KR101009451B1 - System for embodiment high picture quality of pdp television using optical science sensor - Google Patents
System for embodiment high picture quality of pdp television using optical science sensor Download PDFInfo
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- KR101009451B1 KR101009451B1 KR1020040058033A KR20040058033A KR101009451B1 KR 101009451 B1 KR101009451 B1 KR 101009451B1 KR 1020040058033 A KR1020040058033 A KR 1020040058033A KR 20040058033 A KR20040058033 A KR 20040058033A KR 101009451 B1 KR101009451 B1 KR 101009451B1
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- G—PHYSICS
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- 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
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2033—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
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- 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
- G09G3/288—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 using AC panels
- G09G3/291—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
- G09G3/2946—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 using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield
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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
- G09G3/288—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 using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
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- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
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Abstract
본 발명은 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치에 관한 것으로, 특히 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 개선하기 위해 주변 밝기를 외부 광학센서를 이용하여 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수를 증감시켜 표현함으로써 어두운 외부 밝기 상태에서의 영상신호의 계조표현력을 증가시키는 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치에 관한 것이다. 이와 같은 본 발명은 입력되는 영상의 APL을 검출하기 위한 APL 검출기와; PDP TV 주변의 외부 밝기를 검출하기 위한 광학센서와; PDP를 구동하기 위한 PDP 구동부와; 입력영상의 APL과 PDP TV 주변의 외부 밝기 값에 따라 가변하는 PDP 구동에 필요한 서브필드 갯수와 각 서브필드 별 유지방전 시간 정보를 저장하고 있는 웨이트 테이블과; 상기 APL 검출기와 광학센서로 검출한 APL 및 PDP TV 주변의 외부 밝기 값에 따라 해당 웨이트 테이블을 선택하고, 상기 선택한 웨이트 테이블의 특성에 따라 서브필드 갯수와 유지방전 시간을 가변시켜 PDP 구동부를 제어하는 주제어부;를 포함하여 이루어진다.The present invention relates to a high-definition apparatus for realizing a PDP television using an optical sensor. In particular, the peripheral brightness is detected using an external optical sensor to improve the gray level display problem of a dark signal of a PDP TV appearing in a dark environment. In the case of dark surroundings, PDP televisions using an optical sensor increase the gray level expressing power of the image signal in the dark external brightness state by increasing or decreasing the number of subfields so that the gray level expression of the dark signal rather than the brightness of the screen can be expressed well. The present invention relates to a high definition device. The present invention as described above APL detector for detecting the APL of the input image; An optical sensor for detecting external brightness around the PDP TV; A PDP driver for driving the PDP; A weight table for storing the number of subfields required for driving the PDP and the sustain discharge time information for each subfield according to the APL of the input image and the external brightness value around the PDP TV; Selecting the corresponding weight table according to the external brightness values around the APL and PDP TV detected by the APL detector and the optical sensor, and controlling the PDP driver by varying the number of subfields and the sustain discharge time according to the characteristics of the selected weight table. A main control unit.
광학센서, PDP, APL 검출기, 입력영상, 계조표현력Optical sensor, PDP, APL detector, input image, gradation expression
Description
도 1 은 본 발명에 의한 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치의 구성을 설명하기 위한 블럭도.BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram for explaining a configuration of a high quality implementing apparatus of a PDP television using an optical sensor according to the present invention.
도 2 는 본 발명에 의한 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치의 동작을 설명하기 위한 흐름도.
2 is a flowchart for explaining the operation of the high-definition implementation apparatus of the PDP television using the optical sensor according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10 : 광학센서 20 : APL 검출기10: optical sensor 20: APL detector
30 : 주제어부 40 : PDP 구동부30: main controller 40: PDP drive unit
50 : 웨이트 테이블 60 : PDP
50: weight table 60: PDP
본 발명은 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치에 관한 것으로, 보다 상세하게는 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 개선하기 위해 주변 밝기를 외부 광학센서를 이용하여 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수를 증감시켜 표현함으로써 어두운 외부 밝기 상태에서의 영상신호의 계조표현력을 증가시키는 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치에 관한 것이다.The present invention relates to a high-definition implementation of a PDP television using an optical sensor. More particularly, the peripheral brightness is detected using an external optical sensor in order to improve the gray level display problem of a dark signal of a PDP TV that appears in a dark environment. On the basis of this, when the surroundings are dark, the number of subfields is increased and expressed so that the gray level expression of the dark signal rather than the brightness of the screen can be expressed. The present invention relates to an apparatus for realizing high definition of a PDP television.
