Display Driving Device Polarity-Specific Overdriver Compensation
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Solution Overview
Problem
Existing display technologies face challenges in achieving optimal grayscale transitions due to slow liquid crystal response times, leading to issues like image sticking and incorrect grayscale representation when using a single set of line over driver compensation data for both positive and negative frame images.
Innovation Solution
A display driving device and method that utilize separate line over driver compensation data for positive and negative frame images, including distinct grayscale and gain compensation tables to determine target over driver grayscales for each polarity, reducing charging differences and improving image display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of line over driver compensation data is used for both positive and negative frame images, then device complexity is reduced, but manufacturing precision deteriorates due to charging differences causing image sticking and incorrect grayscale representation
Solution Approach 1:
The patent segments the line over driver compensation data into separate data sets for positive polarity frames and negative polarity frames. Each polarity has its own compensation table with optimized parameters, allowing precise control of grayscale transitions for each frame type while accounting for the different charging characteristics of the liquid crystal material under opposite polarities.
Solution Approach 2:
The patent applies local quality by using polarity-specific compensation parameters tailored to the local characteristics of each frame type. The compensation data is customized for each polarity condition, optimizing the grayscale transition performance for positive frames differently from negative frames, thereby achieving high precision grayscale representation.
2Speed
If line over driver compensation is applied to increase liquid crystal turnover speed, then response time is reduced, but manufacturing precision deteriorates due to undershooting and overshooting in grayscale transitions
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and storing compensation values in separate tables for positive and negative polarities that counteract the expected undershooting and overshooting effects. The compensation data is optimized in advance to prevent grayscale inaccuracies before they occur during actual display operation.
Solution Approach 2:
The patent changes the compensation parameters based on polarity conditions. Different overdriver voltages and compensation factors are applied depending on whether the current frame is positive or negative polarity, allowing the system to maintain high response speed while achieving accurate grayscale transitions through polarity-adaptive parameter adjustment.
Data Source
AI summary
A display driving device configured to control a display panel including pixel units to display, includes: an over driver compensation module configured to, when a first polarity frame image is displayed, perform line over driver compensation on the pixel units based on line over driver compensation data corresponding to the first polarity frame image, to determine a target over driver grayscale of the pixel units; and to, when a second polarity frame image is displayed, perform line over driver compensation on the pixel units based on line over driver compensation data corresponding to the second polarity frame image, to determine a target over driver grayscale of the pixel units. The first and second polarity are opposite to each other, and the line over driver compensation data corresponding to the first polarity frame image is different from the line over driver compensation data corresponding to the second polarity frame image.