KR20000019087A - Automatic gamma correcting apparatus of pdp tv - Google Patents

Automatic gamma correcting apparatus of pdp tv Download PDF

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Publication number
KR20000019087A
KR20000019087A KR1019980037012A KR19980037012A KR20000019087A KR 20000019087 A KR20000019087 A KR 20000019087A KR 1019980037012 A KR1019980037012 A KR 1019980037012A KR 19980037012 A KR19980037012 A KR 19980037012A KR 20000019087 A KR20000019087 A KR 20000019087A
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South Korea
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gamma
gamma correction
panel
characteristic
microcomputer
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KR1019980037012A
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Korean (ko)
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김남일
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구자홍
엘지전자 주식회사
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Priority to KR1019980037012A priority Critical patent/KR20000019087A/en
Publication of KR20000019087A publication Critical patent/KR20000019087A/en

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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
    • G09G3/28—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 luminous gas-discharge panels, e.g. plasma panels
    • G09G3/2803—Display of gradations
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: An automatic gamma correcting apparatus of a PDP TV is provided to be capable of being an exact gamma correction. CONSTITUTION: The automatic gamma correction apparatus comprises: a brightness measuring device (405) for measuring a brightness of an image displayed on a PDP panel to apply the measured value to a microcomputer (401), which converts the received brightness value into gamma characteristic data; a gamma correcting part (402) for interfacing with the microcomputer and addressing a field memory (407) to send a gamma correction output, wherein the field memory stores data as a gamma correction function table; and a PDP driving part (403) for receiving a corrected color signal from the gamma correcting part to drive the PDP panel.

Description

피디피 티브이의 자동감마 보정장치PDTV's Auto Gamma Correction Device

본 발명은 피디피 티브이의 자동감마 보정장치에 관한 것으로서, 피디피(PDP:Plasma Display Panel) 티브이에서 콘트라스트 및 계조특성을 좋게하여 화질을 향상시키기위해 피디피의 감마 특성에 따라 알지비(R.G.B.)신호의 선형특성을 가변하여 자동으로 감마를 정확히 보정하는 장치에 관한 것이다.The present invention relates to an automatic gamma correction apparatus for PDTV, and to improve the image quality by improving contrast and grayscale characteristics in PDDP (PDP) TV, the linearity of the RGB signal according to the gamma characteristics of PDPD The present invention relates to a device for automatically correcting gamma accurately by varying characteristics.

본 발명의 목적은 피디피 티브이의 제조시에 조정 작업상에서 패널의 감마특성을 완벽하게 보정하고 패널간의 감마특성편차에 의한 제품간 특성편차를 해소하여 화질을 개선하고 제품의 품질을 균등하게 하고자 하는데 목적이 있다.An object of the present invention is to completely correct the gamma characteristics of the panel in the adjustment operation during the manufacturing of PDTV, and to improve the image quality and equalize the quality of the product by eliminating the characteristic deviation between products due to the gamma characteristic deviation between panels. There is this.

도 1은 종래기술에 의한 피디피 티브이의 감마보정장치로서, 마이크로컴퓨터(101)의 제어를 받아 감마보정을 하여 보정된 원색신호를 출력하는 감마보정부(102)와; 상기 감마보정부(102)를 제어하는 마이크로컴퓨터(101)와; 상기 감마보정부(102)의 출력값을 인가받아 패널을 구동하는 피디피 구동부(103)와; 상기 피디피 구동부(103)의 제어에 따라 화상을 디스플레이하는 패널(104)과; 상기 패널(104)에 디스플레이된 화상의 휘도를 측정하는 휘도측정기(105)로 구성되어 있다.1 is a gamma correction device of PDTV according to the prior art, comprising: a gamma correction unit 102 outputting a corrected primary color signal under gamma correction under the control of a microcomputer 101; A microcomputer (101) for controlling the gamma correction unit (102); A PD driver 103 for driving the panel by receiving the output value of the gamma correction unit 102; A panel (104) for displaying an image under the control of the PD driver (103); And a luminance meter 105 for measuring the luminance of the image displayed on the panel 104.

