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EP0484969A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Panel display apparatus for characters and natural pictures

Assignee: Sharp Corp
•
Filing: 1991-11-08
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Granted: —
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Expires: 2011-11-08
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Abstract

Abstract A panel display apparatus includes a V-RAM (12), a display controller (13), a low-pass filter (17) and a panel display unit (16). Digital video signals read from the V-RAM (12) by the display controller (13) are input to the low-pass filter (17). Then, of the input digital video signals, high frequency components in spatial frequency characteristic thereof are removed, as required, by the low-pass filter (17) under control of the display controller (13) and the resulting digital video signals are fed to the panel display unit. Thus, satisfactory images are displayed on the panel display unit (16) under the control of the display controller (13) in accordance with the digital video signals from the low-pass filter (17) whether the images are characters and graphics or natural pictures. <IMAGE>

Inventors

  • 👤 Tai Shiraishi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 17:14
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/147; G06F3/1475; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G3/2007; G09G3/2011

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 106 words
A panel display apparatus in which an image is displayed on panel display means (16) under control of display control means (13) in accordance with digital video signals read from digital video signal storage means (12) by the display control means (13), comprising: filter means (17) for receiving the digital video signals read from the digital video signal storage means (12) by the display control means (13), and, under the control of the display control means (13), rejecting high frequency components in spatial frequency characteristic of the received digital video signals, as required, to feed the resulting digital video signals to the panel display means (16).
Claim 2
Dependent Claim 17 words
The panel display apparatus claimed in Claim 1, wherein the filter means is a smoothing circuit (17).
Claim 3
Dependent Claim 242 words
The panel display apparatus claimed in Claim 2, wherein the smoothing circuit comprises: a first flip-flop (31) which receives the digital video signals read from the digital video signal storage means (12) and is controlled by a clock signal outputted from the display control means (13); a first multiplexer (32) which receives both an output of the first flip-flop (31) and the digital video signals read from the digital video signal storage means (12) as input data signals, and is controlled by an enable signal outputted from the display control means (13) to determine which input data signal is selected; a first adder which (33) adds an output signal of the first multiplexer (32) and the digital video signals read from the digital video signal storage means (12); a second flip-flop (34) which receives an output signal of the first adder (33) and is controlled by the clock signal outputted from the display control means (13); a second multiplexer (35) which receives both an output signal of the second flip-flop (34) and the output signal of the first adder (33) as input data signals, and is controlled by the enable signal outputted from the display control means (13) to determine which input data signal is selected; and a second adder (36) which obtains and outputs an addition mean of an output signal of the second multiplexer (35) and the output signal of the first adder (33) to the panel display means (16).

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