Cascaded Shift Register Signal Stability in Display Driving Circuits
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Solution Overview
Problem
In organic electroluminescent display panels, the arrangement of a separate light-emitting driving IC is necessary for controlling the light-emitting control transistor, which occupies display panel frame area and increases production costs, and the stability of the signal output is poor due to susceptibility to interference from other signals.
Innovation Solution
A display device with a light-emitting driving circuit located in a non-display area, comprising cascaded shift registers connected to pixel circuits through light-emitting control lines, featuring input, node potential control, isolation, and output control circuits to stabilize signal potentials and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate light-emitting driving IC is arranged to control the light-emitting control transistor, then the light-emitting control can be achieved, but the display panel frame area is occupied and production costs increase
Solution Approach 1:
The patent integrates the light-emitting driving circuit directly into the pixel circuit by sharing the driving transistor between the pixel circuit and the light-emitting control circuit. This merging eliminates the need for a separate light-emitting driving IC, thereby reducing the display panel frame area while maintaining light-emitting control functionality
Solution Approach 2:
The driving transistor serves dual functions: it acts as the pixel driving transistor for controlling the pixel circuit and simultaneously serves as the light-emitting driving transistor for controlling the light-emitting control transistor. This multi-functionality reduces the overall transistor count and eliminates the need for additional dedicated driving circuits
2Reliability
If a separate light-emitting driving IC is arranged to control the light-emitting control transistor, then the light-emitting control can be achieved, but production costs increase
Solution Approach 1:
The patent merges the light-emitting driving circuit with the pixel circuit, eliminating the need for a separate light-emitting driving IC. This integration reduces the total component count and simplifies the manufacturing process, thereby reducing production costs while maintaining light-emitting control functionality
Solution Approach 2:
The driving transistor performs multiple functions including pixel driving and light-emitting control, reducing the need for additional components and simplifying the manufacturing process. This multi-functionality approach lowers production complexity and costs
3Device complexity
If a simple shift register is used in the light-emitting driving circuit, then the circuit complexity is reduced, but the signal output stability deteriorates due to susceptibility to interference
Solution Approach 1:
The shift register is divided into multiple stages, with each stage responsible for specific signal processing tasks. This segmentation allows for better signal isolation and reduced interference between different signal paths, improving signal output stability while maintaining manageable circuit complexity
Solution Approach 2:
Isolation circuits are introduced as intermediary elements between different stages of the shift register and between the shift register and the light-emitting control line. These isolation circuits act as mediators that prevent signal interference while maintaining signal transmission, thereby improving signal output stability without significantly increasing overall circuit complexity
Data Source
AI summary
Disclosed is a display device, including a plurality of pixel circuits located in a display area, and a light-emitting driving circuit located in a non-display area and electrically connected to the plurality of pixel circuits; the light-emitting driving circuit includes a plurality of cascaded shift registers; except a last stage of shift register, a signal output terminal of each stage of remaining shift registers is electrically connected to an input signal terminal of a next stage of shift register adjacent thereto; each of the plurality of cascaded shift registers includes: an input circuit, a first node potential control circuit, a second node potential control circuit, a first isolation circuit, a second isolation circuit, a first output control circuit, a second output control circuit, a capacitor circuit, a first output circuit and a second output circuit.