Display Panel Power Circuit for Ripple and Inrush Current Control
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Solution Overview
Problem
Display devices that rely on external power supply circuits for power voltage generation suffer from voltage ripples, which can degrade display quality and increase power consumption.
Innovation Solution
An electronic device that selectively uses internal and external power supply voltages, incorporating a voltage generator and power manager connected through a voltage line, with defined operational periods to manage power voltage transitions, including pre-charging and drop voltage phases to stabilize capacitor charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an external power supply circuit is used to generate power supply voltage, then power supply efficiency is improved, but voltage ripples increase
Solution Approach 1:
The power supply function is segmented into two parts: an external power supply circuit for efficient power generation and an internal voltage generator for ripple reduction. The voltage generator divides the power supply voltage into multiple divided voltages, allowing selective application to different pixel circuits based on their needs, thereby resolving the contradiction between efficiency and ripple control.
Solution Approach 2:
Different pixel circuits receive different types of power supply voltage based on their specific requirements. Some pixel circuits receive the original power supply voltage for high efficiency, while others receive divided voltages with reduced ripples for improved display quality. This localized approach allows simultaneous optimization of both efficiency and display performance in different regions of the display panel.
2Use of energy by moving object
If power supply voltage with ripples is applied to pixel circuits, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The pixel circuits are segmented into different groups that receive different voltage types. The voltage generator creates multiple divided voltages from the power supply voltage, allowing certain pixel circuits to receive voltages with reduced ripples for improved display quality while others receive the original efficient power supply voltage, thus balancing display quality and power consumption across the display.
3Stability of the object's composition
If additional blocking circuits are added to manage power voltage transitions, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The voltage generator integrates multiple functions into a single circuit block: it generates divided voltages from the power supply voltage, controls the timing of voltage transitions, and manages the selection of which voltages are applied to which pixel circuits. This merging of functions eliminates the need for separate blocking circuits while maintaining voltage stability and reducing overall device complexity.
Data Source
AI summary
An electronic device includes: a display panel including a pixel; a panel driver configured to drive the display panel in response to a power-on signal; and a power manager configured to apply a power voltage to the panel driver in response to a power voltage start signal, wherein the panel driver includes a voltage generator configured to output a first power voltage to the display panel based on the power voltage, wherein the voltage generator and the power manager are connected through a voltage line, wherein the voltage generator is configured to output a drop voltage to the voltage line in response to a voltage drop start signal, and wherein based on the power voltage being output to the voltage line, voltage generator is configured to output the drop voltage to the voltage line.