Display Driving Circuit Amplitude Generation via Transistor Threshold Variation
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Solution Overview
Problem
Existing display units, particularly those using organic electroluminescence (EL) elements, face challenges in generating driving signals with large amplitudes, which is essential for effective pixel driving and image quality.
Innovation Solution
A display unit configuration incorporating a first transistor with a gate, drain, and source, along with a first capacitor connected to one of the transistor's terminals, and a unit pixel driven based on the capacitor's voltage, utilizing a pulse signal applied to the transistor and another pulse signal applied to the capacitor's terminal, effectively generating a driving signal with large amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional drive circuits with shift registers and inverters are used, then the display unit can be operated, but the driving signal amplitude is insufficient for effective pixel driving
Solution Approach 1:
The patent changes the electrical parameters of the drive circuit by replacing conventional inverters with transistors having different threshold voltages. The first transistor has a first threshold voltage and the second transistor has a second threshold voltage that is higher than the first, enabling the generation of large amplitude driving signals through parameter variation rather than structural complexity
Solution Approach 2:
The patent extracts the essential function of signal amplification from complex inverter-based circuits and implements it using a simplified two-transistor configuration. By taking out only the necessary transistors and capacitors, the circuit achieves large signal amplitude generation without the complexity of conventional shift register and inverter structures
2Reliability
If large amplitude driving signals are generated using conventional circuits, then pixel driving is improved, but the circuit complexity and area increase
Solution Approach 1:
The patent merges multiple functions into a compact configuration where the first transistor, second transistor, and capacitor work together in an integrated manner. The first transistor generates the initial signal, the capacitor stores and transfers charge, and the second transistor amplifies the signal to achieve large amplitude output, all within a small area that replaces what would traditionally require multiple separate components
Solution Approach 2:
By utilizing transistors with different threshold voltage parameters, the circuit achieves reliable pixel driving through parameter optimization rather than increased circuit area. The first transistor with lower threshold voltage and second transistor with higher threshold voltage work in conjunction to produce the desired large amplitude signals
Data Source
AI summary
It is an object of the disclosure to generate a driving signal having large amplitude at the time of driving pixels, and there is provided a display unit, a display driving unit, a driving method, or an electronic apparatus that includes: a first transistor (Tr2) including a gate, a drain, and a source; a first capacitor (C2) including a first terminal and a second terminal that is connected to one of the drain and the source of the first transistor; and a unit pixel configured to be driven based on a voltage of the second terminal.