Pixel Structure with Series-Parallel Reconfiguration for OLED Charging
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Solution Overview
Problem
OLED displays with organic semiconductor heterojunction structures face challenges in realizing a composite function of display and photoelectric conversion due to low photo-generated voltage, making it difficult to charge batteries effectively during non-display operations.
Innovation Solution
A pixel structure comprising at least two pixel circuits and a conduction control circuit that connects the pixel circuits in parallel for display operations and in series for photoelectric conversion, allowing for increased output voltage and efficient energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OLED displays with organic semiconductor heterojunction structures are used for display operations, then display performance is achieved, but photo-generated voltage is too low to effectively charge batteries during non-display operations
Solution Approach 1:
The pixel structure is divided into multiple pixel circuits (first pixel circuit, second pixel circuit, etc.) that can be independently controlled. During photoelectric conversion, these segmented circuits are connected in series to increase output voltage, while during display operations they function independently as traditional OLED pixels
Solution Approach 2:
The patent implements dynamic reconfiguration of pixel circuit connections through conduction control circuits. The connection topology changes from parallel (during display) to series (during photoelectric conversion), allowing the system to adapt its electrical characteristics based on operational mode to resolve the voltage limitation
2Power
If pixel circuits are connected in series to increase output voltage for battery charging, then photoelectric conversion efficiency improves, but display function cannot be performed simultaneously
Solution Approach 1:
The patent implements periodic switching between display mode and photoelectric conversion mode through control signals. During display periods, pixel circuits are connected in parallel; during charging periods, they are connected in series. This temporal separation allows both functions to operate at full capability without interference
Solution Approach 2:
The same pixel circuit structure serves dual purposes: as light-emitting display elements when connected in parallel, and as photoelectric conversion elements when connected in series. The organic semiconductor heterojunction structure inherently supports both electroluminescence and photovoltaic effects, enabling one component to perform multiple functions
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
Enables the pixel structure to perform both display and photoelectric conversion functions, increasing the charging voltage for batteries and extending the device's operational time without affecting display performance.
Implementation Method 1
each of the first light emitting device light emitting device and the second light emitting device is configured to emit light in a case where a positive bias is applied
Implementation Method 2
to convert received optical energy into electrical energy in a case where a zero bias voltage or a negative bias voltage is applied
Data Source
AI summary
A pixel structure and a method of driving the same, a display panel and a display device. The pixel structure includes: at least two pixel circuits and a conduction control circuit connected to the at least two pixel circuits. The conduction control circuit is configured to connect the at least two pixel circuits in parallel in response to a first control signal and to connect the at least two pixel circuits in series in response to a second control signal.