Pixel Driver Voltage Divider for Low-Current Optoelectronics
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Solution Overview
Problem
Existing optoelectronic devices face issues with high static current and increased energy consumption due to the increased number of display pixels and associated electronics, necessitating a more compact pixel driver and optimized control voltage for transistors.
Innovation Solution
A pixel structure incorporating a light-emitting element and a first transistor coupled in series with a variable voltage divider comprising two capacitive branches, allowing for reduced static current and pixel size, featuring a first circuit with a variable voltage divider and switches to control the capacitive branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of display pixels is increased to provide more detailed images, then image quality is improved, but static current and energy consumption increase
Solution Approach 1:
The patent changes the electrical parameters by introducing a variable voltage divider that dynamically adjusts the control voltage applied to the transistor gate. This allows optimization of the transistor operating point to reduce static current consumption while maintaining the required image quality from increased pixel density.
2Adaptability or versatility
If more electronics are added to each pixel to increase display capabilities, then display functionality is improved, but pixel size increases
Solution Approach 1:
The patent merges the voltage control functionality directly into the pixel structure by integrating the variable voltage divider circuit within the pixel boundaries. This consolidation provides enhanced display control capabilities without requiring separate external control circuits, thereby limiting the increase in pixel area.
3Ease of operation
If traditional voltage control circuits are used in pixels, then control simplicity is maintained, but static current consumption is high
Solution Approach 1:
The patent introduces a dynamic voltage control mechanism where the voltage divider ratio can be varied to optimize transistor operation. This dynamic adjustment capability reduces static current consumption compared to fixed voltage control circuits, while the circuit remains relatively simple to implement with basic electronic components.
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 solution reduces static current, simplifies the control circuit, and enables independent calibration of each pixel, achieving homogeneous light emission across the display.
Implementation Method 1
the first circuit comprising a variable voltage divider configured to provide the control voltage on the first terminal, the variable voltage divider comprising two capacitive branches
Data Source
AI summary
A pixel including: a light emitting element and a first transistor coupled in series between a reference node and a supply node; and a first circuit including a first terminal coupled to the control terminal of the first transistor, a second terminal coupled to the reference node, the first circuit being configured to generate a control voltage on the first terminal, the first circuit including a variable voltage divider configured to provide the control voltage on the first terminal; and a first switch coupled between the first terminal of the first circuit and a conductive terminal of the first transistor.