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KR100672963B1 - Hybrid drive device for PM-OLD display device - Google Patents

Hybrid drive device for PM-OLD display device Download PDF

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KR100672963B1
KR100672963B1 KR1020050117772A KR20050117772A KR100672963B1 KR 100672963 B1 KR100672963 B1 KR 100672963B1 KR 1020050117772 A KR1020050117772 A KR 1020050117772A KR 20050117772 A KR20050117772 A KR 20050117772A KR 100672963 B1 KR100672963 B1 KR 100672963B1
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설정훈
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주식회사 인테그마
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3216—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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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)
  • Control Of El Displays (AREA)

Abstract

본 발명은 6비트 PWM 발생기에 오차가 낮은 2비트 전류형 DAC를 추가하여 6비트 PWM 발생기에 의해 펄스폭이 변조된 신호 후단에 2비트 전류형 DAC에 의해 펄스 크기가 변조된 신호가 출력되도록 하여 회로의 구성요소를 많이 늘이지 않고 256 계조를 적용시킬 수 있도록 하는 PM-OLED 디스플레이장치용 하이브리드 구동장치에 관한 것으로서, PM-OLED 하이브리드 구동장치에 있어서, 8비트 데이터를 2비트 및 6비트씩 나누어 출력하는 드라이버 아이시 제어부; 상기 드라이버 아이시 제어부에서 출력되는 2비트 데이터 및 6비트 데이터를 입력받아 펄스폭이 변조된 신호에 대응하여 4 단계의 펄스 크기가 변조된 신호를 생성하고, 상기 생성된 신호에 의해 PM-OLED 패널이 구동되도록 하는 데이터 드라이버 아이시; 및 상기 드라이버 아이시 제어부에서 출력되는 제어신호에 응하여 상기 OLED 패널로 스캔 데이터를 출력하는 스캔 드라이버로 이루어진 것을 특징으로 한다.The present invention adds a 2-bit current DAC having a low error to a 6-bit PWM generator so that a signal whose pulse size is modulated by a 2-bit current-type DAC is output after a pulse width modulated signal by a 6-bit PWM generator. The present invention relates to a hybrid driving device for a PM-OLED display device capable of applying 256 gray scales without greatly increasing circuit components. In the PM-OLED hybrid driving device, 8-bit data is divided into 2 and 6 bits. A driver Icy controller for outputting; Receives 2-bit data and 6-bit data output from the driver Icy controller, and generates a signal in which the pulse size is modulated in four stages in response to a pulse-modulated signal, and generates the PM-OLED panel by the generated signal. Data driver for causing the drive to be driven; And a scan driver configured to output scan data to the OLED panel in response to a control signal output from the driver chassis controller.

Description

ＰＭ －ＯＬＥＤ 디스플레이 장치용 하이브리드 구동장치{Hybrid driving device for Displaying device of Passive Matrix OLED}Hybrid driving device for PLM-OLD display device {Hybrid driving device for Displaying device of Passive Matrix OLED}

도 1은 종래기술에 의한 OLED 디스플레이 구동장치의 구성을 설명하기 위한 도면,1 is a view for explaining the configuration of the OLED display driving apparatus according to the prior art,

도 2는 도 1에 적용된 6비트 PWM 발생기의 출력파형도,2 is an output waveform diagram of a 6-bit PWM generator applied to FIG.

도 3은 종래 기술에 따른 화면 계조 특성을 설명하기 위한 도면,3 is a view for explaining a screen gray scale characteristic according to the prior art;

도 4는 종래 기술에 의한 OLED 하이브리드 구동장치의 구성을 설명하기 위한 도면,4 is a view for explaining the configuration of the OLED hybrid driving apparatus according to the prior art,

도 5는 도 4에 적용된 전류 DAC 및 PWM 발생기에 의해 형성된 출력파형도,5 is an output waveform diagram formed by the current DAC and PWM generator applied to FIG.

