LCD Panel Module Gamma Voltage Control via Data Segmentation
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panel modules are limited in providing optimal color presentation due to the inability to independently adjust gamma reference voltages for red, green, and blue display sub-areas without increasing the complexity and cost of source drivers, which requires multiple internal gamma reference circuits.
Innovation Solution
The LCD panel module design includes a source driver with a receiver unit, latch register unit, multiplexer unit, and output buffer unit, and a timing controller with a receiver unit, data latch logic circuit, and data process logic circuit, allowing for the rearrangement of multi-color display data into single-color display data groups, enabling independent adjustment of gamma reference voltages without additional circuit design, and the source and gate drivers are reconfigured to improve charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If triple interior gamma reference circuits are added in source drivers to provide red, green and blue gamma reference voltages, then color presentation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The single gamma reference voltage generator is designed to provide multiple color-specific gamma reference voltages (red, green, blue) through a unified circuit structure. The generator receives control signals indicating the current display color and outputs the appropriate gamma reference voltage for that color, allowing one circuit to perform multiple color-specific functions without requiring separate circuits for each color.
2Device complexity
If single gamma reference voltage is provided to source drivers, then circuit complexity is reduced, but optimal modulation of red, green and blue gamma curves cannot be achieved
Solution Approach 1:
The gamma reference voltage generator is designed with dynamic switching capability that allows it to change output characteristics based on input control signals. When the generator receives a control signal indicating red color display, it outputs red-specific gamma reference voltage; when green is indicated, it outputs green-specific voltage, and similarly for blue. This dynamic adaptability enables optimal gamma curve modulation for each color while maintaining a single generator circuit.
3Productivity
If source drivers are configured to handle multi-color data simultaneously, then data processing efficiency is maintained, but independent gamma adjustment for each color becomes impossible
Solution Approach 1:
The display data stream is segmented by color components (red, green, blue) and processed in an interleaved manner. The timing controller and source drivers are configured to separate multi-color display data into color-specific data groups, process them through the single gamma reference voltage generator which switches between color-specific voltages, and then recombine them for display. This segmentation allows independent gamma adjustment for each color while maintaining efficient data processing.
Data Source
AI summary
A liquid crystal display panel module includes a display panel, a plurality of source drivers, a plurality of gate drivers, a gamma reference voltage generator and a timing controller, in which the timing controller controls operations of the gate drivers, of the source drivers and of the gamma reference voltage generator, so that the source drivers can, based on one set of gamma reference voltages, output single-color data groups to corresponding display sub-areas in the display panel, respectively.