Dual-Amplifier Source Driver for High-Resolution Display Speed
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Solution Overview
Problem
Display panels with high resolution face challenges in displaying high-resolution images at high speeds due to increased parasitic capacitance and resistance, making it difficult to achieve fast image display.
Innovation Solution
A display apparatus with a source driver comprising a coarse driving amplifier and a fine driving amplifier, along with a multiplexer, that performs alternating fine and coarse driving cycles to efficiently drive pixels, reducing the time required to reach desired grayscale voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high resolution is implemented, then image quality is improved, but display speed deteriorates due to increased parasitic capacitance and resistance
Solution Approach 1:
The source driver is divided into two independent amplifiers: a coarse driving amplifier for rapid voltage transitions and a fine driving amplifier for precise voltage adjustment. This segmentation allows each amplifier to be optimized for its specific function, enabling high-resolution display while maintaining high speed by performing coarse driving first to overcome parasitic effects, then fine driving to achieve precise grayscale levels
Solution Approach 2:
The coarse driving amplifier performs preliminary action by rapidly charging or discharging the source line to near-target voltage levels before the fine driving amplifier makes precise adjustments. This preliminary action overcomes the limiting effect of parasitic capacitance and resistance, allowing the subsequent fine driving phase to operate more efficiently and achieve high resolution faster
2Device complexity
If a single amplifier is used for driving, then device complexity is reduced, but driving time increases due to sequential operation requirements
Solution Approach 1:
While one amplifier is performing fine driving on a particular channel, the other amplifier simultaneously performs coarse driving on a different channel. This parallel operation ensures that useful action continues without interruption across all channels, effectively hiding the coarse driving time within the fine driving period of other channels and reducing overall driving time
Solution Approach 2:
The source driver operates in periodic cycles where coarse driving and fine driving are alternately performed on different channels. Each channel receives coarse driving during periods when other channels are undergoing fine driving, creating a periodic pattern that maximizes resource utilization and minimizes total driving time
Data Source
AI summary
The present embodiment provides a display apparatus for displaying an image, the display apparatus comprising: a display panel including a plurality of pixels; a timing controller providing a digital signal corresponding to the image; and a source driver converting the digital signal into a grayscale signal which is an analog signal and providing the grayscale signal to the plurality of pixels, wherein the source driver comprises: a coarse driving amplifier providing the grayscale signal to a load connected to the source driver for coarse driving; a fine driving amplifier providing the grayscale signal to a load connected to the source driver for fine driving; and a multiplexer (MUX) multiplexing outputs of the coarse driving amplifier and the fine driving amplifier and outputting to the load.