EP0707305A2
Expired / Lapsed
EP
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Display mode detector, pixel clock synchroniser and interpolator for ferroelectric liquid crystal display
Assignee: Canon Inc
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Filing: 1995-10-11
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Granted: —
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Expires: 2015-10-11
Abstract
Abstract A display control apparatus for displaying an image by receiving an RGB video signal including an image signal and a synchronizing signal receives horizontal and vertical synchronizing signals in the RGB video signal, and detects the current display mode using a display mode detector. A pixel synchronizing clock signal is generated using a clock generator in correspondence with the detected display mode, and the RGB video signal is interpolated by an interpolation processing circuit in correspondence with the display mode and the display screen size of an FLCD panel. The interpolated video signal is subjected to image signal processing, and the processed video signal is displayed on the FLCD panel.
Inventors
- 👤 Masayuki c/o Canon Kabushiki Kaisha Sawada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:29
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007; G06T3/4092; G09; G09G; G09G5/00; G09G5/003; G09G5/005; H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/099; G09G2300/00; G09G2300/04; G09G2300/0404; G09G2300/0408; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0205; G09G2310/0224; G09G2310/04; G09G2320/00; G09G2320/02; G09G2320/0271; G09G2320/0276; G09G2340/00; G09G2340/04; G09G2340/0407; G09G2340/0414; G09G2340/0421; G09G2340/0464; G09G2340/0478; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G09G5/006; G09G5/008; G09G5/18
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
110 words
A display control apparatus for displaying an image by receiving a video signal including an image signal and a synchronizing signal, characterized by comprising: display mode detection means (15) for detecting a current display mode on the basis of the synchronizing signal in the video signal; clock signal generation means (14) for generating a pixel synchronizing clock signal in correspondence with the display mode detected by said display mode detection means; interpolation means (16) for interpolating the video signal in correspondence with the display mode and a display screen size of a display; and output means (3) for outputting the video signal interpolated by said interpolation means to the display.
Claim 2
Dependent Claim
108 words
The apparatus according to claim 1, characterized in that said clock signal generation means comprises a plurality of oscillation means (36 - 38) having different oscillation frequencies, selection means (42) for selecting one of clock signals output from said plurality of oscillation means in correspondence with the display mode, and outputting the clock signal selected by said selection means as the pixel synchronizing clock signal, and frequency division means (40) for frequency dividing the pixel synchronizing clock signal selected by said selection means, and outputs the pixel synchronizing clock signal by locking phases of the clock signal frequency-divided by said frequency division means and a horizontal synchronizing signal.
Claim 3
Dependent Claim
41 words
The apparatus according to claim 1, characterized in that said clock signal generation means determines a frequency of the pixel synchronizing clock signal in correspondence with the display screen size of the display and a size of the input video signal.
Claim 4
Dependent Claim
36 words
The apparatus according to claim 1, characterized by further comprising A/D conversion means (13) for converting the video signal into a digital signal by sampling the video signal in synchronism with the pixel synchronizing clock signal.
Claim 5
Dependent Claim
33 words
The apparatus according to claim 2, characterized in that said frequency division means changes a frequency-division ratio thereof in correspondence with a display position of an image to be displayed on the display.
Claim 6
Dependent Claim
30 words
The apparatus according to claim 2, characterized in that said frequency division means changes a frequency division ratio thereof in correspondence with a frequency of the pixel synchronizing clock signal.
Claim 7
Dependent Claim
21 words
The apparatus according to claim 2, characterized in that each of said plurality of oscillation means comprises a voltage controlled oscillator.
Claim 8
Dependent Claim
38 words
The apparatus according to claim 2, characterized in that said frequency division means changes a frequency-division ratio thereof in correspondence with the display mode detected by said display mode detection means or a manual operation by an operator.
Claim 9
Dependent Claim
22 words
The apparatus according to claim 1, characterized in that the display mode includes one of a VGA mode and an SVGA mode.
Claim 10
Dependent Claim
27 words
The apparatus according to claim 1, characterized by further comprising gamma correction means (19) for performing gamma correction of the video signal interpolated by said interpolation means.
