Source Driver Charge Sharing Bus for Display Power Reduction
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Solution Overview
Problem
The high power consumption of source drivers in display systems, particularly due to the capacitive load on data lines, poses a challenge in reducing battery life in mobile devices without compromising display performance.
Innovation Solution
The implementation of a source driver with charge sharing circuits that allow multiple driving channels to share electric charges through a charge sharing bus and capacitor, reducing power consumption by pre-charging or pre-discharging data lines during the charging phase, thereby minimizing the power required for data voltage output in the driving phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional source driver circuits are used to drive display panel data lines, then display performance can be maintained, but power consumption is high due to capacitive load charging requirements
Solution Approach 1:
The patent implements a charge sharing circuit that pre-charges data lines during a charging phase before the actual driving phase. By performing preliminary charging action in advance, the circuit reduces the power consumption during the main driving operation while maintaining display performance. The charge sharing circuit couples output terminals together to share electric charges, preparing the data lines for upcoming voltage transitions.
Solution Approach 2:
The patent introduces a charge sharing bus as an intermediary component that connects multiple output terminals. This bus acts as a mediator to transfer and share electric charges between different driving channels. The charge sharing capacitor on the bus stores and redistributes charges, enabling efficient power management without directly affecting the display output performance.
2Use of energy by moving object
If charge sharing circuits are added to reduce power consumption, then energy efficiency improves, but device complexity increases due to additional circuit components
Solution Approach 1:
The charge sharing bus serves multiple functions simultaneously: it acts as a charge storage medium, a charge transfer pathway, and a voltage regulation mechanism. By making the bus multi-functional, the patent reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving power consumption reduction through charge sharing.
Solution Approach 2:
The patent merges the charge sharing functionality with the existing data line structure by coupling output terminals together through a shared bus. Instead of adding completely separate charge sharing circuits for each data line, the invention combines multiple functions into a unified charge sharing bus architecture, reducing overall circuit complexity while maintaining power efficiency benefits.
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 significantly reduces power consumption by nearly half, achieving efficient data driving while maintaining display performance, as demonstrated by the adaptive charge sharing function and voltage shift mechanisms.
Implementation Method 1
a charge sharing bus CS_BUS and a charge sharing capacitor CSC coupled to the charge sharing bus CS_BUS
Data Source
AI summary
A source driver includes a plurality of output terminals and a plurality of driving channels. Each of the plurality of driving channels is coupled to an output terminal among the plurality of output terminals and includes an output buffer, an output enable switch and a charge sharing circuit. The output enable switch is coupled between the output buffer and the corresponding output terminal. The charge sharing circuit is coupled to the corresponding output terminal. Wherein, the charge sharing circuits of at least two of the plurality of driving channels are commonly coupled to a charge sharing bus.