Programmable Gamma Circuit for Display Data Driver Size Reduction
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Solution Overview
Problem
Conventional data driving devices for display devices are large in size and costly due to the need for separate gamma voltage circuits for each color (R, G, B), leading to increased area occupation and manufacturing costs.
Innovation Solution
A programmable gamma circuit is applied to the gamma voltage circuit, allowing shared components with the channel circuit, reducing the size by generating and outputting color-specific gamma reference voltages during distinct horizontal driving periods, and using a common DAC to generate data voltages for each color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate gamma voltage circuits are used for each color (R, G, B), then color accuracy is improved, but device size increases
Solution Approach 1:
The patent merges three separate gamma voltage circuits (for R, G, B colors) into a single shared gamma voltage circuit. This circuit sequentially generates gamma reference voltages for different colors during different horizontal driving periods, eliminating the need for separate circuits while maintaining color accuracy through time-multiplexed operation.
Solution Approach 2:
The shared gamma voltage circuit is designed to perform multiple functions by generating gamma reference voltages for all three colors (R, G, B) sequentially. The circuit switches between different color channels during different horizontal driving periods, making a single circuit universal for all color requirements rather than requiring dedicated circuits for each color.
2Measurement precision
If separate gamma voltage circuits are used for each color (R, G, B), then color-specific voltage generation is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines three separate gamma voltage circuits into one shared circuit, reducing the total number of components that need to be manufactured and assembled. This merging reduces manufacturing complexity and cost while maintaining the ability to generate color-specific voltages through sequential operation during different horizontal driving periods.
3Adaptability or versatility
If separate gamma voltage circuits are used for each color (R, G, B), then voltage generation capability is improved, but device complexity increases
Solution Approach 1:
The shared gamma voltage circuit achieves versatility in voltage generation for all colors by implementing time-multiplexed operation. During different horizontal driving periods, the same circuit generates gamma reference voltages for R, G, and B colors sequentially, eliminating the need for multiple dedicated circuits and thereby reducing device complexity while maintaining full voltage generation capability.
Data Source
AI summary
The present disclosure relates to a data driving device and a panel driving method of the data driving device. More particularly, it relates to a data driving device and a panel driving method of the data driving device in which a programmable gamma circuit is applied to a gamma voltage circuit of the data driving device and some components of a channel circuit are used in common so as to reduce the size of the data driving device.