# US 2008/0186335 A1 · Display driver ic having embedded dram

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- Number: US 2008/0186335 A1
- Document ID: US20080186335A1
- Status: Published application
- Kind: A1
- Application number: 11/971,926
- Filed: 2008-01-10
- Published: 2008-08-07
- Earliest claimed: 2007-02-06
- Assignees: NEC Electronics Corporation
- Inventors: Hiroyuki TAKAHASHI
- Web page: https://patentgrep.com/patent/US20080186335A1

## CPC

- G09G 5/39: Control of the bit-mapped memory
- G11C 11/4087: {Address decoders, e.g. bit - or word line decoders; Multiple line decoders}
- G09G 3/3688: {suitable for active matrices only}
- G09G 2360/128: Frame memory using a Synchronous Dynamic RAM [SDRAM]
- G11C 2207/104: Embedded memory devices, e.g. memories with a processing device on the same die or ASIC memory designs
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G11C: STATIC STORES (semiconductor memory devices H10B)

## Abstract

A display driver IC for controlling display of an image on a display panel is provided with a DRAM and a driver circuit. The DRAM has a plurality of memory cells and stores digital data corresponding to the image. The driver circuit converts the digital data into a gray-scale voltage and outputs the gray-scale voltage to the display panel. The DRAM is configured to store one bit data by using n memory cells of the plurality of memory cells, n being an integer of 2 or more.

## Claims

### Claim 1

A display driver IC for controlling display of an image on a display panel, comprising:
a DRAM having a plurality of memory cells and configured to store digital data corresponding to said image; and
a driver circuit configured to convert said digital data into a gray-scale voltage and to output said gray-scale voltage to said display panel,
wherein said DRAM stores one bit data by using n memory cells of said plurality of memory cells, n being an integer of 2 or more.

### Claim 2 (depends on 1)

The display driver IC according to claim 1,
wherein said n is two.

### Claim 3 (depends on 2)

The display driver IC according to claim 2,
wherein said two memory cells are connected to a pair of complementary bit lines, respectively, said complementary bit lines being connected to a same sense amplifier.

### Claim 4 (depends on 2)

The display driver IC according to claim 2,
wherein said two memory cells are connected to a same bit line.

### Claim 5 (depends on 1)

The display driver IC according to claim 1,
wherein in data writing and data reading, said DRAM simultaneously selects n word lines that are respectively connected to said n memory cells.

### Claim 6 (depends on 3)

The display driver IC according to claim 3,
wherein said two memory cells are connected to a same word line.

### Claim 7 (depends on 6)

The display driver IC according to claim 6,
wherein each of said two memory cells is a 6F2 cell.

### Claim 8 (depends on 6)

The display driver IC according to claim 6,
wherein in data writing and data reading, said DRAM selects only said same word line.