Organic Electroluminescent Device Gray Scale Discharge Control
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Solution Overview
Problem
Existing organic electroluminescent devices struggle to accurately control the discharge level according to gray scale, leading to inconsistent light brightness and increased power consumption when transitioning from high to low gray scale.
Innovation Solution
The introduction of a control circuit that detects gray scale levels and adjusts the discharge level by controlling variable resistances in the discharging circuit, allowing for precise regulation of discharge levels corresponding to display data, thereby ensuring consistent light emission across varying gray scales without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed discharge level is used in the discharging circuit, then the circuit structure is simple, but the light brightness becomes inconsistent and power consumption increases when transitioning from high to low gray scale
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed discharge level with a variable discharge level that can be dynamically adjusted according to gray scale information. The control circuit receives gray scale data and adjusts the discharge level accordingly, making the discharging circuit adaptive rather than static. This resolves the contradiction by allowing the circuit to maintain simple operation while achieving consistent light brightness across different gray scales.
Solution Approach 2:
The patent implements parameter changes by modifying the discharge level parameter based on gray scale information. The control circuit changes the discharge level parameter dynamically - using a first discharge level for high gray scales and a second discharge level for low gray scales. This parameter adjustment ensures that the data line discharge is optimized for each gray scale condition, maintaining brightness consistency without increasing circuit complexity.
2Device complexity
If a fixed discharge level is used in the discharging circuit, then the circuit design is simple, but power consumption increases when emitting light at low gray scale
Solution Approach 1:
The patent applies parameter changes by adjusting the discharge level parameter based on gray scale requirements. For low gray scales, a higher second discharge level is used to ensure sufficient current overshooting and prevent insufficient brightness. For high gray scales, a lower first discharge level is sufficient. This dynamic parameter adjustment optimizes power consumption for each operating condition while maintaining the same simple circuit structure.
Solution Approach 2:
The patent implements feedback by using gray scale information as feedback input to the control circuit. The control circuit receives gray scale data and uses it to determine the appropriate discharge level, creating a closed-loop control system. This feedback mechanism ensures that the discharge level is optimally adjusted based on actual display requirements, reducing unnecessary power consumption while maintaining circuit simplicity.
3Use of energy by moving object
If the pre-charge current is not sufficiently overshooting for low gray scale, then the power consumption is reduced, but the light brightness is insufficient
Solution Approach 1:
The patent applies preliminary action by performing a discharge operation before the pre-charge operation. The discharge circuit discharges the data line to a predetermined level before the pre-charge current is applied. This preliminary discharge action ensures that when the pre-charge current flows, it creates sufficient current overshooting even for low gray scales, guaranteeing adequate light brightness while allowing the pre-charge current to be optimized for energy efficiency.
Data Source
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AI summary
The present invention relates to an organic electroluminescent device and driving method thereof. The method of driving an electroluminescent device having a plurality of pixels formed on emitting areas crossed by data lines and scan lines comprises detecting a gray scale of a data current according to a display data inputted from outside, and discharging the data lines to a discharging level corresponding to the display data according to the detected gray scale. The organic electroluminescent device and driving method thereof according to the present invention can emit the pixels as desired brightness independently of a gray scale by making the discharging circuit regulate the discharge level according to the gray scale.