KR20130048491A - Display panel driving device for reduceing the difference in slew rate among data lines - Google Patents

Display panel driving device for reduceing the difference in slew rate among data lines Download PDF

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Publication number
KR20130048491A
KR20130048491A KR1020110113358A KR20110113358A KR20130048491A KR 20130048491 A KR20130048491 A KR 20130048491A KR 1020110113358 A KR1020110113358 A KR 1020110113358A KR 20110113358 A KR20110113358 A KR 20110113358A KR 20130048491 A KR20130048491 A KR 20130048491A
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KR
South Korea
Prior art keywords
source driver
driver chip
data lines
main source
slave
Prior art date
Application number
KR1020110113358A
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Korean (ko)
Inventor
전용원
남장진
손장섭
Original Assignee
주식회사 티엘아이
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Application filed by 주식회사 티엘아이 filed Critical 주식회사 티엘아이
Priority to KR1020110113358A priority Critical patent/KR20130048491A/en
Publication of KR20130048491A publication Critical patent/KR20130048491A/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/26—Current mirrors
    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45248—Indexing scheme relating to differential amplifiers the dif amp being designed for improving the slew rate

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: A display panel operating device reducing a slew rate deviation between data lines is provided to reduce a slew rate deviation between data lines by operating the data lines by using the same reference current. CONSTITUTION: A main source driver chip(MCHP) receives image data(DIM) provided from the outside of a driver package(PKG). The main source driver chip operates a data line(DL) included in a line group(GDLM). The main source driver chip generates reference currents(IR) having the same value. A plurality of slave source driver chips(SCHP) receive the image data. The slave source driver chips operate the data line included in another line group(GDLS).

Description

DISPLAY PANEL DRIVING DEVICE FOR REDUCEING THE DIFFERENCE IN SLEW RATE AMONG DATA LINES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel drive device, and more particularly, to a display panel drive device for reducing slew rate variation between data lines.

A display panel is a display device that displays an image by using input image data of digital data, and has been increasingly high resolution and large. Accordingly, the display panel driver for driving the display panel includes a plurality of source driver chips for driving data lines of corresponding line groups of the display panel, and is typically packaged by a driver package.

Recently, in order to miniaturize a driver package, a technology has been developed in which one source driver chip of a display panel driving apparatus receives image data from the outside and provides the remaining source driver chip in a data chain form.

1 is a view for explaining a conventional display driving device (SCDRV). The display driving apparatus SCDRV of FIG. 1 includes one main source driver chip MCHP and a plurality of slave source driver chips SCP. The timing controller TCON of the main source driver chip MCHP receives the image data DIM provided from the outside of the driver package PKG, and transmits the image data DIM to the plurality of slave source driver chips SCH in a data chain form. Provide image data (DIM).

Each of the main source driver chip MCHP and the slave source driver chips SHP includes reference current generators GIRM and GIMS for generating respective reference currents IRM and IRS. In addition, the source drivers SDRM and SDRS of each of the main source driver chip MCHP and the slave source driver chips SSCH may have their respective reference currents IRM and IRS through embedded current mirrors IMRM and IMRS. And driving the data line DL of the line group GDL corresponding to each other to provide a voltage according to the respective image data DIM.

However, configurations of the main source driver chip MCHP and the slave source driver chips SCP are different from each other. As a result, the reference current IRM of the main source driver chip MCHP and the reference current IRS of the slave source driver chips SCP may be different from each other.

Therefore, in the existing display panel driving apparatus, data lines driven by the main source driver chip MCHP and data lines driven by the slave source driver chips SCP have different slew rates. As a result, there is a problem that causes a noise phenomenon such as block dim of the display panel.

Disclosure of Invention An object of the present invention is to provide a display panel driving apparatus for reducing the slew rate variation between data lines, to solve the problems of the existing technology.

