Dual Gamma Voltage Source Driving Module for LCD Color Shift
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Solution Overview
Problem
Conventional liquid crystal display devices with vertically arranged sub-pixels suffer from color shift due to insufficient charging, leading to decreased display quality.
Innovation Solution
A source driving module with two gamma voltage generators and a voltage selector that alternates between the two voltages to drive sub-pixels in a column, ensuring effective charging and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gamma voltage generator is used to drive vertically arranged sub-pixels, then the device complexity is reduced, but color shift occurs due to insufficient charging of sub-pixels
Solution Approach 1:
The gamma voltage generator is segmented into two independent gamma voltage generators (first and second), each capable of generating gamma voltages with different characteristics. This segmentation allows different sub-pixels to be charged with appropriately tailored voltage profiles, resolving the color shift issue while maintaining manageable system complexity through modular design.
Solution Approach 2:
Different gamma voltages are applied to different sub-pixels based on their specific charging requirements. The system selectively applies first gamma voltages to some sub-pixels and second gamma voltages to others, ensuring each sub-pixel receives the optimal voltage profile for its characteristics, thereby eliminating color shift while adapting to local needs.
2Manufacturing precision
If two gamma voltage generators are used to drive sub-pixels, then color shift is reduced, but the device complexity increases
Solution Approach 1:
The voltage selector serves multiple functions: it selects between first and second gamma voltages, controls the timing of voltage application, and manages the switching between different gamma voltage profiles. This multi-functionality reduces the need for additional separate control circuits, thereby limiting the increase in device complexity while achieving improved color accuracy.
Solution Approach 2:
The system employs periodic switching between first and second gamma voltages through the voltage selector. By alternately applying different gamma voltage profiles in a periodic manner synchronized with the display refresh cycle, the system achieves effective sub-pixel charging without requiring continuously complex control mechanisms.
3Manufacturing precision
If a voltage selector is added to switch between two gamma voltages, then sub-pixel charging is improved, but the device complexity increases
Solution Approach 1:
The voltage selector is merged with the gamma voltage generator system as an integrated component rather than a separate external device. By combining the voltage selection and switching functionality within the existing driver architecture, the patent minimizes the additional complexity introduced while achieving improved sub-pixel charging accuracy.
Data Source
AI summary
A source driving module is disclosed, for providing a data signal to a display panel. The source driving module includes a gamma voltage generator, and a data driver receiving a gamma voltage outputted from the gamma voltage generator and generating a corresponding data signal to a display panel according to the gamma voltage. Wherein, the gamma voltage generator includes a first gamma generator and a second gamma voltage generator, the first gamma generator outputs a first gamma voltage, and the second gamma generator outputs a second gamma voltage. Wherein, the source driving module further comprises a voltage selector adapted for selecting one of the first gamma voltage and the second gamma voltage in a same moment to input to the data driver. A liquid crystal display device including the source driving module is also disclosed.