도 6은 본 발명에 따른 PM-OLED 디스플레이 장치용 하이브리드 구동장치의 구성을 설명하기 위한 도면,6 is a view for explaining the configuration of a hybrid drive device for a PM-OLED display device according to the present invention;

도 7은 도 6에 적용된 PWM 발생기 및 전류 DAC에 의해 형성된 출력파형도,7 is an output waveform diagram formed by the PWM generator and the current DAC applied to FIG.

도 8은 데이터 출력 파형도,8 is a data output waveform diagram;

도 9는 본 발명에 다른 화면 계조 특성을 설명하기 위한 도면이다.9 is a diagram for explaining screen gray scale characteristics according to the present invention.

*** 도면의 주요부분에 대한 부호설명 ****** Explanation of main parts of drawing ***

600 : 드라이버 아이시 제어부600: driver Icy control unit

650 : 데이터 드라이버 아이시650: Data Driver Icy

651 : PWM 발생기651: PWM Generator

652 : 전류 DAC652: current DAC

653 : 전류원653: current source

654 : 스위치부654: switch unit

655 : 리셋 스위치부655: reset switch unit

700 : 스캔 드라이버700: scan driver

750 : PM-OLED 패널750: PM-OLED Panel

본 발명은 PM-OLED 디스플레이 장치용 하이브리드 구동장치에 관한 것이다.The present invention relates to a hybrid drive for a PM-OLED display device.

보다 상세하게는 6비트 PWM 발생기에 오차가 낮은 2비트 전류형 DAC를 추가하여 6비트 PWM 발생기에 의해 펄스폭이 변조된 신호 후단에 2비트 전류형 DAC에 의해 펄스 크기가 변조된 신호가 출력되도록 하여 회로의 구성요소를 많이 늘이지 않고 256 계조를 적용시킬 수 있도록 하는 PM-OLED 디스플레이장치용 하이브리드 구동장치에 관한 것이다.More specifically, a 2-bit current DAC with a low error is added to the 6-bit PWM generator so that a signal whose pulse size is modulated by the 2-bit current DAC is output after the pulse width modulated signal by the 6-bit PWM generator. Therefore, the present invention relates to a hybrid driving device for a PM-OLED display device, which can apply 256 gray levels without increasing a large number of circuit components.

일반적으로 휴대용기기에 적용되고 있는 유기발광다이오드 패널 (OLED Panel)은 현재 최대 262,144 컬러를 표현 하고 있다. 이는 R/G/B 각 64 계조표현이 가능함을 나타낸다. In general, organic light emitting diode panels (OLED panels), which are applied to portable devices, currently display up to 262,144 colors. This indicates that 64 gray levels can be expressed for each of R / G / B.

상기와 같이 R/G/B 각 64 계조를 표현하기 위한 종래기술에서의 OLED 구동장치에 적용된 드라이버 아이시 제어부(10)는 6비트 PWM 발생기(24)로 데이터를 6비트씩 출력하고, 상기 6비트 PWM 발생기(24)는 상기 6비트씩 입력되는 데이터에 응하여 도 2에 도시된 펄스를 발생시켜 스위치부(22)의 온/오프 상태를 제어한다. As described above, the driver IC controller 10 applied to the OLED driving apparatus in the related art for expressing each of the 64 gray levels of R / G / B outputs 6 bits of data to the 6-bit PWM generator 24, and 6 The bit PWM generator 24 controls the on / off state of the switch unit 22 by generating the pulse shown in FIG.

상기와 같이 구성된 OLED 구동장치의 OLED 패널에 표시되는 화면의 계조특성은 첨부 도면 도 3에 도시된 바와 같이 감소하게 되어 화질의 저하를 가져오게 된다.The gray scale characteristic of the screen displayed on the OLED panel of the OLED driving device configured as described above is reduced as shown in FIG. 3, resulting in a deterioration in image quality.

상기와 같이 6비트 PWM 발생기(24)를 이용하여 비선형 보정 과정을 수행하는 경우 첨부 도면 도 3에 도시된 바와 같이 총 64단계의 6-bit 룩업 테이블로는 완전한 비선형 특성을 이룰 수 가 없으며, 특히 저 계조에서 비선형특성과 룩업 테이블 출력과의 편차가 심하게 되어 선명도가 감소된다는 문제점이 있다.In the case of performing the nonlinear correction process using the 6-bit PWM generator 24 as described above, as shown in FIG. 3, a total of 64 steps of the 6-bit lookup table may not achieve a complete nonlinear characteristic. At low gray levels, there is a problem that the sharpness of the non-linear characteristic and the look-up table output become severe and the sharpness is reduced.

