Liquid Crystal Driving Apparatus Sub-Field Timing Control
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Solution Overview
Problem
The sub-field driving method for liquid crystal elements often results in disclination, leading to reduced luminance and image quality degradation due to overlapping ON and OFF periods in adjacent pixels, with existing correction methods damaging gradation and causing luminance issues.
Innovation Solution
A liquid crystal driving apparatus and method that generates sub-frame image data to control the application of first and second voltages in sub-field periods, separating ON/OFF periods to prevent disclination, and using gain calculations to adjust gradation values, thereby maintaining luminance and preventing image degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-field driving method is used to control luminance by changing voltage application period, then digital driving precision is improved, but disclination occurs causing luminance drop and image quality degradation
Solution Approach 1:
The patent divides the frame period into multiple sub-field periods with different time weights, and further segments each sub-field into multiple sub-frames. By controlling voltage application in these segmented time periods, the patent achieves precise luminance control while preventing disclination through careful timing management of adjacent pixels.
Solution Approach 2:
The patent employs periodic voltage application patterns across different sub-field periods, where voltage is applied in a rhythmic on/off manner with varying time weights. This periodic action allows digital luminance control while the structured timing prevents disclination by ensuring proper synchronization between adjacent pixels.
2Object-affected harmful factors
If common correction amount is added to gradation data to reduce disclination visibility, then image quality degradation is mitigated, but gradation is damaged causing luminance issues
Solution Approach 1:
Instead of applying a uniform correction to all pixels, the patent applies different correction amounts to different pixels based on their specific gradation values and positions. This local quality approach allows disclination correction while preserving gradation precision by tailoring the correction to each pixel's needs.
Solution Approach 2:
The patent dynamically adjusts correction parameters based on the input image data and displays a plurality of different corrected images. By changing correction parameters adaptively rather than using a fixed correction amount, the patent maintains both disclination suppression and gradation accuracy.
3Adaptability or versatility
If ON period and OFF period overlap in adjacent pixels to display gradation, then digital driving function is achieved, but disclination occurs causing dark lines
Solution Approach 1:
The patent performs preliminary timing management of voltage application in different sub-field periods. By pre-planning the on/off timing of adjacent pixels across multiple sub-frames, the patent enables gradation display while preventing disclination through careful advance coordination of voltage application patterns.
Solution Approach 2:
The patent moves from simple temporal on/off control to a multi-dimensional control approach using different sub-field periods with varying time weights. By adding the dimension of time-weighted sub-field division, the patent achieves gradation display without disclination through sophisticated timing orchestration across multiple temporal layers.
Data Source
AI summary
A liquid crystal driving apparatus includes a driver configured to form a gradation in the pixel based on each gradation value in the plurality of sub-frame image data by sequentially controlling an application of a first voltage and an application of a second voltage lower than the first voltage for the plurality of pixels in each of a plurality of sub-field periods contained in one frame period. Where an input gradation value is defined as the gradation value of the input frame image data, the image data generator generates a first sub-frame image data having a first gradation value higher than the input gradation value and a second sub-frame image data having a second gradation value lower than the input gradation value as at least the plurality of sub-frame image data.