Display panel with alternating sub-pixel electrodes

• US 8,922,469 B2
• Filed: 10/14/2009
• Issued: 12/30/2014
• Est. Priority Date: 12/24/2008
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jung, Kwang-Chul, Chai, Chong-Chul, Jung, Mee-Hye
• Primary Examiner(s): Nguyen, Chanh
• Assistant Examiner(s): Kirkpatrick, John
• Application Number:
  US12/578,692
• Publication Number:
  US 20100156874A1
• Time in Patent Office: 1,903 Days
• Field of Search: 345/100, 345/92, 345/96, 345/211, 349/141, 349/48
• US Class Current: 345/92
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 2201/124 interdigital
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display panel includes a first sub-pixel electrode and a second sub-pixel electrode alternating with each other to form a horizontal electric field, a first data line transmitting a first data voltage to the first sub-pixel electrode, and a second data line transmitting a second data voltage to the second sub-pixel electrode, wherein the second sub-pixel electrode is formed to overlap the first and second data lines.

Claims

1. A display panel comprising:

a first sub-pixel electrode and a second sub-pixel electrode disposed directly on a same surface of a same layer that alternate with each other on said same surface to form a horizontal electric field;

a first data line transmitting a first data voltage to the first sub-pixel electrode; and

a second data line transmitting a second data voltage to the second sub-pixel electrode, wherein the second sub-pixel electrode overlaps the first and second data lines,

wherein the second sub-pixel electrode includes a plurality of second stripes that extend in parallel to and alternate with a plurality of first stripes of the first sub-pixel electrode, and

second connecting portions connecting the second stripes and partially overlapping the first and second data lines,

wherein said plurality of second stripes extend diagonal in a straight line to the second connecting portions, wherein each of the plurality of second stripes includes a first end connected to the second connecting portions, and an unconnected second end,

wherein an absolute value of the first data voltage is the same as that of the second data voltage, the first data voltage has a first polarity, and the second data voltage has a second polarity different from the first polarity, and

wherein in response to a change in the polarities of the first and second data voltages applied to the first and second data lines, the absolute value of a voltage variation of the second sub-pixel electrode based on a first parasitic capacitor between the first data line and the second sub-pixel electrode is the same with that of a voltage variation of the second sub-pixel electrode based on a second parasitic capacitor between the second data line and the second sub-pixel electrode.

2. The display panel of claim 1, wherein the first sub-pixel electrode is horizontally spaced apart from the first and second data lines.

3. The display panel of claim 1, wherein

an overlap area between the second sub-pixel electrode and the first data line is the same as

that between the second sub-pixel electrode and the second data line.

4. The display panel of claim 1, wherein a capacitance of the first parasitic capacitor is the same as that of the second parasitic capacitor.

5. The display panel of claim 1, further comprising a liquid crystal capacitor to which the first and second data voltages are applied.

6. The display panel of claim 1, wherein the plurality of first stripes of the first sub-pixel electrode extend in parallel with one another in a predetermined direction, and the first sub-pixel electrode includes first connecting portions connecting the first stripes.

7. The display panel of claim 1, wherein the second connecting portions of the second pixel electrode overlap the first data line and the second data line for substantially an entire length of the second pixel electrode.

8. A display panel comprising:

a first sub-pixel electrode and a second sub-pixel electrode disposed directly on a same surface of a same layer that alternate with each other on said same surface to form a horizontal electric field;

a first data line transmitting a first data voltage to the first sub-pixel electrode;

a second data line transmitting a second data voltage to the second sub-pixel electrode, wherein the second sub-pixel electrode overlaps the first and second data lines; and

a first switching device connecting the first sub-pixel electrode and the first data line and a second switching device connecting the second sub-pixel electrode and the second data line,

wherein the second sub-pixel electrode includes a plurality of second stripes that extend in parallel to and alternate with a plurality of first stripes of the first sub-pixel electrode, and second connecting portions connecting the second stripes and partially overlapping the first and second data lines,

wherein said plurality of second stripes extend diagonal in a straight line to the second connecting portions, wherein each of the plurality of second stripes includes a first end connected to the second connecting portions, and an unconnected second end,

wherein an absolute value of the first data voltage is the same as that of the second data voltage, the first data voltage has a first polarity, and the second data voltage has a second polarity different from the first polarity, and

wherein when the first and second switching devices are turned off and the polarities of the first and second data voltages are changed, there is no voltage variation between the first and second sub-pixel electrodes.

9. The display panel of claim 8, wherein an overlap area of the second sub-pixel electrode and the first data line is substantially the same as an overlap area of the second sub-pixel electrode and the second data line.