LED Display Pixel Capacitance Variation for Color Synchronization
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Solution Overview
Problem
Display devices using light emitting diodes (LEDs) face challenges in synchronizing the emission timings of red, green, and blue pixels to prevent color distortion, such as purple or magenta appearance in white images, due to differences in capacitance affecting the charging times and emission timing of LEDs.
Innovation Solution
The display device incorporates pixels with capacitors of varying capacitance connected to the power source voltage, allowing for precise control of emission timing by adjusting the capacitance of each capacitor to match the emission times of red, green, and blue LEDs, ensuring synchronized emission across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pixels use the same capacitance value, then the device structure is simple and easy to manufacture, but the emission timings of red, green, and blue LEDs cannot be synchronized due to different parasitic capacitances, causing color distortion
Solution Approach 1:
The patent applies local quality by assigning different capacitance values to capacitors in different pixel types (red, green, blue pixels have different capacitance values). This local differentiation compensates for the different parasitic capacitances of LEDs of different colors, enabling synchronized emission timing and preventing color distortion while maintaining overall system simplicity.
2Reliability
If capacitance values are adjusted to synchronize emission timing, then color distortion is prevented, but the manufacturing process becomes more complex due to varying capacitance requirements
Solution Approach 1:
The patent implements parameter changes by varying the capacitance values of capacitors based on pixel type (red, green, blue). This parameter adjustment compensates for differences in LED parasitic capacitance and emission characteristics, achieving synchronized emission timing across all pixel types while using standard fabrication processes.
3Duration of action of moving object
If larger capacitors are used to ensure sufficient charging time, then emission timing can be controlled, but the pixel area increases reducing display resolution
Solution Approach 1:
The patent applies local quality by optimizing capacitor size locally for each pixel type rather than using a uniform large capacitor for all pixels. This allows sufficient charging time for each LED type while minimizing the area occupied by capacitors, thereby maintaining high display resolution.
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 color distortion by synchronizing the emission timings of red, green, and blue LEDs, enhancing image purity and accuracy in displaying white colors.
Implementation Method 1
a first capacitor including a first electrode connected to a first power source voltage providing a driving voltage to an anode of the first light emitting diode (LED) and a second electrode connected to the anode of the first light emitting diode (LED)
Data Source
AI summary
A display device includes: a first pixel including a first light emitting diode (LED) and a first capacitor including a first electrode connected to a first power source voltage providing a driving voltage to an anode of the first light emitting diode (LED) or to an initialization voltage, and a second electrode connected to the anode of the first light emitting diode (LED); and a second pixel including a second light emitting diode (LED) and a second capacitor including a first electrode connected to the first power source voltage providing the driving voltage to an anode of the second light emitting diode (LED) or to an initialization voltage, and a second electrode connected to the anode of the second light emitting diode (LED), wherein capacitance of the second capacitor is less than capacitance of the first capacitor.