Common Electrode Block Segmentation for Touch Display Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch display panels with TDDI drivers face issues of slow recovery speed and discontinuous display quality due to high resistance paths for common electrodes, leading to abnormal display and power consumption inefficiencies.
Innovation Solution
Implementing a switch circuit that couples only the common electrode blocks corresponding to the display regions being displayed to a common voltage during the display period, while keeping the blocks corresponding to non-displayed regions in a floating state, thereby reducing the loading and power consumption of the common voltage generation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If all common electrode blocks are coupled to common voltage during display period, then display coverage is complete, but power consumption increases and recovery speed decreases
Solution Approach 1:
The common electrode plate is divided into multiple common electrode blocks (CB1-CBN), each independently controllable through separate switches (SW1-SWN). This segmentation allows selective coupling of only those blocks corresponding to currently displayed regions, reducing overall power consumption while maintaining adequate common voltage supply for active areas.
Solution Approach 2:
The system dynamically adjusts which common electrode blocks are coupled to common voltage based on the current display period requirements. Switches are controlled to connect only the necessary blocks during each display period, enabling the system to adapt its power consumption and recovery characteristics to the actual display needs.
2Reliability
If all common electrode blocks are coupled to common voltage, then display uniformity is maintained, but loading on common voltage generation circuit increases
Solution Approach 1:
The common electrode plate is divided into multiple common electrode blocks (CB1-CBN) that can be independently controlled. This segmentation reduces the total loading on the common voltage generation circuit by allowing only necessary blocks to be coupled during each display period, while switch circuits ensure uniform voltage distribution across active display regions.
3Use of energy by stationary object
If common electrodes are kept in floating state for non-displayed regions, then power consumption reduces, but display quality may become discontinuous
Solution Approach 1:
Different regions of the common electrode plate are treated differently based on their current display status. Blocks corresponding to actively displayed regions are coupled to common voltage to maintain display quality, while blocks for non-displayed regions are kept in floating state to reduce power consumption. This local differentiation resolves the contradiction between power savings and display continuity.
Data Source
AI summary
The present invention discloses a display panel and a display device. The display panel comprises a plurality of common electrode blocks and a plurality of display regions. During a display period, one or more common electrode blocks corresponding to one of the display regions which is to be displayed during the display period are coupled to a common voltage; and during the display period, one or more of the common electrode blocks corresponding to the display regions which are not to be displayed during the display period are kept in a floating state.