Data Driver White Voltage Channels for 240 Hz Display
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Solution Overview
Problem
Existing display devices face challenges in expressing various image data signal formats such as RGB/YCbCr 4:4:4/YCbCr 4:2:2/YCbCr 4:2:0 without redesigning or changing the display panel, and there is a need to minimize the increase in chip size of the data driver when selectively driving the panel at frequencies of 120 Hz or 240 Hz.
Innovation Solution
A data driver with a white data voltage output circuit having two channels that operate differently based on driving conditions, allowing for the output of red, green, and blue data voltages, and enabling the display panel to operate at either 120 Hz or 240 Hz without increasing the chip size by minimizing the number of circuits required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple white data voltage channels are added to support both 120 Hz and 240 Hz driving frequencies, then the display device can express various image data signal formats at higher frequencies, but the chip size of the data driver increases
Solution Approach 1:
The patent implements dynamic channel activation where the second white data voltage channel is selectively enabled or disabled based on the driving frequency. At 120 Hz, only the first channel operates, while at 240 Hz, both channels are activated. This dynamic configuration allows the system to adapt its resource usage to performance requirements, achieving high-speed driving capability when needed while maintaining compact size during normal operation.
Solution Approach 2:
The patent changes the operational parameters of the data driver by adjusting the number of active white data voltage channels based on driving frequency requirements. The system transitions between different operational states: single-channel mode for 120 Hz and dual-channel mode for 240 Hz. This parameter-based adaptation enables the same hardware architecture to support multiple performance levels without requiring separate physical designs for each frequency.
2Adaptability or versatility
If additional circuits are added to support dual-channel white data voltage output, then the display panel can be driven at 240 Hz, but the number of circuits increases leading to larger chip size
Solution Approach 1:
The patent designs the data driver with a universal architecture where the second white data voltage channel and its associated circuits (latch, converter, amplifier, switch) are integrated into the existing framework. These components can serve dual purposes: they remain dormant during 120 Hz operation to maintain simplicity, but become fully functional during 240 Hz operation to provide the additional bandwidth required. This multi-functionality allows the same circuit elements to support both low and high frequency modes.
Solution Approach 2:
The patent segments the white data voltage output function into two independent channels, each with its own complete signal processing chain (latch, converter, amplifier, switch). This segmentation allows the system to activate only the necessary portion of the circuitry based on performance requirements. The modular structure enables flexible configuration where the second channel can be added without fundamentally redesigning the first channel, thus managing complexity through structured division of functions.
Data Source
AI summary
A data driver can include a white data voltage output circuit having an Ath channel for outputting a first white data voltage and a Bth channel for outputting a second white data voltage different from the first white data voltage. The data driver can further include red, green, and blue data voltage output circuits configured to output a red data voltage, a green data voltage, and a blue data voltage, respectively. One of the Ath channel and the Bth channel can operate in a first driving condition, and the Ath channel and the Bth channel can operate together in a second driving condition.