Light Emitting Module Capacitor Layout for Voltage Stability
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Solution Overview
Problem
Existing light emitting apparatuses face challenges in maintaining stable power-source voltage due to fluctuations, which affect the performance and image quality, particularly with the miniaturization of bypass capacitors.
Innovation Solution
The efficient arrangement of bypass capacitors between specific power-source voltages, such as PVDD and VSS, closer to current regulation circuits, stabilizes the power-source voltage and reduces fluctuations, thereby preventing image quality degradation while minimizing the size and cost of the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If bypass capacitors are miniaturized to reduce apparatus size, then the size of the light emitting apparatus is reduced, but power-source voltage stability deteriorates due to increased voltage fluctuations
Solution Approach 1:
The patent applies local quality by strategically positioning bypass capacitors in specific locations within the light emitting apparatus. Instead of uniformly distributing capacitors or using a single large capacitor, the invention places multiple capacitors of different values (first bypass capacitor connected to PVDD and second bypass capacitor connected to VSS) at specific locations near the OLED array to locally compensate for voltage fluctuations caused by light emission, thereby maintaining voltage stability while minimizing overall apparatus size
Solution Approach 2:
The patent employs asymmetry by using different capacitor values for the first bypass capacitor (connected to PVDD) and the second bypass capacitor (connected to VSS). The first bypass capacitor has a first capacitance value while the second bypass capacitor has a second capacitance value that is different from the first. This asymmetric configuration optimizes voltage stabilization for each power supply line independently, addressing the different electrical characteristics and fluctuation patterns of PVDD and VSS lines
2Ease of manufacture
If bypass capacitor value is reduced to minimize apparatus size, then manufacturing cost and size are reduced, but image quality deteriorates due to power-source voltage fluctuations
Solution Approach 1:
The patent applies segmentation by dividing the voltage stabilization function into multiple separate bypass capacitors rather than using a single large capacitor. The first bypass capacitor is connected to the PVDD power supply line and the second bypass capacitor is connected to the VSS power supply line. This segmentation allows each capacitor to be optimized for its specific function and location, improving voltage stabilization effectiveness while using smaller individual capacitor values that reduce overall apparatus size and manufacturing cost
Solution Approach 2:
The bypass capacitors act as intermediary elements between the power supply lines and the OLED array. By introducing these capacitive intermediaries, voltage fluctuations are absorbed and smoothed before reaching the OLEDs, preventing image quality deterioration. The capacitors serve as buffer elements that mediate the electrical relationship between the power supply circuitry and the light-emitting elements
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 configuration ensures stable power-source voltage supply, preventing image quality deterioration and reducing the size of the light emitting apparatus without increasing costs, thus enhancing performance and efficiency.
Implementation Method 1
a capacitor to which the first power-source voltage and the second power-source voltage are supplied
Data Source
AI summary
A light emitting apparatus having first side; a second side opposed to the first side; and a third side, to which a first and a second power-supply voltages are supplied; a light emitting region including a plurality of light emitting elements in rows and a plurality of driving circuits for driving corresponding light emitting elements; a plurality of pads disposed in a region between the first side and the light emitting region, each of the pads configured to connect to a terminal arranged in an outside of the light emitting apparatus; and a capacitor element to which the first power-source voltage and the second power- source voltage are supplied, the capacitor element being disposed in a region between the second side and the light emitting region.