EP1598806A1 - Procédé et dispositif de commande d'un affichage à cristaux liquides - Google Patents

Procédé et dispositif de commande d'un affichage à cristaux liquides Download PDF

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Publication number
EP1598806A1
EP1598806A1 EP04011941A EP04011941A EP1598806A1 EP 1598806 A1 EP1598806 A1 EP 1598806A1 EP 04011941 A EP04011941 A EP 04011941A EP 04011941 A EP04011941 A EP 04011941A EP 1598806 A1 EP1598806 A1 EP 1598806A1
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Prior art keywords
voltage
instant
gate
output
line
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German (de)
English (en)
Inventor
Yuh-Ren Shen
Cheng-Jung Chen
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VastView Technology Inc
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VastView Technology Inc
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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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • 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
    • 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

Definitions

  • the present invention generally relates to the liquid crystal display, and more specifically to a device and method for driving the liquid crystal display.
  • LCD liquid crystal display
  • CTR cathode ray tube
  • LED light emitting diode
  • an LCD is made by two glass substrates with specially processed surfaces and liquid crystal molecules interposed therebetween.
  • the orientation, and therefore the transparency, of the liquid crystal molecules would vary accordingly.
  • a kind of backlight has to be employed. As the light radiated from the backlight passes through the liquid crystal molecules with different transparency, an image is thereby displayed.
  • a TFT LCD is a layer of liquid crystal interposed between two glass substrates.
  • Color filters are installed on one of the glass substrates and transistors are built into the other glass substrate.
  • the transistors function as switches and control the voltages applied on the liquid crystal molecules. When the transistors are turned on and voltages are applied, the liquid crystal molecules will have corresponding orientations and transparencies.
  • Each pixel of the LCD display therefore has a specific brightness.
  • the color filters attached to the glass substrate give each pixel the three colors red, green, and blue. These pixels exhibiting the colors red, green, and blue constitute the image displayed on the LCD.
  • the LCD technology has advantages that are not available from the conventional CRT and existing LED display technologies.
  • the LCD display does have its own limitations.
  • the liquid crystal molecules develop corresponding orientations and therefore a texture is formed.
  • the lights radiate from the backlight module installed behind the glass substrate, the pixels of the LCD display manifest various degrees of brightness and an image is thereby displayed.
  • the applied voltages can reach their target values instantaneously.
  • the liquid crystal molecules require a period of time to develop the targeted orientations.
  • the change of brightness of pixels therefore lags behind the change of voltages, causing a so-called delay phenomenon.
  • the applied voltage reaches its targeted value (referred to as targeted code in Figure 1) almost instantaneously but the brightness of the pixel follows the smooth dotted curve. This delay phenomenon seriously affects the display quality of fast changing, dynamic images on a LCD display.
  • an overdrive method is applied whose device structure is shown in Figure 2.
  • the device contains series-connected transistor and capacitors to form a controller in controlling the voltage level applied on the liquid crystal molecule. Then a higher voltage is applied so that the liquid crystal molecule can reach its targeted optical response faster.
  • the LCD therefore has a faster response time so that the requirement for displaying fast changing, dynamic images can be fulfilled.
  • Figure 3(a) is a characteristic graph showing the optical response of a LCD pixel (near the intersection of the gate line G1 and the data line D1 as shown in Figure 2) driven by the overdrive device according to a prior art.
  • the unit of the voltage in the following description is referred to as code.
  • a code could be a ⁇ V (10 -6 V) or other similar voltage unit.
  • the targeted driving voltage applied to the LCD pixel is code 128, the optical response of the LCD pixel is depicted as the dotted curve (a).
  • conventional overdrive methods use a "coaxing" approach.
  • Figure 3(b) is a waveform diagram showing the pulse waveform of the control voltage asserted by the overdrive device according to a prior art on the gate line G1 (shown in Figure2).
  • Figure 3(c) is a waveform diagram showing the pulse waveform of the driving voltage asserted by the overdrive device according to a prior art on the data line D1 (shown in Figure 2).
  • the corresponding driving voltage is applied on the LCD pixel.
  • a higher driving voltage code 200 is applied first so that the optical response of the pixel follows an acuter dotted curve (b) to reach the targeted brightness faster than the dotted curve (a).
