Touch sensitive display device and method thereof

• US 8,305,340 B2
• Filed: 12/02/2010
• Issued: 11/06/2012
• Est. Priority Date: 10/26/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jong-Woung, Lee, Joo-Hyung, Uh, Kee-Han, Choi, Young-Jun, Cho, Man-Seung
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Edwards, Carolyn R
• Application Number:
  US12/959,333
• Publication Number:
  US 20110074722A1
• Time in Patent Office: 705 Days
• Field of Search: 345/104, 345170-178
• US Class Current: 345/104
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

The present invention relates to a touch sensitive display device, the display device including a display panel unit, a sensing unit formed on the display panel unit, receiving a sensor control signal, and generating a sensor data signal based on a touch exerted on the display panel unit, an output unit generating a sensing signal based on the sensor data signal from the sensing unit, and a compensation unit adjusting the sensor control signal such that the sensing signal is bounded in a predetermined range.

Claims

1. A display device comprising:

a display panel unit;

a sensing unit formed on the display panel unit, wherein the sensing unit comprises a sensing transistor for sensing light, and the sensing transistor comprises a control terminal which receives a sensing control voltage, an input terminal which receives a sensing input voltage and an output terminal which outputs a sensor data signal;

a sensing signal processor which receives the sensor data signal to generate a sensing signal and generates a feedback signal based on the sensing signal; and

a compensation unit which receives the feedback signal and adjusts at least one of the sensing control voltage and the sensing input voltage such that the sensing signal is bounded in a predetermined range,

wherein the adjusted at least one of the sensing control voltage and the sensing input voltage is inputted to at least one of the control terminal and the input terminal of the sensing transistor to detect a touch.

2. The display device of claim 1, wherein the compensation unit controls the sensing signal when the sensing signal is outside of the predetermined range.

3. The display device of claim 1, wherein the compensation unit operates based on an operating signal which is a difference between a target value and the feedback signal.

4. The display device of claim 3, wherein the compensation unit does not adjust the at least one of the sensing control voltage and the sensing input voltage when the target value is equal to the feedback signal.

5. The display device of claim 1, wherein the compensation unit performs one of proportional control, proportional-integral control, and proportional-integral-derivative control.

6. The display device of claim 1, wherein the compensation unit is implemented as an analog circuit or a digital circuit.