Claim 11
Dependent Claim
29 words
The apparatus according to claim 10, characterized by further comprising halftone processing means (21) for performing a halftone processing for the video signal gamma-corrected by said gamma correction means.
Claim 12
Dependent Claim
19 words
The apparatus according to claim 1, characterized in that the display is a display using a ferroelectric liquid crystal.
Claim 13
Dependent Claim
40 words
The apparatus according to claim 12, characterized by further comprising scanning control means (22) for instructing a scanning line to be displayed of the display, and thereafter, outputting a video signal to be displayed on the line to the display.
Claim 14
Dependent Claim
109 words
A display device for displaying an image by receiving a video signal including an image signal and a synchronization signal, characterized by comprising: display mode detection means (15) for detecting a current display mode on the basis of the synchronizing signal in the video signal; clock signal generation means (14) for generating a pixel synchronizing clock signal in correspondence with the display mode detected by said display mode detection means; interpolation means (16) for interpolating the video signal in correspondence with the display mode and a display screen size of a display; and display means (41) for displaying the video signal interpolated by said interpolation means on a screen.
Claim 15
Dependent Claim
108 words
The device according to claim 14, characterized in that said clock signal generation means comprises a plurality of oscillation means (36 - 38) having different oscillation frequencies, selection means (42) for selecting one of clock signals output from said plurality of oscillation means in correspondence with the display mode, and outputting the clock signal selected by said selection means as the pixel synchronizing clock signal, and frequency-division means (40) for frequency dividing the pixel synchronizing clock signal selected by said selection means, and outputs the pixel synchronizing clock signal by locking phases of the clock signal frequency divided by said frequency division means and a horizontal synchronizing signal.
Claim 16
Dependent Claim
36 words
The device according to claim 14, characterized by further comprising A/D conversion means (13) for converting the video signal into a digital signal by sampling the video signal in synchronism with the pixel synchronization clock signal.
Claim 17
Dependent Claim
21 words
The device according to claim 15, characterized in that each of said plurality of oscillation means comprises a voltage controlled oscillator.
Claim 18
Dependent Claim
40 words
The device according to claim 15, characterized in that said frequency division means (40) changes a frequency division ratio thereof in correspondence with the display mode detected by said display mode detection means or a manual operation by an operator.
Claim 19
Dependent Claim
22 words
The device according to claim 14, characterized in that the display mode includes one of a VGA mode and an SVGA mode.
Claim 20
Dependent Claim
27 words
The device according to claim 14, characterized by further comprising gamma correction means (19) for performing gamma correction of the video signal interpolated by said interpolation means.
Claim 21
Dependent Claim
27 words
The device according to claim 20, characterized by further comprising halftone processing means for performing halftone processing for the video signal gamma-corrected by said gamma correction means.
Claim 22
Dependent Claim
21 words
The device according to claim 14, characterized in that said display device (41) is a display using a ferroelectric liquid crystal.
Claim 23
Dependent Claim
39 words
The device according to claim 22, characterized by further comprising scanning control means for instructing a scanning line to be displayed on the screen, and thereafter, outputting a video signal to be displayed on the line to the screen.
Claim 24
Dependent Claim
85 words
A display control method for a display device for displaying an image by receiving a video signal including an image signal and a synchronizing signal, characterized by comprising the steps of: detecting a current display mode on the basis of the synchronizing signal in the video signal; generating a pixel synchronizing clock signal in correspondence with the detected display mode; interpolating the video signal in correspondence with the display mode and a display screen size; and displaying the interpolated video signal on the display screen.
Claim 25
Dependent Claim
85 words
A display control method for displaying an image by receiving a video signal including an image signal and a synchronizing signal, characterized by comprising the steps of: detecting a current display mode on the basis of horizontal and vertical synchronizing signals in the video signal; generating a pixel synchronizing clock signal in correspondence with the detected display mode; interpolating the video signal in correspondence with the display mode and a display screen size of a display; and outputting the interpolated video signal to the display.
References Cited (Backward Citations)
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