Liquid crystal display and liquid crystal composition included therein
View Patent ↗Provided are a liquid crystal composition and a liquid crystal display (LCD) including the liquid crystal composition. The LCD includes 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. 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.
1. A liquid crystal display (LCD), comprising:
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,
a first gate line disposed on the first display panel;
a data line that crosses the first gate line;
a first subpixel electrode disposed on the first display panel and connected to the first gate line by a first switching element; and
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,
wherein the first subpixel electrode and the second subpixel electrode are bent in a zigzag manner,
wherein 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
wherein a rotational viscosity of the liquid crystal composition is 90 to 110 mPa·S.
2. The LCD of claim 1 , wherein the liquid crystal composition comprises 10 to 30 weight % of an alkenyl.
3. The LCD of claim 2 , further comprising:
a second gate line disposed on the first display panel, the data line crossing the second gate line;
a control switching element configured to be 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; and
a second control electrode, which overlaps the first control electrode to form a control capacitor, configured to receive a control voltage.
4. The LCD of claim 3 , wherein the first control electrode is made of indium tin oxide (ITO) or indium zinc oxide (IZO).
5. The LCD of claim 3 , wherein the control voltage is a common voltage.
6. The LCD of claim 3 , further comprising 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.
7. The LCD of claim 3 , wherein the second gate line is a gate line of an adjacent pixel.
8. The LCD of claim 1 ,
wherein storage wiring, which overlaps each of the first and second subpixel electrodes to form a capacitor, is omitted from the LCD.
9. The LCD of claim 8 , further comprising a slit between the first and second subpixels, the slit being at an angle of −45 to +45 degrees with respect to the first gate line.
10. A liquid crystal display (LCD), comprising:
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;
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 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 configured to be 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; and
a second control electrode, which overlaps the first control electrode to form a control capacitor, configured to receive a control voltage,
wherein 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∈/∈⊥ the dielectric anisotropy Δ∈ to the vertical dielectric constant ∈⊥ of the liquid crystal composition is 0.5 or less, and
wherein the first subpixel electrode and the second subpixel electrode are bent in a zigzag manner.