Panel Voltage Multiplexing Circuit for Lower OLED Driver Power
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Solution Overview
Problem
Conventional electronic multiplexer circuits in display apparatuses, particularly those used in OLEDs, consume excessive power due to the continuous switching of panel voltages, leading to increased power consumption and heat generation.
Innovation Solution
A multiplexer circuit design that alternately couples data channels to odd and even panel traces, reducing the probability of voltage level switching by maintaining similar panel loads at the output terminals, thereby minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional electronic multiplexer circuit switches even-numbered and odd-numbered pixel columns using multiple data channels, then the display can handle different color pixel circuits, but the power consumption increases due to continuous voltage level switching
Solution Approach 1:
The patent applies universality by making each data channel capable of driving multiple panel traces (both odd-numbered and even-numbered traces) through the multiplexer circuit. Instead of dedicating specific data channels to specific color pixel circuits, any data channel can serve any panel trace by switching the multiplexer's connection configuration. This multi-functional approach reduces the need for multiple voltage switching operations while maintaining the ability to drive different color pixel circuits (first color, second color, third color) across the display panel.
2Productivity
If the multiplexer circuit frequently switches between different data channels for different pixel columns, then the display can be refreshed, but the voltage level switching probability increases causing heat generation
Solution Approach 1:
The patent implements periodic action through the multiplexer circuit's systematic switching pattern. The multiplexer alternates between connecting to odd-numbered panel traces and even-numbered panel traces in a regular periodic manner during horizontal scanning periods. This periodic switching allows the display to be refreshed while maintaining a predictable and optimized switching rhythm that reduces unnecessary voltage transitions. By organizing the switching into regular periods corresponding to the display's scanning structure, the system achieves refresh capability while minimizing random voltage level changes that would generate heat.
Data Source
AI summary
Disclosed are a display apparatus and a panel voltage multiplexing method thereof. The display apparatus includes a source driver, a pixel array, a plurality of panel traces, and a multiplexer circuit. The source driver has a plurality of data channels respectively including output terminals configured to provide panel voltages. The pixel array has first color pixel circuits, second color pixel circuits, and third color pixel circuits in an array. Odd-numbered panel traces of the panel traces are alternately coupled to a portion of the first color pixel circuits and a portion of the second color pixel circuits, and the even-numbered panel traces of the panel traces are coupled to a portion of the third color pixel circuits. Switches of the multiplexer circuit are configured to couple the output of each of the data channels to two odd-numbered panel traces or to two even-numbered panel traces.