Source: http://www.google.com/patents/US8085233?dq=6106459
Timestamp: 2015-08-05 12:15:04
Document Index: 530584440

Matched Legal Cases: ['art 10', 'art 10', 'art 20', 'art 20', 'art 30', 'art 40', 'art 30', 'art 40']

Patent US8085233 - Pixel driving method, pixel driving circuit for performing the same, and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA pixel driving circuit includes a first gate line, a second gate line, a first data line, a second data line, a pixel part, a first driving part, a second driving part, and a first voltage-changing part. The first driving part applies a first data voltage to the first pixel electrode. The second driving...http://www.google.com/patents/US8085233?utm_source=gb-gplus-sharePatent US8085233 - Pixel driving method, pixel driving circuit for performing the same, and display apparatus having the pixel driving circuitAdvanced Patent SearchPublication numberUS8085233 B2Publication typeGrantApplication numberUS 12/412,185Publication dateDec 27, 2011Filing dateMar 26, 2009Priority dateMay 20, 2008Fee statusPaidAlso published asUS20090289887Publication number12412185, 412185, US 8085233 B2, US 8085233B2, US-B2-8085233, US8085233 B2, US8085233B2InventorsJian Gang Lu, Hong-Jo ParkOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (15), Referenced by (1), Classifications (7), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetPixel driving method, pixel driving circuit for performing the same, and display apparatus having the pixel driving circuit
US 8085233 B2Abstract
22. The display apparatus of claim 21, wherein the liquid crystal layer comprises a blue phase liquid crystal. Description
The first driving part 10 is connected to the first data line DL-a and the first pixel electrode 142 to apply the first data voltage to the first pixel electrode 142. The first driving part 10 may include a first driving transistor T1-a and a first driving capacitor C1-a. A gate electrode of the first driving transistor T1-a is connected to the first gate line GL1, and a source electrode of the first driving transistor T1-a is connected to the first data line DL-a. A drain electrode of the first driving transistor T1-a is connected to the first pixel electrode 142. Here, the first driving transistor T1-a is turned on when the first gate signal is applied to the first gate line GL1, so that the first data voltage may be applied to the first pixel electrode 142.
The second driving part 20 is connected to the second data line DL-b and the second pixel electrode 144 to apply the second data voltage to the second pixel electrode 144. The second driving part 20 may include a second driving transistor T1-b and a second driving capacitor C1-b. A gate electrode of the second driving transistor T1-b is connected to the first gate line GL1, and a source electrode of the second driving transistor T1-b is connected to the second data line DL-b. A drain electrode of the second driving transistor T1-b is connected to the second pixel electrode 144. Here, the second driving transistor T1-b is turned on when the first gate signal is applied to the first gate line GL1, so that the second data voltage may be applied to the second pixel electrode 144.
For example, the first voltage-changing part 30 may include a first voltage-supplying transistor T2-a, a first voltage-changing capacitor C2-a, a first voltage-storing transistor T3-a, a first voltage-storing capacitor C3-a, and a first voltage-changing transistor T4-a. A gate electrode of the first voltage-supplying transistor T2-a is connected to the first gate line GL1, and a source electrode of the first voltage-supplying transistor T2-a is connected to the second data line DL-b.
A first electrode of the first voltage-changing capacitor C2-a is connected to the first pixel electrode 142, and a second electrode of the first voltage-changing capacitor C2-a, which faces the first electrode, is connected to a drain electrode of the first voltage-supplying transistor T2-a. A gate electrode of the first voltage-storing transistor T3-a is connected to the first gate line GL1, and a source electrode of the first voltage-storing transistor T3-a is connected to the first data line DL-a.
A gate electrode of the first voltage-changing transistor T4-a is connected to the second gate line GL2, and a source electrode of the first voltage-changing transistor T4-a is connected to a first electrode of the first voltage-storing capacitor C3-a. A drain electrode of the first voltage-changing transistor T4-a is connected to a second electrode of the first voltage-changing capacitor C2-a. Hereinafter, a method of driving the pixel driving circuit of FIG. 2 will be described.
In this exemplary embodiment, the first data voltage may be a positive driving voltage Vd, and the second data voltage may be a negative driving voltage −Vd. When the first driving transistor T1-a is turned on, the positive driving voltage Vd is applied to the first pixel electrode 142. When the first voltage-supplying transistor T2-a is turned on, the negative driving voltage −Vd is applied to a second electrode of the first voltage-changing capacitor C2-a. When the first voltage-storing transistor T3-a is turned on, the positive driving voltage Vd is applied to a first electrode of the first voltage-storing capacitor C3-a. That is, when the first gate signal is applied to the first gate line GL1, a first pixel voltage V1 of the first pixel electrode 142 is the positive driving voltage Vd, a first charge voltage Vc1 of a second electrode of the first voltage-changing capacitor C2-a is the negative driving voltage −Vd, and a second charge voltage Vc2 of a first electrode of the first voltage-storing capacitor C3-a is the positive driving voltage Vd.