주로 문자 정보 디스플레이 위주의 1인치 이하의 소형 패널에서는 262,144 컬러 사용이 주류이지만, 동영상이나 사진 영상 등의 영상정보 디스플레이로 변화되고 특히, 상용 OLED의 패널크기가 기존 96x64, 96x96에서 128x160, 176x240 등으로 커짐에 따라 상기와 같은 계조특성의 문제점이 더 크게 부각되었다.The use of 262,144 colors is the mainstream in small panels of 1 inch or less, mainly for character information display, but it is changed to video information display such as video and photographic image. As it became larger, the above-described problem of gray scale characteristics was more highlighted.

또한, 기존의 패시브 매트릭스용 구동 IC의 경우 구동방식에 따라 펄스폭 변조방식(PWM)과 펄스 크기 변조방식(PAM)으로 나눠지며, PWM 방식의 경우 첨부 도면 도 4에 도시된 바와 같이 8비트 감마 보정부(100)는 6비트 입력에 대해 8비트의 출력값을 상기 데이터 드라이버 아이시(200)의 2비트 전류 DAC(205)와 PWM 발생기(210)로 출력한다. 즉, 8비트 감마 보정부(100)의 6비트ㅧ 8비트 감마 룩업 테이블의 출력값은 디지털로 표시하면 8bit값을 가지게 되며, 상기 8비트 데이터 중 LSB(Least Significant Bit, 최하위 비트)부분인 2비트는 전류 DAC(205)로 입력되며, MSB(Most Significant Bit, 최상위 비트)부분인 나머지 6비트는 PWM 발생기(210)로 입력된다.In addition, in the case of the conventional passive matrix driver IC, a pulse width modulation method (PWM) and a pulse size modulation method (PAM) are divided according to a driving method. The correction unit 100 outputs an 8-bit output value for the 6-bit input to the 2-bit current DAC 205 and the PWM generator 210 of the data driver IC 200. That is, the output value of the 6-bit ㅧ 8-bit gamma lookup table of the 8-bit gamma correction unit 100 has an 8-bit value when digitally displayed. The 2-bit which is the LSB (Least Significant Bit) part of the 8-bit data. Is input to the current DAC 205 and the remaining 6 bits, which are the most significant bit (MSB) part, are input to the PWM generator 210.

그리고, 상기 2비트 전류 DAC(205)와, 상기 PWM 발생기(210)에 의해 OLED 패널(500)로 출력되는 전류, 즉 출력파형은 첨부 도면 도 5에 도시된 바와 같이 2비트 전류 DAC(205)의 출력 파형이 PWM 발생기(210)의 출력파형의 전단에 위치하며, 상기 PWM 발생기(210)의 출력파형의 4단계 진폭변조를 통해 0, 1/4, 2/4, 3/4 계조를 이룰 수 있도록 한다.In addition, the 2-bit current DAC 205 and the current outputted to the OLED panel 500 by the PWM generator 210, that is, the output waveform, are shown in FIG. 5. The output waveform of is located in front of the output waveform of the PWM generator 210, and achieves 0, 1/4, 2/4, 3/4 gradation through the four-step amplitude modulation of the output waveform of the PWM generator 210 To help.

그리고, 상기 PWM 발생기(210)에서 출력되는 펄스신호는 스위치부(220)의 각 스위치(PWM0~PWM(M-1))로 입력되며, 상기 스위치(PWM0~PWM(M-1))는 상기 펄스신호에 응하여 온/오프된다. 즉, 상기 PWM 발생기(210)는 상기 스위치(PWM0~PWM(M-1))를 접속 또는 차단시켜 펄스폭을 조절하게 된다.In addition, the pulse signal output from the PWM generator 210 is input to each switch (PWM0 to PWM (M-1)) of the switch unit 220, and the switches (PWM0 to PWM (M-1)) are the It is turned on / off in response to a pulse signal. That is, the PWM generator 210 adjusts the pulse width by connecting or disconnecting the switches PWM0 to PWM (M-1).

