Shift Register with Varying Duty Ratio Signals
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Solution Overview
Problem
Current OLED and micro-LED display technologies require two separate shift registers to generate control signals at different voltage levels, which complicates routing and reduces production efficiency due to the need for signal lines to cross active areas with through holes or openings, thereby hindering product yield and speed.
Innovation Solution
An electronic device with shift registers that output multiple control signals with varying duty ratios, where a part of the shift registers are symmetrically disposed on both sides of the active area, using a first output circuit, a voltage-stabilizing control circuit, and an input circuit to generate signals, allowing for the generation of control signals at different voltage levels without the need for separate shift registers on opposite sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate shift registers are used to generate control signals at different voltage levels, then the control signals can be properly generated, but the circuit complexity increases and routing becomes more difficult
Solution Approach 1:
The patent combines two separate shift registers into a single integrated shift register that generates multiple control signals (first control signal, second control signal, and third control signal) with different duty ratios. This merging eliminates the need for separate shift registers while maintaining the ability to provide proper control signals at different voltage levels, thereby reducing circuit complexity without sacrificing reliability
Solution Approach 2:
The single shift register is designed to perform multiple functions by generating different control signals with varying duty ratios. The shift register can output first control signals with a first duty ratio, second control signals with a second duty ratio, and third control signals with a third duty ratio, all from a single device. This multi-functionality replaces what previously required two separate shift registers
2Reliability
If two separate shift registers are located at opposite sides of the display, then different control signals can be generated, but the signal routing becomes more difficult due to through holes or openings in the active area
Solution Approach 1:
By merging two separate shift registers into one, the patent eliminates the need for complex signal routing across the active area. The single shift register can be positioned in a location that simplifies routing, and all necessary control signals are generated from this one location, avoiding the need for signal lines to cross through holes or openings in the active area
Solution Approach 2:
The patent employs asymmetric duty ratios for different control signals (first duty ratio, second duty ratio, and third duty ratio are all different) while using a single symmetric shift register structure. This allows the shift register to generate differentiated control signals without requiring asymmetric placement of multiple shift registers at opposite sides of the display
3Reliability
If multiple shift registers are used to generate control signals, then the control signals can be provided, but the production yield and speed are reduced
Solution Approach 1:
The patent merges multiple shift register functions into a single shift register device, reducing the total number of components that need to be manufactured and assembled. This consolidation improves production yield by reducing the number of potential failure points and speeds up the manufacturing process by requiring fewer fabrication steps and assembly operations while still providing all necessary control signals
Data Source
AI summary
An electronic device includes an active area and multiple shift registers. The active area comprises multiple pixel circuits. Each of the multiple shift registers is configured to output a first control signal, a second control signal, and a third control signal to a part of pixel circuits of the multiple pixel circuits. A duty ratio of the third control signal is greater than a duty ratio of the second control signal, and the duty ratio of the second control signal is greater than a duty ratio of the first control signal. A part of the multiple shift registers and other part of the multiple shift registers are substantially symmetrically disposed at two sides of the active area, respectively.