  • the driving voltage is adjusted to code 128 so that the pixel maintains its targeted brightness.
  • the period of the control voltage is the same as the frame time. For example, if the frame rate of the LCD display is 60 Hz, the frame time and the control voltage period are both 16.7ms. In other words, the application of the next control voltage pulse and therefore the next driving voltage can only be applied in the next frame time. The optical response time of the LCD pixel therefore cannot be shortened to be within a single frame time. This is the major limitation of the overdrive method according to a prior art.
  • the present invention is aimed at overcoming the limitations and disadvantages of the LCD overdriving methods according to prior arts.
  • the present invention provides a method and device for overdriving a LCD display to effectively achieve faster optical response time so that fast changing; dynamic images can be displayed with superior quality.
  • the basic pixel structure of the overdrive device contains a first gate line, a second gate line, a first data line, a second data line, a first capacitor, a second capacitor, an output line, a first transistor, and a second transistor.
  • the first transistor has its gate connected to the first gate line, its source connected to the first data line, and its drain connected to the output line, the first capacitor, and the second transistor's drain.
  • the second transistor has its gate connected to the second gate line, its source connected to the second data line, and its drain connected to the output line, the second capacitor, and the first transistor's drain.
  • the first and second capacitors are also connected to the ground.
  • the output line delivers the driving voltage to the corresponding pixel of the LCD display.
  • the first and second gate lines are connected to a gate driver.
  • the first and second data lines are connected to a data driver.
  • the present invention also provides a method for overdriving a liquid crystal display.
  • Figure 1 is a characteristic graph showing the optical response of an LCD pixel under the application of a driving voltage.
  • Figure 2 is a schematic diagram showing the conventional overdrive device according to a prior art.
  • Figure 3(a) is a characteristic graph showing the optical response of an LCD pixel driven by the overdrive device according to a prior art.
  • Figure 3(b) is a waveform diagram showing the pulse waveform of the control voltage asserted by the overdrive device according to a prior art.
  • Figure 3(c) is a waveform diagram showing the pulse waveform of the driving voltage asserted by the overdrive device according to a prior art.
  • Figures 4(a) and 4(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the first embodiment of the present invention.
  • Figures 5(a) through 5(e) shows the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and G1', the driving voltages applied on the first and second data lines D1 and D1' of Figures 4(a) and 4(b) respectively.
  • Figures 6(a) and 6(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the second embodiment of the present invention.
  • Figures 7(a) through 7(g) shows the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and G1', the driving voltages applied on the fourth, third, first and second data lines D, D', D1 and D1' of Figures 6(a) and 6(b) respectively.
  • Figures 8(a) and 8(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the third embodiment of the present invention.
  • Figures 9(a) through 9(d) shows the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and Gm, the driving voltages applied on the first data line D1 of Figures 8(a) and 8(b) respectively.
  • Figures 10(a) and 10(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the fourth embodiment of the present invention.
  • Figures 11(a) through 11(e) shows the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first, second, and third gate lines G1, Gm+1, and G2m+1, the driving voltages applied on the first data line D1 of Figures 10(a) and 10(b) respectively.
  • Figures 12(a) through 12(e) shows the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first, second, and third gate lines G1, Gm+1, and G2m+1, the driving voltages applied on the first data line D1 of Figures 10(a) and 10(b) respectively.
  • Waveform diagrams are mainly used in the following to describe the driving voltage applied on liquid crystal and the corresponding trajectory and behavior of optical response of liquid crystal. Through these waveform diagrams, the features and advantages of the present invention are thereby manifested.
  • the horizontal axis is the time measured in milli-second (ms) and the vertical axis is the voltage measured in a unit referred to as code.
  • ms milli-second
  • code the voltage measured in a unit referred to as code.
  • a single horizontal time axis is plotted beneath Figure 3(c) and, to facilitate the explanation of the present invention, the horizontal time axis is partitioned into periods, each represents the time required to shows the frame N-1, N, and N+1 respectively on the LCD display.
  • the waveform in Figure 3(b) shows the control voltage pulses asserted on the gate line G1 (shown in Figure2).
  • the waveform of Figure 3(c) shows the driving voltage pulses asserted on the data line D1 (shown in Figure2).
