Image data control apparatus and display system

• US 5,903,253 A
• Filed: 12/23/1993
• Issued: 05/11/1999
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Inoue, Hiroshi, Mizutome, Atsushi, Yuki, Osamu
• Primary Examiner(s): Saras, Steven J.
• Assistant Examiner(s): Bell, Paul A.
• Application Number:
  US08/171,975
• Time in Patent Office: 1,965 Days
• Field of Search: 345/1, 345/3, 345/89, 345/97, 345/98, 345/99, 345/100, 345/103, 345/147, 345/148, 345/149, 345/150, 345/154, 345/152, 345/132, 345/213, 348/434, 348/478
• US Class Current: 345/694
• CPC Class Codes: G06F 3/1475 with conversion of CRT control signals to flat panel control signals, e.g. adapting the palette memory
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0464 Positioning
• CPC Class Codes: G09G 2360/02 Graphics controller able to handle multiple formats, e.g. input or output formats
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

An image data control apparatus comprises a first circuit to generate image data, a second circuit to discriminate a display mode from a main body side and a third circuit to convert the image data in accordance with the discriminated display mode.

Claims

1. An image data control apparatus, comprising:

first graphic control means, compatible with a CRT display system, for generating first image data specified by the CRT display system;

second graphic control means, separated from said first graphic control means, and having detecting means for detecting a resolution of the first image data of predetermined resolution including a luminance gradation data generated by said first graphic control means, for designating a number of constituent pairs of binary bits of a unit pixel forming a display unit, according to resolution detected by said detecting means, wherein each said unit pixel has a memory function and is driven independently, and including means for increasing the number of constituent Pairs of binary bits of a unit pixel;

means for converting the luminance gradation data in the first image data into an area gradation data, for generating the area gradation data of a gradation number designated according to the number of the constituent pairs designated, and for independently controlling the bits so that one binary state is selected per the binary bits of the designated constituent number;

means for operating said second graphic control means in accordance with a display mode of the first image data generated by said first graphic control means;

mode indicating means for indicating the display mode of said first graphic control means; and

means for controlling a common driver of a display panel so that, when an enlargement display is performed for a standard number of pixels of a resolution detected by said detecting means, the enlargement in a vertical direction is executed by scanning simultaneously plural scanning lines.

2. An apparatus according to claim 1, wherein the first image data is transferred synchronously with a horizontal sync signal and a vertical sync signal.

3. An apparatus according to claim 1, further comprising reading means for reading out color data from said first graphic control means, wherein said second graphic control means includes converting means for converting the color data in accordance with an indicated display mode.

4. An apparatus according to claim 3, wherein said converting means converts the color data into on/off data.

5. An apparatus according to claim 4, wherein the on/off data from said converting means is set in a period of time of a vertical sync signal or vertical blanking signal when the display mode is changed.

6. An apparatus according to claim 3, wherein the color data is transferred synchronously with a horizontal sync signal and a vertical sync signal.

7. A display system comprising:

a display panel having a driving circuit and an arrangement of a plurality of pixels, one of which comprises a plurality of bits driven independently of each other;

first graphic control means, compatible with a CRT display system, for generating first image data specified by the CRT display system;

second graphic control means, separated from said first graphic control means, and having detecting means for detecting a resolution of the first image data of predetermined resolution including a luminance gradation data generated by said first graphic control means, for designating a number of constituent pairs of binary bits of a unit pixel forming a display unit, according to resolution detected by said detecting means, wherein each said unit pixel has a memory function, and is driven independently, and including means for increasing the number of constituent pairs of binary bits of a unit pixel;

means for converting the luminance gradation data in the first image data into an area gradation data, for generating the area gradation data of a gradation number designated according to the number of the constituent pairs designated, and for independently controlling the bits so that one binary state is selected per the binary bits of the designated constituent number;

means for operating said second graphic control means in accordance with a display mode of the first image data generated by said first graphic control means;

mode indicating means for indicating the display mode of said first graphic control means; and

means for controlling a common driver of said display panel so that, when an enlargement display is performed for a standard number of pixels of a resolution detected by said detecting means, the enlargement in a vertical direction is executed by scanning simultaneously plural scanning lines.

8. A display system according to claim 7, wherein said display panel is a liquid crystal panel.

9. A display system according to claim 7, wherein said display panel is a ferroelectric liquid crystal panel.

10. A display system according to claim 7, wherein the first image data is transferred synchronously with a horizontal sync signal and a vertical sync signal.

11. A display system according to claim 7, further comprising reading means for reading out color data from said first graphic control means, wherein said second graphic control means includes converting means for converting color data in accordance with an indicated display mode.

12. A display system according to claim 11, wherein said converting means converts the color data into on/off data.

13. A display system according to claim 12, wherein the on/off data from said converting means is set in a period of time of a vertical sync signal or vertical blanking signal when the display mode is changed.

14. A display system according to claim 11, wherein the color data is transferred synchronously with a horizontal sync signal and a vertical sync signal.