Gamma Voltage Debugging for Electroluminescent Displays
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Solution Overview
Problem
The existing gamma voltage debugging methods for electroluminescent display devices are lengthy and unsuitable for mass production due to errors caused by luminance decay and the complexity of measuring multiple parameters, requiring a more efficient and accurate process.
Innovation Solution
A method and apparatus that involve turning on sub-pixels to a maximum luminance value, calculating reference current values using a preset formula, and recording driving voltage values corresponding to each gray scale, allowing for precise adjustment and conversion of data into a hardware description language for a timing controller, simplifying the debugging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a luminance meter is employed to monitor luminance during gamma voltage debugging, then measurement accuracy is improved, but device complexity and debugging time increase
Solution Approach 1:
The patent extracts the luminance detection function from the debugging process by using the electroluminescent element's own luminance characteristic as the measurement basis. Instead of introducing an external luminance meter, the system utilizes the inherent relationship between driving voltage and luminance output, thereby eliminating the need for complex external measurement equipment while maintaining debugging functionality.
Solution Approach 2:
The electroluminescent element serves itself as the measurement object. By monitoring the driving voltage required to achieve specific luminance levels (through the element's own emission), the system performs self-diagnosis and self-calibration, eliminating the need for external measurement devices and simplifying the overall debugging apparatus.
2Measurement precision
If luminance and voltage are measured and recorded simultaneously, then measurement synchronization is improved, but errors due to luminance decay increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing the gamma voltage lookup table through theoretical calculation based on the power law relationship (L = aV^b). Instead of performing simultaneous measurement during debugging, the system pre-calculates the required voltages for desired luminance levels and stores them in a lookup table, eliminating the need for real-time measurement and avoiding luminance decay errors entirely.
Solution Approach 2:
The patent replaces the mechanical measurement system (luminance meter and simultaneous recording apparatus) with a computational system. By using the known power law relationship between luminance and driving voltage, the system calculates the required voltages mathematically and stores them in a lookup table, substituting physical measurement with mathematical computation to eliminate measurement errors.
3Manufacturing precision
If many parameters are measured during gamma voltage debugging, then debugging comprehensiveness is improved, but debugging time increases
Solution Approach 1:
The patent extracts only the essential parameter (driving voltage) needed for gamma voltage debugging by utilizing the power law relationship between luminance and voltage. Instead of measuring multiple parameters (luminance, voltage, current, etc.), the system directly calculates and measures only the driving voltage required to achieve specific luminance levels, significantly reducing measurement time while maintaining debugging comprehensiveness.
Solution Approach 2:
The patent changes the measurement approach from direct luminance measurement to driving voltage measurement based on the power law relationship (L = aV^b). By measuring voltage instead of luminance and using the known mathematical relationship, the system achieves the same debugging goal with faster measurement speed and simpler equipment, transforming a time-consuming multi-parameter measurement into a single-parameter voltage measurement.
Data Source
AI summary
A gamma voltage debugging method for an electroluminescent display device, including: turning on sub-pixels in a test region to a maximum luminance value, and recording a driving current of an electroluminescent element at this time as a maximum reference current; calculating reference current values corresponding to respective gray scales according to the maximum reference current and a preset formula; and driving the sub-pixels in the test region to emit light, and for each driving current equal to a reference current value, recording a driving voltage value corresponding to the gray scale value as a gamma voltage resulted from the debugging.