Backlight device, liquid crystal display device, and electronic apparatus

A backlight device that supplies illumination light to a transmissive liquid crystal panel, the backlight device comprising:

• a plurality of light source substrates having a plurality of light-emitting elements for emitting the illumination light;
• a reflecting sheet having a first surface, a second surface, and a plurality of openings, the first surface having the plurality of light source substrates provided thereon, wherein the plurality of light source substrates are attached to and held by the first surface of the reflecting sheet, the second surface being disposed opposite to the first surface and reflecting the illumination light emitted from the plurality of light-emitting elements, the openings connecting the first and second surfaces and being disposed in correspondence with the light-emitting elements so as to allow the light-emitting elements to be exposed from the second surface;
• a diffusing-guiding plate provided so as to directly face the second surface of the reflecting sheet at a predetermined distance from the second surface, the diffusing-guiding plate diffusing the illumination light emitted from the light-emitting elements and the illumination light incident from the second surface of the reflecting sheet in an interior of the diffusing-guiding plate;
• and
• an optical-function-sheet layered body that is combined with the diffusing-guiding plate, that includes a plurality of laminated optical function sheets, and that guides the illumination light to the transmissive liquid crystal panel;
• wherein a wiring pattern is disposed in direct contact with surfaces of the light source substrates at a first side of the light source substrates that is furthest from the light-emitting elements, and a heat-dissipating pattern is disposed in direct contact with surfaces of the light source substrates at a second side of the light source substrates that is opposite the first side.

A liquid crystal display device comprising:

• a transmissive liquid crystal panel;
• and
• a backlight device that illuminates the transmissive liquid crystal panel from a rear surface side thereof,
• wherein,
• the backlight device includes a plurality of light source substrates having a plurality of light-emitting elements for emitting illumination light,
• a reflecting sheet having the plurality of light source substrates mounted directly to one surface of the reflecting sheet, the reflecting sheet having an opening formed at a location in correspondence with the light-emitting elements mounted to the light source substrates, the reflecting sheet allowing the light-emitting elements to be exposed at another surface of the reflecting sheet from the opening, and reflecting the illumination light from the light-emitting elements by said another surface,
• a diffusing-guiding plate facing said another surface side of the reflecting sheet at a predetermined interval from the reflecting sheet, the diffusing-guiding plate diffusing in a layer thereof the illumination light incident from the reflecting sheet, and
• an optical-function-sheet layered body that is combined with the diffusing-guiding plate, that includes a plurality of laminated optical function sheets, and that guides the illumination light to the transmissive liquid crystal panel;
• wherein a wiring pattern is disposed in direct contact with surfaces of the light source substrates at a first side of the light source substrates that is furthest from the light-emitting elements, and a heat-dissipating pattern is disposed in direct contact with surfaces of the light source substrates at a second side of the light source substrates, the second side being furthest from the wiring pattern.

A liquid crystal display device comprising:

• a transmissive liquid crystal panel;
• and
• a backlight device that supplies illumination light to the transmissive liquid crystal panel, wherein,
• the backlight device includes a plurality of light source substrates having a plurality of light-emitting elements for emitting the illumination light,
• a reflecting sheet having a first surface, a second surface, and a plurality of openings, the first surface having the plurality of light source substrates provided thereon, wherein the plurality of light source substrates are attached to and held by the first surface of the reflecting sheet, the second surface being disposed opposite to the first surface and reflecting the illumination light emitted from the plurality of light-emitting elements, the openings connecting the first and second surfaces and being disposed in correspondence with the light-emitting elements so as to allow the light-emitting elements to be exposed from the second surface,
• a diffusing-guiding plate provided so as to directly face the second surface of the reflecting sheet at a predetermined distance from the second surface, the diffusing-guiding plate diffusing the illumination light emitted from the light-emitting elements and the illumination light incident from the reflecting sheet in an interior of the diffusing-guiding plate, and
• an optical-function-sheet layered body that is combined with the diffusing-guiding plate, that includes a plurality of laminated optical function sheets, and that guides the illumination light to the transmissive liquid crystal panel;
• wherein a wiring pattern is disposed in direct contact with surfaces of the light source substrates at a first side of the light source substrates that is furthest from the light-emitting elements, and a heat-dissipating pattern is disposed in direct contact with surfaces of the light source substrates at a second side of the light source substrates that is opposite the first side.

An electronic apparatus comprising:

• a transmissive liquid crystal panel;
• a backlight device;
• and
• cooling means for cooling a plurality of light source substrates,
• wherein,
• the backlight device includes the plurality of light source substrates having a plurality of light-emitting elements for emitting illumination light that is supplied to the transmissive liquid crystal panel,
• a reflecting sheet having a first surface, a second surface, and a plurality of openings, the first surface having the plurality of light source substrates provided thereon, wherein the plurality of light source substrates are attached to and held by the first surface of the reflecting sheet, the second surface being disposed opposite to the first surface and reflecting the illumination light emitted from the plurality of light-emitting elements, the openings connecting the first and second surfaces and being disposed in correspondence with the light-emitting elements so as to allow the light-emitting elements to be exposed from the second surface,
• a diffusing-guiding plate provided so as to directly face the second surface of the reflecting sheet at a predetermined distance from the second surface, the diffusing-guiding plate diffusing the illumination light emitted from the light-emitting elements and the illumination light incident from the reflecting sheet in an interior of the diffusing-guiding plate, and
• an optical-function-sheet layered body that is combined with the diffusing-guiding plate, that includes a plurality of laminated optical function sheets, and that guides the illumination light to the transmissive liquid crystal panel,
• wherein a heat-dissipating pattern is disposed in direct contact with only a first side of the plurality of light source substrates that is closest to the light-emitting elements.

An electronic apparatus comprising:

• a transmissive liquid crystal panel;
• a backlight device;
• and
• a cooling unit that cools a plurality of light source substrates,
• wherein,
• the backlight device includes the plurality of light source substrates having a plurality of light-emitting elements for emitting illumination light that is supplied to the transmissive liquid crystal panel,
• a reflecting sheet having a first surface, a second surface, and a plurality of openings, the first surface having the plurality of light source substrates provided thereon, wherein the plurality of light source substrates are attached to and held by the first surface of the reflecting sheet, the second surface being disposed opposite to the first surface and reflecting the illumination light emitted from the plurality of light-emitting elements, the openings connecting the first and second surfaces and being disposed in correspondence with the light-emitting elements so as to allow the light-emitting elements to be exposed from the second surface,
• a diffusing-guiding plate provided so as to directly face the second surface of the reflecting sheet at a predetermined distance from the second surface, the diffusing-guiding plate diffusing the illumination light emitted from the light-emitting elements and the illumination light incident from the reflecting sheet in an interior of the diffusing-guiding plate, and
• an optical-function-sheet layered body that is combined with the diffusing-guiding plate, that includes a plurality of laminated optical function sheets, and that guides the illumination light to the transmissive liquid crystal panel,
• wherein a heat-dissipating pattern is disposed between the reflecting sheet and the plurality of light source substrates, and wherein the heat-dissipating pattern is in contact with the plurality of light source substrates only on a first side of the light source substrates that is opposite the first surface of the reflecting sheet.