency is 60Hz, and thus, in a conventional locally driven liquid crystal display device, the best reverse voltage employed in the moving image display region is not the best for the still image display region, so that a flicker phenomenon occurs in the still image display region, the liquid crystal display device switches the levels of the voltage V1 to Vx according to the moving image display region or the still image display region, and switches the levels of the reference voltage V1 to Vx, 360, when the display voltage is higher than the still image display voltage, the display voltage is set to the same as the display voltage, and the reverse voltage is higher than the display voltage of the display voltage, thus, the display voltage of the still image display voltage, which is set by the display voltage of the display voltage, which is equal to the display voltage, and the display voltage of.
As described above, in the liquid crystal display device according to the embodiment of the present invention, the display control circuit 1 selects one voltage from a plurality of supply voltages according to the rewriting frequency, and generates the reference voltages V1 to Vx based on the selected voltage, thereby switching the levels of the reference voltages V1 to Vx according to the rewriting frequency, further, the data driving circuit 5 generates the voltages to be applied to the data lines S L to S L n using the reference voltages V1 to Vx as references, and thus, when the local driving is adopted, the levels of the voltages applied to the data lines S L to S L n are switched according to the rewriting frequency, and thus, the liquid crystal display device of the present embodiment switches the levels of the voltages applied to the data lines S L to S L n according to the rewriting frequency as well as the reverse voltage switching according to the rewriting frequency can obtain the same effect, and thus, when a display screen including regions having different rewriting frequencies is displayed by the local driving, the flicker phenomenon occurring in each region of the display screen can be suppressed, and when the power consumption of the display screen is further reduced by the semiconductor driving circuit, the liquid crystal display panel, which reduces the flicker phenomenon, and the flicker phenomenon is further, such that the liquid crystal display panel is reduced by the local driving circuit, and the liquid crystal display panel, the liquid crystal display device can be formed by the liquid crystal display panel, and the liquid crystal display panel.
A plurality of voltages are supplied to the display control circuit 1 to generate the reference voltages V1 to Vx, and the display control circuit 1 selects one voltage from the plurality of supplied voltages and generates the reference-based voltages V1 to Vx. Instead, a plurality of sets of voltages may be supplied to the display control circuit 1 to generate the reference voltages V1 to Vx, and the display control circuit 1 may select one set of voltages from the plurality of sets of supplied voltages and generate the reference voltages V1 to Vx based on the selected one set of voltages. For example, when a set of voltages includes a high-side voltage and a low-side voltage, the reference voltages V1 to Vx can be generated by providing the high-side voltage and the low-side voltage across the ladder resistor.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (9)
1. The liquid crystal display device based on the reverse electrode driving circuit is characterized by comprising a display control circuit (1), a liquid crystal display panel (2) and a reverse electrode driving circuit (6) which are connected in pairs, wherein the liquid crystal display panel (2) comprises a pixel array (3), a scanning driving circuit (4) and a data driving circuit (5), and the scanning driving circuit (4) and the data driving circuit (5) are respectively connected with the pixel array (3) through scanning lines and data lines; the display control circuit (1) receives an external control signal C0 and a first data signal D0, sends a first control signal C1 to the scanning driving circuit (4), sends a second control signal C2 and a second data signal DT to the data driving circuit (5) and sends a third control signal C3 to the reverse electrode driving circuit (6) after processing;
the display control circuit (1) comprises a display control unit (11), a scanning drive control unit (12), a storage unit (13) and a gamma correction control unit (14), wherein the display control unit (11) is connected with the scanning drive control unit (12), the storage unit (13) and the gamma correction control unit (14), the display control unit (11) receives and processes an external control signal C0 and a first data signal D0 and stores a second control signal C2 and a second data signal DT into the storage unit (13), the storage unit (13) outputs a second control signal C2 and a second data signal DT to the data drive circuit (5), the display control unit (11) sends the first control signal C1 to the scanning drive control unit (12), the scanning drive control unit (12) outputs the signals to the scanning drive circuit (4), the display control unit (11) sends signals FC to the gamma correction control unit (14), the control signals FC represent the rewriting frequency of a display area Vx 2 to Vx 27, Vx 5 and the display control unit generates a display frequency Vx V2 to Vx 5, the display area Vx 2 to Vx 5, the display area Vx 5 is used for displaying a high-Vx, and the display area Vx 5 is selected by the display control unit (14) when the display control unit (14) receives the display frequency Vx 2, the display frequency Vx 2 to generate the display frequency Vx 2 to the display frequency Vx 2, Vx 5, Vx 2 to the display frequency, the display frequency is higher than the display frequency, the display frequency of the display frequency, the display frequency of the display area Vx 2 to the display area selected by the display.
