Display Pixel Circuit Back Bias Electrode Color Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display apparatuses face challenges in achieving optimal color accuracy and brightness while maintaining portability and low power consumption, particularly in CRT displays, which are bulky and power-intensive.
Innovation Solution
The display apparatus incorporates a pixel circuit with a color accuracy enhancement transistor and a brightness boosting transistor, allowing for mode selection between color accuracy and high brightness modes, utilizing a back bias electrode to adjust the driving current and improve image quality and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a back bias electrode is added to the drive transistor, then color accuracy and brightness are improved, but device complexity increases
Solution Approach 1:
The back bias electrode is nested within the existing pixel circuit structure, integrating the color accuracy enhancement function into the drive transistor without requiring a completely separate circuit. The electrode is positioned between the gate electrode and the active pattern, utilizing existing structural layers to minimize additional complexity.
Solution Approach 2:
The back bias electrode serves multiple functions: it improves color accuracy by adjusting the driving current characteristics, enhances brightness control, and maintains compatibility with existing transistor structures. This multi-functional element resolves the contradiction by providing multiple benefits from a single added component.
2Adaptability or versatility
If mode selection circuitry is added for switching between color accuracy mode and high brightness mode, then adaptability is improved, but device complexity increases
Solution Approach 1:
The pixel circuit incorporates dynamic switching capability through mode selection circuitry that can transition between color accuracy mode and high brightness mode. The switching is controlled by signal lines that activate or deactivate the back bias electrode based on display requirements, enabling adaptability without permanent structural complexity.
Solution Approach 2:
The mode selection circuitry is pre-configured with control logic and signal lines that enable rapid switching between modes. The back bias electrode is pre-positioned and connected to control signals, allowing immediate mode transitions without requiring complex real-time adjustments or additional processing steps.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A display apparatus includes a plurality of pixels, each of the pixels including an organic light emitting diode, a first transistor providing a driving current to operate the organic light emitting diode, a second transistor including a (GEb) rode that receives a first scan signal, a first electrode that receives a data signal, and a second electrode electrically connected to the first electrode of the first transistor, a storage capacitor including a first electrode receiving a first power voltage and a second electrode electrically connected to the gate electrode of the first transistor, and a color accuracy enhancement transistor that applies a first back bias voltage to the first transistor in response to a color accuracy enhancement signal.