Series Pixel Driving Circuits for Simultaneous Light Emission
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Solution Overview
Problem
Conventional LED displays with passive matrix driving face challenges in ultra-fine pitches, including complex circuit layouts, high power requirements, and strobe problems due to high switching rates, which are exacerbated by the need for multiple layers of printed circuit boards and inefficient light emission timing.
Innovation Solution
The implementation of active matrix displays with pixel driving circuits connected in series, where each control circuit is directly connected to a light emitting circuit, allowing for simultaneous light emission and reducing current requirements, thereby simplifying circuit design and reducing strobe issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If passive matrix driving is used to control pixel brightness and scale, then the display can be implemented with conventional LED technology, but the circuit layouts become complicated and require multiple layers of PCB when ultra-fine pitches are required
Solution Approach 1:
The display is divided into multiple scanning zones, with each zone having its own driving circuit. This segmentation allows each circuit to control a specific region, reducing the overall circuit complexity while achieving ultra-fine pitch requirements through localized control
Solution Approach 2:
The patent introduces a time dimension by using sequential scanning across multiple zones. Instead of controlling all pixels simultaneously in a single plane, the system scans through different spatial zones in sequence, effectively adding a temporal dimension to the spatial control problem and reducing circuit complexity
2Device complexity
If passive matrix scanning is used to drive LEDs, then the display can be implemented with simpler circuits, but high switching rates are required which cause strobe problems
Solution Approach 1:
By dividing the display into multiple scanning zones with dedicated driving circuits, each circuit operates at a lower switching rate within its zone. This segmentation distributes the switching burden across multiple circuits, reducing the strobe effect while maintaining overall display functionality
Solution Approach 2:
The patent implements periodic scanning across different zones with controlled duty cycles. Each zone is activated in periodic intervals rather than continuously, which reduces the effective switching rate and minimizes strobe effects while maintaining persistent visual output through persistence of vision
3Productivity
If multiple pixel devices are connected to a single IC, then the display can be driven with fewer ICs, but high IC power is required which increases power consumption
Solution Approach 1:
The display is divided into multiple scanning zones, each with its own driving circuit. This segmentation distributes the power consumption burden across multiple circuits rather than concentrating it in a single high-power IC, reducing overall power consumption while maintaining the ability to drive multiple pixel devices
Solution Approach 2:
By adding the temporal dimension through sequential zone scanning, the system reduces the instantaneous power requirement per IC. Each IC only needs to drive its designated zone during its active period, spreading the total power consumption over time and reducing peak power demands
4Device complexity
If sequential scanning is used to drive pixel devices, then the circuit implementation is simplified, but light emission is not simultaneous which reduces display quality
Solution Approach 1:
By dividing the display into multiple zones with dedicated driving circuits, each circuit can control its zone's light emission independently. This segmentation allows for more flexible timing control within each zone, improving the appearance of simultaneity while maintaining circuit implementation simplicity
Solution Approach 2:
The patent uses periodic scanning with optimized duty cycles to create the perception of simultaneous light emission. By carefully controlling the timing and duration of each zone's activation, the system achieves near-simultaneous visual output across all zones while maintaining simple sequential circuit implementation
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 reduces circuit complexity, lowers power consumption, and improves display quality by allowing for flexible light emission control and simultaneous light output from multiple pixels, addressing the limitations of passive matrix displays.
Implementation Method 1
a first light emitting circuit coupled to the first control circuit and configured to emit light according to the first light emitting signal
Data Source
AI summary
A display includes first and second pixel devices. The first pixel device includes a first control circuit and a first light emitting circuit. The first control circuit generates a first light emitting signal according to a first clock signal and a data signal during a first period. The first light emitting circuit emits light according to the first light emitting signal during second and third periods. The second pixel device includes a second control circuit and a second light emitting circuit. The second control circuit generates a second light emitting signal according to a second clock signal and the data signal during the second period. The second light emitting circuit is coupled to the second control circuit and emits light according to the second light emitting signal during the third period. The first period to the third period are arranged continuously in order.