Surface lighting device

• US 7,281,816 B2
• Filed: 03/30/2004
• Issued: 10/16/2007
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Suzuki, Toshihiro
• Primary Examiner(s): Ward; John Anthony
• Assistant Examiner(s): MAKIYA, DAVID J
• Application Number:
  US10/812,846
• Publication Number:
  US 20040218388A1
• Time in Patent Office: 1,295 Days
• Field of Search: 362/231, 362623-626, 362/241, 362/243, 362/245, 362/247, 362/252, 362/97, 362/800, 349/67, 257/98
• US Class Current: 362/231
• CPC Class Codes: F21Y 2107/50 on planar substrates or supports, but arranged in different planes or with differing orientation, e.g. on plate-shaped supports with steps on which light-generating elements are mounted
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A surface lighting device including, a surface light source in which light-emitting element groups having three light-emitting elements, which correspond to three primary colors of light, arranged to be continguous with vertexes of a triangle are arranged in a matrix shape; a substrate on which the light-emitting element groups are arranged; and a diffusion plate which is located above the surface light source. the light-emitting element groups are arranged to be deviated every other column or row such that a positional relation among the light-emitting element groups is a delta shape. Additionally, a row interval, a column interval, and an arrangement angle of the light-emitting element groups are adjusted such that, when it is assumed that an average amount of light calculated from a sum of amounts of light of the respective single color light-emitting elements at a center of gravity of the delta shape and a center of gravity of a diamond shape formed by two delta shapes is between 75% and 125%.

Claims

1. A surface lighting device comprising:

a surface light source in which light-emitting element groups having three light-emitting elements, which correspond to three primary colors of light, arranged to be contiguous with vertexes of a triangle are arranged in a matrix shape;

a substrate on which the light-emitting element groups are arranged; and

a diffusion plate which is located above the surface light source,

wherein the light-emitting element groups are arranged to be deviated every other column or row such that a positional relation among the light-emitting element groups is a delta shape, and

a row interval, a column interval, and an arrangement angle of the light-emitting element groups are adjusted such that, when it is assumed that an average amount of light calculated from a sum of amounts of light of the single color light-emitting elements is 100%, a sum of amounts of light of the respective single color light-emitting elements at a center of gravity of the delta shape and a center of gravity of a diamond shape formed by two delta shapes is between 75% and 125%.