Liquid crystal display device with backlight having efficient heat radiating properties
View Patent ↗The present invention provides a liquid crystal display device having a linear light source, which is easily treated, in consideration of the heat radiation of a light-emitting diode in the liquid crystal display using the light-emitting diode as a light source. A light-emitting diode 150 is provided on a metal substrate 161 . The metal substrate 161 is formed in a case shape such that the heat generated at the light-emitting diode 150 received in the case is efficiently radiated. A resin material 175 is filled in the metal case to form a plate-shaped light source 130 . It is possible to improve reliability during the handling in the manufacturing process by filling the resin material 175 to form the plate-shaped light source. It is possible to improve heat radiation effect by filling the resin material 157.
1. A liquid crystal display device comprising:
a liquid crystal display panel in which a liquid crystal layer is provided between a pair of transparent substrates having electrodes for forming pixels therein; and
a backlight which irradiates a rear surface of the liquid crystal display panel;
wherein the backlight has a light source which includes: a plurality of light-emitting elements, a circuit substrate on which the plurality of light-emitting elements are arranged, and a metal case arranged for receiving the circuit substrate;
wherein a resin material is filled in the metal case on the circuit substrate and around sides of the plurality of light-emitting elements in the metal case; and
wherein each of the plurality of light-emitting elements include a LED chip and a fluorescence light-emitting unit provided at a light-emitting surface side of the LED chip.
2. The liquid crystal display device according to claim 1 , wherein the plurality of light-emitting elements is a plurality of light-emitting diodes.
3. The liquid crystal display device according to claim 2 , wherein the plurality of light-emitting diodes is divided into at least two groups of light-emitting diodes and a voltage is applied to each group of light-emitting diodes.
4. The liquid crystal display device according to claim 1 , wherein the metal case includes a bottom surface and two pairs of side surfaces which extend in directions transverse to one another.
5. A liquid crystal display device comprising:
a liquid crystal display panel in which a liquid crystal layer is provided between a pair of transparent substrates having electrodes for forming pixels therein; and
a backlight which irradiates a rear surface of the liquid crystal display panel;
wherein the backlight has a light source which includes: a plurality of light-emitting diodes arranged linearly, a circuit substrate for electrically connecting the plurality of light-emitting diodes, and a case having side surfaces and a bottom surface for receiving the circuit substrate;
wherein a resin material is filled in the case on the circuit substrate between the plurality of light-emitting diodes and the side surfaces of the case;
wherein a fluorescence light-emitting unit is provided at a light-emitting surface side of each of the plurality of light-emitting diodes; and
wherein the case is a metal case which includes a bottom surface and two pairs of side surfaces which extend in directions transverse to one another.
6. The liquid crystal display device according to claim 5 , wherein the plurality of light-emitting diodes is divided into at least two groups of light-emitting diodes and a voltage is applied to each group of light-emitting diodes.
7. A liquid crystal display device comprising:
a liquid crystal display panel in which a liquid crystal layer is provided between a pair of transparent substrates having electrodes for forming pixels therein;
a backlight which irradiates a rear surface of the liquid crystal display panel; and
a control unit which controls the liquid crystal display panel,
wherein the backlight has a light guiding plate and a plate-shaped light source formed along one side of the light guiding plate;
wherein the plate-shaped light source has a light-emitting surface, a bottom facing the light-emitting surface, and side surfaces formed on the circumference of the bottom;
wherein the bottom has a metal surface, an insulating layer covering the metal surface, and an interconnection provided on the insulating layer;
wherein a plurality of light-emitting diodes are electrically connected to the interconnection;
wherein an opening is formed in the side surfaces or the bottom;
wherein a connection wiring for electrically connecting the plurality of light-emitting diodes and the control unit is positioned in the opening; and
wherein a resin layer is formed on the insulating layer.
8. The liquid crystal display device according to claim 7 , wherein the plurality of light-emitting diodes is divided into at least two groups of light-emitting diodes and a voltage is applied to each group of light-emitting diodes.
9. The liquid crystal display device according to claim 7 , wherein the resin layer is arranged over the bottom of the plate-shaped light source.