Gate Driver Circuit for OLED Threshold Voltage Compensation
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Solution Overview
Problem
Current OLED display panels face uneven display evenness and threshold voltage shifts due to lack of effective threshold voltage compensation, limiting integration level and increasing production costs.
Innovation Solution
A gate driver circuit with a row pixel controlling unit that compensates for the threshold voltage of driving transistors and controls light-emitting devices, using a pixel driving module with a compensating module connected to a first row scanning signal and a driving module connected to a second row scanning signal and driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a current-controlled mode OLED pixel design is adopted, then the integration level of the OLED display panel is improved, but the display evenness is reduced due to uneven Vth and Vth shift
Solution Approach 1:
The patent merges the threshold voltage compensation function and the pixel driving function into a single integrated pixel structure. The compensation transistor and driving transistor are integrated within the same pixel, allowing simultaneous compensation and driving operations. This integration eliminates the need for separate peripheral compensation circuits while maintaining display evenness through real-time Vth compensation.
Solution Approach 2:
The patent implements preliminary threshold voltage compensation before the pixel driving operation. The compensation phase occurs in advance within the same pixel structure, measuring and compensating for Vth variations before the actual display signal is applied. This preliminary compensation action ensures display evenness is maintained throughout operation.
2Reliability
If a peripheral driver circuit is used for OLED Vth compensation pixel design, then the display evenness is improved, but the production cost increases
Solution Approach 1:
The patent combines the compensation circuit and pixel circuit into a single integrated structure where the compensation transistor, driving transistor, and pixel electrode form one unified pixel unit. This merging eliminates separate peripheral driver circuits, reducing manufacturing complexity and production costs while maintaining the Vth compensation function for display evenness.
Solution Approach 2:
The integrated pixel structure performs multiple functions simultaneously: threshold voltage compensation, pixel driving, and display output. The same pixel structure handles both compensation and driving operations, eliminating the need for dedicated separate circuits and reducing overall manufacturing cost while maintaining display quality.
3Ease of manufacture
If a single-pulse GOA circuit is applied, then the production cost is reduced, but the Vth compensation capability is lost
Solution Approach 1:
The patent merges the GOA circuit functionality with the Vth compensation function in a single integrated pixel structure. The gate driver circuit is directly formed on the array substrate within each pixel, enabling both low-cost GOA operation and effective threshold voltage compensation simultaneously. This integration maintains the cost advantages of GOA while adding compensation capability.
Solution Approach 2:
The integrated pixel circuit performs multiple functions: it operates as a GOA circuit for low-cost manufacturing while simultaneously providing threshold voltage compensation. The same transistor structure handles both driving and compensation operations, achieving multi-functionality that eliminates the trade-off between cost and compensation capability.
Data Source
Figure 1A~1B
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AI summary
The present disclosure provides a gate driver circuit, a gate driving method, a gate-on-array circuit, a display device and an electronic product. The gate driver circuit is connected to a row of pixel unit, each includes a pixel driving module and a light-emitting device connected to each other, the pixel driving module including a driving transistor, a driving module and a compensating module, the compensating module is connected to a first row scanning signal, and the driving module is connected to a second row scanning signal and a driving voltage. The gate driver circuit further includes a row pixel controlling unit configured to provide the first row scanning signal to the compensating module and provide the second row scanning signal and the driving voltage to the driving module, so as to control the compensating module to compensate for a threshold voltage of the driving transistor and control the driving module to drive the light-emitting device. According to the present disclosure, it is able to compensate for a pixel threshold voltage and drive a pixel simultaneously, thereby to improve an integration level.