  • Figure 3(a) shows output voltage waveform to the pixel near the intersection of the gate line G1 and the data line D1, generated from the two voltages depicted in Figures 3(b) and 3(c).
  • the curves (a) and (b) show the characteristic curve of optical response of the liquid crystal molecules under different driving voltages respectively.
  • the optical response refers to the luminance presented by the liquid crystal measured in units of nits (cd/m 2 ).
  • Figures 4(a) and 4(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the first embodiment of the present invention.
  • the pixel structure of the overdrive device comprises a firs gate line G1, a second gate line G1', a first data line D1, a second data line D1', a first capacitor Cs connected to the ground as a storage capacitor, a second capacitor C LC also connected to the ground representing the equivalent capacitance of liquid crystal, an output line (not shown in Figure 4(b)) for delivering the output overdrive voltage (V LC ) to the a corresponding pixel on the LCD display, a first transistor Q having its gate connected to the first gate line G1, its source connected to the first data line D1, and its drain connected to the output line, the first capacitor Cs and the drain of the second transistor Q', a second transistor Q' having its gate connected to the second gate line G1', its source connected to the second data line D1', and its drain connected to the drain of the first transistor Q, the second capacitor C LC , and the output line.
  • the first and second gate line G1' the first data line D1, a second data line D1'
  • Figures 5(a) through 5(e) show the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and G1', the driving voltages applied on the first and second data lines D1 and D1' of Figures 4(a) and 4(b) respectively.
  • the control voltage pulses on the first and second gate lines G1 and G1' have a time difference for scanning (or displaying) n lines of pixels of the LCD display.
  • the time difference between the two control voltages is adjustable according to the present invention.
  • the driving method of the overdrive device according to the first embodiment of the present invention comprises the following steps:
  • the driving voltage D1' and the output overdrive voltage V LC are at a negative V0' (code 32). Then after the instant A1 and during frame N, the driving voltage D1 jumps instantaneously to a positive V1 (code 200). Due to the control voltage G1's trigger at the instant A1, the output overdrive voltage V LC jumps to the positive V1 (code 200) and remains at V1 until the instant A2. At the instant A2, the driving voltage D1' is at a positive V2 (code 120). Due to the trigger of the control voltage G1' at the instant A2, the output overdrive voltage V LC drops from the positive V1 (code 200) to the positive V2 (code 120) and remains at V2 until the instant A3.
  • Frame N+1 starts from the instant A3.
  • the driving voltage D1 drops instantaneously to a negative V2' (code 120). Due to the control voltage G1's trigger at the instant A3, the output overdrive voltage V LC drops instantaneously to the negative V2' (code 120) and remains at V2' until the instant A4. At the instant A4, the driving voltage D1' is still at the negative V2' (code 120). Due to the trigger of the control voltage G1' at the instant A4, the output overdrive voltage V LC is maintained at the negative V2' (code 120) until the instant A5. Frame N+2 starts from the instant A5. At this point of time, the driving voltage D1 jumps instantaneously to a positive V2 (code 120).
  • the curve (c) is the liquid crystal optical response trajectory when no overdrive is applied.
  • the curve (b) is the liquid crystal optical response trajectory under overdrive and the frame time is 16ms.
  • the curve (a) is the liquid crystal optical response trajectory under overdrive and the frame time is 5ms.
  • n pulses represents n pulses.
  • the control voltage pulses of the control voltages G1 and G1' have a time difference of triggering the display of n lines of pixels. More specifically, after the overdrive device applies the control voltage G1 on a first line of pixel, the overdrive device will then apply similar control voltages to a second, third, until a n th line of pixels. Then the overdrive device returns to the first line of pixel and applies the control voltage G1'.
  • This time interval represented by the number n can be adjusted by the designer of the LCD display based on the actual requirement of the display and the material characteristics of the liquid crystal. This technique can also be applied to scanning black lines to achieve an effect similar to the impulse type display such as CRT. This is the most significant feature of the present invention that makes the present invention far superior than the prior arts.
  • Figures 6(a) and 6(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the second embodiment of the present invention.
