Display Panel Driving Circuit Waveform Compensation
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Solution Overview
Problem
Conventional liquid crystal display panel driving circuits result in color differences due to unequal charge/discharge waveforms between near-end and far-end cells, caused by varying equivalent resistances, leading to waveform attenuation at the far end.
Innovation Solution
A display panel driving circuit with a pre-charging control circuit that adjusts signal pulse width and height based on display data to ensure equal waveforms at both near-end and far-end loads, using a width control circuit and height control circuit to compensate for resistance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same charge/discharge signal is sent to near-end and far-end cells, then the driving circuit is simple, but waveform attenuation occurs at the far end causing image difference
Solution Approach 1:
The patent applies local quality by differentiating the charge/discharge signals based on the position of the load (near-end vs. far-end). The pre-charging control circuit determines whether to output a first signal (for near-end) or second signal (for far-end) based on the display data, ensuring each region receives appropriately tailored signal characteristics to compensate for its specific electrical characteristics.
Solution Approach 2:
The patent changes the parameters of the charge/discharge signals (voltage level, pulse width) based on the load position. The pre-charging control circuit adjusts these parameters dynamically - outputting different signal characteristics to near-end loads versus far-end loads - thereby compensating for waveform attenuation and ensuring consistent image quality across the display panel.
2Manufacturing precision
If higher voltage is applied to far-end loads to compensate for attenuation, then waveform height at far end improves, but energy consumption increases
Solution Approach 1:
The system applies higher voltage only locally to far-end loads when necessary, rather than uniformly across the entire display panel. The pre-charging control circuit identifies far-end loads and applies enhanced charge/discharge signals selectively, while near-end loads receive standard signals, thereby minimizing overall energy consumption while maintaining waveform consistency where needed.
Solution Approach 2:
The patent applies partial excessive action by providing higher voltage and adjusted pulse width only to the extent necessary to compensate for attenuation in far-end loads. The pre-charging control circuit calculates and applies the minimum required compensation, avoiding excessive energy consumption while achieving the goal of waveform height consistency.
3Manufacturing precision
If different pulse width and height are applied to far-end loads, then waveform compensation is achieved, but control circuit complexity increases
Solution Approach 1:
The pre-charging control circuit performs preliminary action by pre-calculating and preparing different charge/discharge signal characteristics before they are needed. The circuit determines in advance whether to output first or second signals based on display data, and the width control circuit and height control circuit prepare the appropriate pulse width and height parameters, reducing the complexity of real-time control.
Solution Approach 2:
The control circuit is segmented into functional modules: a pre-charging control circuit that determines signal type, a width control circuit that adjusts pulse duration, and a height control circuit that sets voltage level. This segmentation allows each module to handle specific compensation tasks independently, making the overall system more manageable despite the increased functionality required for waveform consistency.
Data Source
AI summary
The present invention provides a display panel driving circuit and compensation method thereof. The display panel driving circuit comprises a near end load, a far end load, an operating circuit and a pre-charging control circuit. The operating circuit is configured to receive display data. The pre-charging control circuit is coupled to the near end load and the far end load respectively. The pre-charging control circuit outputs a first signal and a second signal to the near end load and the far end load respectively according to the display data that a first waveform from the near end load is the same as a second waveform from the far end load.