Data Driving Device Gamma Voltage Circuit Area Reduction
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Solution Overview
Problem
The increasing number of bits in image data requires a large number of elements in digital-to-analog converters (DACs) for selecting gamma voltages, leading to increased area occupation in data driving devices, which is inefficient.
Innovation Solution
The proposed solution involves a data driving device that generates a plurality of gamma voltages by interpolating one reference voltage using current mirroring and resistor arrays, reducing the number of selecting elements needed in the DAC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of bits of image data increases to improve image quality, then the number of gamma voltages must increase, but the number of selecting elements and area occupied by the digital-to-analog converter increases significantly
Solution Approach 1:
The patent segments the selection process into two stages: first selecting circuit that selects from a reduced set of gamma voltages based on upper bits, and second selecting circuit that selects from further divided groups based on lower bits. This hierarchical segmentation reduces the total number of selecting elements required while maintaining support for high-bit image data
Solution Approach 2:
The patent introduces a new dimension by generating multiple gamma voltages through voltage interpolation using current mirroring and resistor arrays, rather than directly selecting from a large set. This transforms the problem from a high-dimensional selection problem to a lower-dimensional selection plus interpolation problem
2Adaptability or versatility
If the number of gamma voltages increases to process more bits of image data, then the processing capacity improves, but the complexity of the digital-to-analog converter increases
Solution Approach 1:
The patent divides the image data into upper bits and lower bits, processing them through separate selecting circuits. This segmentation allows each circuit to handle fewer voltages, reducing individual circuit complexity while maintaining overall processing capacity for high-bit image data
Solution Approach 2:
The patent implements dynamic voltage generation through current mirroring and resistor arrays that can interpolate gamma voltages. This dynamic approach allows the system to generate required gamma voltages on-demand rather than maintaining a large static set of voltage selection paths, reducing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the area occupied by the digital-to-analog converter while maintaining image data processing capacity by generating gamma voltages through current mirroring and resistor arrays, thereby minimizing the number of selecting elements required.
Implementation Method 1
a bias unit configured to supply a bias current to the second voltage generating unit by generating a reference current and mirroring the reference current to the second voltage generating unit
Implementation Method 2
the second voltage generating unit may include a plurality of resistor arrays, may increase the second gamma reference voltage through one resistor array, and may reduce the second gamma reference voltage through another resistor array
Data Source
AI summary
An embodiment is disclosed that makes it possible to reduce the area of a digital-to-analog converter circuit by interpolating one reference voltage and generating a plurality of gamma voltages.