  • the pixel structure of the overdrive device comprises a firs gate line G1, a second gate line G1', a first data line D1, a second data line D1', a first capacitor Cs connected to the ground as a storage capacitor, a second capacitor C LC also connected to the ground representing the equivalent capacitance of liquid crystal, an output line (not shown in Figure 6(b)) for delivering the output overdrive voltage (V LC ) to a corresponding pixel on the LCD display, a first transistor Q having its gate connected to the first gate line G1, its source connected to the first data line D1, and its drain connected to the output line, the first capacitor Cs and the drain of the second transistor Q', a second transistor Q' having its gate connected to the second gate line G1', its source connected to the second data line D1', and its drain connected to the drain of the first transistor Q, the second capacitor C LC , and the output line.
  • the first and second gate lines G1 and G1' are connected to a gate driver and the first and second data lines D1 and D1' are connected to the drains of a fourth and third transistor Q4 and Q3 respectively.
  • the fourth and third transistor Q3 and Q4 have their sources parallel connected to a data driver via a fifth data line DS and their gates connected to a third and fourth data lines D' and D respectively.
  • Figures 7(a) through 7(g) show the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and G1', the driving voltages applied on the fourth, third, first and second data lines D, D', D1 and D1' of Figures 6(a) and 6(b) respectively.
  • the control voltage pulses on the first and second gate lines G1 and G1' have a time difference for scanning (or displaying) n lines of pixels of the LCD display.
  • the time difference between the two control voltages is adjustable according to the present invention.
  • the driving method of the overdrive device according to the second embodiment of the present invention comprises the following steps:
  • the driving voltage D1' and the output overdrive voltage V LC are at a negative V0' (code 32). Then after the instant A1 and during frame N, the driving voltage D1 jumps instantaneously to a positive V1 (code 200). Due to the control voltage G1's trigger at the instant A1, the output overdrive voltage V LC jumps to the positive V1 (code 200) and remains at V1 until the instant A2. At the instant A2, the driving voltage D1' is at a positive V2 (code 120). Due to the trigger of the control voltage G1' at the instant A2, the output overdrive voltage V LC drops from the positive V1 (code 200) to the positive V2 (code 120) and remains at V2 until the instant A3.
  • Frame N+1 starts from the instant A3.
  • the driving voltage D1 drops instantaneously to a negative V2' (code 120). Due to the control voltage G1's trigger at the instant A3, the output overdrive voltage V LC drops instantaneously to the negative V2' (code 120) and remains at V2' until the instant A4. At the instant A4, the driving voltage D1' is still at the negative V2' (code 120). Due to the trigger of the control voltage G1' at the instant A4, the output overdrive voltage V LC is maintained at the negative V2' (code 120) until the instant A5. Frame N+2 starts from the instant A5. At this point of time, the driving voltage D1 jumps instantaneously to a positive V2 (code 120).
  • the curve (c) is the liquid crystal optical response trajectory when no overdrive is applied.
  • the curve (b) is the liquid crystal optical response trajectory under overdrive and the frame time is 16ms.
  • the curve (a) is the liquid crystal optical response trajectory under overdrive and the frame time is 5ms.
  • n pulses represents n pulses.
  • the control voltage pulses of the control voltages G1 and G1' have a time difference of triggering the display of n lines of pixels. More specifically, after the overdrive device applies the control voltage G1 on a first line of pixel, the overdrive device will then apply similar control voltages to a second, third, until a n th line of pixels. Then the overdrive device returns to the first line of pixel and applies the control voltage G1'.
  • This time interval represented by the number n can be adjusted by the designer of the LCD display based on the actual requirement of the display and the material characteristics of the liquid crystal. This is the most significant feature of the present invention that makes the present invention far superior than the prior arts.
  • the output overdrive voltage V LC generated by the overdrive device according the second embodiment of the present invention is the same as the one generated by the first embodiment of the present invention. This is intended to simply the explanation and comparison of the embodiments of the present invention. The designer, however, can actually, based on the principle of the present invention, to generate the output overdrive voltage V LC having a specific waveform to suit the designer's requirement.
  • Figures 8(a) and 8(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the third embodiment of the present invention.
  • the pixel structure of the overdrive device comprises a firs gate line G1, a first data line D1, a first capacitor Cs connected to the ground as a storage capacitor, a second capacitor C LC also connected to the ground representing the equivalent capacitance of liquid crystal, an output line (not shown in Figure 8(b)) for delivering the output overdrive voltage (V LC ) to a corresponding pixel on the LCD display, a first transistor Q1 having its gate connected to the first gate line G1, its source connected to the first data line D1, and its drain connected to the output line, the first capacitor Cs, and the second capacitor C LC .