One aspect of the present invention for achieving the above technical problem relates to a display panel driving apparatus for driving a display panel for displaying an image according to a voltage provided through a plurality of data lines divided into a plurality of line groups. The display panel driving apparatus of the present invention is a main source driver chip corresponding to any one of the plurality of line groups, wherein the display panel driving device drives the data lines included in the line group thereof with a voltage according to image data corresponding thereto. Main source driver chip; And at least one slave source driver chip corresponding to another one of the plurality of line groups, wherein the at least one slave data driver drives data lines included in the line group with a voltage according to image data corresponding to the at least one slave source driver chip. It has a slave source driver chip. The main source driver chip is driven to generate reference currents of the same value, and each of the main source driver chip and the at least one slave source driver chip drives the respective data lines using the corresponding reference current. do.

According to the display panel driving apparatus of the present invention, since the respective data lines are driven using the same reference current IR, the slew rate deviation between the data lines is significantly reduced. Accordingly, in the display panel driven by the display panel driving apparatus of the present invention, the possibility of causing noise phenomenon such as block dim is significantly reduced.

A brief description of each drawing used in the present invention is provided.
1 is a view for explaining a conventional display driving apparatus.
2 is a view for explaining a display panel driving apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a current generator of FIG. 2 and a current mirror of each source driver chip.

For a better understanding of the present invention and its operational advantages, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which illustrate preferred embodiments of the invention, and the accompanying drawings. In understanding each of the figures, it should be noted that like parts are denoted by the same reference numerals whenever possible. Further, detailed descriptions of known functions and configurations that may be unnecessarily obscured by the gist of the present invention are omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view for explaining a display panel driving apparatus according to an embodiment of the present invention. The display panel driving device SCDRV of the present invention drives the display panel DISPAN. In this case, the display panel DISPAN displays an image according to a voltage provided through a plurality of data lines DL divided into a plurality of line groups GDLM and GDLS.

Referring to FIG. 2, the display panel driving device SCDRV of the present invention includes a main source driver chip MCHP and at least one slave source driver chip SCP. In FIG. 2, four slave source driver chips (SCHPs) are shown by way of example.

The main source driver chip MCHP corresponds to one of the plurality of line groups GDLM. The main source driver chip MCHP receives the image data DIM provided from the outside of the driver package PKG for packaging the display panel driving device SCDRV of the present invention. In addition, the main source driver chip MCHP drives the data lines DL included in its line group GDLM with a voltage according to its image data DIM.

The at least one slave source driver chip (SCHP) corresponds to the other one of the plurality of line groups (GDLS). The slave source driver chip (SCHP) receives its image data (DIM) in the form of a data chain from the main source driver chip (MCHP). In addition, the slave source driver chip SCP drives the data lines DL included in its line group GDLS with a voltage according to its image data DIM.

In this case, the main source driver chip MCHP is driven to generate reference currents IR having the same value, and both the main source driver chip SCHP and the at least one slave source driver chip SSCH are respectively provided. Each of the data lines DL is driven using the corresponding reference current IR.

In an exemplary embodiment, the main source driver chip MCHP includes a timing controller TCON, a reference current generator GIR, and a main source driver SDRM.

The timing controller TCON receives the image data DIM. In addition, the timing controller TCON provides the received image data DIM to the slave source driver chip SCP in the form of a data chain.

The reference current generator GIR generates the reference currents IR.

The main source driver SDRM may include the data lines included in the line group GDLM at a voltage according to the image data DIM of the main source driver SDRM using the corresponding reference current IR. Drive DL.

In addition, the slave source driver chip (SCHP) has a slave source driver (SDRS). The slave source driver SDRS uses the corresponding reference current IR to include the data lines included in the line group GDLS at a voltage corresponding to the image data DIM thereof. Drive DL.

More preferably, the main source driver unit SDRM and the slave source driver unit SDRS drive the current mirror units IMRM and IMRS.

As shown in FIG. 3, the current mirror units IMRM and IMRS of the main source driver unit SDRM and the slave source driver unit SDRS mirror the corresponding reference current IR, respectively. The driving currents IDRM and IDRS driving the data lines DL of the line groups GDLM and GDLS are generated.