상기와 같이 PWM 발생기(210)를 이용하여 비선형 보정 과정을 수행하는 경우 비선형 특성을 완전하게 이룰 수 있으며, 특히 저 계조에서 비선형특성과 룩업 테이블 출력과의 편차를 최소화시켜 선명도는 향상시킬 수 있으나 최소 클럭 주파수가 4배 증가되어 소비전류가 4배로 증가하는 문제점이 있다.As described above, when the nonlinear correction process is performed using the PWM generator 210, nonlinear characteristics can be completely achieved. In particular, at low gray levels, the sharpness can be improved by minimizing the deviation between the nonlinear characteristics and the lookup table output. There is a problem that the clock frequency is increased four times, and the current consumption increases four times.

또한, PAM 방식의 경우 계조를 256단계로 확장할 경우 기존의 6비트 전류형 DAC를 8비트 전류형 DAC로 확장해야 하며, 이 경우 DAC의 해상도가 올라 갈수록 DAC 오차가 커질 뿐만 아니라 회로의 구성이 복잡해져 IC의 크기가 커진다는 문제점이 있다.In addition, in case of PAM system, if the gray scale is extended to 256 levels, the existing 6-bit current type DAC should be extended to 8-bit current type DAC. There is a problem that the complexity increases and the size of the IC increases.

본 발명은 상기와 같이 종래 기술의 문제점을 해결하기 위해 안출된 것으로서, 본 발명의 목적은 6비트 PWM 발생기에 오차가 낮은 2비트 전류형 DAC를 추가하여 6비트 PWM 발생기에 의해 펄스폭이 변조된 신호 후단에 2비트 전류형 DAC에 의해 펄스 크기가 변조된 신호가 출력되도록 하여 회로의 구성요소를 많이 늘이지 않고 256 계조를 적용시킬 수 있도록 하는 PM-OLED 디스플레이장치용 하이브리드 구동장치를 제공함에 있다.The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to add a 2-bit current-type DAC with a low error to the 6-bit PWM generator is pulse width modulated by the 6-bit PWM generator The present invention provides a hybrid drive device for a PM-OLED display device that allows a 256-gradation to be applied without greatly increasing the components of a circuit by outputting a signal whose pulse size is modulated by a 2-bit current type DAC at the rear of the signal. .

상기와 같은 기술적 과제를 해결하기 위하여 제안된 본 발명의 실시예는 PM-OLED 하이브리드 구동장치에 있어서, 8비트 데이터를 2비트 및 6비트씩 나누어 출력하는 드라이버 아이시 제어부; 상기 드라이버 아이시 제어부에서 출력되는 2비트 데이터 및 6비트 데이터를 입력받아 펄스폭이 변조된 신호에 대응하여 4 단계의 펄스 크기가 변조된 신호를 생성하고, 상기 생성된 신호에 의해 PM-OLED 패널이 구동되도록 하는 데이터 드라이버 아이시; 및 상기 드라이버 아이시 제어부에서 출력되 는 제어신호에 응하여 상기 OLED 패널로 스캔 데이터를 출력하는 스캔 드라이버로 이루어진 것을 특징으로 한다.In order to solve the above technical problem, an embodiment of the present invention provides a PM-OLED hybrid driving apparatus comprising: a driver IC controller for outputting 8-bit data divided by 2 bits and 6 bits; Receives 2-bit data and 6-bit data output from the driver Icy controller, and generates a signal in which the pulse size is modulated in four stages in response to a pulse-modulated signal, and generates the PM-OLED panel by the generated signal. Data driver for causing the drive to be driven; And a scan driver configured to output scan data to the OLED panel in response to a control signal output from the driver chassis controller.

상기와 같이 구성된 PM-OLED 디스플레이장치용 하이브리드 구동장치에 대해 첨부한 도면을 참조하여 설명하면 다음과 같다.Referring to the accompanying drawings, the hybrid drive device for the PM-OLED display device configured as described above is as follows.

