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AssigneeSharp Kabushiki Kaisha
InventorsYutaka Inoue, Kohji Ohtsuka, Kazuyoshi Izumi, Takashi Yoshii
Estimating the term…
A backlight unit includes a fluorescent lamp to illuminate a liquid crystal panel, a reflection unit for causing the light from the fluorescent lamp to exit toward a certain direction, and a diffusion unit for diffusing the light from the fluorescent lamp and reflection unit, and reflectance or transmittance in the horizontal and vertical directions is controlled by applying a dot pattern that gradually increases densities from the central portion toward the peripheral portion to the reflection unit or diffusion unit, or by applying a dot pattern that gradually increases densities from the central portion toward the both ends in the longitudinal direction on the surface of the fluorescent tube of the fluorescent lamp. By doing this, brightness gradient is formed in the horizontal and vertical directions so that the brightness in the central portion of the liquid crystal panel is relatively higher than the brightness of the peripheral portion thereof.
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A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the backlight unit has a reflection portion for causing the light from the plurality of light sources to exit toward a certain direction, wherein the reflection portion comprises at least a first and a second reflection layers having a predetermined level of light reflectance and transmittance, wherein the reflection portion consists of a first region with the first and second reflection layers being overlapped in the incident direction of light located at a position equivalent to the central portion on the surface to be illuminated of the object to be illuminated and a second region consisting of the first reflection layer only, and wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling reflectance of the reflection portion using the first region with relatively higher reflectance and the second region with lower reflectance than the first region.
A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the backlight unit has a reflection portion for causing the light from the plurality of light sources to exit toward a certain direction, wherein the reflection portion comprises at least a first and a second reflection layers having a predetermined level of light reflectance and transmittance, wherein the reflection portion consists of a first region with the first and second reflection layers being overlapped in the incident direction of light located at a position equivalent to the central portion in the horizontal direction on the surface to be illuminated of the object to be illuminated, and a second region consisting of the first reflection layer only located at the both ends, and wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling reflectance of the reflection portion in the horizontal direction on the surface to be illuminated and also by making the brightness of the light sources located at the position equivalent to the central portion in the vertical direction on the surface to be illuminated relatively higher than the brightness of the light sources located at the both ends, using the first region with relatively higher reflectance and the second region with lower reflectance than the first region.
A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the backlight unit has a reflection portion for causing the light from the plurality of light sources to exit toward a certain direction, wherein the reflection portion comprises at least a first and a second reflection layers having a predetermined level of light reflectance and transmittance, wherein the reflection portion consists of a first region with the first and second reflection layers overlapped in the incident direction of light located at a position equivalent to the central portion in the vertical direction on the surface to be illuminated of the object to be illuminated and a second region consisting of the first reflection layer only located at the both ends, and wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling reflectance of the reflection portion in the vertical direction on the surface to be illuminated and also by making the brightness of the light sources located at the position equivalent to the central portion in the horizontal direction on the surface to be illuminated relatively higher than the brightness of the light sources located at the both ends, using the first region with relatively higher reflectance and the second region with lower reflectance than the first region.
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A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the plurality of light sources comprise LEDs, wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling radiation brightness of the regions formed on the substrate of the backlight unit.
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A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the backlight unit has a reflection portion for causing the light from the plurality of light sources to exit toward a certain direction, wherein the reflection portion comprises at least a first and a second reflection layers having a predetermined level of light reflectance and transmittance, wherein the reflection portion consists of a first region with the first and second reflection layers being overlapped in the incident direction of light located at a position equivalent to the central portion in the horizontal direction on the surface to be illuminated of the object to be illuminated, and a second region consisting of the first reflection layer only located at the both ends, and wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling reflectance of the reflection portion in the horizontal direction on the surface to be illuminated and also by making the clearance of the light sources located at the position equivalent to the central portion in the vertical direction on the surface to be illuminated relatively smaller than the clearance of the light sources located at the both ends, using the first region with relatively higher reflectance and the second region with lower reflectance than the first region.
A backlight unit for illuminating an object to be illuminated using a plurality of light sources disposed directly below the object to be illuminated, wherein the backlight unit has a reflection portion for causing the light from the plurality of light sources to exit toward a certain direction, wherein the reflection portion comprises at least a first and a second reflection layers having a predetermined level of light reflectance and transmittance, wherein the reflection portion consists of a first region with the first and second reflection layers overlapped in the incident direction of light located at a position equivalent to the central portion in the vertical direction on the surface to be illuminated of the object to be illuminated and a second region consisting of the first reflection layer only located at the both ends, and wherein brightness gradient is formed in the horizontal and vertical directions on the surface to be illuminated of the object to be illuminated by controlling reflectance of the reflection portion in the vertical direction on the surface to be illuminated and also by making the clearance of the light sources located at the position equivalent to the central portion in the horizontal direction on the surface to be illuminated relatively smaller than the clearance of the light sources located at the both ends, using the first region with relatively higher reflectance and the second region with lower reflectance than the first region.
Dependencies are inferred from the claim text.