일반적으로 PDP는 3전극 면방전(Surface Discharge)형의 플라즈마 디스플레이 패널로 그 방전 셀 구조는 전면판에 유지 전극(sustain electrode:'X')과 스캔 전극(scan electrode;'Y')이 배치되어 있으며, 배면판에 어드레스 전극(address electrode;'A')이 배치되어 있다. 이러한 구조를 갖는 3전극 면방전형의 PDP는 ADS(Adsress Display Separate Period)라는 구동 방식으로 구동되는데, ADS 구동 방식은 1개의 부필드(subfield)를 리셋(reset) 구간, 어드레스(address) 구간, 및 유지(sustain) 구간으로 나뉘며, 리셋 구간은 단계 1, 단계 2, 단계 3으로 이루어진다.In general, the PDP is a three-electrode surface discharge type plasma display panel. The discharge cell structure has a sustain electrode ('X') and a scan electrode ('Y') disposed on the front panel. The address electrode 'A' is disposed on the back plate. The three-electrode surface discharge type PDP having such a structure is driven by a drive method called Adsress Display Separate Period (ADS), which is configured to reset one subfield to a reset period, an address period, and It is divided into a maintenance section, and the reset section consists of steps 1, 2, and 3.
리셋 구간에서는 유지 전극(X)과 스캔 전극(Y)에 전면 지우기 및 쓰기 펄스를 번갈아 가하여 모든 셀에 일정한 벽 전하를 형성함으로써, 어드레스 구간의 어드레스 동작에 대비하게 된다. 이때, 리셋 구간에 가하는 펄스는 필요에 따라 스므드 라이징(Smooth Rising) 펄스를 사용하거나, 1개의 부프레임(subframe)마다 초기화(reset)펄스를 인가하는 방식이 아닌 2 내지 10개의 부프레임마다 초기화 펄스를 인가하는 방식을 사용할 수도 있다. In the reset period, the entire erase and write pulses are alternately applied to the sustain electrode X and the scan electrode Y to form a constant wall charge in all cells, thereby preparing for the address operation in the address period. At this time, the pulse applied to the reset period is initialized every 2 to 10 subframes, not using a smooth rising pulse or applying a reset pulse every subframe. It is also possible to use a method of applying a pulse.
그리고, 어드레스 구간에서는 온(on)시키고자 선택된 셀에 대한 어드레스 전극(A)과 스캔 전극(Y) 사이의 방전을 일으켜 해당 셀에 벽전하를 쌓아둔다. 그러면, 유지 구간에 유지 전극(X)과 스캔 전극(Y)에 유지 방전을 위한 동작 전압을 인가함으로써 해당 셀에 디스플레이를 위한 방전을 일으키게 되는 것이다. In the address period, a discharge is generated between the address electrode A and the scan electrode Y for the cell selected to be turned on, and wall charges are accumulated in the corresponding cell. Then, by applying the operating voltage for the sustain discharge to the sustain electrode (X) and the scan electrode (Y) in the sustain period, the discharge for the display in the cell.
이러한 방식을 이용하는 PDP 텔레비젼은 APL(Average Picture Level)값이 0%에 가까울수록 어두운 신호일 경우 유지방전개수를 많이 하여 충분한 밝기를 내고, 100%에 가까울수록 밝은 신호일 경우 그 밝기를 줄임으로써 소비전력을 감소시킨다. 즉, APL(Average Picture Level)에 따라 셋트의 밝기를 조절하는 것이다. 이때 PDP TV의 밝기의 한계를 극복하기 위하여 서브필드(Subfield)의 갯수를 제한하고(10~12S.F) 최대한 많은 수의 유지방전 갯수를 확보하는데, 이 방법의 장점은 밝은 화면 구현은 가능하지만 어두운 신호의 경우 계조표현력이 떨어지는 문제점이 있다. 특히 주변이 어두운 경우에는 어두운 신호의 계조표현력의 문제가 더욱 심하게 나타나는 문제점이 있었다.PDP TVs using this method can achieve sufficient brightness by increasing the number of sustained discharges in the dark signal when the APL (Average Picture Level) value is close to 0%, and decrease the brightness when the signal is brighter by 100%. Decrease. That is, the brightness of the set is adjusted according to the average picture level (APL). In this case, in order to overcome the limitations of the brightness of the PDP TV, the number of subfields is limited (10 ~ 12S.F) and the maximum number of sustain discharges is secured. The advantage of this method is that a bright screen can be realized. In the case of a dark signal, there is a problem in that the gray scale power falls. In particular, in the case of dark surroundings, there is a problem in that the problem of gray scale power of the dark signal is more severe.