이하 종래의 기술에 의한 피디피 티브이의 휘도제어장치에 대한 작용을 첨부한 도 1 내지 도 3을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, a detailed description will be given with reference to FIGS. 1 to 3 attached to an operation of a PDTV according to a related art.

종래의 기술에 의한 피디피 티브이의 감마보정장치는 도 1에 도시한 바와 같이 각각 분해능 8비트를 갖는 알지비(RGB)디지탈 신호를 마이크로컴퓨터(101)에 의해 제어를 받는 감마보정부(102)에 인가하면 감마보정부(102)에서 알지비(RGB)신호 각각이 패널의 감마특성에 따라 감마보정후에 피디피 구동부(103)를 거쳐 패널(104)에서 화상이 디스플레이된다.The gamma correction device of PDTV according to the related art is provided to the gamma correction unit 102 which is controlled by the microcomputer 101, as shown in FIG. When applied, the gamma correction unit 102 displays an image on the panel 104 via the PD driver 103 after gamma correction according to the gamma characteristics of the panel.

휘도측정기(105)는 감마보정된 신호가 패널(104)로 디스플레이될 때 감마특성을 정량적으로 측정하여 희망하는 감마특성과 실제의 감마특성을 비교하기위한 방법으로 사용된다.The luminance meter 105 is used as a method for quantitatively measuring gamma characteristics when the gamma corrected signal is displayed on the panel 104 and comparing the desired gamma characteristics with actual gamma characteristics.

알지비(RGB)각각의 신호레벨(0-255,8비트의 경우)은 도 2에서와 같이 일정시간간격으로 분할되어 각 구간에 대한 선형변환계수(k1~k5)를 마이크로컴퓨터(101)의 제어에 의해 감마보정부(102)에서 변환하여 도 2와 같이 알지비(RGB)각각의 신호레벨의 선형특성이 구간별로 변환되어 감마보정을 행하게 된다.Each signal level (in case of 0 to 255, 8 bits) of the RGB ratio is divided at regular time intervals as shown in FIG. 2 to convert the linear conversion coefficients k1 to k5 for each section of the By the control, the gamma correction unit 102 converts the linear characteristics of the signal levels of the RGB to each section as shown in FIG. 2 to perform gamma correction.

도 2에서는 종래의 기술에 의한 감마보정장치에 적용되는 구간별 변환계수에 의해 신호레벨변환으로 감마보정하는 특성을 보여준다.Figure 2 shows the characteristics of gamma correction by the signal level conversion by the conversion coefficient for each section applied to the gamma correction apparatus according to the prior art.

입력되는 알지비(RGB)신호는 마이크로컴퓨터(101)에 의해 제어되는 감마보정부(102)에 인가되어 미리 설정된 신호레벨구간별로 신호레벨의 증감 혹은 구간선형특성이 변횐된 신호가 패널구동부(103)로 출력되어 패널구동부(103)에서 이에 맞추어 패널(104)을 구동하여 감마보정된 화질을 패널(104)에 디스플레이하게 되며 신호레벨에 따른 휘도는 휘도측정기(105)로 측정하여 도 3에 도시한것처럼 희망하는 특성과 감마보정후 측정된 특성과의 차이를 비교한다.The input RGB signal is applied to the gamma correction unit 102 controlled by the microcomputer 101 so that the signal of the signal level increases or decreases or the line linear characteristic is changed for each preset signal level section. The panel driver 103 drives the panel 104 accordingly to display the gamma-corrected image quality on the panel 104. The luminance according to the signal level is measured by the luminance meter 105 and is shown in FIG. As such, compare the difference between the desired characteristic and the characteristic measured after gamma correction.

이후 희망하는 계조특성과 유사하게 하기위해 마이크로컴퓨터(101)의 제어에 의해 감마보정부(102)는 반복해서 감마특성계수를 조정하게 된다.Thereafter, the gamma correction unit 102 repeatedly adjusts the gamma characteristic coefficient under the control of the microcomputer 101 to be similar to the desired gray scale characteristic.

