EP1548698A1 - Steuerschaltung einer Flüssigkristallanzeige und Steuerverfahren dafür - Google Patents

Steuerschaltung einer Flüssigkristallanzeige und Steuerverfahren dafür Download PDF

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Publication number
EP1548698A1
EP1548698A1 EP03029643A EP03029643A EP1548698A1 EP 1548698 A1 EP1548698 A1 EP 1548698A1 EP 03029643 A EP03029643 A EP 03029643A EP 03029643 A EP03029643 A EP 03029643A EP 1548698 A1 EP1548698 A1 EP 1548698A1
Authority
EP
European Patent Office
Prior art keywords
data
pixel
liquid crystal
image memory
frame
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.)
Ceased
Application number
EP03029643A
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English (en)
French (fr)
Inventor
Yung-Hung Shen
Shih-Chung Wang
Yuhren Shen
Cheng-Jung Chen
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
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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 EP03029643A priority Critical patent/EP1548698A1/de
Publication of EP1548698A1 publication Critical patent/EP1548698A1/de
Ceased 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • 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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation

Definitions

  • the invention relates to a driving circuit of a liquid crystal display (LCD) panel and its related driving method according to the pre-characterizing clause of claim 1.
  • LCD liquid crystal display
  • a liquid crystal display has advantages of light weight, low power consumption, and low divergence and is applied to various portable equipment such as notebook computers and personal digital assistants (PDAs).
  • LCD monitors and LCD televisions are gaining in popularity as a substitute for traditional cathode ray tube (CRT) monitors and televisions.
  • CRT cathode ray tube
  • an LCD does have some disadvantages. Because of the limitations of physical characteristics, the liquid crystal molecules need to be twisted and rearranged when changing input data, which can cause the images to be delayed. For satisfying the rapid switching requirements of multimedia equipment, improving the response speed of liquid crystal is desired.
  • a driving circuit receives a plurality of frame data and then generates corresponding data impulses, scan voltages, and timing signals, according to the frame data, in order to control pixel operation of the LCD.
  • Each of the frame data includes data for refreshing all of the pixels within a frame period; thus each of the frame data can be regarded as including a plurality of pixel data, and each of the pixel data is for defining the gray level that a pixel is required to reach within a frame period.
  • each pixel can switch among 256 (2 8 ) gray levels, thus each of the pixel data is 8 bits in length.
  • the present invention aims at providing a driving circuit of an LCD panel and its relating driving method to solve the problem mentioned above.
  • the present invention provides a method for driving an LCD panel.
  • the LCD panel includes a plurality of scan lines, a plurality of data lines, and a plurality of pixels.
  • Each pixel is connected to a corresponding scan line and a corresponding data line, and each pixel includes a liquid crystal device and a switching device connected to the corresponding scan line, the corresponding data line, and the liquid crystal device.
  • the method includes receiving continuously a plurality of frame data, generating a plurality of data impulses for each pixel in every frame period according to the frame data and applying the data impulses to the liquid crystal device of one of the pixels within one frame period via the data line connected to the pixel in order to control the transmission rate of the liquid crystal device of the pixel.
  • Fig.1 showing a timing diagram of pixel data values varying in accordance with the frames.
  • the driving circuit receives a plurality of pixel data used for driving the pixel in sequence.
  • GN, GN+1, GN+2 are the pixel data received in frame periods N, N+1, N+2, and the driving circuit determines the gray level of the pixel in the frame periods N, N+1, N+2 according to the values of the pixel data GN, GN+1, GN+2.
  • the larger the value of the pixel data is, the larger the gray level is.
  • the driving circuit generates a data impulse corresponding to a frame period according to the pixel data GN, GN+1, GN+2, and applies the pulse to a pixel electrode of the corresponding pixel to have the pixel be in the appropriate gray level as required within each frame period.
  • Fig.2 showing a timing diagram of different transmission rates of a pixel, varying in accordance with the frames.
  • Two curves C1, C2 are measured when the driving circuit changes the transmission rate from T1 to T2 beginning at frame period N.
  • the curve C1 shows the transmission rate of a pixel not overdriven corresponding to the frames
  • the curve C2 shows the transmission rate of the pixel overdriven corresponding to the frames.