  • FIG. 8(a) and 8(b) another pixel at the intersection of the date line D1 and a second gate line Gm has an identical structure containing a second transistor Qm (not shown in Figures 8(a) and 8(b)).
  • the first gate line G1 is connected to a gate driver and the first data line D1 is connected to a data driver.
  • Each of the gate drivers has two input lines, the Output Enable (OE) and Start Pulse Horizontal (STH) lines.
  • the OE and STH input lines control the gate drivers so that control voltages are asserted on two lines of pixels via two gate lines (such as the first gate line G1 and a second gate line Gm) simultaneously at one time.
  • the two lines of pixels that are m lines of pixels apart therefore display two lines of an image simultaneously on the LCD display.
  • Figures 9(a) through 9(d) show the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first and second gate lines G1 and Gm, the driving voltage applied on the first data line D1 of Figures 8(a) and 8(b) respectively.
  • the driving method of the overdrive device according to the third embodiment of the present invention comprises the following steps:
  • the driving voltage D1 and the output overdrive voltage V LC are at a negative V0' (code 32). Then after the instant A1 and during frame N, the driving voltage D1 jumps instantaneously to a positive V1 (code 200). Due to the control voltage G1's trigger at the instant A1, the output overdrive voltage V LC jumps to the positive V1 (code 200) and remains at V1 until the instant A2. At the instant A2, the driving voltage D1 is at a positive V2 (code 120). Due to the trigger of the control voltage G1 at the instant A2, the output overdrive voltage V LC drops from the positive V1 (code 200) to the positive V2 (code 120) and remains at V2 until the instant A3.
  • Frame N+1 starts from the instant A3.
  • the driving voltage D1 drops instantaneously to a negative V2' (code 120). Due to the control voltage G1's trigger at the instant A3, the output overdrive voltage V LC drops instantaneously to the negative V2' (code 120) and remains at V2' until the instant A4. At the instant A4, the driving voltage D1' is still at the negative V2' (code 120). Due to the trigger of the control voltage G1' at the instant A4, the output overdrive voltage V LC is maintained at the negative V2' (code 120) until the instant A5. Frame N+2 starts from the instant A5. At this point of time, the driving voltage D1 jumps instantaneously to a positive V2 (code 120).
  • the curve (c) is the liquid crystal optical response trajectory when no overdrive is applied.
  • the curve (b) is the liquid crystal optical response trajectory under overdrive and the frame time is 16ms.
  • the curve (a) is the liquid crystal optical response trajectory under overdrive and the frame time is 5ms.
  • the "Hsync" shown in Figure 9(c) means the control voltages G1 and Gm are synchronized. Accordingly, based on the third embodiment of the present invention, the first and second control voltages G1 and Gm are applied synchronously to two gate lines that are m- 1 lines apart on the LCD display. The interaction between the control voltage Gm, the driving voltage D1, and the output overdrive voltage V LC are exactly the same as that between the control voltage G1, the driving voltage D1, and the output overdrive voltage V LC (as depicted from Figure 9(a) to Figure 9(d)). Further description is therefore omitted.
  • the output overdrive voltage V LC generated by the overdrive device according the third embodiment of the present invention is the same as the one generated by the first embodiment of the present invention. This is intended to simply the explanation and comparison of the embodiments of the present invention. The designer, however, can actually, based on the principle of the present invention, to generate the output overdrive voltage V LC having a specific waveform to suit the designer's requirement.
  • the output overdrive voltage V LC can achieve the objective and effect of overdriving liquid crystal whether the output overdrive voltage V LC have either a positive or negative polarity.
  • the fourth embodiment of the present invention is described in the following along with Figures 10(a) and 10(b) and Figures 11(a) to 11(e).
  • the fifth embodiment of the present invention also adopts the identical overdrive device as depicted in Figures 10(a) and 10(b).
  • a different driving method is applied in the fifth embodiment of the present invention to achieve a different display effect. More details will be given later.
  • Figures 10(a) and 10(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the fourth embodiment of the present invention.
