Display Data Line Precharging at Touch-Display Boundary
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Solution Overview
Problem
Display devices experience line dim issues due to charging shortages at the boundary between the touch screen and display sections, leading to instability in data voltage and visibility.
Innovation Solution
Precharging data lines to a predetermined voltage during the transition period between touch screen and display panel driving periods, with the gate lines inactivated, to stabilize the common voltage and prevent line dim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines maintain ground voltage during touch section, then touch sensing can be performed, but line dim is generated at boundary due to large data value change
Solution Approach 1:
The patent applies preliminary action by precharging the data lines to a predetermined voltage during a first duration at the end of the touch screen driving period, before the display panel driving period begins. This advance charging prevents the large voltage change that would otherwise occur at the boundary, eliminating the line dim effect while maintaining proper touch sensing functionality during the touch period.
2Productivity
If data voltage is applied immediately at boundary, then display driving can start, but charging shortage causes line dim
Solution Approach 1:
The patent performs the charging action in advance during a first duration at the end of the touch screen driving period, so that when the display panel driving period begins, the data lines are already charged to the required voltage level. This eliminates charging shortage and prevents line dim without delaying the start of display driving.
Solution Approach 2:
The patent applies beforehand cushioning by precharging the data lines during a transition period, creating a voltage buffer that cushions against the potential voltage drop or charging shortage that would occur at the boundary between touch and display periods. This ensures stable voltage supply for high-quality display output.
3Productivity
If gate lines are activated immediately, then display refresh is maintained, but voltage instability occurs during transition
Solution Approach 1:
The patent applies preliminary action by precharging the data lines during a first duration at the end of the touch screen driving period, before the display panel driving period begins. This advance charging ensures voltage stability when gate lines are subsequently activated, preventing voltage fluctuations during the transition while maintaining the display refresh schedule.
Data Source
AI summary
Disclosed is a display device including: a display panel including data lines and gate lines; a touch screen including a plurality of touch screens; a data driving circuit for supplying a data voltage to the data lines; a gate driving circuit for supplying a gate voltage to the gate lines; a touch sensing circuit for applying a driving signal to the touch sensors to sense a change in a voltage or a capacitance value of the touch sensors; and a timing controller for time-dividing a first frame period into a first driving period for sensing the touch sensors and a second driving period for performing display on the display panel, wherein the timing controller performs a control to supply a data voltage to a first area of the first driving period adjacent to a boundary surface between the first driving period and the second driving period.