  • the transmission rate cannot reach a predetermined level in the frame period N but has to wait until the frame period N+2. Such a delay causes blurring.
  • some conventional LCD are overdriven, which means applying a higher or a lower data impulse to the pixel electrode to accelerate the reaction speed of the liquid crystal molecules, so that the pixel can reach the predetermined gray level in a predetermined frame period.
  • the transmission rate has to wait until frame period N+1 to reach T2.
  • the requirement of reaching T2 in the frame period N still remains unsatisfied.
  • the driving circuit 10 is for driving the LCD panel 30, which includes a signal controller 12, a blur clear converter 14, a timing controller 16, a source driver 18, and a gate driver 20.
  • the signal controller 12 is for receiving composite video signals Sc, which includes frame data and timing data for driving the LCD panel 30, and processing the composite video signals Sc to separate them into frame signals G and control signals C.
  • the blur clear converter 14 continuously receives the control signals C and the frame data included in the frame signals G and generates processed frame signals G' including a plurality of overdriven data according to the frame data.
  • the timing controller 16 controls the source driver 18 and the gate driver 20 according to the frame signals G' and the control signals C so that the source driver 18 and the gate driver 20 generate corresponding data line voltages and scan line voltages according to the plurality of overdriven data included in the frame signals G' in order to drive the LCD panel 30 to generate images corresponding to the composite video signals Sc.
  • the LCD panel 30 includes a plurality of scan lines 32, a plurality of data lines 34, and a plurality of pixels 36.
  • Each pixel 36 is connected to a corresponding scan line 32 and a corresponding data line 34, and each pixel 36 has a switching device 38 and a liquid crystal device 39 a.k.a. a pixel electrode.
  • the switching device 38 is connected to the corresponding scan line 32 and the corresponding data line 34, and the source driver 18 and the gate driver 20 control the operation of each pixel 36 via the scan line 32 and the data line 34.
  • scan voltages are applied to the scan lines 32 to turn on the switching devices 38, and data voltages are applied to the data lines 34 and transmitted to the pixel electrodes 30 through the switching devices 38. Therefore, when the scan voltages are applied to the scan lines 32 to turn on the switching devices 38, the data voltages on the data lines 34 will charge the pixel electrodes 39 through the switch devices 38, thereby twisting the liquid crystal molecules.
  • the scan voltages on the scan lines 32 are removed to turn off the switching devices 38, the data lines 34 and the pixels 36 will disconnect, and the pixel electrodes 39 will remain charged.
  • the scan lines 32 turn the switching devices 38 on and off repeatedly so that the pixel electrodes 39 can be repeatedly charged. Different data voltages cause different twisting angles and show different transmission rates. Hence, the LCD 30 displays various images.
  • Fig.5 showing a timing diagram of pixel data values varying in accordance with frames.
  • the driving circuit 10 when driving any pixel 36 of the LCD panel 30, the driving circuit 10 generates a plurality of pixel data used for driving the pixel in sequence. As shown in Fig.5, GN, GN(2), GN+1, GN+1(2), GN+2, GN+2(2), GN+3, GN+3(2) are the pixel data generated in frame periods N, N+1, N+2, N+3.
  • the driving circuit 10 generates two pieces of pixel data for each pixel 36 in every frame period.
  • the driving circuit 10 drives the pixel to reach gray levels in the frame periods N, N+1, N+2, N+3 according to the values of the pixel data GN - GN+2(2). For instance, when the pixel data GN, GN(2) are generated, the source driver of the driving circuit 10 converts the pixel data GN, GN(2) into two corresponding data impulses and then applies them to the liquid crystal device 39 via the data line 32 in the frame period N in order to control the transmission rate of the liquid crystal device 39. Similarly, data impulses corresponding to the pixel data GN+1 - GN+3(2) are applied respectively to corresponding pixel electrodes 39 every half a frame period. Same as the prior art, the larger the value of the pixel data is, the higher the voltage of the corresponding data impulse is, and the larger the gray level value is.
  • Fig.6 showing a timing diagram of the transmission rate of the pixel 36 varying in accordance with the frames.
  • the driving circuit 10 generates two pieces of pixel data in each frame period, and then the source driver 18 generates two corresponding data impulses according to the two pieces of pixel data and applies them to the pixel electrode 39 of the corresponding pixel 36 in order to control the transmission rate and gray level of the pixel electrode 39.
  • the driving circuit 10 changes the transmission rate of the pixel electrode 39 of a pixel 36 from T1 to T2 in the frame period N+1.