PM-OLED 하이브리드 구동장치는, 첨부 도면 도 6에 도시된 바와 같이 8비트 데이터를 2비트 및 6비트씩 나누어 출력하는 드라이버 아이시 제어부(600)와, 상기 드라이버 아이시 제어부(600)에서 출력되는 8비트 데이터 및 2비트 데이터에 응하여 펄스폭이 변조된 신호에 대응하여 4 단계의 펄스 크기가 변조된 신호를 생성하고, 상기 생성된 신호에 의해 PM-OLED 패널(750)이 구동되도록 하는 데이터 드라이버 아이시(650)와, 상기 드라이버 아이시 제어부(600)에서 출력되는 제어신호에 응하여 상기 OLED 패널(750)로 스캔 데이터를 출력하는 스캔 드라이버(700)로 이루어진다.As shown in FIG. 6, the PM-OLED hybrid driving apparatus includes a driver IC controller 600 for dividing 8-bit data into 2 bits and 6 bits, and outputs from the driver IC controller 600. A data driver for generating a signal having a four-step pulse size modulated in response to a signal having a pulse width modulated in response to 8-bit data and 2-bit data, and driving the PM-OLED panel 750 by the generated signal. The IC 650 may include a scan driver 700 that outputs scan data to the OLED panel 750 in response to a control signal output from the driver IC controller 600.

상기 데이터 드라이버 아이시(650)는 상기 드라이버 아이시 제어부(600)로부터 출력되는 6비트 데이터를 입력받아 256단계의 출력펄스를 생성시켜 출력하는 PWM 발생기(651)와, 상기 PWM 발생기(651)에서 펄스폭변조 신호에 대하여 상기 드라이버 아이시 제어부(600)로부터 출력되는 2비트 데이터를 입력받아 4 단계의 펄스 크기가 변조된 신호가 출력되도록 하는 전류 DAC(652)와, 상기 전류 DAC(652)의 아날로그 신호에 응하여 2비트 구간의 전류 펄스 크기를 조절하는 전류원(653)과, 상기 PWM 발생기(651)로부터 출력되는 출력펄스에 따라 온/오프되는 스위치부(654) 와, 상기 스위치부(654)의 타단에 연결되는 리셋 스위치부(655)로 구성된다.The data driver IC 650 receives a 6-bit data output from the driver IC controller 600 and generates and outputs 256 output pulses in 256 steps, and the PWM generator 651. A current DAC 652 for receiving a 2-bit data output from the driver IC controller 600 with respect to a pulse width modulation signal and outputting a signal in which a pulse amplitude of four levels is modulated; A current source 653 for adjusting a current pulse amplitude in a 2-bit section in response to an analog signal, a switch unit 654 turned on / off according to an output pulse output from the PWM generator 651, and the switch unit 654 It is composed of a reset switch unit 655 connected to the other end of the.

상기와 같이 구성된 PM-OLED 하이브리드 구동장치의 작용에 대해 설명하면 다음과 같다.Referring to the operation of the PM-OLED hybrid drive device configured as described above are as follows.

먼저, 드라이버 아이시 제어부(600)는 8비트의 출력값을 상기 데이터 드라이버 아이시(650)의 PWM 발생기(651)와 2비트 전류 DAC(652)로 출력한다. 즉, 드라이버 아이시 제어부(600)는 상기 8비트 데이터 중 LSB(Least Significant Bit, 최하위 비트)부분인 2비트는 전류 DAC(652)로 입력되며, MSB(Most Significant Bit, 최상위 비트)부분인 나머지 6비트는 PWM 발생기(651)로 입력된다.First, the driver IC controller 600 outputs an 8-bit output value to the PWM generator 651 and the 2-bit current DAC 652 of the data driver IC 650. That is, the driver IC controller 600 inputs two bits, which are LSB (Least Significant Bit) of the 8-bit data, to the current DAC 652, and remains the MSB (Most Significant Bit) part. Six bits are input to the PWM generator 651.

