Display Module Buffer Amplifier for Horizontal Crosstalk Mitigation
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Solution Overview
Problem
Conventional display modules suffer from horizontal crosstalk due to the coupling capacitor between data lines and common electrodes, which causes instantaneous changes in common voltage and inability to cancel out positive and negative polarity data voltage signal coupling.
Innovation Solution
The display module incorporates data driver integrated circuits with buffer amplifiers, gamma voltage terminals, data voltage terminals, and simulation voltage terminals, where the simulation voltage terminal is connected to the gamma voltage terminal via a capacitor, allowing for capacitive coupling of waveforms to maintain constant voltage differences during grayscale switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling capacitor exists between data line and common electrode, then data voltage signals can be transmitted, but horizontal crosstalk occurs due to instantaneous changes in common voltage
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensation capacitor connected between the data line and common electrode. This capacitor is pre-configured to generate a compensating signal that counteracts the harmful coupling effect before it manifests as horizontal crosstalk. When the data voltage changes, the compensation capacitor produces an opposing voltage change that cancels out the unwanted coupling, thereby preventing horizontal crosstalk while maintaining reliable signal transmission.
2Ease of manufacture
If conventional display module structure is used, then manufacturing is simple, but horizontal crosstalk cannot be eliminated
Solution Approach 1:
The patent merges the compensation function directly into the existing display module structure by integrating the compensation capacitor with the data driver circuitry. Rather than adding a separate complex compensation system, the invention combines the compensation capability with the existing signal transmission path, allowing horizontal crosstalk elimination while maintaining manufacturing simplicity. The compensation capacitor is connected in a way that utilizes existing circuit elements, avoiding the need for additional complex components or manufacturing steps.
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 effectively mitigates horizontal crosstalk by ensuring that the voltage differences of positive and negative polarity data voltage signals relative to the common voltage signal remain constant during grayscale switching, without the need for additional inverters.
Implementation Method 1
the simulation voltage terminal is electrically connected to the gamma voltage terminal via a capacitor
Implementation Method 2
a coupling capacitor exists between a data line and a common electrode. Due to the influence of the coupling capacitor, when there is an instantaneous change in the data line voltage, the common voltage also undergoes a change due to coupling
Data Source
AI summary
An embodiment of the present application discloses a display module and terminal apparatus. The display module includes a plurality of data driver integrated circuits. Each data driver integrated circuit includes a buffer amplifier, a gamma voltage terminal, a data voltage terminal, and a simulation voltage terminal. The buffer amplifier includes an input terminal electrically connected to the gamma voltage terminal, an output terminal electrically connected to the data voltage terminal, and an auxiliary signal input terminal electrically connected to the simulation voltage terminal. The simulation voltage terminal is electrically connected to the gamma voltage terminal via a capacitor. When switching between grayscales, a fluctuation of the simulation voltage terminal is coupled to a signal of the gamma voltage terminal by capacitive coupling, the signal of the gamma voltage terminal includes a fluctuation with the same phase as in the common voltage terminal.