EP1265210A1 - Flat panel display and driving method thereof - Google Patents

Flat panel display and driving method thereof Download PDF

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Publication number
EP1265210A1
EP1265210A1 EP02010298A EP02010298A EP1265210A1 EP 1265210 A1 EP1265210 A1 EP 1265210A1 EP 02010298 A EP02010298 A EP 02010298A EP 02010298 A EP02010298 A EP 02010298A EP 1265210 A1 EP1265210 A1 EP 1265210A1
Authority
EP
European Patent Office
Prior art keywords
display
flat panel
information
graphic source
signal
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
EP02010298A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kwang-Hyun La
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.)
Samsung Display Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1265210A1 publication Critical patent/EP1265210A1/en
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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G09G2370/042—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller for monitor identification
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
    • G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication

Definitions

  • the present invention relates generally to a flat panel display, and more particularly to an apparatus and a method for driving the flat panel display.
  • a typical flat panel display in commercial use includes a liquid crystal display (LCD) and a plasma display panel (PDP) and, in addition, such display as an electro luminescence (EL) has been developed.
  • LCD liquid crystal display
  • PDP plasma display panel
  • EL electro luminescence
  • a flat panel display module has a flat panel in which pixels are arranged in a matrix form between two glass substrates, a PCB (printed circuit board) module for driving the flat panel, and a case for protecting and integrating them.
  • PCB printed circuit board
  • the PCB module for driving the flat panel 40 typically includes a main PCB 10 for receiving RGB image data, synchronization signals, etc., from an external apparatus like a PC, to be processed by a timing controller T-con being a customized integrated circuit in the form of FPGA (flat pin grid array) so that image data and a variety of control signals are produced in accordance with structure of the flat panel 40, a row driver 20 for supplying scanning signals for row signal lines based on row driver control signals 50 and power signals 51 received from the main PCB 10, and a column driver 30 for supplying gray level voltages 61 for the flat panel 40 after receiving the image data and the control signals 60 processed in the main PCB and the gray level voltages 61.
  • a main PCB 10 for receiving RGB image data, synchronization signals, etc., from an external apparatus like a PC, to be processed by a timing controller T-con being a customized integrated circuit in the form of FPGA (flat pin grid array) so that image data and a variety of control signals are produced in accordance with structure of the flat panel
  • the timing conditions for input of the flat panel display is basically set to be suitable for VESA specification, and allows a graphic source to produce and display digital interface timing control signals for driving the panel on the basis of digital data communication (DDC) information stored in the flat panel display module.
  • DDC digital data communication
  • flat panel display monitor products on the market set gamma voltages and various power sources for differentiating gray.
  • a user can adjust gamma voltages, flicker voltages, brightness, scaling, frame rate control (FRC), I/O format, etc., by identifying and adjusting a screen display state using an On Screen Display (OSD) function or directly adjusting a hardware.
  • OSD On Screen Display
  • an optimal screen can be driven by modifying timing (modifying a driving frequency or modification to least and optimal blanking time) on the flat panel driving circuit or a very good driving environment can be achieved by processing a standard signal through an additional circuit in the graphic source so that the driving frequency is modified or the modification to the least and optimal blanking time is made, as referred to above, as an I/O format is required to satisfy the requirement to a general display standard, however good the above conditions may be, a risk to the modification is very high.
  • an interface is required to drive a different I/O format of display source for use in a monitor, and if a difference occurs in a frame frequency or the number of blanking interval, an additional system board (such option board as A/D board, D/D board, etc.), which is capable of FRC adjustment, should be supported.
  • an additional system board such option board as A/D board, D/D board, etc.
  • the I/O format of the flat panel display is limited and efficiency of the display products cannot be up to 100%.
  • a jitter caused by the option board and a mismatch of bidirectional interface conditions result in poor quality of picture and little contribution to characteristic optimization of the monitor products.
  • a fixation in the flat panel display is caused by a difference in display manner from a CRT display.
  • the CRT can drive widely up to from 40 Hz to 85 Hz in the frame frequency while the driving manner of the flat panel display is fixed by the characteristics of the panel.
  • the characteristics of the current panel is optimized at the frame frequency of 60 Hz, the driving conditions also becomes necessarily optimized at 60 Hz.
  • a graphic card or the display source does not wholly follow a VESA standard, different manufacturers supply data of various timing slightly different from standard timing due to occurrence of slight deviation.
  • a blanking interval horizontal synchronization signal, back porch, front porch
  • a blanking interval vertical synchronization signal, back porch, front porch
  • the display characteristics should be adjusted based on product tolerance or user' environment and conditions.
  • these flat panel monitor products are conventionally set with the optimal driving conditions fixed in accordance with characteristic of the flat panel, an adjustment should be made by an additional option board or an interface board.
  • an adjustment should be made by an additional option board or an interface board.
