Sub-Pixel Circuit Layout for Noise-Resistant Grayscale Control
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Solution Overview
Problem
Existing display devices, particularly head-mounted display devices, are sensitive to noise and face challenges in achieving accurate grayscale representation due to the influence of capacitors connected to light emitting elements.
Innovation Solution
A sub-pixel design incorporating specific transistor configurations and capacitors, including NMOS and PMOS transistors, to manage voltage levels and signal states during different operational phases, minimizing the impact of capacitors during emission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If capacitors are connected to light emitting elements for voltage storage, then power supply stability is improved, but noise sensitivity increases due to capacitor influence during emission periods
Solution Approach 1:
The patent extracts the harmful influence of capacitors by introducing a switching mechanism that disconnects the capacitor from the light emitting element during the emission period. The second transistor acts as a switch that opens the circuit between the capacitor and light emitting element, effectively removing the capacitor's noisy influence while maintaining its voltage storage function during non-emission periods.
Solution Approach 2:
The patent applies dynamics by making the capacitor connection state-changing through the second transistor. The capacitor is dynamically connected during initialization and holding periods, then dynamically disconnected during the emission period. This dynamic state change allows the system to benefit from capacitor voltage stability when needed while avoiding noise during emission.
2Measurement precision
If multiple transistors and capacitors are added to manage voltage levels and signal states, then grayscale representation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing each component to serve multiple purposes. For example, the first capacitor serves both as a holding capacitor for voltage and as part of the initialization circuit. The second transistor serves both as a switch to disconnect the capacitor during emission and as part of the initialization path. This multi-functionality reduces the need for separate dedicated components, thereby limiting complexity growth.
Solution Approach 2:
The patent applies preliminary action by performing voltage initialization and capacitor charging during the non-emission period before the emission period begins. The second transistor is activated in advance to connect the capacitor to the light emitting element during initialization, ensuring the capacitor is fully charged and ready to provide stable voltage during the subsequent emission period without requiring complex real-time adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sub-pixel design reduces noise sensitivity and ensures accurate grayscale representation by short-circuiting capacitors during specific phases, enhancing display performance in head-mounted devices.
Implementation Method 1
a light emitting element configured to receive the driving current and emit light
Data Source
AI summary
A sub-pixel includes: a first transistor including a control electrode connected to a first node, the first transistor being connected between a second node and a third node configured to receive a first power voltage, and configured to generate driving current; a first capacitor connected between the first node and the second node; a second capacitor connected between the second node and a fourth node configured to receive an initialization voltage; a second transistor configured to provide a data voltage to the first node in response to a first gate signal; and a light emitting element configured to receive the driving current and emit light, and including a first electrode connected to the fourth node, and a second electrode configured to receive a second power voltage.