Touch Display Screen Common Electrode Segmentation for High Report Rate
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Solution Overview
Problem
Current In Cell touch display screens have a low report rate due to their time-division driving method, which limits the frequency of touch point information reporting and is costly and complex to manufacture.
Innovation Solution
The touch display screen incorporates strip-shaped common electrodes acting as touch driving electrodes, connected to a driving circuit that applies touch driving pulses and common voltage, allowing for extended touch driving pulse duration and increased report rate, while reducing the number of output signals from the driving chip and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If time-division driving is used to share common electrodes for both display and touch functions, then the structure can be simplified and cost reduced, but the report rate is limited to low values
Solution Approach 1:
The common electrodes are segmented into multiple independent touch driving electrodes, each capable of being driven independently. This allows parallel touch detection across different regions, increasing the report rate while maintaining the shared electrode structure for cost efficiency
Solution Approach 2:
Touch driving pulses are applied periodically to the segmented touch driving electrodes in a systematic sequence, enabling continuous touch detection across the display area. This periodic driving approach allows the system to maintain high report rate while using the same physical electrodes for both display and touch functions
2Illumination intensity
If time-division driving is used to prevent display effect from being affected by touch voltage changes, then display quality is maintained, but the touch detection period is very short
Solution Approach 1:
By segmenting the common electrodes into multiple touch driving electrodes, the touch detection function is distributed across multiple independent channels. This allows touch detection to occur systematically across different regions without interfering with the display function, extending the effective touch detection period
Solution Approach 2:
Touch driving pulses are applied in advance during the display period to prepare the liquid crystal molecules for touch detection. This preliminary action ensures that when touch detection occurs, the display quality is already established and not affected by voltage changes
3Adaptability or versatility
If Add-on touch screen structure is used, then touch function can be added, but the overall structure becomes thick and heavy
Solution Approach 1:
The touch screen structure is merged with the display screen structure by using the common electrodes of the display as touch driving electrodes. This integration eliminates the need for separate add-on touch screen layers, reducing overall thickness and weight while maintaining full touch functionality
Solution Approach 2:
The common electrodes serve dual purposes: as display common electrodes and as touch driving electrodes. This multi-functionality allows the same physical structure to provide both display and touch capabilities, eliminating the need for additional weight-bearing components
Data Source
AI summary
Embodiments disclose a touch display screen and a driving method thereof, which relates to a field of display, capable of decreasing a thickness of a panel and a width of the bezel and reducing a cost. The touch display screen according to the embodiments of the present disclosure comprises a color film substrate and an array substrate, wherein common electrodes, which has a shape of strip, are disposed on the color film substrate or the array substrate, one or more of the common electrodes act as a touch driving electrodes; the touch display screen further includes: a driving circuit, connected with the common electrodes acting as the touch driving electrodes, for applying touch driving pulses to the common electrodes acting as the touch driving electrodes and applying a common voltage in a period during which no touch driving pulse is applied.