Display Driver Voltage Segmentation for Panel Adaptability
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Solution Overview
Problem
The existing display drivers face challenges in achieving high-speed driving of display panels with varying configurations, such as stripe arrangements and PenTile matrices, due to the need for switching between different gamma characteristics, which leads to reduced driving speed and increased manufacturing costs.
Innovation Solution
A display driver is designed with multiple gradation reference voltage generating circuits and DA conversion circuits that generate and select gradation voltages based on gamma correction characteristics for different color components, allowing for continuous operation without the need for gamma characteristic switching, and includes an output control unit that manages the assignment of gradation voltages to driving voltage signals in a time-divisional manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gamma characteristic switching is implemented to support different display panel configurations, then adaptability to various panel types is improved, but driving speed deteriorates due to switching delays
Solution Approach 1:
The patent segments the reference voltage generation function into multiple independent circuits, each dedicated to a specific color component (red, green, blue). This segmentation eliminates the need to switch between different gamma characteristics because each color component has its own dedicated reference voltage circuit that continuously operates without switching delays.
Solution Approach 2:
The patent implements multi-functionality by enabling the display driver to handle both stripe arrangement and PenTile matrix configurations simultaneously through dedicated reference voltage circuits for each color component. The system can process different panel types without requiring gamma characteristic switching, as each color channel operates independently with its own reference voltages.
2Manufacturing precision
If multiple DA conversion circuits are provided for different color components, then gamma correction accuracy for various panel types is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing dedicated reference voltage generating circuits specifically for color components at positions where PenTile matrix display cells are arranged. This localized approach ensures accurate gamma correction for PenTile configurations without requiring complete redesign of the entire circuit architecture, thus improving precision while controlling complexity.
Solution Approach 2:
The patent implements dynamic adaptability by configuring the display driver to automatically select and operate the appropriate reference voltage circuits based on the panel type (stripe or PenTile). The system dynamically adjusts which circuits are active without requiring physical reconfiguration, maintaining high gamma correction accuracy while managing circuit complexity through intelligent control.
Data Source
AI summary
The present invention includes first to j-th DA conversion circuits that are fixedly coupled to one of a plurality of gradation reference voltage generating circuits steadily generating respective gradation reference voltage groups according to gamma correction characteristics of color components different from one another, and select a gradation reference voltage corresponding to a pixel data piece among the gradation reference voltage group generated by the one of gradation reference voltage generating circuits to output the gradation reference voltage as a gradation voltage, an output unit that assigns the first to j-th gradation voltages to respective first to j-th driving voltage signals in a mode according to an output switching signal, and outputs the first to j-th driving voltage signals to the display panel, and an output control unit that generates the output switching signal to switch modes of assigning the first to j-th gradation voltages to the first to j-th driving voltage signals at every division period obtained by dividing a horizontal scanning period by a division number indicated by a division number setting signal, and outputs an input switching signal that causes the first to j-th driving voltage signals to be input in turn to the respective data lines as many as the division number at a cycle of the division periods for the respective first to j-th driving voltage signals.