Shift Register Voltage Range Adjustment for Narrow Border OLED Displays
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Solution Overview
Problem
The existing OLED display technologies require large areas for drive circuits due to separate groups of drive circuits for light emission control and scan signals, which hinders the design of narrow border displays.
Innovation Solution
A shift register with multiple cascaded units, each including a latch circuit, scan switch circuits, and light emission control switch circuits, which share clock signals and output scan and light emission control signals, reducing the area occupied by the shift register and allowing flexible operation across different display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate groups of drive circuits are used for light emission control and scan signals, then the drive circuits can independently control each signal type, but the area occupied by the drive circuits increases significantly
Solution Approach 1:
The patent merges the light emission control drive circuit and scan drive circuit into a single integrated shift register structure. The shift register simultaneously generates both the light emission control signal and the scan signal using shared latch circuits, clock signals, and control switches, thereby reducing the overall area while maintaining independent control capability through sequential signal generation
Solution Approach 2:
The shift register is designed as a universal drive circuit that performs multiple functions: it generates light emission control signals, generates scan signals, and controls both the light emission control transistor and reset transistor. This multi-functional design eliminates the need for separate dedicated drive circuits for each signal type
2Adaptability or versatility
If separate drive circuits are used for each signal, then signal control flexibility is maintained, but the non-display area increases hindering narrow border design
Solution Approach 1:
The shift register is divided into multiple shift register units (first shift register unit, second shift register unit, etc.) that operate in sequence. Each unit contains latch circuits, control switches, and output terminals that generate signals for specific time intervals, enabling flexible control of different pixel rows while maintaining a compact integrated structure
Data Source
AI summary
Provided are a shift register, a display panel, a driving method, and a display device. The shift register includes a plurality of shift register units that are cascaded, where each of the plurality of shift register units includes a latch circuit, at least one scan switch circuit and at least one light emission control switch circuit; where the latch circuit is configured to, in response to a clock signal inputted by a clock signal input, latch an upper-stage shift signal inputted by an upper-stage shift signal input and output the upper-stage shift signal through a lower-stage shift signal output; each of the at least one scan switch circuit is configured to, in response to a lower-stage shift signal outputted by the lower-stage shift signal output, output a scan signal inputted by a scan signal input through a scan signal output.