Video display device

• US 6,476,779 B1
• Filed: 03/26/1999
• Issued: 11/05/2002
• Est. Priority Date: 03/31/1998
• Status: Expired due to Term

• Current Assignee: Saturn Licensing LLC (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Okamoto, Eizo, Yano, Motoyasu
• Primary Examiner(s): Saras, Steven
• Assistant Examiner(s): Anyaso, Uchendu O.
• Application Number:
  US09/277,706
• Time in Patent Office: 1,320 Days
• Field of Search: 348/799, 348/800, 348/803, 348/586, 345/148, 345/114, 345/22, 345/13, 345/1, 345/75, 345/87, 345/75.1, 345/213, 345/101, 345/103, 345/58, 345/745, 345/1.3
• US Class Current: 345/1.3
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• 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 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2360/12 Frame memory handling
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]

Abstract

A video display device is capable of performing a high-speed switching process and preventing video flicker from occurring. The video display device comprises a plurality of display units including a plurality of unit cells. The unit cell comprises a plurality of dots arranged vertically and horizontally each other and divided into a plurality of dot groups. Each dot is comprised of a plurality of display elements. Further, each unit cell is provided with a plurality of memories, a driving means and a switching means. The memories store the video data to be supplied to display elements. The driving means reads the video data corresponding to said dot groups stored in one of the memory and drives the display elements of said dot groups based on the read video data. The switching means switches alternately and successively the dot groups. The memories store the video data successively in a one-frame unit or a one-field unit. Since video signal written to the memory in a one-frame unit or one-field unit is read therefrom in the one-frame unit or the one-field unit, the dot groups may be switched at highs speed. Thereby, the video flicker maybe prevented from occurring.

Claims

1. A video display device comprising:

a display unit including a unit cell, said unit cell including a plurality of dot groups, each dot group having a plurality of dots, each dot having a plurality of display elements;

memory means for storing therein video data and current correction data;

driving means for reading the video data and the current correction data stored in said memory means and for driving display elements of said dot groups based on the read video data and the read current correction data; and

switching means for switching alternately and successively said dot groups;

wherein said memory means stores the video data as a one-frame unit or a one-field unit, and

wherein the current correction data is supplied from the outside along with the video data.

2. The video display device according to claim 1, wherein said dot groups comprise two dot groups and said switching means switches the two dot groups to shift alternatively said two dot groups.

3. The video display device according to claim 1,

wherein said dot comprises three display elements, each display element emitting light of red, green or blue.

4. The video display device according to claim 3,

wherein said dot groups are comprised of display elements emitting the same light-emitting color, said display element being driven successively and simultaneously every said dot groups.

5. The video display device according to claim 3,

wherein said dot comprises three display elements for emitting light-emitting color as a unit, and

wherein said switching means switches said three display elements successively and said driving means drives said display elements according to the switching of said dot groups.

6. The video display device according to claim 1,

wherein said memory means comprises two storing means, one of which stores therein the video data corresponding to one odd-numbered frame or field and the other of which stores therein the video data corresponding to one even-numbered frame or field.

7. The video display device according to claim 1,

wherein said display element comprises any of an organic light-emitting device, a light-emitting diode device, a discharge tube and a cathode ray tube.

8. The video display device according to claim 1,

wherein said video data is video data for a stereoscopic display.

9. The video display device according to claim 8,

wherein video data for the left eye and video data for the right eye are alternately read from the same memory means within the same frame cycle.