Cheng Ping Yu

US Patent:

8395715, Mar 12, 2013

Filed:

Dec 21, 2010

Appl. No.:

12/975284

Inventors:

Cheng Ho Yu - Cupertino CA, US
Ming Xu - Sunnyvale CA, US
Young-Bae Park - San Jose CA, US
Zhibing Ge - Sunnyvale CA, US
Daisuke Nozu - Kita, JP
Cheng Chen - San Jose CA, US
Abbas Jamshidi Roudbari - Sunnyvale CA, US
Shih Chang Chang - San Jose CA, US
Shawn R. Gettemy - San Jose CA, US

Assignee:

Apple Inc. - Cupertino CA

International Classification:

G02F 1/141
G02F 1/133

US Classification:

349 37, 349 33

Abstract:

Display ground plane structures may contain slits. Image pixel electrodes in the display may be arranged in rows and columns. Image pixels in the display may be controlled using gate lines that are associated with the rows and data lines that are associated with the columns. An electric field may be produced by each image pixel electrode that extends through a liquid crystal layer to an associated portion of the ground plane. The slits in the ground plane may have a slit width. Data lines may be located sufficiently below the ground plane and sufficiently out of alignment with the slits to minimize crosstalk from parasitic electric fields. A three-column inversion scheme may be used when driving data line signals into the display, so that pairs of pixels that straddle the slits are each driven with a common polarity. Gate line scanning patterns may be used that enhance display uniformity.

US Patent:

8648845, Feb 11, 2014

Filed:

May 24, 2011

Appl. No.:

13/143187

Inventors:

Shih Chang Chang - San Jose CA, US
Cheng Ho Yu - Cupertino CA, US
Zhibing Ge - Sunnyvale CA, US
Hopil Bae - Sunnyvale CA, US

Assignee:

Apple Inc. - Cupertino CA

International Classification:

G06F 3/038

US Classification:

345211, 345690, 345691

Abstract:

With respect to liquid crystal display inversion schemes, a large change in voltage on a data line can affect the voltages on adjacent data lines due to capacitive coupling between data lines. The resulting change in voltage on these adjacent data lines can give rise to visual artifacts in the data lines' corresponding sub-pixels. Various embodiments of the present disclosure serve to prevent or reduce persisting visual artifacts by offsetting their effects or by distributing their presence among different colored sub-pixels. In some embodiments, this may be accomplished by using different write sequences during the update of a row of pixels.

US Patent:

20110248949, Oct 13, 2011

Filed:

Apr 9, 2010

Appl. No.:

12/757896

Inventors:

Shih Chang Chang - Cupertino CA, US
Steven Porter Hotelling - San Jose CA, US
Cheng Ho Yu - Cupertino CA, US

International Classification:

G06F 3/045

US Classification:

345174

Abstract:

Reduction of the effects of differences in parasitic capacitances in touch screens is provided. A touch screen can include multiple display pixels with stackups that each include a first element and a second element. For example, the first element can be a common electrode, and the second element can be a data line. The display pixels can include a first display pixel including a third element connected to the first element, and the third element can contribute to a first parasitic capacitance between the first and second elements of the first display pixel, for example, by overlapping with the second element. The touch screen can also include a second display pixel lacking the third element. The second display pixel can include a second parasitic capacitance between the first and second elements of the second display pixel. The first and second parasitic capacitances can be substantially equal, for example.

US Patent:

20110267283, Nov 3, 2011

Filed:

Jul 23, 2010

Appl. No.:

12/842542

Inventors:

Shih Chang CHANG - San Jose CA, US
Hopil BAE - Sunnyvale CA, US
Cheng Ho YU - Cupertino CA, US
Zhibing GE - Sunnyvale CA, US

International Classification:

G06F 3/041

US Classification:

345173

Abstract:

Scanning gate lines in a gate driver system of a touch screen is provided. The gate driver system can include gate lines connected to display pixel transistors, a display driver that can generate first and second gate clock signals including first and second voltage transitions, respectively, and a gate drivers that can receive the first and second gate clock signals via gate clock lines and that can apply gate line signals, based on the gate clock signals, to the gate lines. A first voltage change generated in a common electrode line of the touch screen by the first voltage transition can be reduced by a second voltage change generated in the common electrode by the second voltage transition.

US Patent:

20120162121, Jun 28, 2012

Filed:

Dec 22, 2010

Appl. No.:

12/976909

Inventors:

Shih Chang Chang - San Jose CA, US
Hopil Bae - Sunnyvale CA, US
Cheng Ho Yu - Cupertino CA, US
Abbas Jamshidi Roudbari - Sunnyvale CA, US

International Classification:

G06F 3/045

US Classification:

345174

Abstract:

Setting a slew rate, e.g., a rising time or a falling time, of a scanning signal can be performed with a first operation, and a shunting resistance of the scanning line can be set with a second operation. A scanning system that scans a display screen, a touch screen, etc., can set a desired slew rate during a first period of time and can set a desired shunting resistance during a second period of time. A gate line system can sequentially scan gate lines to display an image during a display phase of a touch screen. The gate line system can, for example, increase the falling times of gate line signals. After the falling gate line signal has stabilized, for example, the gate line system can decrease the shunting resistance of the gate line.

US Patent:

20120313881, Dec 13, 2012

Filed:

Mar 3, 2011

Appl. No.:

13/126416

Inventors:

Zhibing Ge - Sunnyvale CA, US
Cheng Ho Yu - Cupertino CA, US
Young-Bae Park - San Jose CA, US
Abbas Jamshidi Roudbari - Sunnvale CA, US
Shih Chang Chang - San Jose CA, US
Cheng Chen - Cupertino CA, US
Marduke yousefpor - San Jose CA, US
John Zhong - Cupertino CA, US

International Classification:

G06F 3/044

US Classification:

345174

Abstract:

Electrical shield line systems are provided for openings in common electrodes near data lines of display and touch screens. Some displays, including touch screens, can include multiple common electrodes (Vcom) that can have openings between individual Vcoms. Some display screens can have an open slit between two adjacent edges of Vcom. Openings in Vcom can allow an electric field to extend from a data line through the Vcom layer. A shield can be disposed over the Vcom opening to help reduce or eliminate an electric field from affecting a pixel material, such as liquid crystal. The shield can be connected to a potential such that electric field is generated substantially between the shield and the data line to reduce or eliminate electric fields reaching the liquid crystal.