公开(公告)号：US20180267227A1

公开(公告)日：2018-09-20

申请号：US15890942

申请日：2018-02-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazumasa Takata ,  Wahei Agemizu ,  Kenji Takamoto

IPC: F21V8/00

CPC classification number: G02B6/0036 ,  G02B6/003 ,  G02B6/0055 ,  G02B6/006 ,  G02B6/0068

Abstract: A display apparatus includes: a light guide plate; a light source that causes light to be incident on an end surface of the light guide plate; a hiding plate that is provided on a side of an emission surface of the light guide plate, and that includes a light transmission part which transmits light emitted from the emission surface and a light shielding part which has lower light transmittance than the light transmission part; and a colored board that has light reflectance closer to light reflectance of the light shielding part than light reflectance of the light transmission part in each wavelength, and that is provided on a side of a reflection surface of the light guide plate so as to overlap the light transmission part of the hiding plate when viewed from a direction perpendicular to the emission surface of the light guide plate.

公开(公告)号：US10345503B2

公开(公告)日：2019-07-09

申请号：US15730703

申请日：2017-10-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazumasa Takata ,  Kenji Takamoto ,  Wahei Agemizu

IPC: F21V8/00 ,  G02F1/01 ,  G06F3/041

Abstract: A display device includes a light guide plate, and light sources allowing light to be incident on a first side surface and a second side surface of the light guide plate. First incidental side surface light from the first light source is reflected to an upper surface side by first reflection parts formed on a bottom surface to display a first pattern, and second incidental side surface light from the second light source is reflected to the upper surface side by second reflection parts formed on the bottom surface to display a second pattern. Slopes are provided at parts of the first side surface and the second side surface of the light guide plate, and light reflected on a facing reflection surface and propagating in the light guide plate again is reduced by the slopes.

公开(公告)号：US10379282B2

公开(公告)日：2019-08-13

申请号：US15426057

申请日：2017-02-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Wahei Agemizu ,  Kazumasa Takata ,  Kenji Takamoto

IPC: F21V8/00

Abstract: A multicolor display apparatus displays a design pattern by reflecting light beams which are incident into a light guide body by arrays of fine shapes and emitting the reflected light beams from the light emission surface, in which, when it is assumed that the gradation values of red, green, blue, and white at a point where a specific color (to be displayed) of the design pattern of the light guide body is displayed using red, green, blue, and white light are set as I(r), I(g), I(b), and I(w), respectively, and when it is assumed that the gradation values of red, green, and blue in the case of displaying a color close to the specific color using only red, green, and blue light without white light are set as Ir, Ig, and Ib, respectively, the fine shapes for each of red, green, blue, and white colors have a height or a pitch which corresponds to the gradation values I(r), I(g), I(b), and I(w) as follows: I(w)=min(Ir, Ig, Ib)×A/100; I(r)=Ir−I(w); I(g)=Ig−I(w); I(b)=Ib−I(w). Here, A/100 is less than 1. Thus, it is possible to realize a beautiful white color and realize display which has high color reproducibility without influence due to a machining error and allows a user to feel beautiful.

公开(公告)号：US10338296B2

公开(公告)日：2019-07-02

申请号：US15890942

申请日：2018-02-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazumasa Takata ,  Wahei Agemizu ,  Kenji Takamoto

IPC: F21V8/00

Abstract: A display apparatus includes: a light guide plate; a light source that causes light to be incident on an end surface of the light guide plate; a hiding plate that is provided on a side of an emission surface of the light guide plate, and that includes a light transmission part which transmits light emitted from the emission surface and a light shielding part which has lower light transmittance than the light transmission part; and a colored board that has light reflectance closer to light reflectance of the light shielding part than light reflectance of the light transmission part in each wavelength, and that is provided on a side of a reflection surface of the light guide plate so as to overlap the light transmission part of the hiding plate when viewed from a direction perpendicular to the emission surface of the light guide plate.