OLED Display Light Blocking Member for Leakage Current
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Solution Overview
Problem
OLED displays experience luminance deterioration and flickering due to leakage current, which worsens with external light exposure, making low-frequency driving difficult to implement effectively.
Innovation Solution
The OLED display incorporates a light blocking member covering the compensation transistor to prevent external light from entering, thereby reducing current leakage and maintaining luminance stability, allowing for low-frequency and low-voltage operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the OLED display is driven at low frequency to reduce power consumption, then energy efficiency is improved, but luminance fluctuation and flickering increase
Solution Approach 1:
The compensation transistor performs preliminary compensation of threshold voltage variations before the OLED emits light. By compensating for voltage changes in advance and storing the compensated voltage in the storage capacitor, the display maintains stable luminance even during low-frequency driving periods when the OLED is not actively emitting light.
2Illumination intensity
If external light exposure is increased for better visibility, then display visibility is improved, but leakage current in compensation transistor increases causing luminance deterioration
Solution Approach 1:
The storage capacitor acts as an intermediary between the compensation transistor and the OLED. It stores the compensated voltage and supplies it during the emission period, isolating the OLED from direct influence by external light-induced leakage current in the compensation transistor, thereby maintaining stable luminance.
3Adaptability or versatility
If the compensation transistor is exposed to external light for ambient adaptation, then environmental adaptability is improved, but voltage across capacitor increases causing luminance deterioration
Solution Approach 1:
The compensation transistor performs preliminary compensation of threshold voltage variations before the OLED emits light. By compensating for voltage changes in advance and storing the compensated voltage in the storage capacitor, the display maintains stable luminance even during low-frequency driving periods when the OLED is not actively emitting light.
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
This solution effectively prevents luminance deterioration and flickering, enabling the manufacturing of OLED displays that can be driven with low frequency and low voltage, improving display quality and reliability.
Implementation Method 1
a light blocking member covering the compensation transistor
Implementation Method 2
Electrons injected from a cathode electrode and holes injected from an anode electrode are bonded to each other in the organic light emitting layer to form excitons. Light is emitted while the excitons discharge energy.
Data Source
AI summary
An organic light emitting diode (OLED) display is disclosed. In one aspect, the display includes a scan line transmitting a scan signal, a data line crossing the scan line and transmitting a data voltage, and a driving voltage line crossing the scan line and configured to transmit a driving voltage. The display also includes a switching transistor electrically connected to the scan line and the data line. The display further includes a driving transistor and a compensation transistor. A driving gate electrode and a driving drain electrode are respectively connected to a compensation source electrode and a compensation drain electrode. The display also includes a light blocking layer at least partially covering the compensation transistor and an OLED electrically connected to the driving transistor.