2. The opposite electrode driving circuit-based liquid crystal display device of claim 1, wherein the liquid crystal display panel (2) further comprises a first glass substrate on which m scanning lines G L1 to G L m are disposed in parallel, n data lines S L1 to S L n and m × n pixel circuits P are disposed in parallel, the scanning lines and the data lines are connected to the scanning driving circuit and the data driving circuit, respectively, and intersect perpendicularly to the pixel circuits P, each pixel circuit P is connected to one scanning line and one data line, the pixel circuits P are disposed in the pixel array (3), and a second glass substrate on which opposite electrodes are disposed in one-to-one correspondence with the pixel circuits P, the opposite electrodes are connected to the opposite electrode driving circuit (6), the opposite electrode driving circuit (6) applies a specific voltage to the opposite electrodes, and an internal liquid crystal substance is disposed between the first glass substrate and the second glass substrate.
3. The counter electrode driving circuit-based liquid crystal display device according to claim 2, wherein each pixel circuit P includes one or more thin film transistors TFT, and a conductive layer of the thin film transistors TFT is an amorphous silicon TFT or an indium gallium zinc oxide IGZO semiconductor.
4. The liquid crystal display device according to claim 1, wherein the data driving circuit (5) comprises an interface circuit (21), a linear buffer (22), a latch circuit (23), a level conversion circuit (24), a D/a converter (25) and an output buffer (26) connected in sequence, the interface circuit (21) receives the second control signal C2 and the second data signal DT and writes the second data signal DT in the linear buffer (22), the latch circuit (23) latches the second data signal DT that has been written in the linear buffer (22) and outputs the voltage to the level conversion circuit (24), the level conversion circuit (24) converts an output voltage of the latch circuit (23) into a voltage required by the D/a converter (25) and outputs the voltage, the D/a converter (25) converts an output voltage of the level conversion circuit (24) into an analog signal as a reference voltage of the gamma correction control unit (14) and writes the analog signal into the pixel array S633 n through the output buffer (26) and the data signal line S L to S L).
5. The counter electrode driving circuit-based liquid crystal display device according to claim 4, wherein the output buffer (26) is a voltage follower.
6. The opposite electrode driving circuit-based liquid crystal display device of claim 1, wherein the control signal C0 includes a flag signal for normal driving or local driving, a configuration signal for local driving, and a line field sync signal; the first control signal C1 includes a gate start pulse signal, a gate clock signal, and a gate enable signal; the second control signal C2 includes a source start pulse signal, a source clock signal, and a latch enable signal; the second data signal DT is the same signal as the first data signal D0 or a signal obtained by processing the first data signal D0 by the display control circuit (1).
7. The liquid crystal display device based on the counter electrode driving circuit according to claim 1, wherein the liquid crystal display panel (2) is divided into a moving image display region (71), a first still image display region (72) and a second still image display region (73), scanning lines G L1 to G L p-1 connect the first still image display region (72), scanning lines G L p to G L q-1 connect the moving image display region (71), scanning lines G L q to G L m connect the second still image display region (73), and 1 < p < q < m, p, q, m being integers.
8. The counter electrode driving circuit-based liquid crystal display device according to claim 7, wherein the rewriting frequency of the moving image display area (71) is greater than the rewriting frequencies of the first still image display area (72) and the second still image display area (73).
9. The liquid crystal display device according to claim 2, wherein the reverse voltage is a voltage for switching between high and low levels within one frame period, and in particular, the reverse voltage of the still image display region is set to be △ V lower than the reverse voltage of the moving image display region.
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| KR102072781B1 (en) * | 2012-09-24 | 2020-02-04 | 삼성디스플레이 주식회사 | Display driving method and integrated driving appratus thereon |
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