이와 같이 PDP 화면의 밝기는 패널에 인가되는 유지방전 시간 또는 회수에 따라 결정되는데, 밝은 화면을 구현하기 위해서는 어두운 화면보다 더 많은 방전을 발생하여야 하기 때문에 방전 회수가 많아질수록 패널의 수명은 단축되며, 소비 전력 또한 급격하게 증가하는 문제점이 있었다.
As such, the brightness of the PDP screen is determined according to the number of discharge discharges applied to the panel.However, in order to realize a bright screen, more discharges must be generated than a dark screen. In addition, power consumption has also been rapidly increasing.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위해 창안된 것으로, 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 개선하기 위해 주변 밝기를 외부 광학센서를 이용하여 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수를 증감시켜 표현함으로써 어두운 외부 밝기 상태에서의 영상신호의 계조표현력을 증가시키는 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치를 제공하는데 그 목적이 있다.
The present invention was devised to solve the above-mentioned problems of the prior art, and to detect the ambient brightness using an external optical sensor in order to improve the gray level display problem of the dark signal of the PDP TV appearing in the dark surroundings, In the case of dark surroundings, PDP televisions using an optical sensor increase the gray level expressing power of the image signal in the dark external brightness state by increasing or decreasing the number of subfields so that the gray level expression of the dark signal rather than the brightness of the screen can be expressed well. The purpose is to provide a high quality implementation device.
상기와 같은 목적을 달성하기 위한 본 발명은 입력되는 영상의 APL을 검출하기 위한 APL 검출기와; PDP TV 주변의 외부 밝기를 검출하기 위한 광학센서와; PDP를 구동하기 위한 PDP 구동부와; 입력영상의 APL과 PDP TV 주변의 외부 밝기 값에 따라 가변하는 PDP 구동에 필요한 서브필드 갯수와 각 서브필드 별 유지방전 시간 정보를 저장하고 있는 웨이트 테이블과; 상기 APL 검출기와 광학센서로 검출한 APL 및 PDP TV 주변의 외부 밝기 값에 따라 해당 웨이트 테이블을 선택하고, 상기 선택한 웨이트 테이블의 특성에 따라 서브필드 갯수와 유지방전 시간을 가변시켜 PDP 구동부를 제어하는 주제어부;를 포함하여 이루어진다.The present invention for achieving the above object is an APL detector for detecting the APL of the input image; An optical sensor for detecting external brightness around the PDP TV; A PDP driver for driving the PDP; A weight table for storing the number of subfields required for driving the PDP and the sustain discharge time information for each subfield according to the APL of the input image and the external brightness value around the PDP TV; Selecting the corresponding weight table according to the external brightness values around the APL and PDP TV detected by the APL detector and the optical sensor, and controlling the PDP driver by varying the number of subfields and the sustain discharge time according to the characteristics of the selected weight table. A main control unit.
바람직하게는, 상기 웨이트 테이블은 입력영상의 APL과 PDP TV 주변의 외부 밝기 값에 대응되는 PDP 구동에 필요한 서브필드 수량과 각 서브필드 별 유지방전 시간의 특성을 저장하고 있는 것을 특징으로 한다. Preferably, the weight table stores the number of subfields required for driving the PDP corresponding to the APL of the input image and the external brightness value around the PDP TV and the characteristics of the sustain discharge time for each subfield.
그리고, 상기 주제어부는 광학센서에서 검출한 PDP TV 주변의 외부 밝기가 어두운 경우 서브필드의 갯수가 많으면서 유지방전 시간이 짧은 특성을 갖는 웨이트 테이블을 선택하고, 외부 밝기가 밝은 경우 서브필드의 갯수가 적으면서 유지방전 시간이 긴 특성을 갖는 웨이트 테이블을 선택하는 것을 특징으로 한다.In addition, the main control unit selects a weight table having a characteristic of short number of subfields and a short discharge discharge time when the external brightness around the PDP TV detected by the optical sensor is dark, and the number of subfields when the external brightness is bright. It is characterized by selecting a weight table having a small and long sustain discharge time characteristic.