그러나 이러한 조정방법은 감마보정부(102)의 아이씨(IC)가 가지는 신호레벨구간의 한계성과 구간별 선형계수조정방법이 가지는 한계성으로 인해 희망하는 특성과 일치시키기는 어렵다.However, this adjustment method is difficult to match the desired characteristics due to the limitations of the signal level section of the IC of the gamma correction unit 102 and the limitations of the linear coefficient adjustment method for each section.

이러한 이유는 감마특성보정이 마이크로컴퓨터(101)에 의해 제어되기는 하지만 구간별 신호레벨증감이나 구간선형성을 변화시키는 접근방법에 의존하므로 희망하는 감마특성을 정확하게 얻기에는 한계가 있기 때문이다.This is because the gamma characteristic correction is controlled by the microcomputer 101, but there is a limit in obtaining the desired gamma characteristic accurately since it depends on the approach of changing the signal level increase or the interval linearity for each section.

따라서 종래의 기술에 의한 감마보정장치는 선명한 명암과 계조특성을 가지는 생동감있는 화질특성을 얻기 힘들며 또한 제품양산시 피디피 패널 등의 감마특성편차에 의해 발생하는 제품간의 계조특성편차를 극복하기위한 조정이 사실상 매우 힘들게 되어 있다. 따라서 본 발명의 목적은 정확한 감마보정이 가능하고 편차조정이 양호한 새로운 방식의 감마보정장치를 제공하고자 하는데 있다.Therefore, in the conventional gamma correction device, it is difficult to obtain a vivid image quality characteristic having clear contrast and gradation characteristics, and in order to overcome the gradation characteristic deviation between products caused by gamma characteristic deviations such as PD panels in production It's very hard. Accordingly, an object of the present invention is to provide a gamma correction device of a new method capable of accurate gamma correction and good deviation adjustment.

도 1은 종래의 기술에 의한 감마보정장치의 구성도.1 is a block diagram of a gamma correction device according to the prior art.

도 2는 종래의 기술에 의한 감마보정부의 특성 파형도.2 is a characteristic waveform diagram of a gamma correction unit according to the prior art.

도 3은 종래의 기술에 의한 휘도특성 파형도.3 is a waveform diagram of luminance characteristics according to the related art.

도 4는 본 발명에 의한 감마보정장치의 일실시 예시도.Figure 4 is an exemplary view of a gamma correction device according to the present invention.

도 5는 본 발명에 의한 입력신호 파형도.5 is a waveform diagram of an input signal according to the present invention;

도 6는 본 발명에 의한 감마보정부의 상세 구성도.6 is a detailed configuration diagram of the gamma correction unit according to the present invention.

도 7a∼도 7f는 본 발명에 의한 감마보정파형 특성도.7A to 7F are characteristic diagrams of gamma correction waveforms according to the present invention.

***도면의 주요 부분에 대한 부호의 설명****** Description of the symbols for the main parts of the drawings ***

101,401:마이크로컴퓨터 102,402:감마보정부101,401: Microcomputer 102,402: Gamma Bo government

103,403:피디피 구동부 104,404:패널103, 403: PD drive unit 104, 404: panel

105,405:휘도 측정기 406:인터페이스부105,405: luminance meter 406: interface unit

407:필드 메모리407: field memory

도 4는 본 발명에 의한 피디피 티브이의 자동감마보정장치의 구성을 보인것으로서,마이크로컴퓨터(401)의 제어를 받아 감마보정을 하여 보정된 원색신호를 출력하는 감마보정부(402)와;상기 감마보정부(402)와 상호 연결되어 감마보정에 필요한 데이터를 저장하는 필드메모리(407)와;상기 감마보정부(402)의 출력원색신호를 인가받아 패널을 구동하는 피디피 구동부(403)와; 상기 피디피 구동부(403)의 제어에 따라 화상을 디스플레이하는 패널(404)과; 상기 패널(404)에 디스플레이된 화상의 휘도를 측정하여 그값을 인터페이스부(406)에 송출하는 휘도측정기(405)와; 상기 마이크로컴퓨터(401) 및 휘도측정기 사이에 연결되어 현재의 감마특성값을 아이스퀘어씨(IIC)데이타로 변환하여 마이크로컴퓨터(401)에 인가하는 인터페이스부(406)로 구성한다.Figure 4 shows the configuration of the automatic gamma correction device of PDTV according to the present invention, the gamma correction unit 402 for outputting the corrected primary color signal under gamma correction under the control of the microcomputer 401; A field memory 407 interconnected with the correction unit 402 and storing data necessary for gamma correction; a PD drive unit 403 for receiving an output primary color signal of the gamma correction unit 402 to drive a panel; A panel (404) for displaying an image under the control of the PD driver (403); A luminance meter 405 which measures the luminance of the image displayed on the panel 404 and transmits the value to the interface unit 406; The interface unit 406 is connected between the microcomputer 401 and the luminance meter to convert the current gamma characteristic value into ice square (IIC) data and apply it to the microcomputer 401.