  • the pixel structure of the overdrive device comprises a firs gate line G1, a first data line D1, a first capacitor Cs connected to the ground as a storage capacitor, a second capacitor C LC also connected to the ground representing the equivalent capacitance of liquid crystal, an output line (not shown in Figure 10(b)) for delivering the output overdrive voltage (V LC ) to a corresponding pixel on the LCD display, a first transistor Q1 having its gate connected to the first gate line G1, its source connected to the first data line D1, and its drain connected to the output line, the first capacitor Cs, and the second capacitor C LC .
  • the first gate line G1 is connected to a gate driver and the first data line D1 is connected to a data driver.
  • Each of the gate drivers has two input lines, the Output Enable (OE) and Start Pulse Horizontal (STH) lines.
  • the OE and STH input lines control the gate drivers so that two of the three gate drivers GD1, GD2, and GD3 are enabled simultaneously at a time and the two enabled gate drivers alternate in pairs such as GD1 and GD3 together, and then GD1 and GD2 together, and then GD2 and GD3 together, all within a single frame time. Then at the next frame time, the gate drivers GD1 and GD3 are enabled together again. The pattern will repeat like this continuously.
  • Each gate driver controls up to m gate lines.
  • the gate drivers GD1 and GD3 apply control voltages on the gate lines G1 and G2m+1 synchronously, and then on the gate lines G2 and G2m+2, until on the gate lines Gm and G3m.
  • gate drivers GD1 and GD2 are enabled.
  • the gate driver GD1 and GD2 apply control voltages on the gate lines G1 and Gm+1 synchronously, and then on the gate lines G2 and Gm+2, until on the gate lines Gm and G2m.
  • the pattern repeats like this continuously.
  • the transistor of each pixel that has its gate connected to the gate line is triggered so that the driving voltages of these pixels apply to the pixels via their output lines and a line of the image is thereby displayed.
  • two lines of the image are displayed simultaneously on the LCD display.
  • Figures 11(a) through 11(e) show the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first, second, and third gate lines G1, Gm+1, and G2m+1, the driving voltage applied on the first data line D1 of Figures 10(a) and 10(b) respectively.
  • the driving method of the overdrive device according to the fourth embodiment of the present invention comprises the following steps:
  • the driving voltage D1 and the output overdrive voltage V LC are at a negative V0' (code 32). Then after the instant A1 and during frame N, the driving voltage D1 jumps instantaneously to a positive V1 (code 200). Due to the control voltage G1's trigger at the instant A1, the output overdrive voltage V LC jumps to the positive V1 (code 200) and remains at V1 until the instant A2. At the instant A2, the driving voltage D1 is at a positive V2 (code 120). Due to the trigger of the control voltage G1 at the instant A2, the output overdrive voltage V LC drops from the positive V1 (code 200) to the positive V2 (code 120) and remains at V2 until the instant A3.
  • Frame N+1 starts from the instant A3.
  • the driving voltage D1 drops instantaneously to a negative V2' (code 120). Due to the control voltage G1's trigger at the instant A3, the output overdrive voltage V LC drops instantaneously to the negative V2' (code 120) and remains at V2' until the instant A4. At the instant A4, the driving voltage D1' is still at the negative V2' (code 120). Due to the trigger of the control voltage G1' at the instant A4, the output overdrive voltage V LC is maintained at the negative V2' (code 120) until the instant A5. Frame N+2 starts from the instant A5. At this point of time, the driving voltage D1 jumps instantaneously to a positive V2 (code 120).
  • the curve (c) is the liquid crystal optical response trajectory when no overdrive is applied.
  • the curve (b) is the liquid crystal optical response trajectory under overdrive and the frame time is 16ms.
  • the curve (a) is the liquid crystal optical response trajectory under overdrive and the frame time is 5ms.
  • the objective of the fourth embodiment of the present invention is that two lines of pixels that are 2 m lines apart are displayed simultaneously and synchronously on the LCD display as shown in Figures 11(b) through 11(d).
  • control voltages Gm+1 and G2m+1, the driving voltage D1, and the output overdrive voltage V LC are exactly the same as that between the control voltage G1, the driving voltage D1, and the output overdrive voltage V LC (as depicted in Figures 11(a), 11(b), and 11(e)). Further description is therefore omitted.
