Display Panel Driving Circuit for Common Voltage Coupling Compensation
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Solution Overview
Problem
The display panel experiences abnormal displays due to changes in data signals coupling with the common voltage through parasitic capacitors, leading to horizontal stripes when implementing an inline touch design with split common electrodes.
Innovation Solution
A driving circuit with a first control unit and compensation control unit that generates voltage signals based on feedback and input signals to compensate for common voltage coupling, allowing for separate common and modulation voltage outputs during display and sensing stages, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel implements an inline touch design with split common electrodes, then touch sensing function is achieved, but horizontal stripes appear on the display panel
Solution Approach 1:
The patent introduces a feedback mechanism where the driving circuit detects voltage changes on the common electrode during touch sensing and dynamically adjusts the common voltage to compensate for coupling interference. The feedback unit monitors the common electrode voltage, and the driving circuit modifies the common voltage based on this feedback to eliminate horizontal stripe artifacts while maintaining touch sensing functionality
Solution Approach 2:
The patent changes the voltage parameter of the common electrode dynamically. During touch sensing, the driving circuit adjusts the common voltage level based on detected coupling changes, transforming the common voltage from a static parameter to a dynamically adjusted one that compensates for interference and eliminates horizontal stripes
2Adaptability or versatility
If the common electrodes are split into multiple regions to implement touch sensing, then touch sensing capability is enabled, but abnormal displays occur due to parasitic capacitor coupling
Solution Approach 1:
The patent introduces an intermediary compensation mechanism between the data signal and the common electrode. The driving circuit acts as an intermediary that detects the coupling effect caused by parasitic capacitors and actively compensates for it by adjusting the common voltage, thereby eliminating the harmful display artifacts while preserving touch sensing capability
Solution Approach 2:
The system implements feedback by continuously monitoring the common electrode voltage during touch sensing operations. The feedback unit detects voltage changes caused by parasitic capacitor coupling, and the driving circuit uses this information to dynamically adjust the common voltage, creating a closed-loop system that eliminates horizontal stripes
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 solution effectively compensates for common voltage coupling influences, reducing horizontal stripes and enabling seamless display and touch sensing functions.
Implementation Method 1
changes in the data signal are coupled to the common voltage through the parasitic capacitor
Data Source
AI summary
A driving circuit of a display panel is provided. The display panel includes sensing electrodes. The driving circuit includes a first control unit and a compensation control unit. The first control unit outputs a common voltage or a modulation voltage to the sensing electrodes. The compensation control unit is electrically connected to an input signal line and the first control unit. In a display stage, the compensation control unit generates a first voltage signal according to a feedback signal and an input signal transmitted by the input signal line, and the first control unit outputs the common voltage according to the first voltage signal. In a sensing stage, the compensation control unit generates a second voltage signal according to the input signal, and the first control unit outputs the modulation voltage according to the second voltage signal.