그리고, 상기 PWM 발생기(651)와 상기 2비트 전류 DAC(652)에 의해 OLED 패널(750)로 출력되는 전류, 즉 출력파형은 첨부 도면 도 7에 도시된 바와 같이 먼저 PWM 발생기(651)의 출력파형의 전단에 위치하며, 상기 2비트 전류 DAC(652)의 출력 파형이 4단계로 펄스 크기가 변조되어 진폭변조를 통해 0, 1/4, 2/4, 3/4 계조를 이룰 수 있도록 한다.Then, the current output to the OLED panel 750 by the PWM generator 651 and the 2-bit current DAC 652, that is, the output waveform is first output of the PWM generator 651 as shown in FIG. 7. Located in front of the waveform, the output waveform of the 2-bit current DAC (652) is pulse-modulated in four steps to achieve 0, 1/4, 2/4, 3/4 gray scale through amplitude modulation .

그리고, 상기 PWM 발생기(651)에서 출력되는 펄스신호는 스위치부(654)의 각 스위치(PWM0~PWM(M-1))로 입력되며, 상기 스위치(PWM0~PWM(M-1))는 상기 펄스신호에 응하여 온/오프된다. 즉, 상기 PWM 발생기(651)는 상기 스위치(PWM0~PWM(M-1))를 접속 또는 차단시켜 펄스폭을 조절하게 된다. 즉, 첨부 도면 도 8에 도시된 바와 같이 데이터는 프리차지(pre-charge) 후 6비트 PWM 발생기(651)에 의해 펄스폭 변조신호, 2비트 DAC(652)에 의해 출력되는 펄스 크기 변조신호가 한 수평주기로 출력된다.In addition, the pulse signal output from the PWM generator 651 is input to each of the switches PWM0 to PWM (M-1) of the switch unit 654, and the switches PWM0 to PWM (M-1) are the It is turned on / off in response to a pulse signal. That is, the PWM generator 651 adjusts the pulse width by connecting or disconnecting the switches PWM0 to PWM (M-1). That is, as shown in FIG. 8, the data includes a pulse width modulated signal output by the 6-bit PWM generator 651 and a pulse size modulated signal output by the 2-bit DAC 652 after precharging. It is output in one horizontal cycle.

상기와 같이 PWM 발생기(651)를 이용하여 비선형 보정 과정을 수행하는 경우 비선형 특성을 완전하게 이룰 수 있어 선명도를 향상시킬 수 있다.As described above, when the nonlinear correction process is performed using the PWM generator 651, the nonlinear characteristic may be completely achieved, thereby improving the sharpness.

이에 따라 비선형 Gamma 특성과의 오차가 적게 되므로 첨부 도면 9에 도시된 바와 같이 OLED 패널에 표시되는 화면의 계조특성은 증가되어 화질의 향상을 가져오게 된다.Accordingly, since the error with the nonlinear Gamma characteristic is reduced, the gray scale characteristic of the screen displayed on the OLED panel is increased as shown in the accompanying drawing 9, resulting in an improvement in image quality.

상기와 같은 본 발명의 적용분야는 OLED용 패시브 매트릭스 구동회로 및 OLED용 패시브 매트릭스 드라이버 IC 등을 포함한다.The field of application of the present invention as described above includes a passive matrix driver circuit for OLED and a passive matrix driver IC for OLED.

이상의 본 발명은 상기 실시예들에 의해 한정되지 않고, 당업자에 의해 다양한 변형 및 변경을 가져올 수 있으며, 이는 첨부된 청구항에서 포함되는 본 발명의 취지와 범위에 포함된다.The present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art, which are included in the spirit and scope of the present invention included in the appended claims.

상기와 같은 구성 및 작용 그리고 바람직한 실시예를 가지는 본 발명에 의하면 6비트 PWM 발생기에 오차가 낮은 2비트 전류형 DAC를 추가하여 6비트 PWM 발생기에 의해 펄스폭이 변조된 신호 후단에 2비트 전류형 DAC에 의해 펄스 크기가 변조된 신호가 출력되도록 하여 회로의 구성요소를 많이 늘이지 않고 256 계조를 적용시킬 수 있도록 하여, 아이시 제조시 원가 상승이 거의 없어 저비용으로 고성능 드라이버 아이시 제조가 가능하도록 하는 효과가 있다.According to the present invention having the above-described configuration, operation, and preferred embodiment, the 2-bit current type DAC is added to the 6-bit PWM generator, and the 2-bit current type is formed at the rear of the signal whose pulse width is modulated by the 6-bit PWM generator. By outputting pulse-modulated signal by DAC, 256 gray levels can be applied without increasing circuit components. It is effective.

