BACKLIGHT DEVICE, DISPLAY DEVICE AND TELEVISION RECEIVER
First Claim
Patent Images
1. A backlight device, comprising:
- a white light source having a first light emission surface;
a light transmitting member having a light incident surface on which light emitted from the first light emission surface of the white light source is incident, and a second light emission surface from which incident light is emitted; and
a filter member that is arranged in a region through which light emitted from the white light source passes, the filter member absorbing or reflecting, at a predetermined ratio, light having a predetermined wavelength included in light emitted from the white light source,whereinthe filter member is arranged so as to be tilted with respect to at least either the first light emission surface of the white light source or the second light emission surface of the light transmitting member,whereinthe filter member is structured such that absorptance or reflectance of light having the predetermined wavelength varies as an incident angle of light varies, andwhereinthe filter member is structured such that a tilt angle at which the filter member is tilted with respect to at least either the first light emission surface of the white light source or the second light emission surface of the light transmitting member is adjustable.
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Abstract
To provide a backlight device with which a color hue and a color purity of a display panel can be improved while suppressing the lowering of the brightness of the display panel. A backlight device (20) comprises a pseudo white LED (21), a light guide plate (22), and a dichroic filter (25) which reflects a light with a predetermined wavelength among the light emitted from the pseudo white LED at a predetermined ratio. The dichroic filter is configured so that the light reflectance changes when the incident angle of the light is changed and a tilt angle to a light emitting surface (21e) of the pseudo white LED can be adjusted.
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20 Claims
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1. A backlight device, comprising:
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a white light source having a first light emission surface; a light transmitting member having a light incident surface on which light emitted from the first light emission surface of the white light source is incident, and a second light emission surface from which incident light is emitted; and a filter member that is arranged in a region through which light emitted from the white light source passes, the filter member absorbing or reflecting, at a predetermined ratio, light having a predetermined wavelength included in light emitted from the white light source, wherein the filter member is arranged so as to be tilted with respect to at least either the first light emission surface of the white light source or the second light emission surface of the light transmitting member, wherein the filter member is structured such that absorptance or reflectance of light having the predetermined wavelength varies as an incident angle of light varies, and wherein the filter member is structured such that a tilt angle at which the filter member is tilted with respect to at least either the first light emission surface of the white light source or the second light emission surface of the light transmitting member is adjustable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification