Two-level display device with hatching control means

• US 5,059,963 A
• Filed: 09/01/1988
• Issued: 10/22/1991
• Est. Priority Date: 01/12/1988
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Fukuoka, Hirofumi
• Primary Examiner(s): Weldon, Ulysses
• Assistant Examiner(s): FATAHI YAR, MAHMOUD
• Application Number:
  US07/239,435
• Time in Patent Office: 1,146 Days
• Field of Search: 340/783, 340/793, 340/701, 340/702, 340/703, 340/784, 340/767, 358/459
• US Class Current: 345/694
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: H04N 3/12 by switched stationary formation of lamps, photocells or light relays
• CPC Class Codes: H04N 3/127 using liquid crystals

Abstract

A display device of a type for displaying in two levels is so controlled as to display images of different colors by hatching according to different patterns such that images of different colors can be distinguished. In order to prevent distortion of image caused by hatching, hatching corresponding to any particular color can be selectively prevented. With a binary conversion circuit with adjustable reference voltages, an image with various combinations of analog color signals can also be displayed.

Claims

1. A display device for displaying an image in two levels, comprising:

pattern generation means for receiving red, green and blue color video signals and for generating hatching patterns of the two levels, corresponding individually to a plurality of colors represented by said color signals;

selection means for selecting one of said colors; and

inhibiting means, coupled to said pattern generation means and to said selection means, for inhibiting generation of said hatching pattern corresponding to the one selected color selected by said selection means and for generating a non-hatching pattern in one level of the two levels for said selected color instead of the inhibited hatching pattern.

2. The display device as claimed in claim 1, wherein said pattern generation means includes decoder means which has input terminals for receiving two-level red, green and blue color signals and is connected to a plurality of data selector means each capable of generating a hatching pattern representing a different color, said decoder means serving to activate a selected one of said data selector means depending upon signals received through said input terminals.

3. The display device as claimed in claim 2, wherein said inhibiting means includes switching means for selecting one of said data selector means to prevent said selected data selector means from generating a hatching pattern.