METHOD OF AVOIDING MUTUAL INTERFERENCE OF TOUCH DETECTION WITH LCD SCAN

• US 20140176497A1
• Filed: 12/18/2013
• Published: 06/26/2014
• Est. Priority Date: 12/21/2012
• Status: Abandoned Application

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: Mo, Michael, Jiang, Xinxi, Liu, Junqiao
• Application Number:
  US14/133,116
• Publication Number:
  US 20140176497A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

A method of avoiding the mutual interference of touch detection with LCD scan, based on the LCD touch screen set with capacitive touch sensor. As to the said method, first of all, divide the entire LCD touch screen into at least two regions; then, set the touch detection timing sequence and LCD scan timing sequence for the LCD touch screen, enabling the touch detection process and LCD scan process to meet the condition of only conducting one process of touch detection process and LCD scan process within the same time period and same region, thus, enabling both of the touch detection process and LCD scan process to keep mutual independent running status either in time domain or in spatial domain. The invention has separated the touch detection process and LCD scan process from time domain and spatial domain, avoiding mutual interaction and mutual interference of the two processes.

Claims

1. A method of avoiding mutual interference of touch detection with LCD scan, based on LCD touch screen set with capacitive touch sensor;

the said LCD touch screen comprises LCD components and capacitive touch sensor components;

the said capacitive touch sensor components and the LCD components are mutually independent and laminated, set to be LCD touch screen, or the said capacitive touch sensor components are inserted between each layer in the LCD components by layers to form LCD touch screen, featuring that the said method comprises the following steps;

A. divide the whole LCD touch screen into at least two regions;

B. set touch detection timing sequence and LCD scan sequence of the LCD touch screen, enable the touch detection process and LCD scan process to meet a process of merely conducting touch detection process and LCD scan process within the same time interval and same region, thus, enabling touch detection process and LCD scan process to keep mutually independent running state either within time domain or spatial domain

2. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step B comprises the following sub-steps,

B11. set sequence of regions executing LCD scan process in the course of completing a frame of LCD scanning data, set sequence of regions executing touch detection process in the course of completing a frame of touch detection data, and ensure that regions executing LCD scan process do not coincidence with regions executing touch detection process within the same time period;

the said coincidence includes overlap and intersection.

3. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step A comprises the following sub-steps;

A21. separate the entire LCD touch screen into at least two touch detection regions seamlessly without overlapping each other;

A22. then, separate each touch detection region into at least two LCD scan regions seamlessly without overlapping each other;

then, Step B comprises the following sub-steps;

B21. set the sequence of LCD scan regions executing LCD scan process in the course of completing a frame of LCD scanning data;

B22. set the sequence of touch detection regions executing touch detection process in the course of completing a frame of touch detection data;

B23. facilitate the sequences stated in sub-step B21 and B22, ensure that LCD scan regions executing LCD scan process do not coincide with touch detection regions executing touch detection process within the same time period;

the said coincidence includes overlap and intersection.

4. The method of avoiding mutual interference of touch detection with LCD scan according to claim 3 is characterized in that:

the said Step B23 further comprises the following substeps,

B24. return to execute Substep B21 after the completion of each one cycle of touch detection process, namely after obtaining a frame of touch detection data;

B25. return to execute Substep B22 after the completion of each one cycle of LCD scan process, namely obtaining a frame of LCD scanning data.

5. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step B also comprises the following sub-steps,

B31. assign a touch detection sub-cycle for each region, thus, when touch detection process in all regions are completed, a complete touch detection cycle is completed, and a frame of touch detection data are obtained;

B32. assign an LCD sub-cycle for each region, thus when LCD scan process in all regions are completed, a complete LCD scan cycle is completed, and a frame of LCD scanning data are obtained;

B33. set either of the said LCD scan process or touch detection process to be master process, while the other process to be slave process;

then, the cycle corresponding to the master process shall be major cycle, the sub-cycle corresponding to the said master process shall be sub-cycle of the master process;

the cycle corresponding to the said slave process is slave cycle, the sub-cycle corresponding to the said slave process is the sub-cycle of the slave process;

execute the following Substep B34-B37 during each major cycle;

B34. judge whether the execution region of the master process corresponding to the sub-cycle of the master process to be executed coincides with the execution region of the slave process corresponding to the sub-cycle of the slave process to be executed or being executed, if so, execute Substep B35-B36, if not, execute Substep B37;

the said coincidence includes overlap and intersection;

B35. if sub-cycle of the slave process is being executed, discontinue the execution of the master process, after the sub-cycle of the slave process is completed, discontinue the slave process, start master process and complete the said sub-cycle of the master process to be executed, discontinue the master process after the completion of the sub-cycle of the master process;

return to Substep B34;

B36. if sub-cycle of the slave process is to be executed, discontinue the execution of the slave process, start the master process and complete the said sub-cycle of the master process to be executed, after the completion of the said sub-cycle of the master process, discontinue the master process, start the slave process;

return to Substep B34;

B37. execute the master process and the slave process simultaneously, after the master process has completed the said sub-cycle of the master process to be executed, return to Substep B34.

6. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step A comprises the following sub-steps,

A41. separate the entire LCD touch screen into at least two touch detection regions seamlessly without overlapping each other;

A42. then, separate each touch detection region into at least two LCD scan regions seamlessly without overlapping each other;

then, Step B comprises the following sub-steps,

B41. assign a touch detection cycle to each touch detection region, thus, when touch detection process in all touch detection regions are completed, an entire touch detection cycle is completed, and a frame of touch detection data are obtained;

B42. assign an LCD sub-cycle to each LCD scan region, thus, when LCD scan process in all LCD scan regions are completed, an entire LCD scan cycle is completed, and a frame of LCD scanning data are obtained;

B43. set either of the said LCD scan process or touch detection process to be master process, while the other process to be slave process;

then, the cycle corresponding to the master process shall be major cycle, the sub-cycle corresponding to the said master process shall be sub-cycle of the master process;

the cycle corresponding to the said slave process is slave cycle, the sub-cycle corresponding to the said slave process is the sub-cycle of the slave process;

execute the following Substep B44-B47 during the completion of one master cycle;

B44. judge whether the execution region of the master process corresponding to the sub-cycle of the master process to be executed coincides with the execution region of the slave process corresponding to the sub-cycle of the slave process to be executed or being executed, if so, execute Substep B45-B46, if not, execute Substep B47;

the said coincidence includes overlap and intersection;

B45. if sub-cycle of the slave process is being executed, discontinue the execution of the master process, after the sub-cycle of the slave process is completed, discontinue the slave process, start the master process and complete the said sub-cycle of the master process to be executed, discontinue the master process after the completion of the sub-cycle of the master process;

return to Substep B44;

B46. if sub-cycle of the slave process is to be executed, discontinue the execution of the slave process, start the master process and complete the said sub-cycle of the master process to be executed, after the completion of the said sub-cycle of the master process, discontinue the master process, start the slave process;

return to Substep B44;

B47. execute the master process and the slave process simultaneously, after the master process has completed the said sub-cycle of the master process to be executed, return to Substep B44.

7. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step A comprises the following sub-steps,

A51. separate the entire LCD touch screen into at least two LCD scan regions seamlessly without overlapping each other;

A52. then, separate each LCD scan region into at least two touch detection regions seamlessly without overlapping each other;

then, step B comprises the following sub-steps,

B51. set the sequence of LCD scan regions executing LCD scan process in the course of completing a frame of LCD scanning data;

B52. set the sequence of touch detection regions executing touch detection process in the course of completing a frame of touch detection data;

B53. facilitate the sequences stated in sub-step B51 and B22, ensure that LCD scan regions executing LCD scan process do not coincide with touch detection regions executing touch detection process within the same time period;

the said coincidence includes overlap and intersection.

8. The method of avoiding mutual interference of touch detection with LCD scan according to claim 7 is characterized in that:

the said Step B53 further comprises the following substeps,

B54. return to execute Substep B51 after the completion of each one cycle of LCD scan process, namely obtaining a frame of LCD scanning data.

B55. return to execute Substep B52 after the completion of each one cycle of touch detection process, namely after obtaining a frame of touch detection data.

9. The method of avoiding mutual interference of touch detection with LCD scan according to claim 1 is characterized in that:

the said Step A comprises the following sub-steps,

A61. separate the entire LCD touch screen into at least two LCD scan regions seamlessly without overlapping each other;

A62. then, separate each LCD scan region into at least two touch detection regions seamlessly without overlapping each other;

then, Step B comprises the following sub-steps,

B61. assign a touch detection sub-cycle to each touch detection region, thus, when touch detection process in all touch detection regions are completed, an entire touch detection cycle is completed, and a frame of touch detection data are obtained;

B62. assign an LCD sub-cycle to each LCD scan region, thus, when LCD scan process in all LCD scan regions are completed, an entire LCD scan cycle is completed, and a frame of LCD scanning data are obtained;

B63. set either of the said LCD scan process or touch detection process to be master process, while the other process to be slave process;

then, the cycle corresponding to the master process shall be major cycle, the sub-cycle corresponding to the said master process shall be sub-cycle of the master process;

the cycle corresponding to the said slave process is slave cycle, the sub-cycle corresponding to the said slave process is the sub-cycle of the slave process;

execute the following Substep B64-B67 during the completion of one master cycle;

B64. judge whether the execution region of the master process corresponding to the sub-cycle of the master process to be executed coincides with the execution region of the slave process corresponding to the sub-cycle of the slave process to be executed or being executed, if so, execute Substep B65-B66, if not, execute Substep B67;

the said coincidence includes overlap and intersection;

B65. if sub-cycle of the slave process is being executed, discontinue the execution of the master process, after the sub-cycle of the slave process is completed, discontinue the slave process, start the master process and complete the said sub-cycle of the master process to be executed, discontinue the master process after the completion of the sub-cycle of the master process;

return to Substep B64;

B66. if sub-cycle of the slave process is to be executed, discontinue the execution of the slave process, start the master process and complete the said sub-cycle of the master process to be executed, after the completion of the said sub-cycle of the master process, discontinue the master process, start the slave process;

return to Substep B64;

B67. execute the master process and the slave process simultaneously, after the master process has completed the said sub-cycle of the master process to be executed, return to Substep B64.