LCD Driving Device Overshoot Correction
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving sufficient response speed and display quality due to excessive responses during overshooting driving operations, and existing solutions either suppress overshoot amounts insufficiently or increase costs and memory capacity.
Innovation Solution
A driving device for liquid crystal display panels that generates overshoot or undershoot gray-level data based on input display data, adjusts the gray-level data by a specified amount, and applies it to data electrodes to prevent excessive responses, using a gray-level data outputting circuit, overshoot calculating unit, and correcting unit to predict and correct excessive responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an overshooting driving operation is performed by applying an overvoltage exceeding a target voltage to increase liquid crystal response speed, then the response speed of the liquid crystal is improved, but an excessive response occurs in which the transmittance exceeds the target gray level causing degradation of display quality
Solution Approach 1:
The patent applies preliminary anti-action by predicting the excessive response in the next frame before it occurs and preemptively adjusting the gray-level data. The excessive response predicting section estimates the degree of excessive response based on current and past frame data, and the excessive response correcting section subtracts this predicted excessive response from the current frame's gray-level data. This preliminary correction prevents the excessive response from occurring in the first place, thereby maintaining display quality while still allowing overshooting driving to improve response speed.
Solution Approach 2:
The patent implements preliminary action by performing the excessive response prediction and correction in advance during the current frame processing, before the display of the next frame. By calculating the excessive response degree based on current and past frame data and adjusting the gray-level data beforehand, the system ensures that the corrected data is ready when needed, preventing display quality degradation without compromising the response speed improvement from overshooting driving.
2Speed
If the overshoot amount is increased to further improve response speed, then the response speed is enhanced, but the excessive response becomes more severe causing greater degradation of display quality
Solution Approach 1:
The patent employs feedback by using the actual display data from past frames (including the degree of gray level transition) to predict and correct excessive responses. The excessive response predicting section continuously monitors current and past frame data to estimate the excessive response degree, which then feeds back into the correction process. This feedback mechanism allows the system to dynamically adjust the gray-level data to compensate for overshooting effects, enabling larger overshoot amounts to be used safely while maintaining display quality stability.
3Manufacturing precision
If conventional methods suppress excessive response by decreasing overshoot amount in necessary frames, then display quality is maintained, but the response speed improvement becomes insufficient
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gray-level data parameter based on the predicted excessive response degree. Instead of simply reducing the overshoot amount in all cases, the system calculates the appropriate correction amount by changing the gray-level parameter to compensate for the expected excessive response. This allows the overshoot amount to be maintained at levels that provide response speed improvement, while the parameter adjustment ensures display quality is preserved through precise compensation.
Data Source
AI summary
A liquid crystal display panel driving device is provided which is capable of reliably improving a response speed of a liquid crystal and of obtaining good display quality. When overshooting driving is performed in a current frame for displaying, an excessive response level in a next frame is predicted based on a combination of a gray level in one past frame and a gray level in a current frame and, when an excessive response is predicted, a corrected gray-level value to prevent (or to cancel) the excessive response is calculated in advance. By applying a voltage corresponding to the corrected gray-level value, an excessive response in a next frame can be suppressed. Irrespective of whether or not an excessive response is predictable in a next frame, an overshooting driving can be performed at an applied voltage sufficiently corresponding to a target gray-level value and, as a result, a response speed of a liquid crystal can be reliably made high and good display quality can be obtained.