Moreover, when the first gate signal is applied to the first gate line GL1, a first electric charge amount Q1 is charged in the first driving capacitor C1-a, and a second electric charge amount Q2 is charged in the first voltage-changing capacitor C2-a. Moreover, a third electric charge amount Q3 is charged in the first voltage-storing capacitor C3-a. Here, when each of the first driving capacitors C1-a, the first voltage-changing capacitor C2-a and the first voltage-storing capacitor C3-a has a first capacitance C1, a second capacitance C2, and a third capacitance C3, respectively, the first, second, and third electric charge amounts Q1, Q2, and Q3 may be obtained by the following Equation 1.
Q1=C1�V1
Q2=C2�(V1−Vc1)
Q3=C3�Vc2 Equation 1
Q1′=C1�V1
Q2+=C2�(V1′−Vc1′)
Q3′=C3�Vc2′ Equation 2
The first dividing gate line GL-a extends along a first direction DI1. The first dividing gate line GL-a is connected to a gate electrode of the first driving transistor T1-a and a gate electrode of the second driving transistor T1-b. The second dividing gate line GL-b extends along the first direction DI1, and is disposed between the first dividing gate line GL-a and the second gate line GL2. For example, the second dividing gate line GL-b may be disposed along a center portion between the first dividing gate line GL-a and the second gate line GL2.
For example, the second voltage-changing part 40 may include a second voltage-supplying transistor T2-b, a second voltage-changing capacitor C2-b, a second voltage-storing transistor T3-b, a third voltage-storing capacitor C3-b, and a second voltage-changing transistor T4-b. A gate electrode of the second voltage-supplying transistor T2-b is connected to the first gate line GL1, and a source electrode of the second voltage-supplying transistor T2-b is connected to the first data line DL-a.
A first electrode of the second voltage-changing capacitor C2-b is connected to the second pixel electrode 144, and a second electrode of the second voltage-changing capacitor C2-b, which faces the first electrode, is connected to a drain electrode of the second voltage-supplying transistor T2-b. A gate electrode of the second voltage-storing transistor T3-b is connected to the first gate line GL1, and a source electrode of the second voltage-storing transistor T3-a is connected to the second data line DL-b.
A gate electrode of the second voltage-changing transistor T4-b is connected to the second gate line GL2, and a source electrode of the second voltage-changing transistor T4-b is connected to a first electrode of the second voltage-storing capacitor C3-b. A drain electrode of the second voltage-changing transistor T4-b is connected to a second electrode of the second voltage-changing capacitor C2-b. Hereinafter, a method of driving the pixel driving circuit of FIG. 7 will be described. Here, the driving method of the first voltage-changing part 30 is the same as the driving method as described in FIG. 3 and FIG. 4, so that a driving method of the second voltage-changing part 40 will be described.
In this exemplary embodiment, the first data voltage may be a positive driving voltage Vd, and the second data voltage may be a negative driving voltage −Vd. When the second driving transistor T1-b, the second voltage-supplying transistor T2-b, and the second voltage-storing transistor T3-b are turned on, the positive driving voltage Vd is applied to the second electrode of the second voltage-changing capacitor C2-b, and the negative driving voltage −Vd is applied to the second pixel electrode 144 and a first electrode of the second voltage-storing capacitor C3-b. That is, when the first gate signal is applied to the first gate line GL1, a second pixel voltage V2 of the second pixel electrode 144 is the negative driving voltage −Vd, a first charge voltage Vc1 of a second electrode of the second voltage-changing capacitor C2-b is the positive driving voltage Vd, and a second charge voltage Vc2 of a first electrode of the second voltage-storing capacitor C3-b is the negative driving voltage −Vd.
That is, when the first gate signal is applied to the first gate line GL1, a first electric charge amount Q1 is charged in the second driving capacitor C1-b, and a second electric charge amount Q2 is charged in the second voltage-changing capacitor C2-b. Moreover, a third electric charge amount Q3 is charged in the second voltage-storing capacitor C3-b. Here, when the second driving capacitors C1-b, the second voltage-changing capacitor C2-b and the second voltage-storing capacitor C3-b has a first capacitance C1, a second capacitance C2 and a third capacitance C3, respectively, the first, second, and third electric charge amounts Q1, Q2, and Q3 may be obtained by the following Equation 5.
Q1=C1�V2
Q2=C2�(V2−Vc1)
Q3=C3�Vc2 Equation 5
Q1′=C1�V2′
Q2′=C2�(V2′−Vc1′)
Q3′=C3�Vc2′ Equation 6
V1′−V2′=2(1+K)�Vd Equation 9
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