Claims (2)

PM-OLED 하이브리드 구동장치에 있어서, In the PM-OLED hybrid drive device, 8비트 데이터를 2비트 및 6비트씩 나누어 출력하는 드라이버 아이시 제어부; A driver IC controller for dividing 8-bit data into 2 bits and 6 bits and outputting the divided data; 상기 드라이버 아이시 제어부에서 출력되는 2비트 데이터 및 6비트 데이터를 입력받아 펄스폭이 변조된 신호에 대응하여 4 단계의 펄스 크기가 변조된 신호를 생성하고, 상기 생성된 신호에 의해 PM-OLED 패널이 구동되도록 하는 데이터 드라이버 아이시; 및 Receives 2-bit data and 6-bit data output from the driver Icy controller, and generates a signal in which the pulse size is modulated in four stages in response to a pulse-modulated signal, and generates the PM-OLED panel by the generated signal. Data driver for causing the drive to be driven; And 상기 드라이버 아이시 제어부에서 출력되는 제어신호에 응하여 상기 OLED 패널로 스캔 데이터를 출력하는 스캔 드라이버A scan driver for outputting scan data to the OLED panel in response to a control signal output from the driver IC controller 로 이루어진 것을 특징으로 하는 PM-OLED 하이브리드 구동장치.PM-OLED hybrid drive, characterized in that consisting of. 제 1 항에 있어서, 상기 데이터 드라이버 아이시는,The method of claim 1, wherein the data driver Icy, 상기 드라이버 아이시 제어부로부터 출력되는 6비트 데이터를 입력받아 256단계의 출력펄스를 생성시켜 출력하는 PWM 발생기와, A PWM generator that receives 6-bit data output from the driver Icy controller and generates and outputs 256 output pulses; 상기 PWM 발생기에서 펄스폭변조 신호에 대하여 상기 드라이버 아이시 제어부로부터 출력되는 2비트 데이터를 입력받아 4 단계의 펄스 크기가 변조된 신호가 출력되도록 하는 전류 DAC와, A current DAC that receives 2-bit data output from the driver IC controller for a pulse width modulated signal from the PWM generator and outputs a signal in which a pulse size of four levels is modulated; 상기 전류 DAC의 아날로그 신호에 응하여 2비트 구간의 전류 펄스 크기를 조 절하는 전류원과, A current source for adjusting a current pulse magnitude in a 2-bit section in response to an analog signal of the current DAC, 상기 PWM 발생기로부터 출력되는 출력펄스에 따라 온/오프되는 스위치부와, A switch unit turned on / off according to an output pulse output from the PWM generator, 상기 스위치부의 타단에 연결되는 리셋 스위치부Reset switch unit connected to the other end of the switch unit 로 구성되는 것을 특징으로 하는 PM-OLED 하이브리드 구동장치.PM-OLED hybrid drive, characterized in that consisting of.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788518A (en) * 2014-12-25 2016-07-20 昆山工研院新型平板显示技术中心有限公司 Method and device used for compensating non-uniform display of display device, and display device
GB2553075A (en) * 2016-03-21 2018-02-28 Oculus Vr Llc A display

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788518A (en) * 2014-12-25 2016-07-20 昆山工研院新型平板显示技术中心有限公司 Method and device used for compensating non-uniform display of display device, and display device
GB2553075A (en) * 2016-03-21 2018-02-28 Oculus Vr Llc A display
GB2553075B (en) * 2016-03-21 2019-12-25 Facebook Tech Llc A display
US11200831B2 (en) 2016-03-21 2021-12-14 Facebook Technologies, Llc Display using analog and digital subframes

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