Liquid Crystal Display Driving Circuit Polarity Inversion Burn-in Correction
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in reducing image burn-in phenomena when using low-frequency driving or intermittent driving methods, which decrease power consumption but result in moving image blur and inadequate image burn-in improvement effects.
Innovation Solution
A liquid crystal display device and driving method that superpose a correction signal corresponding to the polarity inversion frequency and gray level on the video signals applied to the pixel electrode, adjusting the voltage to minimize image burn-in while reducing circuit power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low-frequency driving or intermittent driving methods are used, then power consumption is reduced, but image burn-in phenomenon is not adequately suppressed
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction signals for various gray levels and frame inversion frequencies before actual display operation. When low-frequency driving is initiated, the appropriate correction signal is already prepared and immediately applied, enabling effective image burn-in suppression without requiring real-time computation or complex feedback mechanisms, thus maintaining low power consumption while improving reliability.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the correction signal based on the frame inversion frequency and gray level parameters. The correction signal magnitude and characteristics are modified according to the specific operating conditions (different frame inversion frequencies and gray levels), allowing optimal image burn-in suppression across various low-frequency driving modes while maintaining energy efficiency.
2Reliability
If correction signal is superposed on video signals, then image burn-in is suppressed, but circuit complexity increases
Solution Approach 1:
The correction signals are pre-calculated and stored in memory during the design phase or initial setup, eliminating the need for complex real-time computation circuits. The driving circuit simply retrieves and applies the appropriate correction signal from storage based on the current frame inversion frequency and gray level, significantly reducing circuit complexity while maintaining effective image burn-in suppression.
Solution Approach 2:
The patent introduces an intermediary correction signal that mediates between the video signal and the liquid crystal display panel. This correction signal acts as a buffer that can be independently generated, stored, and applied without requiring complex interaction between multiple circuit components, thereby simplifying the overall circuit architecture while achieving reliable image burn-in suppression.
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
The solution effectively suppresses the image burn-in phenomenon, achieving both low power consumption and improved display quality, especially when decreasing frame inversion frequency, and maintains image quality by matching minimal-luminance Vcom deviations across various gray levels.
Implementation Method 1
the orientation direction of liquid crystal molecules contained in a liquid crystal layer held between upper and lower substrates is controlled by an electric field formed between a counterelectrode of the upper substrate and a pixel electrode of the lower substrate
Implementation Method 2
the orientation direction of liquid crystal modules contained in a liquid crystal layer is controlled by an electric field (fringe electric field) formed between the two electrodes
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.