OLED Pixel Circuit With Shared Data Line to Eliminate Demux Power
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Solution Overview
Problem
Display devices, particularly OLEDs, face increased power consumption due to the inclusion of a demultiplexer (demux) circuit, which is necessary for efficient signal distribution but requires continuous power, posing a challenge in high-resolution and low-power applications like mobile and wearable devices.
Innovation Solution
A display device design that eliminates the demux circuit by using dual-transistor charge transfer transistors with staggered scan signals, allowing adjacent pixels to share a data line, thereby internalizing the demultiplexer function within the pixel circuit and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a demux circuit is used to route data signals to appropriate pixels, then signal distribution efficiency is improved, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates the separate demux circuit from the display system by internalizing its functionality directly into the pixel circuit. The pixel circuit now contains integrated switching elements that perform data signal routing without requiring an external demux circuit, thereby removing the source of excessive power consumption while preserving signal distribution efficiency.
Solution Approach 2:
The patent merges the demux functionality with the pixel circuit by integrating switching elements directly within the pixel structure. This combination allows the pixel circuit to perform both data reception and signal routing functions, eliminating the need for a separate demux circuit and reducing overall power consumption.
2Adaptability or versatility
If a demux circuit is included for efficient signal distribution, then data routing capability is improved, but circuit complexity increases
Solution Approach 1:
The patent combines the demux routing functionality with the pixel circuit by integrating switching elements directly within the pixel structure. This merger maintains data routing capability while reducing overall circuit complexity by eliminating the separate demux circuit and its associated complexity.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions including data reception, signal routing, and pixel control. By making the pixel circuit universal and multi-functional, the patent eliminates the need for dedicated demux circuitry, thereby reducing circuit complexity while preserving routing capability.
Data Source
AI summary
A display device includes a first pixel including a first pixel circuit and a first light emitting element, a second pixel including a second pixel circuit and a second light emitting element, and a data line. The first pixel circuit includes a 1-1st transistor, a 2-1st transistor, and a 3-1st transistor. The 3-1st transistor includes a 1-1st sub-transistor receiving a second scan signal, and a 1-2nd sub-transistor receiving the first scan signal. The second pixel circuit includes a 1-2nd transistor, a 2-2nd transistor, and a 3-2nd transistor. The 3-2nd transistor includes a 2-1st sub-transistor receiving the first scan signal, and a 2-2nd sub-transistor receiving the second scan signal that is delayed by a predetermined time.