Driving circuit for driving a liquid crystal display panel

• US 8,477,110 B2
• Filed: 01/04/2011
• Issued: 07/02/2013
• Est. Priority Date: 01/04/2011
• Status: Expired due to Fees

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Chang, Yaw-Guang
• Primary Examiner(s): Bolotin, Dmitriy
• Application Number:
  US12/983,976
• Publication Number:
  US 20120169615A1
• Time in Patent Office: 910 Days
• Field of Search: 345173-178, 345/156, 178 1801- 1811
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

A sensing device for sensing a touch panel. The sensing device includes a touch sensor and a touch controller. The touch sensor senses touch events on the touch panel to generate raw data representing sensed values of the pixels on the touch panel, and further filters the raw data to generate filtered data. The data size of the filtered data is smaller than the data size of the raw data. The touch controller receives the filtered data from the touch sensor and processes the filtered data so as to determine positions of the touch events on the touch panel.

Claims

1. A sensing device for sensing a touch panel, comprising:

a touch sensor, for sensing a plurality of touch events on the touch panel to generate raw data representing a plurality of sensed values of a plurality of pixels on the touch panel, and further filtering the raw data to generate filtered data, wherein after filtering, the raw data of a portion of pixels on the touch panel is not remained in the filtered data so that the data size of the filtered data is smaller than the data size of the raw data; and

a touch controller, for receiving the filtered data from the touch sensor and processing the filtered data so as to determine positions of the touch events on the touch panel.

2. The sensing device as claimed in claim 1, wherein the touch sensor comprises:

a sensing element, for sensing the touch events to generate the sensed values;

an analog to digital converter (ADC), for converting the sensed values from an analog format to a digital format to generate the raw data; and

a signal processing unit, for processing the raw data and filtering out a portion of the raw data with the corresponding sensed values which are less than a predetermined threshold to obtain the filtered data.

3. The sensing device as claimed in claim 1, wherein the touch sensor and the touch controller are integrated as a single chip.

4. The sensing device as claimed in claim 1, wherein the touch sensor and the touch controller are individual chips.

5. The sensing device as claimed in claim 1, wherein the touch sensor further transfers the raw data of the corresponding sensed values at a plurality of border pixels of the touch panel to the touch controller.

6. A sensing module for sensing a touch panel, comprising:

a plurality of touch sensors, each for sensing a plurality of touch events on the touch panel and comprising;

a sensing element, sensing the touch events to generate a plurality of sensed values of a plurality of pixels on the touch panel;

an analog to digital converter (ADC), converting the sensed values from an analog format to a digital format to generate raw data representing the sensed values; and

a signal processing unit, processing the raw data and filtering out a portion of the raw data with the corresponding sensed values which are less than a predetermined threshold to obtain filtered data, wherein after filtering, the raw data of a portion of pixels on the touch panel is not remained in the filtered data so that the data size of the filtered data is smaller than the data size of the raw data.

7. The sensing module as claimed in claim 6, wherein one of the plurality of touch sensors further receives the filtered data from the other touch sensor(s), and processes the filtered data to determine positions of the touch events on the touch panel.

8. The sensing module as claimed in claim 7, wherein the other touch sensor(s) further transfers the raw data of the corresponding sensed values at a plurality of border pixels of the touch panel to the one of the plurality of touch sensors.

9. A sensing module for sensing a touch panel, comprising:

a plurality of touch sensors, each for sensing a plurality of touch events on the touch panel to generate raw data representing a plurality of sensed values of a plurality of pixels on the touch panel, and further filtering the raw data to generate filtered data,

wherein after filtering, the raw data of a portion of pixels on the touch panel is not remained in the filtered data so that the data size of the filtered data is smaller than the data size of the raw data, and

wherein one of the plurality of touch sensors further receives the filtered data from the other touch sensor(s), and processes the filtered data to determine positions of the touch events on the touch panel.

10. The sensing module as claimed in claim 9, wherein each of the plurality of touch sensors further comprises:

a sensing element, sensing the touch events to generate the sensed values;

an analog to digital converter (ADC), converting the sensed values from an analog format to a digital format to generate the raw data representing the sensed values; and

a signal processing unit, processing the raw data and filtering out a portion of the raw data with the corresponding sensed values which are less than a predetermined threshold to obtain the filtered data.