Display Data Driver Using Time-Division Gamma Voltage Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The size of data drivers in display devices increases with the number of gamma voltage lines, leading to increased power consumption and complexity, as each additional bit of pixel data doubles the number of gamma voltage lines required.
Innovation Solution
A data driver design that generates 2N gamma voltages and groups them into 2N-M gamma voltage groups, using time-division gamma voltage signals and lines to reduce the number of channels and lines needed, allowing for a spatial and temporal division scheme to select the appropriate voltages, thereby reducing the size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of gamma voltage lines is increased to support higher bit depth pixel data, then the precision of voltage selection is improved, but the area and complexity of the data driver increases
Solution Approach 1:
The patent applies time-division multiplexing to transmit multiple gamma voltage signals through the same physical line at different time periods. During each horizontal period, different gamma voltage groups are sequentially transmitted, allowing high precision voltage selection without requiring proportionally more physical lines, thus resolving the contradiction between precision and area
Solution Approach 2:
The patent makes each gamma voltage line serve multiple functions by transmitting different gamma voltage groups at different time periods. A single physical line can transmit multiple gamma voltages sequentially, making the line universal and reducing the total number of lines needed, thereby reducing data driver area while maintaining voltage selection precision
2Measurement precision
If the number of gamma voltage lines is increased to support higher bit depth pixel data, then the accuracy of data voltage output is improved, but the power consumption increases
Solution Approach 1:
By transmitting multiple gamma voltages sequentially through time-division multiplexing rather than maintaining multiple simultaneous voltage lines, the patent reduces the number of active circuits and signal paths, thereby reducing overall power consumption while maintaining accurate voltage output through temporal separation of voltage groups
3Measurement precision
If the number of gamma voltage lines is increased to support higher bit depth pixel data, then the precision of gamma voltage selection is improved, but the device complexity increases
Solution Approach 1:
The patent uses time-division multiplexing with sequential transmission of gamma voltage groups during different time periods within each horizontal cycle. This temporal organization simplifies the circuit architecture compared to simultaneous multi-line transmission, reducing device complexity while maintaining precise gamma voltage selection through time-based differentiation
Solution Approach 2:
The patent segments gamma voltages into multiple groups that are transmitted sequentially through time-division multiplexing. This segmentation allows the use of simpler circuitry for each time period while achieving high overall precision through the combination of segmented transmissions, thereby reducing device complexity
Data Source
AI summary
A data driver includes a gamma voltage generator configured to generate gamma voltages based on a number of data bits of a pixel data; a first digital-to-analog block configured to generate a plurality of time-division gamma voltage signals respectively corresponding to a plurality of gamma voltage groups; a plurality of time-division gamma voltage line groups for transferring the plurality of time-division gamma voltage signals; a second digital-to-analog block configured to select a time-division gamma voltage signal among the time-division gamma voltage signals according to upper bits of the pixel data in each channel; a time-division gamma voltage select block configured to select a gamma voltage according to lower bits of the pixel data in each channel; and an output buffer block configured to output the selected gamma voltage in each channel.