발명의 상세한 설명에 앞서 본 발명의 특징을 먼저 요약하면 다음과 같다.Prior to the detailed description of the invention, a summary of the features of the present invention is as follows.

본 발명의 제1특징은 일정한 시간동안 전 신호레벨범위(0~255)에 걸쳐 순차적으로 변화되는 신호를 입력함으로써 피디피 티브이의 감마특성을 측정하고, 이를 희망하는 감마특성과 비교 연산함으로써 희망하는 감마특성을 가지도록 하는 감마특성보정함수를 발생하고 이 보정함수를 입력신호에 적용하여 신호레벨을 변환하는 감마보정부(402)를 구성한다.The first feature of the present invention is to measure the gamma characteristics of PDTVs by inputting signals that are sequentially changed over the entire signal level range (0 to 255) for a certain period of time, and then compare the desired gamma characteristics with the desired gamma characteristics. A gamma correction unit 402 is formed which generates a gamma characteristic correction function to have a characteristic and applies the correction function to an input signal to convert the signal level.

본 발명의 제2특징은 피디피 티브이의 감마특성은 휘도측정기(405)로 측정된후 측정된 감마특성을 지피아이비(GPIB:General Purpose Interface Bus)의 통신수단에 의해 감마보정부(402)내의 보정함수발생부에 전달되고 발생된 보정함수는 아이스퀘어씨(IIC)버스에 의해 인터페이스부(406)와 상호 연결되어 있다.The second aspect of the present invention is that the gamma characteristic of PDTV is measured by the luminance meter 405 and then the measured gamma characteristic is corrected in the gamma correction unit 402 by a communication means of a GPIB (General Purpose Interface Bus). The correction function transferred to and generated by the function generator is interconnected with the interface unit 406 by an Isquare bus (IIC) bus.

본발명의 제3특징은 보정함수발생부에서는 희망감마특성과 측정된 감마특성을 각각 희망보정함수와 측정된 보정함수로 만들어 이의 차이를 다시 선형변환함수와 더하여 감마보정함수를 발생하도록 한다.According to a third aspect of the present invention, the correction function generator generates a desired gamma characteristic and a measured gamma characteristic as a desired correction function and a measured correction function, respectively, and adds the difference to the linear conversion function to generate a gamma correction function.

이하 본 발명에 의한 피디피 티브이의 자동 감마보정장치의 작용을 첨부한 도 4 내지 도 7을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to Figures 4 to 7 attached to the action of the automatic gamma correction device of PDTV according to the present invention will be described in detail.

피디피 티브이의 조정공정시에 일정한 시간(t0)동안 전 신호레벨범위(0~255)에 걸쳐 순차적으로 변화되는 입력신호로 사용하고, 패널(404)전면에 놓인 휘도측정기(405)에서 측정된 감마특성 데이터가 지피아이비(GPIB:계측기에서 주변기기와의 연결을 위해 주로 사용되는 데이터 포맷임)에 의해 인터페이스부(406)에 인가되면 인터페이스부(406)에서 지피아이비 데이터를 아이스스퀘어씨 데이터로 변환하여 마이크로컴퓨터(401)에 전달하게되고 마이크로컴퓨터(401)는 측정된 감마특성데이터를 감마보정부(402)에 인가한다.The gamma measured by the luminance meter 405 placed on the front of the panel 404 is used as an input signal that is sequentially changed over the entire signal level range (0 to 255) for a predetermined time t0 during the adjustment process of the PDTV. When the characteristic data is applied to the interface unit 406 by a GPIB (GPIB: a data format mainly used for connecting to a peripheral device in the instrument), the interface unit 406 converts the data into ice square C data. The microcomputer 401 transmits the measured gamma characteristic data to the gamma correction unit 402.