  • the output overdrive voltage V LC generated by the overdrive device according the fourth embodiment of the present invention is the same as the one generated by the first embodiment of the present invention. This is intended to simply the explanation and comparison of the embodiments of the present invention. The designer, however, can actually, based on the principle of the present invention, to generate the output overdrive voltage V LC having a specific waveform to suit the designer's requirement.
  • the fifth embodiment of the present invention is described in the following along with Figures 10(a) and 10(b) and Figures 12(a) to 12(e).
  • the fifth embodiment of the present invention adopts the identical overdrive device as the fourth embodiment of the present invention as depicted in Figures 10(a) and 10(b).
  • a different driving method is applied in the fifth embodiment of the present invention to achieve a different display effect.
  • Figures 10(a) and 10(b) are schematic diagrams showing the overdrive device and an inner structure of a pixel at the intersection of a plurality of gate lines and data lines according to the fourth embodiment of the present invention.
  • the pixel structure of the overdrive device comprises a firs gate line G1, a first data line D1, a first capacitor Cs connected to the ground as a storage capacitor, a second capacitor C LC also connected to the ground representing the equivalent capacitance of liquid crystal, an output line (not shown in Figure 10(b)) for delivering the output overdrive voltage (V LC ) to a corresponding pixel on the LCD display, a first transistor Q1 having its gate connected to the first gate line G1, its source connected to the first data line D1, and its drain connected to the output line, the first capacitor Cs, and the second capacitor C LC .
  • the first gate line G1 is connected to a gate driver and the first data line D1 is connected to a data driver.
  • Each of the gate drivers has two input lines, the Output Enable (OE) and Start Pulse Horizontal (STH) lines.
  • the OE and STH input lines control the gate drivers so that the three gate drivers GD1, GD2, and GD3 are enabled simultaneously at a time.
  • Each gate driver controls up to m gate lines.
  • the gate drivers GD1, GS2, and GD3 When gate drivers GD1, GD2, and GD3 are enabled, the gate drivers GD1, GS2, and GD3 apply control voltages on the gate lines G1, Gm+1, and G2m+1 synchronously, and then on the gate lines G2, Gm+2, and G2m+2, until on the gate lines Gm, G2m, and G3m.
  • the pulse of the control voltage is applied on a gate line, the transistor of each pixel that has its gate connected to the gate line is triggered so that the driving voltages of these pixels apply to the pixels via their output lines and a line of the image is thereby displayed.
  • three lines of the image that are m lines apart are displayed simultaneously on the LCD display.
  • Figures 12(a) through 12(e) show the various waveforms of the output overdrive voltage V LC , the control voltages asserted on the first, second, and third gate lines G1, Gm+1, and G2m+1, the driving voltage applied on the first data line D1 of Figures 10(a) and 10(b) respectively.
  • the driving method of the overdrive device according to the fifth embodiment of the present invention comprises the following steps:
  • alternating current (AC) voltage is used to drive the overdrive device
  • the driving voltage generated by the overdrive device as shown in Figures 12(e) and the output overdrive voltage V LC alternate between positive and negative phases with respect to the reference voltage Vcom.
  • the driving voltage D1 and the output overdrive voltage V LC are at a negative V0' (code 32). Then after the instant A1 and during frame N, the driving voltage D1 jumps instantaneously to a positive V1 (code 200). Due to the control voltage G1's trigger at the instant A1, the output overdrive voltage V LC jumps to the positive V1 (code 200) and remains at V1 until the instant A2. At the instant A2, the driving voltage D1 is at a positive V2 (code 120). Due to the trigger of the control voltage G1 at the instant A2, the output overdrive voltage V LC drops from the positive V1 (code 200) to the positive V2 (code 120) and remains at V2 until the instant A3.
  • Frame N+1 starts from the instant A3.
  • the driving voltage D1 drops instantaneously to a negative V2' (code 120). Due to the control voltage G1's trigger at the instant A3, the output overdrive voltage V LC drops instantaneously to the negative V2' (code 120) and remains at V2' until the instant A4. At the instant A4, the driving voltage D1' is still at the negative V2' (code 120). Due to the trigger of the control voltage G1' at the instant A4, the output overdrive voltage V LC is maintained at the negative V2' (code 120) until the instant A5. Frame N+2 starts from the instant A5. At this point of time, the driving voltage D1 jumps instantaneously to a positive V2 (code 120).
