EP1603107A1 - Procédé de commande d'un dispositif d'affichage à cristaux liquides - Google Patents

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

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Publication number
EP1603107A1
EP1603107A1 EP04013038A EP04013038A EP1603107A1 EP 1603107 A1 EP1603107 A1 EP 1603107A1 EP 04013038 A EP04013038 A EP 04013038A EP 04013038 A EP04013038 A EP 04013038A EP 1603107 A1 EP1603107 A1 EP 1603107A1
Authority
EP
European Patent Office
Prior art keywords
gate
data
line
driver
drivers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04013038A
Other languages
German (de)
English (en)
Inventor
Yu-Ren Shen
Cheng-Jung Chen
Liang-Chen Chien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VastView Technology Inc
Original Assignee
VastView Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VastView Technology Inc filed Critical VastView Technology Inc
Priority to EP04013038A priority Critical patent/EP1603107A1/fr
Publication of EP1603107A1 publication Critical patent/EP1603107A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G09G3/3666—Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
    • 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
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G09G2310/062—Waveforms for resetting a plurality of scan lines at a time
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across 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
    • 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
    • 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 relates to a method of driving a liquid crystal display (LCD) device, and more particularly, to a method of controlling a driver circuit of an LCD device to achieve superior grey-scale response time.
  • LCD liquid crystal display
  • an LCD device has an inherent limitation on its grey-scale response time due to some characteristics of the LCD device.
  • a user When used as a display for a personal computer, a user cannot perceive a significant difference between an LCD device and a CRT device.
  • the limitation of an LCD device on the grey-scale response time becomes profound as television programs contains almost all moving images. In other words traditional LCD televisions have a significantly inferior display effect compared to CRT televisions.
  • an LCD device contains a plurality of pixels driven by a driver circuit of the LCD device.
  • the driver circuit contains a plurality of data drivers and gate drivers.
  • the data drivers are connected to data lines and the gate drivers are connected to gate lines of the LCD device.
  • An overlapping area between a data line and a gate line then defines a pixel of the LCD device.
  • Figures 1A and 1B are waveform diagrams showing various control and data signals seen in traditional LCD devices. When a vertical synchronization signal appears, a brand new screen would be displayed on an LCD device line by line in a raster scan pattern. Each scan line has n pixels.
  • Figure 1A shows waveforms of data and control signals for input a scan line's data into data drivers according to a prior art. As shown in Figure 1A, when a STH signal becomes active, data for a first scan line's n pixels is input sequentially one pixel a time into data drivers controlled by a horizontal clock signal.
  • a data for a first pixel is shifted into a data driver, then on a second rising edge, a data for a second pixel is shifted, and following this pattern, data for the n pixels is input into the data drivers.
  • the data for a pixel includes digital data for the pixel's R, G, and B colors.
  • the data drivers convert the R, G, and B digital data of all pixels on the first scan line into corresponding driving voltages and apply the voltages on data lines.
  • Figure 1B shows waveforms of data and control signal for displaying a plurality of scan lines on an LCD device according to a prior art.
  • a gate driver on a first rising edge of a vertical clock signal, a gate driver will "turn on" a first gate line by asserting a gate driving signal on the first gate line, which in turn allows the driving voltages on the data lines to be applied to all pixels of the first scan line of the LCD device.
  • the first scan line of the LCD device is thereby displayed. Subsequent scan lines will follow a same pattern to be displayed sequentially on the LCD device.
  • PID Pseudo Impulse Drive
  • a picture image is composed by sequentially displaying frames 1, 2, 3, 4, 5, 6, and 7.
  • frames 2, 4, and 6 have corresponding backlight sources 22, 24, and 26 all at turn-off state.
  • frames 1, 3, 5, and 7 at their time of display have corresponding backlight sources 21, 23, 25, and 27 all at light-emitting state.
  • the second PID method utilizes a flashing mode to achieve a simulation of the impulse drive by alternating light-emitting and turn-off backlight sources
  • a picture image is composed by sequentially displaying frames 1, 2, 3, and 4.
  • a third PID method all black data frames 11, 12, 13 are interposed between frames 1 and 2, frames 2 and 3, and frames 3 and 4, respectively.
  • frames 11, 12, and 13 have corresponding backlight sources 22, 24, and 26 all at turn-off state
  • frames 1, 2, 3, and 4 at their time of display have corresponding backlight sources 21, 23, 25, and 27 all at light-emitting state.
  • the third PID method combines the foregoing two methods to achieve a simulation of the impulse drive.
  • a major objective of the present invention is to provide a method of driving an LCD device so as to achieve superior grey-scale response time for the LCD device.
  • the method of the present invention controls a driver circuit of the LCD that contains a plurality of data drivers and at least two gate drivers.
  • a first gate driver is selected from the at least two gate drivers based on a selection rule.
  • the first gate driver displays a part of a picture image by sequentially displaying the image line by line up to a number of lines according to a pre-determined display range.
  • a second gate driver based on the selection rule displays a part of an all black image by displaying, from a line B, a number of lines based on a pre-determined display range simultaneously.