In this case, the driving current IDRM for driving the data line DL of the line group GDLM corresponding to the main source driver chip MCHP and the line group GDLS corresponding to the slave source driver chip SCP are included. The driving current IDRS for driving the data line DL is about the same size.

As such, in the display panel driving apparatus SCDRV according to the preferred embodiment of the present invention, the main source driver chip MCHP and the slave source driver chip SCHP each have their own data lines using the same reference current IR. By driving the first and second DLs, the data lines DL of the line group GDLM corresponding to the main source driver chip MCHP and the line group GDLS corresponding to the slave source driver chip SCHP. The slew rate deviation between the data lines DL is significantly reduced.

Accordingly, in the display panel DISPAL driven by the display panel driving apparatus SCDRV of the present invention, the possibility of occurrence of noise phenomenon such as block dim is significantly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

For example, in this specification, an embodiment in which the main source driver chip receives image data from the outside and the slave source driver chip receives its image data in the form of a data chain to the main source driver chip has been shown and described. . However, it is obvious that the technical idea of the present invention can be implemented by the embodiment in which the slave source driver chip directly receives the main source driver chip without passing through it.

Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (5)

A display panel driving apparatus for driving a display panel for displaying an image according to a voltage provided through a plurality of data lines divided into a plurality of line groups.
A main source driver chip corresponding to any one of the plurality of line groups, the main source driver chip driving data lines included in the line group thereof with a voltage according to image data corresponding thereto; And
At least one slave source driver chip corresponding to any one of the plurality of line groups, wherein the at least one slave drives data lines included in its line group with a voltage according to image data corresponding thereto Source driver chip,
The main source driver chip
Driven to generate reference currents of the same value,
Each of the main source driver chip and the at least one slave source driver chip is
And driving the respective data lines by using the corresponding reference current.
The method according to claim 1,
The main source driver chip
Receiving the image data corresponding to itself from the outside,
The at least one slave source driver chip
And the image data corresponding to the self from the main source driver chip in the form of a data chain.
The method of claim 2, wherein the main source driver chip
A timing controller receiving the image data and providing the received image data to the at least one slave source driver chip in a data chain form;
A reference current generator for generating the reference currents; And
And a main source driver unit for driving the data lines included in the line group thereof with a voltage according to the image data thereof by using the corresponding reference current.
The method of claim 3, wherein the main source driver chip
The at least one slave source driver chip
And a slave source driver for driving the data lines included in the line group with the voltage corresponding to the image data of the device using the corresponding reference current.
5. The method of claim 4,
Each of the main source driver chip and the slave source driver unit
And a current mirror unit configured to mirror corresponding reference currents to generate driving currents for driving data lines of respective line groups.
KR1020110113358A 2011-11-02 2011-11-02 Display panel driving device for reduceing the difference in slew rate among data lines KR20130048491A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170080776A (en) * 2015-12-30 2017-07-11 엘지디스플레이 주식회사 Organic light emitting diode display and calibration method thereby
KR20180015571A (en) * 2016-08-03 2018-02-13 주식회사 실리콘웍스 Display driving device
KR20180135150A (en) * 2017-06-09 2018-12-20 삼성전자주식회사 Display driving device including source driver and timing controller and operating method of display driving device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170080776A (en) * 2015-12-30 2017-07-11 엘지디스플레이 주식회사 Organic light emitting diode display and calibration method thereby
KR20180015571A (en) * 2016-08-03 2018-02-13 주식회사 실리콘웍스 Display driving device
CN109564744A (en) * 2016-08-03 2019-04-02 硅工厂股份有限公司 Display drive apparatus
CN109564744B (en) * 2016-08-03 2022-07-05 硅工厂股份有限公司 Display driving device
KR20180135150A (en) * 2017-06-09 2018-12-20 삼성전자주식회사 Display driving device including source driver and timing controller and operating method of display driving device

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