Liquid crystal display

Patent metadata

Field	Value
Publication number	US-9341896-B2
Application number	US-201213599414-A
Country	US
Kind code	B2
Filing date	Aug 30, 2012
Priority date	Jan 21, 2008
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A liquid crystal display (LCD) including a liquid crystal panel, and a gate driver which applies a gate signal having a driving frequency equal to or greater than 100 Hz to the liquid crystal panel. The liquid crystal panel comprises a first display panel, a second display panel facing the first display panel, and a liquid crystal composition disposed between the first display panel and the second display panel and includes liquid crystals.

First claim

What is claimed is:

1. A liquid crystal display (LCD) comprising:
a liquid crystal panel; and
a gate driver configured to apply a gate signal having a driving frequency equal to or greater than 100 Hz to the liquid crystal panel,
wherein:
the liquid crystal panel comprises:
a first display panel;
a second display panel facing the first display panel;
a liquid crystal composition disposed between the first display panel and the second display panel and includes liquid crystals;
a first gate line and a second gate line disposed on the first display panel;
a data line that crosses the first gate line and the second gate line;
a control line extending parallel to the first and second gate lines and disposed between the first and second gate lines;
a first subpixel electrode disposed on the first display panel and connected to the first gate line by a first switching element;
a second subpixel electrode disposed on the first display panel, spaced apart from the first subpixel electrode, and connected to the first gate line by a second switching element;
a control switching element that is switched on or off in response to a gate signal transmitted from the second gate line and is connected to the second subpixel electrode;
a first control electrode that is connected to the control switching element, the first control electrode being disposed in the same layer as the first and second subpixel electrodes, the first control electrode being separated from the first and second subpixel electrodes; and
a second control electrode which overlaps the first control electrode to form a control capacitor configured to receive a control voltage, the second control electrode branching off from the control line and being disposed in the same layer as the first and second gate lines;

if a dielectric constant in a direction parallel to a long axis of liquid crystals is defined as a horizontal dielectric constant ∈∥, a dielectric constant in a direction perpendicular to the long axis of the liquid crystals is defined as a vertical dielectric constant ∈⊥, and the difference between the vertical dielectric constant ∈⊥ and the horizontal dielectric constant ∈∥ is defined as dielectric anisotropy Δ∈, then a ratio Δ∈/∈⊥ of the dielectric anisotropy Δ∈ to the vertical dielectric constant ∈⊥ of the liquid crystal composition is 0.5 or less; and
the first subpixel electrode and the second subpixel electrode are bent in a zigzag manner.

2. The LCD of claim 1 , wherein the driving frequency is a multiple of 60 Hz.

3. The LCD of claim 1 , wherein a rotational viscosity of the liquid crystal composition is 90 to 100 mPa·S.

4. The LCD of claim 1 , wherein the liquid crystal composition includes 10 to 30 weight % of an alkenyl.

5. The LCD of claim 1 , wherein the first control electrode is made of indium tin oxide (ITO) or indium zinc oxide (IZO).

6. The LCD of claim 1 , wherein the control voltage is a common voltage.

7. The LCD of claim 1 , wherein the liquid crystal panel further comprises a black matrix disposed on the first display panel or the second display panel and overlapping the first control electrode and the second control electrode.

8. The LCD of claim 1 , wherein the second gate line is a gate line of an adjacent pixel.

9. The LCD of claim 1 , further comprising a slit arranged between the first subpixel electrode and the second subpixel electrode, the slit being at an angle of −45 to +45 degrees with respect to the gate line.

Assignees

• Kim Dong-Gyu
• Shin Kyoung-Ju
• Son Jong-Ho
• Lee Jun-Pyo
• Baek Seung-Soo
• Samsung Display Co Ltd

Inventors

• Kim Dong-Gyu
• Shin Kyoung-Ju
• Son Jong-Ho
• Lee Jun-Pyo
• Baek Seung-Soo

Classifications

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F2201/40

  Arrangements for improving the aperture ratio · CPC title

• G09G3/3659

  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 title

• C09K2019/0444

  characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group · CPC title

• G02F1/133707 Primary

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title