Shift Register Pulse Width Modulation for Narrow Frame Displays
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Solution Overview
Problem
As display panels increase in size and resolution, the scanning time for pixel cells decreases, leading to insufficient charging, which is addressed by overlapping scanning signals between adjacent rows, but this increases the complexity and area required for the gate driving circuit, making it difficult to achieve a narrow frame.
Innovation Solution
A shift register unit with a pulse width modulation module that adjusts pre-charge time without increasing the circuit area, using submodules to control and output signals, allowing for an overlapped region between pulse signals from adjacent stages, enabling efficient pre-charging of pixel cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scanning signals of adjacent rows are made to overlap to pre-charge pixel cells, then pre-charging capability is improved, but the area for deploying the gate driving circuit is increased
Solution Approach 1:
The patent applies dynamics by making the pulse width of the scanning signal adjustable rather than fixed. The pulse width modulation module allows the scanning signal to have variable pulse widths, enabling the overlapped region between adjacent row scanning signals to be dynamically adjusted. This resolves the contradiction by allowing pre-charging capability to be optimized without proportionally increasing the circuit area, as the pulse width can be tuned to match the actual pre-charging time requirements.
Solution Approach 2:
The patent changes the parameter of pulse width to resolve the contradiction. By introducing a pulse width modulation module that can adjust the pulse width of the scanning signal, the system can control the width of the overlapped region between adjacent row scanning signals. This parameter change allows the same circuit area to achieve different pre-charging capabilities by simply adjusting the pulse width parameter.
2Reliability
If the width of the overlapped region is increased to extend pre-charge time, then pre-charging capability is improved, but more clock signals are required and circuit complexity is increased
Solution Approach 1:
The patent applies universality by designing a single pulse width modulation module that can control multiple aspects of the scanning signal. The module integrates the functions of pulse width adjustment, signal generation, and timing control into one unified structure. This multi-functional design allows the system to achieve extended pre-charging capability without proportionally increasing circuit complexity, as the same module handles multiple control tasks.
Solution Approach 2:
The patent uses parameter changes by adjusting the pulse width parameter through the pulse width modulation module. Instead of increasing circuit complexity to extend pre-charge time, the system simply changes the pulse width parameter, which directly controls the overlapped region width and pre-charging capability. This parameter-based approach avoids adding more clock signals or complex circuit structures.
3Productivity
If frame rate is increased to improve display performance, then display quality is improved, but scanning time for pixel cells is reduced leading to insufficient charging
Solution Approach 1:
The patent applies preliminary action by using the overlapped region between scanning signals of adjacent rows to pre-charge pixel cells before the main scanning process. The pulse width modulation module enables this pre-charging to occur in advance, ensuring that pixel cells are fully charged before the frame display begins. This preliminary charging action allows the system to maintain high frame rates while ensuring sufficient charging time for pixel cells.
Solution Approach 2:
The patent changes the pulse width parameter to resolve the contradiction between frame rate and charging sufficiency. By adjusting the pulse width of the scanning signal through the pulse width modulation module, the system can extend the effective charging time within each scanning cycle. This parameter adjustment allows high frame rates to be achieved while maintaining adequate charging time, as the pulse width can be optimized to provide sufficient pre-charging without reducing the overall frame rate.
Data Source
AI summary
A shift register unit having a pulse width modulation module is provided. The pulse width modulation module includes a first input submodule, a first pull-down submodule, a second input submodule, a second pull-down submodule, a third input submodule, and a third pull-down submodule.