Display DAC Resistor Segmentation for Compact Grayscale Output
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Solution Overview
Problem
The layout space occupied by digital-to-analog conversion circuits in display devices is excessive due to the need for multiple resistors and decoders, hindering integration of additional functions.
Innovation Solution
A digital-to-analog conversion circuit with a first and second resistance distribution module, each comprising a series of distribution units with varying resistor values in a geometric sequence, controlled by specific signals to connect resistors between voltage terminals, reducing the number of resistors required while maintaining grayscale output capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional digital-to-analog conversion circuit uses multiple resistors and decoders to achieve grayscale levels, then the conversion precision is improved, but the layout space occupied increases
Solution Approach 1:
The patent divides the resistance distribution into two separate modules: a first resistance distribution module connected to the first voltage terminal and a second resistance distribution module connected to the second voltage terminal. Each module independently controls half of the grayscale levels, reducing the number of resistors needed in each module while maintaining the overall 16-level grayscale precision through coordinated operation of both modules.
Solution Approach 2:
The patent introduces a dual-voltage-terminal architecture that adds a dimensional aspect to the resistance distribution. By utilizing two voltage terminals (first voltage terminal and second voltage terminal) instead of a single reference, the circuit achieves the same grayscale precision with fewer resistors, as each module only needs to handle half the resolution requirements.
2Area of stationary object
If the number of resistors is reduced to decrease layout space, then the area occupied is reduced, but the complexity of controlling grayscale levels increases
Solution Approach 1:
The control complexity is segmented by dividing the grayscale control into two independent modules. Each module receives its own control signals and independently controls half of the grayscale levels. This segmentation reduces the complexity within each module while the overall system maintains full grayscale control through the combination of both modules' outputs.
Data Source
AI summary
The present disclosure discloses a display device and a digital-to-analog conversion circuit, including a first resistance distribution module and a second resistance distribution module, where each first distribution unit included in the first resistance distribution module enables a first resistor therein to be connected between a first voltage terminal and a voltage output node based on a first control signal, and each second distribution unit included in the second resistance distribution module enables a second resistor therein to be connected between the voltage output node and a second voltage terminal according to a second control signal.