감마보정부(402)에서는 종래의 구간별 선형변환계수에 의한 변환방식이 아닌 보정함수발생 및 필드메모리 제어처리를 하는것으로서, 상기 마이크로컴퓨터(401)로부터 입력된 감마측정데이터와 기 표준화되어 저장되어 있는 감마특성변환함수와 비교하여 보정함수를 발생하며 보정함수표에 의해 필드메모리(407)에 저장된 데이터를 어드레스하여 감마보정된 신호를 피디피 구동부로 출력한다.The gamma correction unit 402 performs a correction function generation and a field memory control process instead of a conventional conversion method based on the linear conversion coefficient for each section, and is pre-standardized and stored with the gamma measurement data input from the microcomputer 401. A correction function is generated in comparison with the gamma characteristic conversion function. The data stored in the field memory 407 is addressed by the correction function table to output a gamma-corrected signal to the PD driver.

도 4의 감마보정부(402)의 세부구성도인 도 6과 특성곡선인 도 7을 참조하여 좀더 상세히 설명하면 다음과 같다.The detailed configuration diagram of the gamma correction unit 402 of FIG. 4 and the characteristic curve of FIG. 7 will be described in more detail as follows.

도 4의 입력신호에 의해 패널(404)에 나타나는 휘도변화특성을 휘도측정기(405)로 측정하면 도 7의(a)의 현재특성함수 Gp(x)가 얻어진다. 구해진 현재특성 함수 Gp(x)는 GPIB를 통해 인터페이스부(406)에서 아이스퀘어씨 데이터로 변환되어 마이크로컴퓨터(401)에 보내지면 마이크로컴퓨터(401)는 다시 감마보정부(402)로 이를 송출하게 된다.When the luminance change characteristic appearing on the panel 404 by the input signal of FIG. 4 is measured by the luminance meter 405, the present characteristic function Gp (x) of FIG. The obtained current characteristic function Gp (x) is converted into ice square data by the interface unit 406 through the GPIB and sent to the microcomputer 401. The microcomputer 401 transmits it to the gamma correction unit 402 again. do.

감마보정부(402)에서는 이미 표준화되어 이미 저장된 도 7의(b) 희망특성함수 D(x)와 정규화(0~255) 되어 측정된 도 7의(d) 정규특성함수 G(x)와의 차값인 도7의(e) 의 편차특성함수 F(x)(=D(x)-G(x))를 구하여 현재 감마특성과 희망하는 감마특성과의 편차를 구할수 있고, 이는 희망감마특성을 얻기위한 감마보정함수를 정확히 얻기위하여 사용된다.In the gamma correction unit 402, the difference between the desired characteristic function D (x) of FIG. 7 and the normalized characteristic function G (x) of FIG. Deviation characteristic function F (x) (= D (x) -G (x)) of Fig. 7 (e) can be obtained to determine the deviation between the current gamma characteristic and the desired gamma characteristic. Used to get the gamma correction function correctly.

이어서 도 7의(c) 선형특성함수 L(x)(=x)와 상기 편차특성함수 F(x)를 더하면 도 7f의 감마보정함수 T(x)(=F(x)+L(x))를 구할수 있다.Subsequently, the linear characteristic function L (x) (= x) of FIG. 7 (c) and the deviation characteristic function F (x) are added to the gamma correction function T (x) (= F (x) + L (x) of FIG. 7F. ) Can be obtained.

이렇게 하여 입력신호인 알지비(RGB) 각각의 신호레벨에 대응하는T(Rx,Gx,Bx)에 의해 감마보정된 R'x=T(Rx),G'x=T(Gx), B'x=T(Bx)를 출력함으로써 패널(404)에서 디스플레이되는 희망감마특성을 가지게 된다.In this way, gamma-corrected R'x = T (Rx), G'x = T (Gx), and B 'gamma-corrected by T (Rx, Gx, Bx) corresponding to the respective signal levels of the RGB ratio as the input signal. Outputting x = T (Bx) has the desired gamma characteristic displayed on the panel 404.