  • the line B is separated from the line A by a number of lines according to a pre-determined gap range.
  • the driving voltages have to be of a specific target value.
  • Figures 1A and 1B are waveform diagrams showing various control and data signals seen in traditional LCD devices.
  • FIGS 2A-2C are schematic diagrams for methods simulating impulse drive according to prior arts.
  • Figure 3 is a schematic diagram showing a driver circuit of an LCD device controlled by the present invention.
  • Figures 4A-4C are schematic diagrams showing a scan line display sequence of the present invention whose pre-determined display range is 1.
  • Figure 5 is a waveform diagram showing various data and control signals according the present invention whose pre-determined display range is 1.
  • Figure 7 is a waveform diagram showing various data and control signals according the present invention whose pre-determined display range is 2.
  • Figure 8 is a schematic diagram showing an inner structure of a data driver with a reset or preset signal line.
  • Figure 9 is a schematic diagram showing an inner structure of a data driver and a plurality of switches.
  • FIG 3 is a schematic diagram showing a driver circuit of an LCD device controlled by the present invention.
  • the driver circuit contains a plurality of data drivers 30 and two gate drivers 32 and 33.
  • the data drivers and gate drivers jointly drive an LCD panel 34. If the LCD panel has a resolution 640x480, the total number of pixels of the LCD panel 34 is 307,200.
  • a total number of data lines connected to the data drivers is 640 and a total number of gate lines connected to the gate drivers is 480.
  • the gate drivers 32 and 33 have two OE signals, OE 1 and OE 2, applied to them respectively. Please note that the two OE signals are not the same as an OE signal used in a driver circuit according to a prior art that is always at an ON(1) state (as shown in Figure 1B).
  • the method of the present invention selects a first gate driver and a second gate driver based on a selection rule. Then by controlling the first and second gate drivers, the present invention turns on the gate lines in a sequence that is different from that of a prior art so as to achieve a faster grey-scale response time.
  • the present invention applies the OE 1 and OE 2 signals on the gate drivers to turn on the gate lines in a different sequence, and how the first and second gate drivers are determined will be described.
  • the first gate driver displays a part of a picture image by sequentially displaying the image line by line starting from a line A up to a number of lines according to a pre-determined display range. Then the second gate driver displays a part of an all black image by displaying, from a line B, a number of lines based on a pre-determined display range simultaneously.
  • the line B is separated from the line A by a number of lines according to a pre-determined gap range.
  • a selection rule of the present invention is as follows.
  • a gate driver activated to display that part of image is referred to as the first gate driver.
  • a gate driver activated to display that part of the all black image is referred to as the second gate driver.
  • Figures 4A-4C are schematic diagrams showing a scan line display sequence of the present invention.
  • the pre-determined display rage is 1.
  • Line A is the first line.
  • the pre-determined gap range is 240.
  • the data drivers assert driving voltages corresponding to a line of a picture image 40.
  • the gate driver 32 is the first gate driver and starting from the first gate line the gate driver 32 displays up to one line of the image 40.
  • the gate driver 33 is the second gate driver and starting from the 241 st gate line the gate driver 33 displays up to one line of an all black image 42.
  • the first and second gate drivers alternate their operations as described above.
  • the second gate driver turns on the 251 st gate line so that the 251 st scan line of the black image is displayed.
  • the gate driver 32 reaches the very last gate line connected, i.e. the 240 th gate line, and when the 241 st scan line of the picture image is to be display, as the corresponding gate line is connected to the gate driver 33, the gate driver now becomes the first gate driver. And based on the selection rule, the gate driver 32 now becomes the second gate driver.
  • the first gate driver (now the gate driver 33) turns on the display of the 241 st line of the picture image.
  • the second gate driver (now the gate driver 32) turns on the display of the 1 st line of the all black image, as the 1 st scan line is 240 lines away from the 241 st scan line.
  • the 241 st scan line of the LCD panel 34 displays a line of the all black image earlier as shown in Figure 4A.
  • Figure 5 is a waveform diagram showing various data and control signals according the present invention.
  • the pre-determined display range is 1
  • line A is the first line
  • the pre-determined gap range is 240.
  • Driving voltages asserted by the data driver 30 are in the following sequence. First, driving voltages for displaying the 1 st line of image 40 is asserted, then driving voltages for displaying the 241 st line of the all black image 42 is asserted, then driving voltages for displaying the 2 nd line of image 40 is asserted, then driving voltages for displaying the 242 nd line of the all black image 42 is asserted, and so on.
  • OE 1 is at an active state and a gate driving signal is asserted on the 1 st gate line.
  • the 1 st line of image 40 is thereby displayed on the 1 st scan line of the LCD panel 34.
  • OE 2 is at an active state and a gate driving signal is asserted on the 241 st gate line.
  • the 241 st line of the all black image 42 is thereby displayed on the 241 st scan line of the LCD panel 34.
  • Figure 6 is a schematic diagram showing another scan line display sequence of the present invention.
  • the pre-determined display range is 2
  • line A is the first line
  • the pre-determined gap range is 240.
