DISPLAY DEVICE

• US 20140063389A1
• Filed: 11/09/2011
• Published: 03/06/2014
• Est. Priority Date: 05/25/2011
• Status: Abandoned Application

• Current Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Inventors: Matsumoto, Toshihisa
• Application Number:
  US14/114,828
• Publication Number:
  US 20140063389A1
• Time in Patent Office: Days
• US Class Current: 349/33
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G09G 2310/021 Double addressing, i.e. scanning two or more lines, e.g. lines 2 and 3; 4 and 5, at a time in a first field, followed by scanning two or more lines in another combination, e.g. lines 1 and 2; 3 and 4, in a second field
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 3/04 for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
• CPC Class Codes: G09G 3/3644 with the matrix divided into sections
• CPC Class Codes: G09G 3/3681 suitable for passive matrices only

Abstract

A display device including a display panel, further including one or more segment electrodes, a plurality of common electrodes, and pixels which are positioned at the intersections of these electrodes, and carrying out a display wherein drive voltages are applied to the pixels; first and second segment drivers, which drive the segment electrodes; and first and second common drivers which drive the common electrodes. The common electrodes are divided into at least first and second groups. Each common driver and each segment driver is respectively disposed corresponding to the first and second groups. The drive period of the first common driver and the drive period of the second common driver overlap at least partially.

Claims

1. A display device, comprising:

a display panel including one or a plurality of segment electrodes, a plurality of common electrodes, and pixels arranged at intersections of the electrodes, in which a drive voltage is applied to the pixels and a display is performed;

first and second segment drivers that drive the segment electrodes; and

first and second common drivers that drive the common electrodes,

wherein the common electrodes are divided into at least first and second groups,

the common drivers and the segment drivers are respectively arranged corresponding to the first and second groups, and

a driving period of the first common driver and a driving period of the second common driver are at least partially overlapped with each other.

2. The display device as set forth in claim 1,

wherein the display panel is a simple matrix liquid crystal display panel.

3. The display device as set forth in claim 2,

wherein the common electrodes are divided into the first and second groups only.

4. The display device as set forth in claim 2,

wherein the display panel has a plurality of segments that become display units, and one of the segments is constituted by pixels of 5×

7 dots, and

the common electrodes are divided into (i) a first group formed by four common electrodes, and (ii) a second group formed by three common electrodes.

5. The display device as set forth in claim 4,

wherein the first and second common drivers drive the respective common electrodes at an equal 1/4 duty,

driving of the first group of the common electrodes and the second group of the common electrodes starts at the same timing, and

for the second group of the common electrodes, a one-common-electrode portion of the driving period is made blank.

6. The display device as set forth in claim 2,

wherein the display panel has a plurality of segments that become display units,

a drive voltage is applied to one of the segments by m segment electrodes and n common electrodes, and

the n common electrodes are divided into (i) a first group driven by the first common driver and constituted by n/2 common electrodes and (ii) a second group driven by the second common driver and constituted by n/2 or (n/2−

1) common electrodes.

7. The display device as set forth in claim 6,

wherein a timing at which the first common driver starts driving with respect to the first group of the common electrodes and a timing at which the second common driver starts driving with respect to the second group of the common electrodes are substantially identical to each other.