Shift Register Unit Random Compensation for OLED Display Defects
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Solution Overview
Problem
Existing gate driving circuits for OLED displays are complex and cannot meet the requirements for high resolution and narrow bezel, and the progressive sequential compensation method can cause display failures such as scanning lines and non-uniform brightness.
Innovation Solution
A shift register unit with a blanking input circuit, a display input circuit, an output circuit, and a compensation selection circuit that allows for random compensation, enabling the avoidance of display defects associated with progressive sequential compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If progressive sequential compensation method is used, then compensation function is achieved, but display defects such as scanning lines and non-uniform brightness occur
Solution Approach 1:
The patent inverts the conventional progressive sequential compensation approach by implementing random compensation. Instead of compensating in a fixed sequential order, the compensation timing is randomized to occur during blanking periods, which prevents the formation of scanning lines and brightness non-uniformity while maintaining the compensation function.
Solution Approach 2:
The patent introduces dynamic compensation timing by using random compensation instead of fixed sequential compensation. The compensation operation is dynamically scheduled during available blanking periods with randomized timing, making the system adaptable and preventing predictable display artifacts.
2Adaptability or versatility
If gate driving circuit is integrated in GATE IC, then circuit integration is achieved, but chip area increases
Solution Approach 1:
The patent merges the gate driving circuit functionality directly into the OLED display panel structure. By integrating the shift register units and compensation circuits within the panel rather than in a separate GATE IC, the design achieves circuit integration while actually reducing the overall chip area required.
Solution Approach 2:
The patent implements multi-functional circuit elements that serve both display driving and compensation functions. The shift register units perform both signal transmission and compensation operations, eliminating the need for separate dedicated compensation circuits and reducing overall chip area.
Data Source
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AI summary
A shift register unit (10), a gate driving circuit (20), a display device (1), and a driving method (1300, 1400). The shift register unit (10) includes a blanking input circuit (100), a display input circuit (200), an output circuit (300), and a compensation selection circuit (400). The blanking input circuit (100) is configured to input a blanking input signal to a control node (H), and input a blanking signal to a first node (Q) in a blanking period of a frame; the display input circuit (200) is configured to input a display signal to the first node (Q) in a display period of the frame in response to a display input signal; the output circuit (300) is configured to output, under the control of a level of the first node (Q), a composite output signal to an output terminal (OUTPUT); and the compensation selection circuit (400) is electrically coupled to the output terminal (OUTPUT), and is configured to charge, in response to a compensation selection control signal, the control node (H) by using the composite output signal. The gate driving circuit (20) configured by the shift register units (10) can perform random compensation on sub-pixel units of a display panel, avoiding display defects caused by long-time progressive sequential compensation.