  • the first gate driver turns on the 1 st gate line and then the 2 nd gate line sequentially. Up to two lines of the picture image 40 are thereby displayed on the first two scan lines of the LCD panel 34.
  • the second gate driver then turns on the 241 st and 242 nd gate lines simultaneously so that up to two lines of the all black image are displayed on the 241 st and 242 nd scan lines of the LCD panel 34. Therefore a display sequence of the scan lines is as follows: the 1 st scan line, the 2 nd scan line, and then the 241 st and 242 nd two scan lines together.
  • OE 1 is at an active state and a gate driving signal is asserted on the 1 st gate line.
  • the 1 st line of image 40 is thereby displayed on the 1 st scan line of the LCD panel 34.
  • OE 1 remains at the active state.
  • a gate driving signal is then asserted on the 2 nd gate line.
  • the 2 nd line of image 40 is thereby displayed on the 2 nd scan line of the LCD panel 34.
  • gate driving signals are asserted on the 241 st and 242 nd gate lines simultaneously.
  • the 241 st and 242 nd lines of the all black image 42 are thereby displayed on the 241 st and 242 nd scan lines of the LCD panel 34.
  • a preset signal could be asserted on the preset signal line so that the data registers 82 are filled with the specific data.
  • a reset signal could be asserted on he reset signal line so that the data registers 82 are reset with the specific data. In either ways data drivers 30 are able to output driving voltages with the target value.
  • the reset or preset signal line With the reset or preset signal line, data drivers are not required to input any pixel data in order to output driving voltages with the target value. As shown in Figure 5, a vertical clock period is required to display a line of the all black image. On the other hand, the reset or preset signal line allows data drivers to continue output driving voltages with the target value without spending time to input the specific pixel data and therefore, as shown in Figure 7, a vertical clock period can display a plurality of lines of the all black image and thereby reduces a grey-scale response time of the LCD panel 34. However, as shown in Figure 8, DACs are still required to convert the specific pixel data reset or preset in the data registers 82 into driving voltages with the target value.
  • FIG 9 is a schematic diagram showing an inner structure of a data driver and a plurality of switches.
  • a plurality of switches 90 are placed between DACs 80 and their corresponding data lines.
  • a switch 90 has two inputs. One is from the output of a DAC 80 inside the data driver 30. The other one is a separate signal line carrying a voltage with the target value.
  • the switch 90 can select one of the inputs to be placed on a data line connected to the switch 90. If a data driver outputs driving voltages corresponding to a part of a picture image, the switch 90 allows that driving voltage to be placed on a data line. On the other hand, in order to display a line of the all black image, the switch 90 allows the voltage with the target value on the separate signal line to be placed on a data line. Please note that the switches 90 can be inside or outside the data driver 30.
  • the data drivers 30 in both Figure 8 and 9 can achieve a reduction of a grey-scale response time of an LCD device.
  • An advantage of the data driver 30 as shown in Figure 9 is that a digital-to-analog conversion by the DAC 80 is omitted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP04013038A 2004-06-02 2004-06-02 Procédé de commande d'un dispositif d'affichage à cristaux liquides Withdrawn EP1603107A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04013038A EP1603107A1 (fr) 2004-06-02 2004-06-02 Procédé de commande d'un dispositif d'affichage à cristaux liquides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04013038A EP1603107A1 (fr) 2004-06-02 2004-06-02 Procédé de commande d'un dispositif d'affichage à cristaux liquides

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EP1603107A1 true EP1603107A1 (fr) 2005-12-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284134A1 (fr) * 1987-03-17 1988-09-28 Koninklijke Philips Electronics N.V. Méthode de commande d'un dispositif d'affichage à cristal liquide et dispositif d'affichage associé
US5490000A (en) * 1992-12-07 1996-02-06 Casio Computer Co., Ltd. Deformed helix ferroelectric liquid crystal display device and method of driving
US20010003448A1 (en) * 1999-12-10 2001-06-14 Takashi Nose Driving process for liquid crystal display
US6489941B1 (en) * 1999-03-18 2002-12-03 Alps Electric Co., Ltd. Liquid crystal display apparatus with driving circuit to make full use of TL-AFLC response speed and method for driving the apparatus
US20040001054A1 (en) * 2002-03-20 2004-01-01 Hiroyuki Nitta Display device and driving method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284134A1 (fr) * 1987-03-17 1988-09-28 Koninklijke Philips Electronics N.V. Méthode de commande d'un dispositif d'affichage à cristal liquide et dispositif d'affichage associé
US5490000A (en) * 1992-12-07 1996-02-06 Casio Computer Co., Ltd. Deformed helix ferroelectric liquid crystal display device and method of driving
US6489941B1 (en) * 1999-03-18 2002-12-03 Alps Electric Co., Ltd. Liquid crystal display apparatus with driving circuit to make full use of TL-AFLC response speed and method for driving the apparatus
US20010003448A1 (en) * 1999-12-10 2001-06-14 Takashi Nose Driving process for liquid crystal display
US20040001054A1 (en) * 2002-03-20 2004-01-01 Hiroyuki Nitta Display device and driving method thereof

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