  • gamma, contrast, brightness, flicker, and other display characteristics when the optimal driving conditions fixed in accordance with characteristic of the flat panel is modified, there were the problems that the flat panel characteristics can be used with 100% efficiency since contrasted upper and lower gray levels are fitted to the flat panel in a truncated state by clamping when the A/D board or the option board is used.
  • the display characteristics information of the flat panel is alterable by a predetermined signal outputted from the graphic source to the serial bus, corresponding to the input of predetermined data by use of a predetermined program by a user.
  • the display characteristics information is alterable by the input of predetermined data by use of a predetermined key installed outside the flat panel display by a user.
  • the display characteristics information of the flat panel includes more than one of standard information of the display signal with its blanking interval defined and screen display information.
  • the graphic source fetches and interprets the display characteristics information of the flat panel from the flat panel display module via the serial bus so that a new corresponding standard of display signal can be outputted.
  • the display characteristics information is alterable by the input of predetermined data by use of a predetermined key installed outside the flat panel display by a user and includes more than one of standard information of the display signal with its blanking interval defined and screen display information.
  • a method for driving a flat panel display for processing and displaying a display signal outputted from the graphic source via a serial bus comprises the steps of: (a) outputting a predetermined signal from the graphic source corresponding to the modification and input of the display characteristics information of the flat panel by use of a predetermined program by a user; (b) modifying the display characteristic information of the flat panel stored in a flat panel display module by use of the predetermined signal outputted from the graphic source; (c) fetching and interpreting in the graphic source the display characteristics information of the flat panel from the flat panel display module via the serial bus; and (d) outputting a new corresponding standard of display signal from the graphic source depending on a result of the interpretation.
  • the method for driving a flat panel display further comprises (e) modifying the display characteristics information by the input of predetermined data by use of a predetermined key installed outside the flat panel display by a user.
  • a liquid crystal display(a flat panel display) basically includes a graphic source 300 including a graphic source unit 310, and a liquid crystal display module 400 including a connector 410, a D/A converter 420, a memory 430 and a timing controller 440.
  • the liquid crystal display according to the present invention can realize the function of the conventional option board and further, although the option board is removed, realize more function than the conventional option board can do, thereby resulting in the cost reduction.
  • the conventional option board is not required in the present invention, its employment does not prevent realizing all features of the present invention.
  • the graphic source unit 310 is a part of the graphic source 300 such as a PC main body or another system outputting picture signals and functions as an apparatus for generating and outputting synchronization signals, graphic signals and other control signals. Particularly, by fetching and interpreting the display characteristic information of the liquid crystal display panel (flat panel) from the flat panel display module via serial buses, the graphic source unit 300 outputs a new corresponding standard of display signal.
  • the connector 410 refers to a connector for serial buses such as a DVI (digital video interactive) or a D-SUB for receiving a display signal from the graphic source unit 310 of the graphic source 300 like the PC main body via cables 311 and 312.
  • DVI digital video interactive
  • D-SUB digital video interactive
  • the D/A converter 420 converts screen display information included in the display characteristic information of the liquid crystal panel stored in the memory 430 into analog signals.
  • the screen display information such as gamma voltage, flicker voltages and brightness is received with digital data, and then converted into analog data to be provided for corresponding circuits of the PCB module.
  • a series of operation described above as well as the operation of the typical liquid crystal display is executed under the control of the timing controller 440.
  • the memory 430 stores the display characteristic information of the flat panel modifiable by a user and is shared with the graphic source unit 310.
  • the display characteristic information of the liquid crystal panel is the information on the standard of the liquid crystal panel, which contains the resolution and the operation frequencies such as vertical and horizontal frequencies of picture signals and a main frequency of a picture signal for driving the liquid crystal panel as well as the digital information on gamma voltage, flicker voltage, brightness, etc., adjustable by a user.
  • the timing controller 440 receives and processes the display signals from the graphic source unit 310 via the serial bus to output the display signals for driving the liquid crystal panel.
  • the display signals of the liquid crystal panel such as picture signal, control signals, etc., corresponding to the display characteristic information of the liquid crystal panel is outputted to be provided for corresponding circuits of the PCB module.
  • the liquid crystal panel display module 400 receives signals from the graphic source 300, which are fixed in standard signals in such as VESA, and processing them by means of the option board and the timing controller so that FRC or I/O format and so forth is adjusted to some extent.
  • the signals themselves outputted from the typical graphic source 300 has not adjusted FRC or I/O format and so forth.
  • the display characteristic information of the liquid crystal panel stored in the memory 430 is transmitted as DDC information to the graphic source unit 310 via the serial buses 411 and 412.
  • the graphic source unit 310 interprets this information to provide various display signals corresponding to the result of this interpretation for the liquid crystal panel display module 400 via the cable 311 and 312.
