Data Driver Channel Layout for Dense Gamma Voltage Routing
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Solution Overview
Problem
As pixel resolution increases in display devices, the physical space available for wiring and components for gamma voltage generation and distribution becomes inadequate, leading to inefficiencies.
Innovation Solution
A data driver design that includes latches, level shifters, decoders, and digital-to-analog converters, with transistors in latches being smaller than those in decoders and level shifters, to minimize wire density and optimize gamma voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel resolution is increased, then display quality is improved, but physical space for wiring and components becomes inadequate
Solution Approach 1:
The data driver is divided into multiple independent channels (first channel with first latch, first level shifter, first decoder, first DAC; second channel with second latch, second level shifter, second decoder, second DAC). This segmentation allows each channel to be optimized independently for area efficiency while maintaining high resolution display capabilities across the entire driver structure.
Solution Approach 2:
The patent transitions from horizontal wire routing to vertical stacking by placing level shifters, decoders, and DACs in a vertical arrangement within the driver structure. This dimensional change reduces wire length and routing area requirements, enabling higher pixel resolution without proportionally increasing the physical footprint of the driver.
2Area of stationary object
If transistor area in latches is reduced, then wire density is minimized, but gamma voltage generation capability may be compromised
Solution Approach 1:
Different transistor sizes are used in different parts of the circuit: smaller transistors in latches for area efficiency, and larger transistors in decoders and level shifters for reliable voltage generation. This local differentiation optimizes both area utilization and functional reliability throughout the data driver structure.
Solution Approach 2:
The patent changes the voltage range parameter through level shifters that convert from a first voltage range to a second voltage range. This parameter transformation enables compact latch design while maintaining adequate voltage levels for gamma voltage generation through the decoder and DAC stages.
3Measurement precision
If more wires are used for signal distribution, then control precision is improved, but wire density increases
Solution Approach 1:
Multiple control functions are merged into integrated blocks: the decoder combines multiple control signals to generate gate control signals, and the DAC integrates multiple data inputs to produce gamma voltages. This merging reduces the total number of separate wires needed while maintaining precise control over pixel elements.
Solution Approach 2:
Level shifters act as intermediary components between the latch stage and the decoder stage, transforming voltage ranges and enabling compact wire routing. These intermediaries reduce the complexity of direct wire connections while preserving signal integrity and control precision.
Data Source
AI summary
A data driver includes a first latch that provides a first color grayscale in a first voltage range; a first level shifter that converts the first color grayscale in the first voltage range into a first color grayscale in a second voltage range greater than the first voltage range; a first decoder that generates a first gate control signal in the second voltage range based on the first color grayscale in the second voltage range; and a first digital-to-analog converter that provides a first gamma voltage of the first color grayscale based on the first gate control signal in the second voltage range.