Patent ID: 9684109
Date: 2017-06-20
CPC Classifications: G02B,G09G

Claim:
1. A light guide plate having a rectangular plate-like shape comprising: a light entrance surface that is one of peripheral surfaces and through which light from a light source enters; a light exit surface that is a plate surface through which the light exits; an opposite plate surface that is a plate surface opposite from the light exit surface; and a light reflection pattern formed on the opposite plate surface for directing the light to exit from the light guide plate through the light exit surface, the light reflection pattern including light reflection portions having distribution densities different from section to section of the opposite plate surface, wherein the sections are defined by at least three columns along a first dimension of the opposite plate surface that is not parallel to the light entrance surface and at least three rows along a second dimension of the opposite plate surface that is parallel to the light entrance surface, the distribution densities in a middle column are higher than the distribution densities in end columns, the distribution densities in a middle row are higher than the distribution densities in the sections in an end low closer to the light entrance surface, and the distribution densities are defined such that a difference between the distribution density in the section in the middle row and each of the end columns and the distribution density in the section in the middle row and the middle column is larger than a difference between the distribution density in the section in the end row and each of the end column and the distribution density in the section in the end row and the middle column, wherein the at least three columns include five columns including a middle column, end columns, and intermediate columns, each of the intermediate rows being located between the middle column and the corresponding end column, the at least three rows include five rows including a middle row, end rows, and intermediate rows, each of the intermediate rows being located between the middle row and the corresponding end row, and the distribution densities are defined such that a difference between the distribution density in each of the sections in each of the end columns and the distribution density in the corresponding section in each of the intermediate column is larger than a difference between the distribution density in each of the sections in the middle column and the distribution density in the corresponding section in each of the intermediate column.