Display device

Patent metadata

Field	Value
Publication number	US-9804484-B2
Application number	US-201113700110-A
Country	US
Kind code	B2
Filing date	May 18, 2011
Priority date	May 31, 2010
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A display device is provided with a plurality of solid-state light sources ( 101 - 103 ) and a coolant-circulating means ( 100 ) that is equipped with a flow path ( 100 a ) formed to pass through each of the solid-state light sources ( 101 - 103 ) and that circulates a coolant via the flow path ( 100 a ). Each of the solid-state light sources ( 101 - 103 ) has the property that the luminance thereof changes in response to a temperature change. The flow path ( 100 a ) is formed such that the coolant first passes through solid-state light sources having a greater degree of luminance change according to the above-described property of the solid-state light sources ( 101 - 103 ).

First claim

What is claimed is:

1. A display device equipped with a plurality of solid-state light sources, comprising:
a coolant-circulating unit that is provided with a flow path formed to pass through each of said plurality of solid-state light sources and that circulates a coolant by way of the flow path,
wherein:
each of said plurality of solid-state light sources has a property by which luminance changes according to temperature change, and
said flow path is formed such that said coolant first passes through, from among said plurality of solid-state light sources, solid-state light sources having a greater degree of luminance change according to said property, wherein:
said plurality of solid-state light sources includes a plurality of first solid-state light sources that emit light of a first color, the degree of said change in luminance of these first solid-state light sources being greater than other solid-state light sources, and
said flow path includes a plurality of branch flow paths that are provided in parallel and that are arranged to correspond to said plurality of first solid-state light sources in a one-to-one relationship, said coolant separately passing through each of said plurality of first solid-state light sources via said plurality of branch flow paths,
wherein said plurality of branch flow paths are joined at a junction part to form a joined flow path through which the coolant that passed through said plurality of first solid-state light sources is supplied to said other solid-state light sources.

2. The display device as set forth in claim 1 , wherein said other solid-state light sources are provided in series on a flow path that follows confluence of said plurality of branch flow paths.

3. The display device as set forth in claim 1 , wherein:
said other solid-state light sources includes:
a plurality of second solid-state light sources that emit light of a second color that differs from said first color; and
at least one third solid-state light source that emits light of a third color that differs from said first and second colors,

the degree of said change in luminance of said plurality of second solid-state light sources is greater than for said third solid-state light source, and
the flow path that follows confluence of said plurality of branch flow paths is formed such that said coolant passes by way of said plurality of second solid-state light sources before it passes by way of said third solid-state light source.

4. The display device as set forth in claim 1 , wherein:
said coolant-circulating unit includes:
a plurality of radiators provided in parallel; and
a plurality of fans that each supplies cooling air to a respective radiator of said plurality of radiators, and
wherein said coolant that circulates through said flow path is branched and supplied to each of said plurality of radiators.

5. The display device as set forth in claim 1 , wherein the flow path is formed such that an order of cooling the plurality of solid-state light sources is based on the degree of change in luminance.

6. The display device as set forth in claim 1 ,
wherein the plurality of branch flow paths that are provided in parallel has the coolant separately passing first through all of said plurality of first solid-state light sources via said plurality of branch flow paths, and
wherein the solid-state light sources in which the degree of luminance change is greater than other solid state light sources are cooled by the coolant at a lower temperature than the other solid state light sources from an order of cooling the plurality of solid-state light sources.

7. The display device as set forth in claim 1 , wherein the junction part forms the joined flow path through which the coolant that passed through said plurality of first solid-state light sources is supplied to said other solid-state light sources in a series of stages of the other solid-state light sources.

8. The display device as set forth in claim 2 , wherein:
said other solid-state light sources includes:
a plurality of second solid-state light sources that emit light of a second color that differs from said first color; and
at least one third solid-state light source that emits light of a third color that differs from said first and second colors,
the degree of said change in luminance of said plurality of second solid-state light sources is greater than for said third solid-state light source, and
the flow path that follows confluence of said plurality of branch flow paths is formed such that said coolant passes by way of said plurality of second solid-state light sources before it passes by way of said third solid-state light source.

9. The display device as set forth in claim 2 , wherein:
said coolant-circulating unit includes:
a plurality of radiators provided in parallel; and
a plurality of fans that each supplies cooling air to a respective radiator of said plurality of radiators, and

wherein said coolant that circulates through said flow path is branched and supplied to each of said plurality of radiators.

10. The display device as set forth in claim 3 , wherein said plurality of first solid-state light sources is made up by two red LEDs (light emitting diodes) that emit red light, said plurality of second solid-state light sources is made up by three green LEDs that emit green light, and said third solid-state light source is made up by one LED that emits blue light.

11. The display device as set forth in claim 3 , wherein:
said coolant-circulating unit includes:
a plurality of radiators provided in parallel; and
a plurality of fans that each supplies cooling air to a respective radiator of said plurality of radiators, and

wherein said coolant that circulates through said flow path is branched and supplied to each of said plurality of radiators.

12. The display device as set forth in claim 10 , wherein:
said coolant-circulating unit includes:
a plurality of radiators provided in parallel; and
a plurality of fans that each supplies cooling air to a respective radiator of said plurality of radiators, and

wherein said coolant that circulates through said flow path is branched and supplied to each of said plurality of radiators.

13. A display device equipped with a plurality of solid-state light sources, comprising:
a coolant-circulating unit that is provided with a flow path formed to pass through each of said plurality of solid-state light sources and that circulates a coolant by way of the flow path,
wherein:
each of said plurality of solid-state light sources has a property by which luminance changes according to temperature change, and
said flow path is formed such that said coolant first passes through, from among said plurality of solid-state light sources, solid-state light sources having a greater degree of luminance change according to said property,
wherein said flow path is formed such that said coolant passes through the plurality of solid-state light sources in an order starting with the solid-state light sources having the greater degree of luminance change according to said property,
wherein said plurality of solid-state light sources includes a plurality of first solid-state light sources that emit light of a first color, the degree of said change in luminance of these first solid-state light sources being greater than other solid-state light sources, and
wherein said flow path includes a plurality of branch flow paths that are arranged to correspond to said plurality of first solid-state light sources in a one-to-one relationship, said coolant separately passing through each of said plurality of first solid-state li

Assignees

• Chiba Masaki
• Masuda Naoki
• Nec Corp
• Nec Display Solutions Ltd

Inventors

• Chiba Masaki
• Masuda Naoki

Classifications

• G03B21/16 Primary

  Cooling; Preventing overheating · CPC title

• G03B21/2033

  LED or laser light sources · CPC title

• H04N9/3144

  Cooling systems (cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16) · CPC title