Display Panel Driving System with Shared Gamma Voltage Channels
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Solution Overview
Problem
Conventional display technologies face challenges with large area occupation, high time requirements, and high power consumption in achieving independent gamma curves for RGB colors, particularly in high-resolution displays.
Innovation Solution
A driving system for a display panel that generates (2m+k+1) initial grayscale voltages and uses a ramp voltage curve generating circuit to produce (2m+1) ramp voltage curves, with a source driving circuit selecting and interpolating these to generate additional ramp voltage curves, reducing the number of required wire channels and improving time efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional analog source gamma implementation method is used to generate independent gamma curves for RGB, then grayscale precision is improved, but area occupation increases significantly
Solution Approach 1:
The patent merges the gamma curve generation for RGB colors into a unified implementation. Instead of using 195 separate voltage wire channels (65 per color × 3 colors), the invention uses a shared voltage wire channel that can generate gamma curves for all RGB colors through time-division multiplexing and digital control, significantly reducing area occupation while maintaining grayscale precision
Solution Approach 2:
The patent introduces dynamic control mechanisms including a digital-to-analog converter (DAC) and gamma control circuit that can dynamically adjust and generate different gamma curves for RGB colors on-demand. This dynamic approach replaces static dedicated voltage channels with flexible programmable control, achieving independent gamma curves without proportionally increasing hardware area
2Area of stationary object
If conventional ramp source gamma implementation method is used, then area occupation is reduced, but time duration for generating each grayscale voltage becomes insufficient
Solution Approach 1:
The patent pre-generates and stores multiple ramp voltage curves in a buffer memory before they are needed for display. By preparing the voltage curves in advance and storing them, the system ensures that when display is needed, the pre-computed voltage curves are already available, eliminating time constraints during actual display operation
Solution Approach 2:
The patent introduces a buffer memory as an intermediary between the voltage generation circuit and the display output. The buffer stores pre-generated ramp voltage curves and supplies them to the display when needed, decoupling the voltage generation process from the display timing requirements and ensuring sufficient time for voltage generation
3Measurement precision
If conventional digital gamma implementation method is used to achieve independent gamma curves, then gamma accuracy is improved, but power consumption increases exponentially
Solution Approach 1:
The patent replaces complex digital signal processing with analog voltage curve generation and selection. Instead of using high-speed digital circuits to compute gamma curves in real-time (which consumes exponential power), the system uses a more power-efficient approach of pre-generating analog voltage curves and selecting them through a DAC and multiplexer, maintaining gamma accuracy while dramatically reducing power consumption
Data Source
AI summary
The present disclosure provides a driving system. The driving system includes: a voltage generating circuit configured to generate (2m+k+1) initial grayscale voltages; a ramp voltage curve generating circuit configured to generate (2m+1) ramp voltage curves by using the (2m+k+1) initial grayscale voltages based on k-bit data of received pixel data, each ramp voltage curve of the (2m+1) ramp voltage curves including 2k step voltages; a source driving circuit configured to generate additional 2n ramp voltage curves by using any two adjacent ramp voltage curves of the (2m+1) ramp voltage curves based on m-bit data of the received pixel data; and an output control circuit configured to select a grayscale voltage of the ramp voltage curves based on the received pixel data and send the selected grayscale voltage to the data signal input terminals of the pixel circuit.