Light-emitting Driving Circuit for Low Gray Scale Precision
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Solution Overview
Problem
Current light-emitting apparatuses face challenges in accurately displaying low gray scales due to limited fine division of data voltage, leading to deviations from the desired Gamma curve, primarily due to cost and process constraints.
Innovation Solution
A light-emitting driving circuit is designed with a control sub-circuit, data writing sub-circuit, compensation sub-circuit, and driving sub-circuit, which initializes voltages, writes data signals, transmits compensation signals, and adjusts voltages to finely control the driving signal for light-emitting devices, allowing for more precise adjustment of data voltages, especially for low gray scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional driving circuits are used, then device complexity is reduced, but manufacturing precision of gray scale display deteriorates
Solution Approach 1:
The driving circuit is divided into multiple functional sub-circuits: a first sub-circuit for voltage initialization, a second sub-circuit for data signal writing, a third sub-circuit for compensation signal transmission, and a fourth sub-circuit for voltage adjustment. This segmentation allows each sub-circuit to perform a specific function, improving gray scale precision while managing overall circuit complexity through modular design.
Solution Approach 2:
The first sub-circuit performs preliminary initialization of voltages at the first node and control terminal before the main driving operation. This preliminary action ensures that subsequent voltage adjustments and data writing start from a known state, improving the precision of gray scale display.
2Measurement precision
If data voltage division is limited, then device complexity is reduced, but measurement precision of brightness control deteriorates
Solution Approach 1:
The third sub-circuit transmits compensation signals based on feedback from the actual voltage states. The fourth sub-circuit adjusts voltages based on this compensation feedback, enabling precise brightness control through iterative correction rather than requiring complex pre-calculated voltage division circuits.
Solution Approach 2:
The driving circuit performs self-adjustment through the fourth sub-circuit, which automatically modifies voltages based on compensation signals. This self-service mechanism eliminates the need for externally complex voltage division circuits while achieving high precision brightness control.
3Ease of manufacture
If Gamma curve deviation occurs, then ease of manufacture is improved, but object-affected harmful factors increase
Solution Approach 1:
The patent replaces mechanical calibration processes with electronic compensation. Instead of physically adjusting components to achieve Gamma curve accuracy, the system uses electrical compensation signals and voltage adjustments to correct Gamma deviations, maintaining ease of manufacture while eliminating the harmful effect of Gamma curve deviation.
Data Source
AI summary
A light-emitting driving circuit includes a driving sub-circuit, a control sub-circuit, a data writing sub-circuit and a compensation sub-circuit. The control sub-circuit is configured to initialize voltages of a first node and a control terminal of the driving sub-circuit in response to a second scan signal. The data writing sub-circuit is configured to write a data signal into a first terminal of the driving sub-circuit in response to a first scan signal. The driving sub-circuit is configured to output, from a second terminal of the driving sub-circuit, the data signal and a compensation signal. The compensation sub-circuit is configured to transmit the data signal and the compensation signal to the first node in response to the first scan signal, and adjust the voltage of the control terminal according to the data signal, the compensation signal, the initialized voltages of the first node and the control terminal.