Patent ID: 9091880
Filing Date: 2015-07-28
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device, comprising: a liquid crystal display panel; a light guide plate disposed on a rear surface side of the liquid crystal display panel; a light source disposed on a side face of the light guide plate, the light source emitting light to a display region of the liquid crystal display panel through the light guide plate; a reflective sheet disposed on a rear surface side of the light guide plate; and a reflective sheet moving unit that moves and holds the reflective sheet; wherein the reflective sheet has a reflective portion and a transmissive portion, the reflective portion having a reflectance in reflecting light emitted from the light guide plate back to the light guide plate, the transmissive portion being made of a material that has a reflectance lower than said reflectance of the reflective portion or that does not reflect the light and having a transmittance for light emitted from the light guide plate, wherein the reflective sheet moving unit moves positions of the reflective portion and the transmissive portion behind the display region of the liquid crystal display panel, wherein the reflective sheet is formed in a quadrangular shape, and an edge on at least one side of said sheet has recesses and protrusions, and wherein the reflective sheet moving unit has a gear that engages with the recesses and protrusions on the edge, and by rotating the gear, the reflective sheet is moved in a direction in which the edge with the recesses and protrusions is extended, thereby changing positions of the reflective portion and the transmissive portion behind the display region of the liquid crystal display panel.