Driver for driving color-type display apparatus including small-sized partial image memory

• US 20060097974A1
• Filed: 11/08/2005
• Published: 05/11/2006
• Est. Priority Date: 11/08/2004
• Status: Abandoned Application

• Current Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Original Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Inventors: Hashimoto, Yoshiharu, Kumeta, Masayuki
• Application Number:
  US11/268,496
• Publication Number:
  US 20060097974A1
• Time in Patent Office: Days
• US Class Current: 345/98
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0613 The adjustment depending on the type of the information to be displayed
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• 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: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers
• CPC Class Codes: G09G 5/024 using colour registers, e.g. to control background, foreground, surface filling G09G5/06 takes precedence

Abstract

In a driver for driving a color-type display apparatus capable of displaying a partial display area of a display panel, where each pixel is formed by at least three color dots, a partial image memory is adapted to store video data for each pixel of the partial display area, and a color designating circuit is adapted to designate a color of letters of the partial display area designated by the video data.

Claims

1. A driver for driving a color-type display apparatus capable of displaying a partial display area of a display panel, where each pixel is formed by at least three color dots, comprising:

a partial image memory adapted to store video data for each pixel of said partial display area; and

a color designating circuit adapted to designate a color of letters of said partial display area designated by said video data.

2. The driver as set forth in claim 1, wherein said video data comprises 1-bit data.

3. The driver as set forth in claim 1, wherein said color designating circuit comprises:

a color setting register adapted to set the color of letters of said partial display area; and

a color selecting circuit adapted to select the color of letters of said partial display area in accordance with the color set in said color setting register when said video data shows letters of said partial display area.

4. The driver as set forth in claim 3, wherein said color setting register is further adapted to set a background color of said partial display area and a color of a non-display area of said display panel,

said color selecting circuit being further adapted to select the background color of said partial display area and the color of said non-display area in accordance with the colors set in said color setting register.

5. The driver as set forth in claim 4, wherein the background color of said partial display area is the same as that of said non-display area.

6. The driver as set forth in claim 5, wherein the background colors of said partial display area and said non-display area are one of white and black.

7. The driver as set forth in claim 4, wherein the color of letters of said partial display area, the background color of said partial display area and the color of said non-display area are different from each other.

8. The driver as set forth in claim 3, wherein said color setting register being adapted to set one color for every column of pixels of letters of said partial display area.

9. A driver for driving a color-type display apparatus capable of carrying out a partial displaying operation to display a partial display image of p rows×

q columns pixels in a display panel of m rows×

n columns pixels where p≦

m and q<

n, where each pixel is formed by at least three color dots, comprising;

a partial image memory adapted to store p x q×

1-bit video data for said partial display area; and

a color designating circuit adapted to designate a color of letters of said partial display area designated by said video data.

10. The driver as set forth in claim 9, wherein said color designating circuit comprises:

a color setting register adapted to set the color of letters of said partial display area; and

a color selecting circuit adapted to select the color of letters of said partial display area in accordance with the color set in said color setting register when said video data shows letters of said partial display area.

11. A driver for driving a color-type display apparatus including a display panel, where each pixel is formed by at least three color dots, comprising:

a partial display control section adapted to display a partial display area of said display panel;

an entire display control section adapted to display an entire display area of said display panel; and

a selector circuit connected to said partial display control section and said entire display control section and adapted to select one of said partial display control section and said entire display control section in accordance with a partial display signal,

said partial display control section comprising;

a partial image memory adapted to store video data for each pixel of said partial display area; and

a color designating circuit adapted to designate a color of letters of said partial display area designated by said video data.

12. The driver as set forth in claim 11, wherein said video data comprises 1-bit data.

13. The driver as set forth in claim 11, wherein said color designating circuit comprises:

a color setting register adapted to set the color of letters of said partial display area; and

a color selecting circuit adapted to select the color of letters of said partial display area in accordance with the color set in said color setting register when said video data shows letters of said partial display area.

14. The driver as set forth in claim 13, wherein said color setting register is further adapted to set a background color of said partial display area and a color of a non-display area of said display panel,

said color selecting circuit being further adapted to select the background color of said partial display area and the color of said non-display area in accordance with the colors set in said color setting register.

15. The driver as set forth in claim 14, wherein the background color of said partial display area is the same as that of said non-display area.

16. The driver as set forth in claim 15, wherein the background colors of said partial display area and said non-display area are one of white and black.

17. The driver as set forth in claim 14, wherein the color of letters of said partial display area, the background color of said partial display area and the color of said non-display area are different from each other.

18. The driver as set forth in claim 13, wherein said color setting register being adapted to set one color for every column of pixels of letters of said partial display area.

19. The driver as set forth in claim 11, wherein said entire display control section comprises:

a data register circuit adapted to sequentially latch multi-bit video signals;

a gradation voltage generating circuit adapted to generate two-gradation voltages or multi-gradation voltages in accordance with said partial display signal; and

a digital/analog converter adapted to convert said multi-bit video signals into analog video signals in accordance with said multi-gradation voltage.

20. The driver as set forth in claim 11, wherein said entire display control section comprises:

a gradation voltage generating circuit adapted to generate two-gradation voltages or multi-gradation voltages in accordance with said partial display signal;

a digital/analog converter adapted to convert multi-bit video signals into analog video signals in accordance with said multi-gradation voltage; and

a sample/hold circuit adapted to sequentially sample and hold said analog video signals.