이와 같이, 본 발명은 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 개선하기 위해 주변 밝기를 외부 광학센서를 이용하여 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수를 증감시켜 표현함으로써 어두운 외부 밝기 상태에서 영상신호의 계조표현력을 증가시킬 수 있는 것이다.As described above, the present invention detects the ambient brightness using an external optical sensor to improve the gradation problem of the dark signal of the PDP TV when the surroundings are dark. By increasing or decreasing the number of subfields so that the gray level expression can be expressed well, the gray level expression power of the image signal can be increased in a dark external brightness state.
이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.
도 1 은 본 발명에 의한 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치의 구성을 설명하기 위한 블럭도이다.1 is a block diagram for explaining the configuration of a high quality implementation of a PDP television using the optical sensor according to the present invention.
도 1에 도시한 바와 같이, 본 발명은 입력되는 영상의 APL을 검출하기 위한 APL 검출기(20)와, PDP TV 주변의 외부 밝기를 검출하기 위한 광학센서(10)와, PDP(60)를 구동하기 위한 PDP 구동부(40), 입력영상의 APL 값과 PDP TV 주변의 외부 밝기 값에 따라 가변하는 PDP 구동에 필요한 서브필드 갯수와 각 서브필드 별 유지방전 시간 정보를 저장하고 있는 웨이트 테이블(50)로 이루어진다.As shown in FIG. 1, the present invention drives an
그리고, 상기 APL 검출기(20)와 광학센서(10)로 검출한 APL 및 PDP TV 주변의 외부 밝기 값에 따라 해당 웨이트 테이블(50)을 선택하고, 상기 선택한 웨이트 테이블(50)의 특성에 따라 서브필드 갯수와 유지방전 시간을 가변시켜 PDP 구동부(40)를 제어하는 주제어부(30)로 구성된다.Then, the weight table 50 is selected according to the external brightness values around the APL and PDP TVs detected by the
상기 웨이트 테이블(50)은 입력영상의 APL과 PDP TV 주변의 외부 밝기 값에 대응되는 PDP 구동에 필요한 서브필드 수량과 각 서브필드 별 유지방전 시간의 특성을 저장하는데, 주제어부(30)가 외부의 밝기 값에 따라 서브필드의 수와 각 서브필드 별 유지방전의 갯수를 결정하는데 이용된다.The weight table 50 stores the number of subfields required for driving the PDP corresponding to the APL of the input image and the external brightness value around the PDP TV and the characteristics of the sustain discharge time for each subfield. It is used to determine the number of subfields and the number of sustain discharges for each subfield according to the brightness value of.
그리고, 상기 주제어부(30)는 마이컴으로 광학센서(10)에서 검출한 PDP TV 주변의 외부 밝기가 어두운 경우에는 서브필드의 갯수가 많으면서 유지방전 시간이 짧은 특성을 갖는 웨이트 테이블(50)을 선택하고, 외부 밝기가 밝은 경우에는 서브필드의 갯수가 적으면서 유지방전 시간이 긴 특성을 갖는 웨이트 테이블(50)을 선택하며, 상기 선택한 웨이트 테이블 특성으로 PDP 구동부(40)를 제어하여 PDP를 구현한다.In addition, when the external brightness around the PDP TV detected by the
도 2 는 본 발명에 의한 광학 센서를 이용한 PDP 텔레비전의 고화질 구현 장치의 동작을 설명하기 위한 흐름도이다.2 is a flowchart illustrating the operation of the high-definition implementation apparatus of the PDP television using the optical sensor according to the present invention.
도 2에 도시한 바와 같이, 먼저 광학센서(10)를 통해 PDP 텔레비전 주변의 외부환경 밝기 값과 APL 검출기(20)를 통해 입력되는 영상의 APL 값을 주제어부(30)인 마이컴에서 인식한다(S10).As shown in FIG. 2, first, the external sensor brightness value around the PDP television and the APL value of the image input through the
그러면, 상기 마이컴은 상기 광학센서(10)와 APL 검출기(20)를 통해 검출한 외부 밝기값 및 APL값에 따라 웨이트 테이블에서 해당하는 PDP 구동에 필요한 서브필드 갯수와 각 서브필드 별 유지방전 시간 특성을 선택한다(S20).
