Patent ID: 7630037

Claim:
A double-sided backlight unit comprising: a single light guide plate provided between a first liquid crystal display panel adapted to pass one of p-component and s-component of light and a second liquid crystal display panel adapted to pass the other of p-component and s-component of light, the second liquid crystal display panel being positioned opposite to the first liquid crystal display panel and having a larger area than that of the first liquid crystal display panel, the light guide plate being designed to emit light toward both of the first and second liquid crystal display panels; a light-absorbing sheet disposed between the light guide plate and the first liquid crystal display panel to absorb light impinging thereon, the light-absorbing sheet having a light-permeating part aligned with the first liquid crystal display panel in a direction from the light guide plate toward the first liquid crystal display panel to transmit light from the light guide plate to the first liquid crystal display panel; at least one of a first reflective polarizing sheet disposed between the light guide plate and light-absorbing sheet and a second reflective polarizing sheet disposed between the light guide plate and the second liquid crystal display panel, the first reflective polarizing sheet being designed to pass the one of the p-component and s-component of light and reflect the other of the p-component and s-component of light, the second polarizing sheet being designed to pass the other of the p-component and s-component of light and reflect the one of the p-component and s-component of light; and, at least one of a first light-diffusing sheet disposed between the light guide plate and the light-absorbing sheet and a second light-diffusing sheet disposed between the light guide plate and the second liquid crystal display panel.