Scan Driving Circuit Compensation Signal Generation for OLED Panels
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Solution Overview
Problem
Conventional Gate Driver On Array (GOA) circuits are unable to provide the necessary compensation signals for OLED pixel circuits, leading to increased production complexity and cost due to the need for external chip manufacturing.
Innovation Solution
A scan driving circuit with a first and second shift register connected to different clock signals and a logic arithmetic device that generates compensation signals with specific wave shapes, utilizing AND, NOT, and OR arithmetic units to produce signals matching the clock and scanning signals, allowing for integration on the array substrate without external chip manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional GOA circuit is used in OLED display, then the manufacturing process is simplified and cost is reduced, but the circuit cannot provide compensation signals required by OLED pixel circuits
Solution Approach 1:
The patent enhances the conventional GOA circuit by integrating a compensation signal generation unit that can generate both scanning signals and compensation signals. The shift register is configured to output scanning signals to scan lines while simultaneously generating compensation signals for pixel circuits, enabling the circuit to perform multiple functions (scanning and compensation) within a single integrated structure, thus resolving the contradiction between manufacturing simplicity and signal provision capability
2Adaptability or versatility
If compensation signals are generated by an external chip, then the required compensation signals can be provided, but the production process becomes complicated and cost increases
Solution Approach 1:
The patent merges the compensation signal generation function with the existing GOA circuit by integrating a compensation signal generation unit directly into the shift register structure. This integration combines multiple functions (scanning signal output and compensation signal generation) into a single circuit block, eliminating the need for separate external chips and reducing production process complexity while maintaining full signal provision capability
3Adaptability or versatility
If compensation signals are generated by an external chip, then the required compensation signals can be provided, but integration level of the TFT-LCD panel is reduced
Solution Approach 1:
The patent integrates the compensation signal generation unit directly into the GOA circuit on the array substrate, merging previously separate functions (scanning and compensation) into a unified integrated circuit. This integration eliminates external chips and increases the integration level of the display panel, while the circuit maintains the capability to provide all necessary compensation signals for OLED pixel circuits
Data Source
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AI summary
A scan driving circuit and a driving method thereof, an array substrate, and a display apparatus are disclosed. The scan driving circuit comprises: a first shift register (11) connected to one group of clock signals (CLKA) having a first clock cycle, and configured to output a first scanning signal (GA) progressively; a second shift register (12) connected to another group of clock signals (CLKB) having a second clock cycle, and configured to output a second scanning signal (GB) progressively; and a logic arithmetic device (13) connected to a first clock signal (CLK1) having a third clock cycle, connected to the first shift register (11) and the second shift register (12), and configured to output compensation signals (SC) of multiple rows; the compensation signal (SC) of any row has a wave shape the same as the first clock signal (CLK1) when a second scanning signal (GB) of a present row is at a first level, and has a wave shape the same as a first scanning signal (GA) of the present row when the second scanning signal (GB) of the present row is at a second level; and the third clock cycle is smaller than the second clock cycle. The scan driving circuit can be implemented by adding an appropriate circuit structure on the basis of the conventional GOA circuit, without manufacturing a driving chip on the external circuit board, so that the manufacturing process can be simplified, the process cost of products can be reduced, and integration level of the OLED panel can be raised.