In-Cell Display Data Line Control for Touch Sensitivity
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Solution Overview
Problem
In-cell display devices face reduced touch sensitivity due to parasitic capacitors formed between data lines and receiving electrodes, leading to noise and instability during touch sensing periods, whether data lines are connected to ground or floated.
Innovation Solution
Connecting data lines to ground during a touch preparation period and floating them during a sensing pulse output period when sensing pulses are supplied to driving electrodes, to minimize parasitic capacitors and enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If data lines are connected to ground during touch sensing period, then data line stability is improved, but parasitic capacitors are formed between data lines and receiving electrodes, reducing touch sensitivity
Solution Approach 1:
The patent dynamically changes the state of data lines during the touch sensing period. Specifically, the data lines are connected to ground during the touch preparation period (before sensing pulses are applied) to stabilize them, and then floated (disconnected from ground) during the sensing pulse output period to minimize parasitic capacitors. This dynamic state change resolves the contradiction by applying different configurations at different times within the same operational period.
Solution Approach 2:
The patent applies preliminary grounding action to data lines during the touch preparation period before the actual touch sensing begins. This preliminary connection to ground stabilizes the data lines in advance, and then the data lines are floated before sensing pulses are applied to minimize parasitic effects during the actual measurement, thus resolving the contradiction between stability and sensitivity.
2Measurement precision
If data lines are floated during touch sensing period, then parasitic capacitors are reduced, but data lines become unstable, causing noise and reducing touch determination accuracy
Solution Approach 1:
The patent implements dynamic control of data line states by switching between grounded and floated conditions. During the touch preparation period, data lines are grounded for stability; during the sensing pulse output period, they are floated to reduce parasitic capacitors. This time-dependent state switching resolves the contradiction by optimizing each phase for its specific requirement.
Solution Approach 2:
The patent applies periodic switching of data line states within the touch sensing period. The data lines are periodically connected to ground during the preparation phase and then periodically floated during the sensing phase. This periodic action allows the system to alternately achieve stability and minimize parasitic effects, resolving the contradiction through rhythmic state changes.
3Stability of the object's composition
If data lines are connected to ground before sensing pulses are applied, then data line stability is improved, but touch sensitivity is reduced due to formed parasitic capacitors
Solution Approach 1:
The patent applies preliminary grounding to data lines during the touch preparation period to stabilize them before sensing pulses are applied. After this preliminary stabilization phase, the data lines are floated before the actual sensing begins, ensuring that parasitic capacitors are minimized during the critical measurement phase while stability was established in advance.
Solution Approach 2:
The patent dynamically transitions data lines from a grounded state (for stability) to a floated state (for sensitivity) within the touch sensing period. This dynamic state change allows the system to sequentially achieve both stability and sensitivity, resolving the contradiction by applying different configurations at optimally timed moments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes data lines before touch sensing, reduces parasitic capacitors, and improves touch sensitivity by maintaining data lines in a floating state during sensing pulse output, thereby enhancing the accuracy of touch determination and sensitivity.
Implementation Method 1
a data line controller that connects a plurality of data lines to ground in a sensing pulse non-output period where a plurality of the sensing pulses are not supplied to the plurality of driving electrodes
Implementation Method 2
reduced parasitic capacitors, and improves touch sensitivity by maintaining data lines in a floating state during sensing pulse output
Data Source
Figure 1
Figure 2~3(b)
Figure 4(a)~4(b)
AI summary
Disclosed is a display device. The display device includes a panel into which a touch panel including a plurality of driving electrodes and a plurality of receiving electrodes is built, a touch sensing unit configured to supply a plurality of sensing pulses to the plurality of driving electrodes during a touch sensing period, a driver configured to drive the panel to allow the panel to display an image during an image display period, and a data line controller configured to connect a plurality of data lines to ground in a sensing pulse non-output period where the plurality of the sensing pulses are not supplied to the plurality of driving electrodes during the touch sensing period.