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Ordinary LCDs have relatively low brightness. How can we increase the brightness of an LCD?
Release Date:
2024-08-05 00:00
Source:
The typical approach is to incorporate BEF and DBEF into the backlight of our LCD panel to boost brightness. Both BEF and DBEF are composite optical films, constructed by laminating multiple layers. Each of these films serves to enhance luminance.
Color screen structure
BEF is a prism film. Its operating principle is that the upper and lower layers of prism films converge the divergent light emitted by LEDs—after it has passed through the light guide plate and undergone diffusion—into a beam with an angular spread of approximately 70 degrees, thereby increasing brightness at the on-axis viewing angle while reducing the overall viewing angle.
Principle of Brightness Enhancement in Prism Films
DBEF is a thin-film reflective polarizer that works by reflecting light previously absorbed by conventional LCD polarizers, thereby boosting brightness. This enhancement is achieved across the entire viewing angle and in all directions, effectively increasing brightness throughout the LCD’s full viewing range.
Principle of DBEF Incrementalism
A single B.E.F. can boost brightness by roughly 20% to 25% compared to the original level. Two B.E.F.s can be stacked, yielding an additional 40% to 50% in brightness—but this is the upper limit; stacking more than two will have the opposite effect. It can also be used on its own.
A single DBEF sheet can boost brightness by roughly 20% to 30%, but it is typically used in combination with a BEF. There are two main reasons for this: first, due to differences in their light‑enhancing properties, the brightness gain from a standalone DBEF is not significant; second, the cost of a DBEF is considerably higher—about ten times that of a BEF.
Based on the brightness‑enhancing performance and characteristics of the BEF and DBEF, we conclude that the optimal combination is BEF + BEF + DBEF, which is both effective and cost‑efficient.
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