  • the pixel electrode 39 is applied with two data impulses corresponding to the pixel data GN+1, GN+1(2) in the frame period N+1 at a time interval of half a frame period.
  • the transmission rate of the pixel electrode 39 cannot reach T2 in the first half period n+2 of the frame period N+1, in the later half period n+3 of the frame period N+1, the pixel electrode 39 is applied with another data impulse, so that the transmission rate can reach T2 in the frame period N+1 as required. Therefore, blurring will not occur.
  • the two pieces of pixel data of each pixel in every frame period are generated by the blur clear converter 14.
  • the blur clear converter 14 includes a multiplier 40, a processing circuit 42, a first image memory 44, a second image memory 46, a first memory controller 48, and a second memory controller 50.
  • the multiplier 40 is for doubling the frequency of the control signal C to generate a multiplied signal C2.
  • the first image memory 44 is controlled by the first memory controller 48 to delay current pixel data Gm for a frame period to generate delayed pixel data Gm-1 according to the control signal C.
  • the processing circuit 42 generates a plurality of overdriven pixel data GN according to the current pixel data Gm and the delayed pixel data Gm-1.
  • the second image memory 46 stores the overdriven pixel data GN, and the second memory controller 50 controls the second image memory 46 to output two overdriven pixel data GN, GN(2) to each pixel 36 within a frame period according to the multiplied signal C2 in order to have the source driver 18 apply two data impulses to a specific pixel 36 within a frame period according to the two overdriven pixel data GN, GN(2) .
  • the blur clear converter 60 functions the same as the blur clear converter 14, which includes a multiplier 62, a first image memory 66, a second image memory 68, a third image memory 70, a memory controller 64, a processing circuit 74, and a comparing circuit 72.
  • the multiplier 62 is for doubling the frequency of the control signal C to generate a multiplied signal C2.
  • the first image memory 66 is for receiving and temporarily storing a plurality of pixel data G.
  • the second image memory 68 delays the plurality of pixel data G for a frame period to generate delayed pixel data Gm-1.
  • the third image memory 70 delays the pixel data Gm-1 for a frame period to generate delayed pixel data Gm-2.
  • the pixel data Gm-2 lags the pixel data Gm-1 for a frame period, and so does the pixel data Gm-1 with respect to the pixel data Gm.
  • the memory controller 64 controls the second image memory 68 and the third image memory 70 to output two overdriven pixel data in each frame period according to the multiplied signal C2.
  • the processing circuit 74 generates two pieces of overdriven pixel data GN-1, GN-1(2) for each pixel 36 in every frame period according to the pixel data Gm-1, Gm-2.
  • the comparing circuit 72 compares the pixel data Gm-1 with the pixel data Gm-2 to determine the values of the overdriven pixel data GN-1, GN-1(2).
  • Fig.9 showing a timing diagram of original pixel data received by the blur clear converter 60 varying in accordance with the frames
  • Fig . 10 showing a timing diagram of overdriven pixel data generated by the blur clear converter 60 varying in accordance with the frames.
  • the original pixel data received by the blur clear converter 60 in the frame periods N and N+1 are respectively Gm and Gm+1, with a difference Diff between each other.
  • the blur clear converter 60 generates the two overdriven pixel data GN+1, GN+1(2) with a difference ⁇ G between each other according to the original pixel data Gm, Gm+1.
  • the difference ⁇ G is determined by the comparing circuit 72 in Fig.8 for driving the pixels 36 according to difference conditions.
  • the difference ⁇ G is determined according to the difference Diff between the original pixel data Gm and Gm+1. For instance, when the difference Diff is less than a specific value, the comparing circuit 72 determines the difference ⁇ G as 0, that is equating the overdriven pixel data GN+1 to the overdriven pixel data GN+1(2). Or when the difference Diff is larger than a specific value, the comparing circuit 72 modulates the difference ⁇ G to drive the LCD panel 30 properly.
  • the present invention discloses a driving circuit and relating driving method to generate two pieces of pixel data in each frame period for every pixel on an LCD panel and then to generate two data impulses according to the two pieces of pixel data and to apply them to each pixel within a frame period in order to change the transmission rate of a pixel electrode.
  • each of the pixels of the LCD panel is applied of a plurality of data impulses within a frame period, so that liquid crystal molecules of the pixels can twist to reach a predetermined gray level within a frame period, and blurring will not occur.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP03029643A 2003-12-22 2003-12-22 Steuerschaltung einer Flüssigkristallanzeige und Steuerverfahren dafür Ceased EP1548698A1 (de)

