Display Module Red Light Leak Reduction via Spectral Matching

The patent applies parameter changes by carefully selecting and adjusting the emission spectrum characteristics of the light source. Specifically, it chooses a light source whose emission spectrum has minimal overlap with the green filter's transmittance spectrum in the red light region (600-780nm), while maintaining sufficient brightness. This is achieved by controlling the spectral distribution parameters of the light source to reduce the integral value of the product of emission and transmittance spectra in the red region, thereby eliminating red light leak without sacrificing overall illumination intensity.

The patent converts the potential harm of red light leak into a benefit by using it as a design constraint to optimize the light source selection. Instead of merely adding more aggressive red-blocking filters that would harm green light transmission, the invention uses the red light leak problem as a guiding parameter to select a light source with inherently reduced red emission in the 600-780nm range. This approach simultaneously achieves red light leak reduction and maintains green light transmittance, as the light source itself is tailored to have minimal spectral overlap with the green filter's passband.

The patent applies preliminary action by pre-optimizing the light source emission spectrum before the light reaches the green filter layer. Instead of attempting complex real-time adjustments or post-processing, the invention selects a light source whose emission spectrum is already tailored to have minimal overlap with the green filter's transmittance spectrum in the red region. This preliminary spectral optimization simplifies the overall system design, as it eliminates the need for complex additional filtering or active spectral management, thereby reducing device complexity while achieving high color purity.