Shared-Latch Source Driver Layout for High-Resolution LCDs
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Solution Overview
Problem
The increasing resolution of LCD screens requires a large number of source drivers, leading to a high number of latch devices and increased power consumption, which is undesirable.
Innovation Solution
A source driver design that incorporates a master latch device and multiple slave latch devices, where the master latch device and slave latch devices are concurrently driven by enable signals to latch data, reducing the number of transistors and devices needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of LCD screen is increased, then the display quality is improved, but the number of source drivers and latch devices must be increased
Solution Approach 1:
The patent merges the functionality of multiple independent latch devices into a single integrated latch device that can simultaneously control multiple source drivers. This is achieved by sharing common transistor components (such as transistors M1-M4) across multiple latch circuits, allowing one latch device to perform the function of what would traditionally require multiple separate latch devices, thereby reducing overall device complexity while maintaining high display resolution
2Quantity of substance
If the number of latch devices is increased to support higher resolution, then the data buffering capability is improved, but the power consumption is increased
Solution Approach 1:
The patent combines multiple latch devices into a single integrated latch device that serves multiple source drivers simultaneously. By sharing common transistors and control signals, the patent reduces the total number of active components that consume power, thereby lowering overall power consumption while maintaining the necessary data buffering capacity for high-resolution displays
3Adaptability or versatility
If the number of transistors in source driver is increased, then the functionality and control capability are improved, but the layout area is increased
Solution Approach 1:
The patent merges multiple latch devices into a single integrated structure where transistors are shared across multiple functional units. This consolidation reduces the total layout area required while preserving the control capability needed for high-resolution displays, as the shared transistors can be controlled through coordinated enable signals
4Reliability
If multiple independent latch devices are used for each source driver, then the reliability and independent control are improved, but the number of devices and complexity are increased
Solution Approach 1:
The patent merges multiple latch devices into a single integrated latch device that can independently control multiple source drivers through shared transistors and coordinated enable signals. This approach maintains reliability by preserving independent control paths while reducing device complexity through component sharing and integration
Data Source
AI summary
A source driver with reduced number of latch devices includes a master latch device and at least one slave latch device. The master latch device has a first transmission gate, a first inverter, a second inverter, a first enable gate, and a second enable gate. The output of the second inverter is connected to the input of the first inverter. The at least one slave latch device has a second transmission gate, a third inverter, and a fourth inverter. When the first enable gate and the second enable gate receive a latch enable signal and a complementary latch enable signal respectively, the master latch device and the at least one slave latch device are concurrently driven to latch data.