EP0471275A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Color display control apparatus for controlling display gray scale of each scanning frame or each plurality of dots
Assignee: Toshiba Corp
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Filing: 1991-08-06
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Granted: —
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Expires: 2011-08-06
Abstract
Abstract A panel controller (67) converts display data having 64 gray scale levels for a color CRT output from an RAMDAC (71) into display data having 57 gray scale levels to perform display driving of a color LCD. The panel display controller (67) has a function of generating 7 intermediate pseudo gray scales between the base frames of R, G, and B signals by a frame rate control method in the color LCD having 8 base gray scale levels of each of the R, G, and B signals to generate (180 K colors) display data having 57 gray scale levels and a function of generating 3 intermediate pseudo gray scales between the base gray scales of the signals by a dither method to generate (24K colors) display data having 39 gray scale levels. The selection of the frame rate control or the dither method and the selection of the 512-color, 180-K-color, or 24-K-color display are arbitrarily performed, or these selection operations are automatically performed in accordance with a display mode.
Inventors
- 👤 Hiroshi C/O Intellectual Property Div. Uchikoga
- 👤 Hiroki C/O Intellectual Property Div. Zenda
- 👤 Hajime C/O Intellectual Property Div. Shimamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G06; G06F; G06F3/00; G06F3/14; G06F3/147; G06F3/1475; G09G3/2007; G09G3/2018; G09G3/2022; G09G3/2025; G09G3/2044; G09G3/2051; G09G3/2055
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
A color panel display control system including a color panel display device (9) having a predetermined gray scale and a CRT controller (69) for outputting display data and a display timing signal, characterized by comprising: color panel display control means (67) for representing intermediate gray scales of the predetermined gray scale by changing a gray scale of an arbitrary dot on a scanning frame of said color panel to display the display data on said color panel display device.
Claim 2
Dependent Claim
66 words
A system according to claim 1, characterized in that said color panel display means (67) receives the display data from said CRT controller, changes a display gray scale of the arbitrary dot every scanning frame to represent intermediate gray scales of the predetermined gray scale for each plurality of scanning frames, thereby displaying the display data on said color panel display device (Figs. 5 and 8).
Claim 3
Dependent Claim
73 words
A system according to claim 1, characterized in that said color panel display control means receives the display data from said CRT controller, divides a frame into a predetermined number of matrices, and changes a display gray scale constituted by dots on the matrices to represent intermediate gray scales of the predetermined gray scale in units of matrices, thereby displaying the display data on said color panel display device (Figs. 6 and 8).
Claim 4
Dependent Claim
171 words
A system according to claim 1, characterized in that said color panel display control means includes a first display control function of receiving the display data from said CRT controller, changing a display gray scale of an arbitrary dot every scanning frame, and representing intermediate gray scales of the predetermined gray scale for each plurality of scanning frames to display the display data on said color panel display device (Figs. 5 and 8), and a second display control function of receiving the display data from said CRT controller, dividing a frame into predetermined number of matrices, and changing the display gray scale constituted by dots on the matrices to represent intermediate gray scales of the predetermined gray scale in units of matrices, thereby displaying the display data on said color panel display device (Figs. 6 and 8); and said color panel display means further includes means for selecting one of the first display control function and the second display control function of said color panel display means (SL1, SL2; Fig. 12).
Claim 5
Dependent Claim
30 words
A system according to claim 4, characterized in that said selecting means includes means for arbitrarily selecting one of the first display control function and the second display control function.
Claim 6
Dependent Claim
37 words
A system according to claim 4, characterized in that said selecting means includes means for automatically selecting one of the first display control function and the second display control function in accordance with a display frame mode.
Claim 7
Dependent Claim
225 words
A color panel display control system including a color panel display device having a first gray scale and a CRT controller for outputting display data and a display timing signal, characterized by comprising: color panel display control means having a first display control function (Fig. 5) of receiving the display data from said CRT controller, changing a display gray scale of an arbitrary dot every scanning frame, and representing intermediate gray scales of the predetermined display gray scale for each plurality of scanning frames, thereby displaying the display data from said color panel display device, and a second display control function (Fig. 6) of receiving the display data from said CRT controller, dividing a frame into a predetermined number of matrices, and changing a display gray scale constituted by dots on the matrices to represent intermediate gray scales of the predetermined gray scale in units of matrices, thereby displaying the display data on said color panel display device, first generating means (81, 83, 95, 87) for generating first display color data in the predetermined gray scale, second generating means (81, 83, 93, 85, 95, 97, 87) for generating second display color data using one of the first display control function and the second display control function, and switching means (SL1, SL2; Fig. 12) for performing a switching operation between said first and second generating means.
Claim 8
Dependent Claim
28 words
A system according to claim 7, characterized in that said switching means includes means for arbitrary selecting one of said first generating means and said second generating means.
Claim 9
Dependent Claim
34 words
A system according to claim 7, characterized in that said switching means includes means for automatically selecting one of said first generating means and second generating means in accordance with a display frame mode.
Claim 10
Independent Claim
29 words
A system according to any one of claims 1 through 9, characterized in that said color panel display control means includes means for scanning a scanning frame odd-numbered times.
References Cited (Backward Citations)
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