Patent ID: 7988310

Claim:
A sheet-shaped lightguide member comprising: a first surface and a second surface that face each other; and a peripheral edge surface; the sheet-shaped lightguide member that receives light entering through at least a part of the peripheral edge surface and guides the light in the sheet-shaped lightguide member to emit the guided light from the first surface; the sheet-shaped lightguide member being divided into at least two light exit areas and further comprising: a light-blocking part provided along a boundary between mutually adjacent ones of the light exit areas to block transmission of light between the mutually adjacent ones of the light exit areas; wherein the light-blocking part comprises a slit provided along the boundary between the mutually adjacent ones of the light exit areas, the slit extending through the sheet-shaped lightguide member from the first surface to the second surface to separate the mutually adjacent ones of the light exit areas from each other, at least a part of a wall surface defining the slit being coated with a light-blocking material that blocks transmission of light between the mutually adjacent ones of the light exit areas.