Pixel Driving Circuit for Full-Screen Display Integration
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Solution Overview
Problem
The increasing demand for high screen-to-body ratio in display panels, necessitated by integrating sensors like cameras, results in reduced display area due to reserved holes or notched areas, which limits the integration of electronic device functions within the display panel.
Innovation Solution
A pixel driving circuit comprising a micro light-emitting diode and a photoelectric conversion device, with separate driving circuits for display and photosensitive modes, allowing for integrated electronic device functions without reserved areas by switching between light emission and photocurrent generation based on enable signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors such as cameras are integrated into display panels, then the functionality of the display panel is improved, but the display area is reduced due to reserved holes or notched areas
Solution Approach 1:
The pixel is designed to perform multiple functions: in display mode, the light-emitting diode emits light for display; in photosensitive mode, the photoelectric conversion device converts external light into photocurrent for sensor functions. This multi-functionality eliminates the need for separate sensor areas, thereby maintaining full display area while integrating camera functionality.
Solution Approach 2:
The patent merges the display function and photosensitive function into a single pixel structure by integrating both the light-emitting diode and photoelectric conversion device within the same pixel. The switching mechanism allows the pixel to be dynamically assigned to either display or sensor mode, combining previously separate functions into one unified structure.
2Adaptability or versatility
If reserved areas are created for sensors, then sensor integration is enabled, but the screen-to-body ratio is reduced
Solution Approach 1:
Each pixel serves dual purposes: display during normal operation and photosensitive detection when needed. This eliminates the need for dedicated sensor areas (holes or notches), allowing the entire display surface to contribute to both display and sensing functions, thereby maximizing the screen-to-body ratio.
Solution Approach 2:
The pixel's functional state is dynamically switched between display mode and photosensitive mode through control signals that activate either the light-emitting diode or the photoelectric conversion device. This dynamic switching capability allows the same physical area to serve different functions at different times, eliminating the need for permanent reserved areas.
3Adaptability or versatility
If a pixel driving circuit with switching mechanisms is implemented, then mode switching between display and photosensitive modes is enabled, but the circuit complexity is increased
Solution Approach 1:
The pixel driving circuit is segmented into distinct functional blocks: a light-emitting driving circuit with a first switch for controlling the light-emitting diode, and a photosensitive driving circuit with a second switch for controlling the photoelectric conversion device. This segmentation allows independent control of each function while maintaining overall simplicity through modular design.
Solution Approach 2:
The switching between display and photosensitive modes is controlled by periodic enable signals that alternately activate the light-emitting driving circuit and photosensitive driving circuit. This periodic switching mechanism simplifies control logic by using time-division multiplexing, where each function is activated in alternating time slots rather than requiring complex simultaneous control.
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 full-screen display by integrating electronic device functions, such as cameras, into the display panel without specific area reservations, enhancing the screen-to-body ratio by switching between display and photosensitive modes.
Implementation Method 1
a photoelectric conversion device, electrically connected to the micro light-emitting diode through a circuit node and configured to convert external light into a photocurrent
Implementation Method 2
a micro light-emitting diode, configured to emit light for display
Data Source
AI summary
A pixel driving circuit is provided, and the pixel driving circuit includes a light-emitting driving circuit, a photosensitive driving circuit, a micro light-emitting diode, and a photoelectric conversion device, wherein when the pixel driving circuit is in a display mode, the light-emitting driving circuit drives the micro light-emitting diode to emit light for display, and when the pixel drive circuit is in a photosensitive display mode, the photosensitive driving circuit drives the photoelectric conversion device to generate a photocurrent, and when the photocurrent is received by the micro light-emitting diode, the micro light-emitting diode will emit light for display. Functions of electronic devices may be integrated into a display panel to achieve full-screen display.