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EP03029643A EP1548698A1 (de) 2003-12-22 2003-12-22 Steuerschaltung einer Flüssigkristallanzeige und Steuerverfahren dafür

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EP03029643A EP1548698A1 (de) 2003-12-22 2003-12-22 Steuerschaltung einer Flüssigkristallanzeige und Steuerverfahren dafür

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1669975A3 (de) * 2004-12-11 2008-10-01 Samsung Electronics Co., Ltd Flüssigkristall Anzeigevorrichtung und Steuerung ihren Datensignalen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539185A1 (de) * 1991-10-22 1993-04-28 Sharp Kabushiki Kaisha Verfahren und Vorrichtung zum Steuern eines Flüssigkristallanzeigegeräts mit aktiver Matrix
JPH0662355A (ja) * 1992-08-11 1994-03-04 Matsushita Electric Ind Co Ltd 表示素子駆動回路
EP0660297A2 (de) * 1993-12-20 1995-06-28 Sharp Kabushiki Kaisha Flüssigkristallanzeigeeinrichtung und Steuerungsverfahren dafür
EP1122711A2 (de) * 2000-02-03 2001-08-08 Samsung Electronics Co., Ltd. Flüssigkristallanzeige und Steuerverfahren dafür
US20020044115A1 (en) * 2000-08-03 2002-04-18 Akihito Jinda Liquid crystal display device driving method
US20030058264A1 (en) * 2001-09-26 2003-03-27 Adachi Takako Liquid crystal display device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539185A1 (de) * 1991-10-22 1993-04-28 Sharp Kabushiki Kaisha Verfahren und Vorrichtung zum Steuern eines Flüssigkristallanzeigegeräts mit aktiver Matrix
JPH0662355A (ja) * 1992-08-11 1994-03-04 Matsushita Electric Ind Co Ltd 表示素子駆動回路
EP0660297A2 (de) * 1993-12-20 1995-06-28 Sharp Kabushiki Kaisha Flüssigkristallanzeigeeinrichtung und Steuerungsverfahren dafür
EP1122711A2 (de) * 2000-02-03 2001-08-08 Samsung Electronics Co., Ltd. Flüssigkristallanzeige und Steuerverfahren dafür
US20020044115A1 (en) * 2000-08-03 2002-04-18 Akihito Jinda Liquid crystal display device driving method
US20030058264A1 (en) * 2001-09-26 2003-03-27 Adachi Takako Liquid crystal display device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEE B ET AL: "REDUCING GRAY-LEVEL RESPONSE TO ONE FRAME: DYNAMIC CAPACITANCE COMPENSATION", 2001 SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS. SAN JOSE, CA, JUNE 5 - 7, 2001, SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS, SAN JOSE, CA: SID, US, vol. 32, June 2001 (2001-06-01), pages 1260 - 1263, XP001054131 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1669975A3 (de) * 2004-12-11 2008-10-01 Samsung Electronics Co., Ltd Flüssigkristall Anzeigevorrichtung und Steuerung ihren Datensignalen

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