Epson Technology

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Transmittance is a ratio between incident light and outgoing light.
If the light intensity is the same, you can achieve a high luminosity projector using high transmission panels. To gain the same luminosity, you can reduce the power consumption of the lamp using high transmission panels.
A higher apeture ratio allows for higher transmission, which in turn enables the design of energy efficient and eco-considerate products.

Aperture Ratio

The aperture ratio is the ratio between the transparent area, excluding a pixel's wiring area and transistor area (usually hidden by black matrix), and the whole pixel area. As the open area ratio gets higher, the light penetrates more efficiently.
Microfabrication technology and optimization of the wiring and element design improved the aperture ratio by reducing the black matrix area, thus increasing the projector's luminosity.

D5 D7 Aperture Ratio 20% up 0.8inch XGA

Micro Lens Array (MLA)

The LCD panel has a transparent area (opening) and a lightproof area such as the wiring area.
This is a technology that concentrates the light onto the opening to enable as much light as possible to penetrate the panel. Lenses with nearly the same size as a pixel are packed on an incident-side substrate. With this technology, brightness of panels with smaller openings was improved between 1.5 and 1.6 fold.

Incident light of ordinary facing substrates. Incident light against black matrix does not reach pixels. Incident light of facing substrates with MLA. Incident light supposed to be against black matrix is distorted by the lens to reach pixels. Becomes brighter

Optical Compensators

Optical compensators allow a wider viewing-angle for LCD panels, and improve the contrast ratio when used in projectors. The inorganic optical compensator enables a greater transmission ratio by limiting diffusion of light and achieving a higher contrast ratio than before.