Light emitting device, lighting device, and display device

Abstract

The present invention is a light emitting device used in a back light unit for a display device provided with a display panel. The present invention is specifically a light emitting device wherein light can be shown onto an object that is illuminated in the direction of the surface of that object that is illuminated with uniform brightness and that can be made thin and is also a lighting device and a display device provided with this light emitting device. A back light unit (1) is provided with a printed circuit board (12), a plurality of light emitting units (111) provided on the printed circuit board (12) and having a base (111b), an LED chip (111a), and a lens (112), and a reflective member (113) provided around the light emitting units (111) and having a first reflective member (1131) and a second reflective member (1132).

Description

technical field [0001] The present invention relates to a light emitting device provided in a backlight unit for irradiating light on the back surface of a display panel, and an illuminating device and a display device including the light emitting device. Background technique [0002] In the display panel, liquid crystal is sealed between two transparent substrates, and the direction of the liquid crystal molecules is changed by applying a voltage to change the light transmittance, thereby optically displaying a predetermined image or the like. In this display panel, since the liquid crystal itself is not a luminous body, for example, on the back side of a transmissive display panel, there is a device for irradiating light from a cold cathode tube (CCFL), a light emitting diode (LED: Light Emitting Diode), etc. as a light source. backlight components. [0003] Among the backlight units, there are: a direct type in which light sources such as cold cathode tubes or LEDs are a...

AI Technical Summary

Problems solved by technology

However, the edge-lit backlight unit not only has the problem of concentrated heat generation of the light sources due to the concentrated arrangement of the light sources at the edge of the light guide plate, but also has the problem of increasing the size of the frame of the display panel.

Furthermore, the edge-light type backlight unit has the problem that local dimming control (local dimming) that has attracted attention as a control method that can realize high-quality display images and power saving Control of small segmented areas to achieve high quality display images and power saving

However, in the technologies disclosed in Patent Documents 1 to 5, the amount of light changes with the square of the distance from the light-emitting element, so the light amount attenuates at the corner far from the light-emitting element compared with other positions, and it cannot provide surface orientation. On the uniform amount of light, so can not fully meet the above requirements

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