Shift Register Circuit with Independent Voltage Sources
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Solution Overview
Problem
Conventional shift register circuits in display panels suffer from signal coupling issues leading to mura effects and poor sweep signal waveforms with significant ripples and slope drops, necessitating improved designs for pixel and circuit driving.
Innovation Solution
A shift register circuit comprising a driving signal generating circuit, a coupling circuit, and a sweep signal generating circuit, where the driving signal generating circuit receives clock signals, a low voltage source, and a high voltage source to output driving signals, while the sweep signal generating circuit receives a second clock signal and a second high voltage source to produce an oblique waveform sweep signal, with the high voltage sources being electrically independent to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If shift registers are arranged in the circuit layout between pixels, then the display panel size increases, but signal coupling occurs leading to mura effects
Solution Approach 1:
The circuit is divided into separate functional blocks: driving signal generating circuit, coupling circuit, and sweep signal generating circuit. Each block is independently positioned and connected through dedicated pathways, preventing signal coupling between different functional areas while maintaining overall panel functionality.
Solution Approach 2:
A coupling circuit is introduced as an intermediary component between the driving signal generating circuit and the sweep signal generating circuit. This coupling circuit includes a coupling capacitor that selectively couples signals while isolating voltage sources, acting as a mediator that prevents direct signal coupling and mura effects.
2Device complexity
If conventional voltage regulator circuit design is used, then circuit complexity is reduced, but sweep signal waveforms have serious ripples and slope drops
Solution Approach 1:
The voltage source parameters are changed from a single shared voltage source to multiple electrically independent voltage sources (first high voltage source and second high voltage source). Each voltage source is independently controlled to provide stable voltage to its respective circuit block, eliminating ripples and slope drops in the sweep signal waveform while maintaining reasonable circuit complexity.
3Device complexity
If shared high voltage source is used for both driving signal and sweep signal circuits, then device complexity is reduced, but signal interference occurs
Solution Approach 1:
The shared high voltage source is segmented into two electrically independent voltage sources: a first high voltage source for the driving signal generating circuit and a second high voltage source for the sweep signal generating circuit. This segmentation eliminates signal interference between the two circuits while maintaining manageable device complexity through independent voltage regulation.
Solution Approach 2:
The coupling circuit acts as an intermediary that isolates the two voltage sources from each other while still allowing signal transmission. The coupling capacitor in the coupling circuit enables signal coupling between stages while preventing voltage source interference, solving the contradiction between device complexity and signal interference.
Data Source
AI summary
A shift register circuit includes a driving signal generating circuit, a coupling circuit, and a sweep signal generating circuit. The driving signal generating circuit is configured to receive a plurality of first clock signals, a low voltage source, an initial signal, and a first high voltage source so as to output a driving signal. The coupling circuit is coupled to the driving signal generating circuit. The coupling circuit is configured to transmit the low voltage source. The sweep signal generating circuit is coupled to the coupling circuit. The sweep signal generating circuit is configured to receive a second clock signal, the low voltage source, and a second high voltage source so as to output a sweep signal. A waveform of the sweep signal includes an oblique waveform. The first high voltage source and the second high voltage source are electrically independent of each other.