LED Display Module with Shared Bias and Time-Multiplexed Control
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Solution Overview
Problem
Existing image display devices with integrated LED and control chips face challenges in optimizing the size and efficiency of the control circuit, particularly in multi-view display devices where individual control of multiple LEDs is required for different viewing angles.
Innovation Solution
A monolithic module architecture with shared bias circuits and time-multiplexed control signals is employed, allowing for compact control circuits and efficient individual control of LEDs, utilizing CMOS circuits and time-multiplexing techniques to reduce the number of connection terminals and enhance quantum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individual control circuits are provided for each LED in multi-view display devices, then individual control capability is achieved, but control circuit size and device complexity increase
Solution Approach 1:
The patent combines multiple LED control functions into a single integrated control circuit that can individually control multiple LEDs through time-multiplexed signal transmission. The control circuit integrates bias current generation, signal multiplexing, and individual LED control capabilities, thereby reducing overall device complexity while maintaining individual control capability for multi-view display applications.
Solution Approach 2:
The patent employs time-multiplexed control signals that periodically switch between different LEDs. By sequentially activating different LEDs at different time intervals within a frame period, the control circuit achieves individual control of multiple LEDs using a single control pathway, significantly reducing circuit complexity compared to providing separate control circuits for each LED.
2Measurement precision
If the number of connection terminals is increased to control multiple LEDs, then control precision is improved, but manufacturing complexity and device size increase
Solution Approach 1:
The control circuit is designed as a universal multi-functional unit that can control multiple LEDs through a single set of connection terminals. The circuit incorporates a multiplexer that routes control signals to different LEDs based on time-multiplexing, allowing the same terminals to serve multiple control functions throughout the frame period, thereby reducing the total number of terminals required while maintaining precise individual control.
Solution Approach 2:
The patent transitions from spatial multiplexing (requiring separate terminals for each LED) to temporal multiplexing (using time slots for different LEDs). By adding the time dimension to the control signal transmission, the system achieves individual LED control precision without increasing the spatial dimension of connection terminals, effectively reducing terminal count while maintaining control accuracy.
3Stability of the object's composition
If bias current is continuously applied to LEDs, then LED stability is maintained, but power consumption increases
Solution Approach 1:
The control circuit implements periodic bias current application synchronized with the time-multiplexed LED activation. Bias current is applied only during the specific time intervals when each LED is actively emitting, rather than continuously. This periodic biasing maintains LED stability during active periods while minimizing power consumption during inactive periods, achieving an optimal balance between stability and energy efficiency.
Solution Approach 2:
The circuit maintains continuous useful action by ensuring that bias current is applied continuously during the brief emission windows of each LED, providing stable light output when needed. The apparent discontinuity in bias current application is compensated by the high-speed switching and persistence of vision effects, maintaining perceived image continuity while reducing overall power consumption through targeted current application only during emission intervals.
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
This approach minimizes the control circuit size, optimizes the number of connection terminals, and enhances the external quantum efficiency of LEDs by adjusting bias currents and emission times, thereby improving the display performance and reducing power consumption.
Implementation Method 1
an image display device comprising a plurality of elementary electronic chips, which will hereinafter be called elementary modules
Implementation Method 2
Each module comprises one or more LEDs and a control circuit for said one or more LEDs
Data Source
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AI summary
The present description relates to an elementary module (100) of a display device for displaying at least one pixel of an image, the module comprising: - a first set of N LEDs (101(i,j)) distributed in M groups (G(i)), at least one of the M groups comprising at least two LEDs, where N and M are integers, with M greater than or equal to 2; and - a control circuit comprising M biasing circuits (103(i)) associated respectively with the M groups of LEDs, each biasing circuit (103(i)) being shared by the LEDs of the corresponding group (G(i)) and being adapted to successively control the LEDs of the group in emission.