본 발명은 희망하는 표준화된 감마특성과 휘도측정기로 측정되는 감마특성과의 편차를 계산하여 감마보정 변환함수에 반영함으로써, 피디피 감마특성을 정확히 보정할수 있어 패널의 감마특성편차에 의한 제품편차를 극복하고 뛰어난 명암 및 계조특성을 가지는 생동감 넘치는 화질을 얻을수 있는 효과가 있다.The present invention calculates a deviation between a desired standardized gamma characteristic and a gamma characteristic measured by a luminance meter and reflects it in the gamma correction conversion function, thereby accurately correcting the PDP gamma characteristic, thereby overcoming the product deviation caused by the gamma characteristic deviation of the panel. And it has the effect of obtaining a vibrant image quality with excellent contrast and gradation characteristics.

Claims (1)

영상신호를 디스플레이하는 패널과 상기 패널을 구동하는 패널 구동부를 가지는 피디피 티브이에 있어서, 상기 패널 전면에 설치되어 휘도를 측정하여 그 값을 인터페이스부로 송출하는 휘도측정기와; 상기 휘도측정기로부터 입력된 휘도값을 아이스퀘어씨 데이터로 변환하여 마이크로컴퓨터에 인가하는 인터페이스부와; 상기 인터페이스부로부터 인가된 휘도측정데이타를 감마보정부로 출력하하는 마이크로컴퓨터와; 상기 마이크로컴퓨터로부터 출력된 감마특성데이터와 기 표준화되어 저장된 감마특성변환함수와의 비교를 통해 보정함수를 필드메모리에 송출하여 필드메모리 데이터를 어드레스 하는 감마보정부와; 상기 감마보정부의 제어에 따라 데이터를 송출하는 필드메모리로 구성한 것을 특징으로하는 피디피 티브이의 자동감마 보정장치.A PD having a panel for displaying an image signal and a panel driver for driving the panel, comprising: a luminance measuring device installed on the front surface of the panel to measure luminance and to transmit a value to an interface unit; An interface unit for converting a luminance value input from the luminance meter into ice square data and applying the same to a microcomputer; A microcomputer outputting the luminance measurement data applied from the interface unit to a gamma correction unit; A gamma correction unit for sending a correction function to the field memory by comparing the gamma characteristic data output from the microcomputer with a pre-standardized and stored gamma characteristic conversion function to address the field memory data; PD gamma automatic gamma correction device comprising a field memory for transmitting data under the control of the gamma correction unit.
KR1019980037012A 1998-09-08 1998-09-08 Automatic gamma correcting apparatus of pdp tv KR20000019087A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030090861A (en) * 2002-05-22 2003-12-01 엘지전자 주식회사 Apparatus and Method for controlling A Gamma data automatically
KR100447188B1 (en) * 2002-03-22 2004-09-04 엘지전자 주식회사 Gamma Correction Device of display device
KR100458446B1 (en) * 2002-11-25 2004-11-26 엘지전자 주식회사 Method for calibrating gamma of a display
US7324164B2 (en) 2003-12-29 2008-01-29 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
KR100918922B1 (en) * 2002-12-07 2009-09-28 엘지전자 주식회사 Hybrid Gamma Correction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100447188B1 (en) * 2002-03-22 2004-09-04 엘지전자 주식회사 Gamma Correction Device of display device
KR20030090861A (en) * 2002-05-22 2003-12-01 엘지전자 주식회사 Apparatus and Method for controlling A Gamma data automatically
KR100458446B1 (en) * 2002-11-25 2004-11-26 엘지전자 주식회사 Method for calibrating gamma of a display
KR100918922B1 (en) * 2002-12-07 2009-09-28 엘지전자 주식회사 Hybrid Gamma Correction
US7324164B2 (en) 2003-12-29 2008-01-29 Samsung Electronics Co., Ltd. Display apparatus and control method thereof

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