Source Driver Charge Sharing Circuit Topology
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing source driver technologies face inefficiencies in charge-sharing operations and occupy large chip areas, necessitating a more efficient and compact solution.
Innovation Solution
A novel source driver design incorporating specific switches and buffers, along with capacitors and power rails, optimizes charge-sharing operations by controlling voltage pre-charging and distribution, reducing the number of circuit elements and control signals required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional charge-sharing operation is used in source driver, then power consumption is reduced, but operation efficiency is insufficient and chip area is large
Solution Approach 1:
The patent merges the pre-charge function and charge-sharing function into a single operational phase. The first and second nodes serve dual purposes: they are pre-charged during the pre-charge period and then share charges with the third and fourth nodes during the charge-sharing period. This consolidation eliminates the need for separate circuit paths and control mechanisms, thereby improving operation efficiency while reducing chip area.
Solution Approach 2:
The first and second nodes are designed with multi-functionality. They are pre-charged to specific voltages (first pre-charge voltage and second pre-charge voltage) during the pre-charge period, and then these pre-charged nodes serve as charge sources during the charge-sharing period. This multi-functional design allows the same nodes to perform both pre-charging and charge-sharing operations, reducing the need for additional dedicated components and thus minimizing chip area while enhancing operational efficiency.
2Speed
If pre-charge operation is applied to pixel, then response time is reduced, but additional circuit control is required
Solution Approach 1:
The patent implements preliminary action by pre-charging the first and second nodes to specific voltages before the actual pixel driving operation. During the pre-charge period, the first node is pre-charged to a first pre-charge voltage and the second node is pre-charged to a second pre-charge voltage. This preliminary charging of intermediate nodes enables faster subsequent pixel response without requiring complex real-time control during the pixel driving phase, as the charge is already prepared in advance.
Solution Approach 2:
The first and second nodes act as intermediary elements between the output buffers and the pixel nodes (third and fourth nodes). These intermediary nodes are pre-charged and then share their charge with the pixel nodes during the charge-sharing period. This intermediary mechanism simplifies the control complexity by decoupling the pre-charge control from the pixel driving control, allowing independent optimization of each phase without requiring complex coordinated control circuits.
Data Source
AI summary
A source driver including a first output buffer, a second output buffer and a plurality of switches is provided. The first output buffer is connected to an output line. The second output buffer is connected to another output line. During a charge-sharing period, the first switch and the fourth switch are not conducted, and the second switch, the third switch, the fifth switch and the sixth switch are conducted. A first node, a second node and the output lines are connected together to perform a charge-sharing operation during the charge-sharing period. Based on the circuit structure of the source driver, the efficiency of the charge-sharing operation is improved and the chip area of the source driver is reduced.