Fast Gamma Settling Circuit for Display Devices
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Solution Overview
Problem
Existing display devices face challenges in rapidly settling gamma voltages, which leads to increased current consumption and slower source line settling times, particularly in high-frequency and high-resolution display operations.
Innovation Solution
The display device incorporates a fast gamma settling circuit (GFS) that includes switches connected between gamma tab point lines and a local tab point line, allowing for rapid gamma voltage settling by generating a local tab and utilizing a data comparison method to minimize additional current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional gamma voltage generation is used, then device complexity is reduced, but gamma voltage settling time increases
Solution Approach 1:
The gamma voltage generation circuit is segmented into multiple gamma lines (first gamma line, second gamma line, etc.) with separate switches for each. This segmentation allows independent control and faster settling of each gamma line by activating only the necessary switches for the current data pattern, reducing overall settling time while managing complexity through modular architecture.
Solution Approach 2:
The patent implements dynamic switching control where switches are selectively activated based on data patterns. The system transitions from a static gamma voltage generation approach to a dynamic one where the number of active gamma lines and switches varies with the data being displayed, enabling faster settling by activating only the necessary circuit elements for each frame.
2Speed
If fast gamma settling circuit is implemented, then gamma voltage settling speed improves, but current consumption increases
Solution Approach 1:
Instead of activating all gamma lines and switches simultaneously (excessive action), the system activates only the necessary number of gamma lines and switches based on the data pattern (partial action). This reduces unnecessary current consumption while maintaining fast settling speed for the active gamma lines, achieving an optimal balance between performance and energy efficiency.
Solution Approach 2:
The system changes the operating parameters by varying the number of active gamma lines and switches based on data patterns. When data changes are detected, the system adjusts the number of active circuit elements dynamically, changing the current consumption parameter to match the actual display requirements and reducing wasted energy during static or low-change periods.
3Manufacturing precision
If more source channels are added for high resolution, then display resolution improves, but source line settling time decreases
Solution Approach 1:
The source channels are segmented into multiple independent gamma lines, each with its own switches and settling control. This segmentation allows the system to manage settling time for each channel independently, enabling high-resolution displays with multiple source channels without suffering from proportional increases in overall settling time, as each gamma line can settle in parallel.
Data Source
AI summary
A display device includes a first gamma line providing a first gamma voltage; a second gamma line providing a second gamma voltage; a local tab point line; a first switch configured to connect the first gamma line to the local tab point line based on a tab division enable signal; and a second switch configured to connect the second gamma line to the local tab point line based on the tab division enable signal.