Then, the microcomputer determines the number of subfields required for driving the corresponding PDP in the weight table and the sustain discharge time characteristic for each subfield according to the external brightness value and the APL value detected by the
구체적으로 설명하면, PDP 텔레비전의 주변 외부밝기가 어두운 경우에는 서브필드 갯수가 많으면서 유지방전의 갯수가 적은 웨이트 테이블을 선택하여 어두운 영상신호의 계조표현력을 좋게하고, 반대로 주변 외부밝기가 밝은 경우에는 서브필드 갯수가 적으면서 유지방전의 갯수가 많은 웨이트 테이블을 선택하여 휘도를 좋게 하는 것이다.Specifically, when the ambient external brightness of the PDP television is dark, a weight table with a large number of subfields and a low number of sustain discharges is selected to improve gray level representation of dark image signals, and conversely, when the external external brightness is bright, It is to improve the brightness by selecting a weight table having a small number of sustain discharges while having a small number of subfields.
그리고 나서, 마이컴은 상기 선택한 웨이트 특성에 맞게 즉, 선택한 서브필드 갯수와 각 서브필드별 유지방전 갯수로 PDP 구동부를 제어하여 PDP를 구현함으로써 동작하는 것이다(S30).Then, the microcomputer operates by implementing the PDP by controlling the PDP driver according to the selected weight characteristic, that is, the number of selected subfields and the number of sustain discharges for each subfield (S30).
이와 같이, 본 발명은 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 광학센서를 통해 외부 주변 밝기를 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수 및 유지방전시간을 증감시켜 PDP를 구현하여 어두운 외부 밝기 상태에서 영상신호의 계조표현력을 좋게 하는 것이다.
As described above, the present invention detects the gray level problem of the dark signal of the PDP TV that appears in the dark surroundings by using an optical sensor, and based on this, the gray level expression of the dark signal rather than the brightness of the screen is displayed in the dark case. The PDP is implemented by increasing or decreasing the number of subfields and the sustain discharge time so as to be well expressed, thereby improving the gray scale representation of the image signal in a dark external brightness state.
상술한 바와 같이, 본 발명은 주변이 어두운 경우에 나타나는 PDP TV의 어두운 신호의 계조표현 문제를 개선하기 위해 주변 밝기를 외부 광학센서를 이용하여 검출하고 이를 근거로 주변이 어두운 경우에는 화면의 밝기보다는 어두운 신호의 계조표현이 잘 표현될 수 있도록 서브필드 개수를 증감시켜 표현함으로써 어두운 외부 밝기 상태에서 영상신호의 계조표현력을 증가시킬 수 있는 효과가 있다. As described above, the present invention detects the ambient brightness using an external optical sensor to improve the gradation problem of the dark signal of the PDP TV appearing in the dark surroundings, and based on this, the brightness of the screen is higher than the brightness of the screen. By increasing or decreasing the number of subfields so that the gray level expression of the dark signal can be well expressed, the gray level expressing power of the image signal can be increased in a dark external brightness state.
또한, 본 발명은 주변 외부밝기가 어두운 경우 계조표현력을 좋게 하기 위해 서브필드 갯수가 많으면서 유지방전의 갯수가 적은 웨이트 테이블을 선택하여 PDP를 구동하기 때문에 방전 회수가 적어져 패널의 수명이 연장되고, 소비전력 또한 절감할 수 있는 효과가 있다.
In addition, since the present invention selects a weight table having a large number of subfields and a small number of sustain discharges to drive the PDP in order to improve gray scale expression when the ambient external brightness is dark, the number of discharges is reduced, thereby extending the life of the panel. In addition, power consumption can also be reduced.
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| JPH0772825A (en) * | 1993-09-03 | 1995-03-17 | Fujitsu General Ltd | Pdp display device |
| JPH10207426A (en) * | 1997-01-21 | 1998-08-07 | Victor Co Of Japan Ltd | Method of driving plasma display panel display device and drive controller therefor |
| KR20000070660A (en) * | 1997-12-10 | 2000-11-25 | 마츠시타 덴끼 산교 가부시키가이샤 | Display Apparatus Capable Of Adjusting The Number Of Subframes To Brightness |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0772825A (en) * | 1993-09-03 | 1995-03-17 | Fujitsu General Ltd | Pdp display device |
| JPH10207426A (en) * | 1997-01-21 | 1998-08-07 | Victor Co Of Japan Ltd | Method of driving plasma display panel display device and drive controller therefor |
| KR20000070660A (en) * | 1997-12-10 | 2000-11-25 | 마츠시타 덴끼 산교 가부시키가이샤 | Display Apparatus Capable Of Adjusting The Number Of Subframes To Brightness |
| KR20020089529A (en) * | 1997-12-10 | 2002-11-29 | 마츠시타 덴끼 산교 가부시키가이샤 | Display apparatus capable of adjusting the number of subframes to brightness and method therefor |
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