Display Device Common Lines for Touch Sensing
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Solution Overview
Problem
Display devices that integrate display and touch input functions face challenges in maintaining high-quality display performance while efficiently handling touch input operations, often resulting in incongruities between display resolution and input resolution, and increased power consumption during touch sensing.
Innovation Solution
The display device incorporates a configuration of gate lines, signal lines, common lines, and sense lines, where the common lines are used as counter electrodes for both display and touch sensing, allowing for the application of touch sensing pulse signals and reducing the load on driving circuits, thereby enhancing operation speed and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate line configurations are used for display and touch sensing operations, then display quality can be maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent applies multi-functionality by enabling the second lines (signal lines) and third lines (common lines) to serve dual purposes: driving the display layer during display operations and functioning as sense lines during touch sensing operations. The controller switches between operations by applying appropriate voltages to these lines, eliminating the need for separate dedicated sense lines and reducing overall device complexity while maintaining display quality
Solution Approach 2:
The patent merges the display driving lines and touch sensing lines into a unified configuration. The second lines and third lines are used for both display signal transmission and touch sensing, combining previously separate functions into a single integrated system. This merging reduces the number of required lines and simplifies the overall device structure
2Adaptability or versatility
If dedicated sense lines are provided for touch sensing, then touch input functionality is achieved, but power consumption and device complexity increase
Solution Approach 1:
The patent makes the existing display lines (second lines and third lines) perform dual functions by applying different voltage patterns. During touch sensing, these lines function as sense lines without requiring additional dedicated sensing pathways. This multi-functional approach enables touch sensing capability while avoiding the power consumption penalty of maintaining separate dedicated sense line infrastructure
Solution Approach 2:
The display lines serve themselves by performing both display driving and touch sensing functions. The second lines and third lines automatically switch between display and sensing modes based on controller commands, eliminating the need for separate self-service touch sensing infrastructure and reducing overall power consumption
3Ease of operation
If multiple separate lines are used for display and touch operations, then functional separation is achieved, but the load on driving circuits increases
Solution Approach 1:
The patent combines the display driving function and touch sensing function into a single set of lines (second lines and third lines). By merging these functions, the driving circuits only need to control one unified set of lines rather than managing separate independent line sets, thereby reducing the overall load on driving circuits while maintaining clear operational control through controller-managed voltage switching
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 configuration enables high-definition display with efficient touch input functionality, reducing the load on driving circuits and power consumption, while maintaining high-quality display performance during both display and touch sensing operations.
Implementation Method 1
The display layer performs an optical operation of at least one of a light emission or a change of an optical characteristic
Implementation Method 2
The display layer performs an optical operation of at least one of a light emission or a change of an optical characteristic
Data Source
AI summary
According to one embodiment, a display device includes a plurality of first lines, a plurality of second lines, a plurality of switch elements, a plurality of pixel electrodes, a plurality of third lines, a display layer, and a controller. The plurality of first lines extend in a first direction. The plurality of second lines extend in a second direction. The plurality of third lines extend in the second direction. The switch elements are electrically connected to the first lines and the second lines. The pixel electrodes are connected to the switch elements. The display layer performs an optical operation based on an electrical signal applied to the pixel electrodes. The controller includes at least one switch connected between the second lines and the third lines.