  • the curve (c) is the liquid crystal optical response trajectory when no overdrive is applied.
  • the curve (b) is the liquid crystal optical response trajectory under overdrive and the frame time is 16ms.
  • the curve (a) is the liquid crystal optical response trajectory under overdrive and the frame time is 5ms.
  • the objective of the fifth embodiment of the present invention is that three lines of pixels that are m lines apart are displayed simultaneously and synchronously on the LCD display as shown in Figures 12(b) through 12(d).
  • control voltages Gm+1 and G2m+1, the driving voltage D1, and the output overdrive voltage V LC are exactly the same as that between the control voltage G1, the driving voltage D1, and the output overdrive voltage V LC (as depicted in Figures 12(a), 12(b), and 12(e)). Further description is therefore omitted.
  • each line of image will be displayed three times in a single frame time.
  • Each line of the image will be displayed with two other lines that are m lines apart simultaneously.
  • the output overdrive voltage V LC generated by the overdrive device according the fifth embodiment of the present invention is the same as the one generated by the first embodiment of the present invention. This is intended to simply the explanation and comparison of the embodiments of the present invention. The designer, however, can actually, based on the principle of the present invention, to generate the output overdrive voltage V LC having a specific waveform to suit the designer's requirement.
  • the present invention indeed offers design and manufacturing flexibility.
  • the time interval n between the first and second control voltages G1 and G1' of the first and second embodiments is adjustable.
  • the distance m between the synchronously displayed image lines of the fourth and fifth embodiments is also adjustable.
  • the method and device for overdriving the LCD display provided by the present invention can indeed improve and overcome the limitations and disadvantages of prior arts.
  • the LCD displays employing the present invention therefore have faster optical response time and superior dynamic image display quality.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007020684A1 (de) * 2007-05-03 2008-11-13 Vastview Technology Inc. Verfahren zum Ansteuern eines Flüssigkristalldisplays mit Mehrfachbildpolaritätsumkehr
CN102044228A (zh) * 2009-10-14 2011-05-04 奇美电子股份有限公司 主动矩阵式液晶显示装置及相关驱动方法
WO2013185425A1 (fr) * 2012-06-13 2013-12-19 京东方科技集团有限公司 Structure de pixels, dispositif d'affichage et procédé de saturation
CN106601187A (zh) * 2017-02-22 2017-04-26 北京集创北方科技股份有限公司 显示控制装置、控制卡、显示装置及其控制方法

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Publication number Priority date Publication date Assignee Title
US5920300A (en) * 1994-10-27 1999-07-06 Semiconductor Energy Laboratory Co., Ltd. Active matrix liquid crystal display device
US20010003448A1 (en) * 1999-12-10 2001-06-14 Takashi Nose Driving process for liquid crystal display
US20030095117A1 (en) * 2001-11-22 2003-05-22 Fujitsu Limited Matrix display device and method of driving matrix display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5920300A (en) * 1994-10-27 1999-07-06 Semiconductor Energy Laboratory Co., Ltd. Active matrix liquid crystal display device
US20010003448A1 (en) * 1999-12-10 2001-06-14 Takashi Nose Driving process for liquid crystal display
US20030095117A1 (en) * 2001-11-22 2003-05-22 Fujitsu Limited Matrix display device and method of driving matrix display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007020684A1 (de) * 2007-05-03 2008-11-13 Vastview Technology Inc. Verfahren zum Ansteuern eines Flüssigkristalldisplays mit Mehrfachbildpolaritätsumkehr
CN102044228A (zh) * 2009-10-14 2011-05-04 奇美电子股份有限公司 主动矩阵式液晶显示装置及相关驱动方法
TWI426494B (zh) * 2009-10-14 2014-02-11 Innolux Corp 主動矩陣式液晶顯示裝置及相關驅動方法
WO2013185425A1 (fr) * 2012-06-13 2013-12-19 京东方科技集团有限公司 Structure de pixels, dispositif d'affichage et procédé de saturation
CN106601187A (zh) * 2017-02-22 2017-04-26 北京集创北方科技股份有限公司 显示控制装置、控制卡、显示装置及其控制方法

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