  • the display characteristic information of the liquid crystal panel is included in the DDC information shared between the graphic source unit 310 and the memory 430 of the liquid crystal panel display module 400.
  • the display characteristic information of the liquid crystal panel can be modified by a user using predetermined application programs, and then the modified or updated information is re-stored in the memory 430.
  • the graphic source unit 310 fetches and interprets the updated information in the memory 430.
  • the user recommends the optimal conditions adaptable to the liquid crystal panel to the graphic source 300 so that the graphic source unit (PC or other display system) 310 can adjust directly an input timing.
  • the display characteristic information of the liquid crystal panel which can be modified by a user using the predetermined application programs includes FRC, I/O format, and other screen display (brightness, gamma, flicker, etc.) information shown on the screen, as described above.
  • the liquid crystal display module 400 operates by new standard picture signals other than VESA standard signals.
  • a conventional display signal produced by the graphic source unit 310 includes a synchronization signal portion ( ⁇ ), a back porch ( ⁇ ), a portion carrying picture data ( ⁇ ) and a front porch ( ⁇ ), and is characterized in that the back porch ( ⁇ ) is slightly longer than the front porch ( ⁇ ), as shown in Fig. 3.
  • a portion carrying picture data ( ⁇ ) is relatively long, and a synchronization signal ( ⁇ ), a back porch ( ⁇ ) and a front porch ( ⁇ ) occupy an appropriate portion as narrow as required for processing signals for driving the liquid crystal panel, as shown in Fig. 4.
  • To adjust the blanking interval using a predetermined application program means that the times for the standard information of the display signal, i.e., the portion carrying picture data ( ⁇ ), the synchronization signal portion ( ⁇ ), the back porch ( ⁇ ) and the front porch ( ⁇ ) are defined so that the graphic source unit 310 produces a new standard of display signal.
  • the graphic source unit 310 fetches and interprets this information so that corresponding display signals are generated to be transmitted to the liquid crystal panel display module 400.
  • the timing controller 440 produces various control signals and the picture signals required for driving the liquid crystal panel and provides them for the corresponding circuits of the PCB module via wires 441.
  • the D/A converter 420 converts digital data for state of gamma, flicker, and brightness to provide for corresponding circuits of the PCB module via wires 421 under the control of the timing controller 440 based on the display characteristics information stored in the memory 430.
  • a user can adjust the display characteristics information representing the display state of the screen using the predetermined application program, this can be also implemented in combination with input of a predetermined data from a user by use of a preset key installed outside the liquid crystal display, as the OSD function is supported in all monitor.
  • the graphic source unit 310 fetches and interprets the display characteristics information of the liquid crystal panel from the liquid crystal panel display module 400 via the serial buses so that new corresponding standard of the display signals can be outputted.
  • the display characteristics information of the liquid crystal panel is alterable by the input of predetermined data from a user by use of a preset key installed outside the liquid crystal display device as well as by the predetermined signal outputted from the graphic source unit 310 to the serial buses, corresponding to input of the predetermined data from a user by use of the predetermined program.
  • liquid crystal display according to the embodiments of the present invention is applicable to such general flat panel displays as plasma display panel (PDP) and organic electro-luminescent (EL) display having a driving way in the PCB module similar to that of the liquid crystal display, in addition to the liquid crystal display.
  • PDP plasma display panel
  • EL organic electro-luminescent
  • the graphic card for display or the display source searches an I/O interfaced optimal conditions by fetching a driving conditions of the flat panel via the serial bus or I 2 C bus of an interface cable connector of DVI or D-SUB and the like with an I/O format information or transmits a setting value of an optimized conditions defined by an adjustment by a user or an I/O timing required by the display source to the flat panel so that a display timing required by the display source can be set, a graphic signal can be supported by any standard of timing conditions other than VESA.
  • the flat panel can be driven at a driving frequency lower than that of VESA standard, resulting in improvement of the display characteristics due to enlargement of charge time for pixel display or time to spare for processing of pixel data.
  • timing for an optimal driving conditions of the flat panel must be different from that of VESA standard signal or the standard signal has a slight deviation dependent on manufacturers
  • serial bus I 2 C bus, SPI bus, 3-wire bus, etc.
  • DDC display information so that correct input/output information can be stored and continuously updated and a continuous adjustment can be made in the presence of variation of an external environment
  • gamma among the display characteristics is fixed at a target value by a fixed voltage generated by resistances or in a voltage-divided manner from the external. This makes gamma for the entire gray level not adjustable when contrast or brightness is adjusted by using the A/D board or other intermediate interface.
  • the present invention allows a desired gamma adjustment with use efficiency of 100 % of brightness of the flat panel and without a change of gray level characteristics level of products by setting freely a voltage through the serial buses.
  • values adjusted by a user or set by requirement of the graphic source are stored in a storage such as a memory shared through the serial buses so that state and information of the monitor product are shared and adjustable and an optimal display characteristics information is manageable by an upload/reload operation.

