LIGHTING DEVICE AND DISPLAY DEVICE

• Main Authors: YASUNAGA HIROTOSHI, WATANABE HISASHI, MASUDA TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2023
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To effectively suppress brightness unevenness due to a light source even if a positional deviation is generated on an optical sheet.SOLUTION: A backlight device is equipped with a plurality of LED's, and a plurality of optical sheets disposed so as to overlap with a position separated from the plurality of LED's. The plurality of optical sheets are equipped with a first reflection sheet 42A and a second reflection sheet 42B. The first reflection sheet 42A and the second reflection sheet 42B respectively have unit areas X modulating light emitted from the LED's, about each of the plurality of LED's. The unit areas X include modulation areas that are made from first pattern layers 45A and 45B and have a comparatively higher light reflection rate than other areas. The modulation area provided on the first reflection sheet 42A and the modulation area provided on the second reflection sheet 42B are overlapped at least in light source areas L of each other.SELECTED DRAWING: Figure 5 【課題】光学シートに位置ズレが生じたときでも光源による輝度ムラを効果的に抑制する。【解決手段】バックライト装置は、複数のＬＥＤと、複数のＬＥＤから離れた位置に重ねて配置された複数の光学シートと、を備え、複数の光学シートは、第１反射シート４２Ａと、第２反射シート４２Ｂと、を備えている。そして、第１反射シート４２Ａおよび第２反射シート４２Ｂはそれぞれ、複数のＬＥＤのそれぞれについて、当該ＬＥＤから発せられた光を変調させる単位領域Ｘを有し、この単位領域Ｘは、ＬＥＤに対向する光源領域Ｌを含む第１反射パターン層４５Ａ，４５Ｂからなる変調領域であって、他の領域よりも相対的に光の反射率の高い変調領域を含む。第１反射シート４２Ａに設けられた変調領域と、第２反射シート４２Ｂに設けられた変調領域とは、少なくとも互いの光源領域Ｌにおいて重畳されている。【選択図】図５