Charge Sharing Circuit for OLED Pixel Initialization
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Solution Overview
Problem
Current organic light-emitting display apparatuses face challenges in reducing power consumption and improving image quality due to limitations in charging and discharging pixel electrodes efficiently.
Innovation Solution
The display apparatus incorporates a charge sharing circuit that connects pixel electrodes between different pixel rows, allowing for the sharing of charges to enhance charging speed and reduce power consumption, while also stabilizing the initialization voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pixel electrodes are charged using conventional methods, then power consumption is high, but charging speed is slow
Solution Approach 1:
The patent merges the charging functions of multiple pixels by connecting pixel electrodes from different pixel rows through a charge sharing circuit. This allows charges to be shared between pixels, enabling faster charging while reducing the total power consumption of the display apparatus.
Solution Approach 2:
The charge sharing circuit acts as an intermediary between pixels in different pixel rows, facilitating charge transfer and sharing. This intermediary structure enables efficient charge distribution without requiring direct connection to power sources for each pixel, thereby reducing power consumption while maintaining fast charging speed.
2Productivity
If pixel electrodes are charged quickly, then image quality improves, but initialization voltage becomes unstable
Solution Approach 1:
The patent applies preliminary action by initializing pixel electrodes in a controlled sequence before charge sharing occurs. The initialization transistors ensure that pixels are properly initialized before charges are shared, maintaining voltage stability even as charging speed increases through the charge sharing circuit.
Solution Approach 2:
The patent implements periodic action through sequential gate signals that control initialization transistors in different pixel rows at different times. This periodic initialization ensures that voltage stability is maintained while allowing rapid charge sharing to occur between properly initialized pixels.
3Use of energy by moving object
If charge sharing is implemented between pixel rows, then power consumption is reduced, but circuit complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display into different pixel rows with dedicated initialization transistors for each row. This segmented structure allows independent control and initialization of each pixel row while enabling charge sharing between rows, reducing power consumption without creating a monolithic complex circuit.
Solution Approach 2:
The charge sharing circuit serves multiple functions: it enables charge transfer between pixels, reduces power consumption, and maintains voltage stability through coordinated control with initialization circuits. This multi-functionality reduces the need for separate circuits for each function, thereby managing complexity while achieving power reduction.
Data Source
AI summary
A display apparatus includes a first pixel positioned in a first pixel row and including a first light-emitting diode and a first initialization transistor connected between a pixel electrode of the first light-emitting diode and an initialization line, a second pixel positioned in a second pixel row and including a second light-emitting diode and a second initialization transistor connected between a pixel electrode of the second light-emitting diode and the initialization line, and a charge sharing circuit including a control transistor connected between the pixel electrode of the first light-emitting diode and the pixel electrode of the second light-emitting diode.