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  • Engineering & Computer Science (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)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Liquid Crystal (AREA)
EP02010298A 2001-06-04 2002-05-21 Flat panel display and driving method thereof Ceased EP1265210A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020010031093A KR100777702B1 (ko) 2001-06-04 2001-06-04 플랫 패널 표시 장치 및 이의 구동 방법
KR2001031093 2001-06-04

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EP1265210A1 true EP1265210A1 (en) 2002-12-11

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EP (1) EP1265210A1 (zh)
JP (2) JP2002366123A (zh)
KR (1) KR100777702B1 (zh)
CN (1) CN100423071C (zh)
TW (1) TW554308B (zh)

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EP1507253A2 (de) * 2003-08-11 2005-02-16 Kontron Embedded Modules GmbH Anzeigeadapter
EP1530001A1 (de) 2003-11-06 2005-05-11 Dicom AG Befestigungsvorrichtung für einen Flachbildschirm und Flachbildschirm
EP1530118A1 (de) 2003-11-06 2005-05-11 Dicom AG Erweiterungsvorrichtung für einen Flachbildschirm und Flachbildschirm
US8179388B2 (en) 2006-12-15 2012-05-15 Nvidia Corporation System, method and computer program product for adjusting a refresh rate of a display for power savings
US8207977B1 (en) 2007-10-04 2012-06-26 Nvidia Corporation System, method, and computer program product for changing a refresh rate based on an identified hardware aspect of a display system
US8284210B1 (en) 2007-10-04 2012-10-09 Nvidia Corporation Bandwidth-driven system, method, and computer program product for changing a refresh rate
CN102918853A (zh) * 2010-06-01 2013-02-06 英特尔公司 用于立体三维系统中的自适应稳定图像时序的方法和装置
US8451279B2 (en) 2006-12-13 2013-05-28 Nvidia Corporation System, method and computer program product for adjusting a refresh rate of a display
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JP5371856B2 (ja) * 2010-03-26 2013-12-18 セイコーインスツル株式会社 携帯機器
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JP5135483B2 (ja) * 2012-05-08 2013-02-06 株式会社東芝 映像表示装置
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1507253A2 (de) * 2003-08-11 2005-02-16 Kontron Embedded Modules GmbH Anzeigeadapter
EP1507253A3 (de) * 2003-08-11 2007-12-12 Kontron Embedded Modules GmbH Anzeigeadapter
EP1530001A1 (de) 2003-11-06 2005-05-11 Dicom AG Befestigungsvorrichtung für einen Flachbildschirm und Flachbildschirm
EP1530118A1 (de) 2003-11-06 2005-05-11 Dicom AG Erweiterungsvorrichtung für einen Flachbildschirm und Flachbildschirm
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JP2002366123A (ja) 2002-12-20
KR20020094233A (ko) 2002-12-18
JP5061148B2 (ja) 2012-10-31
KR100777702B1 (ko) 2007-11-21
JP2009181139A (ja) 2009-08-13
CN100423071C (zh) 2008-10-01
TW554308B (en) 2003-09-21
CN1389849A (zh) 2003-01-08

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