LIGHT SOURCE APPARATUS

• US 20130069560A1
• Filed: 09/13/2012
• Published: 03/21/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kurita, Masanao
• Granted Patent: US 8,823,282 B2
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

A light source apparatus according to the present invention includes: a plurality of light emitting substrates arranged in matrix form, each having at least one light source; an intermediate substrate provided between respective rows of the plurality of light emitting substrates; and a driving unit that outputs a drive signal for driving the light sources, wherein a first supply wiring for supplying the drive signal to the light source provided on each of the plurality of light emitting substrates is printed on each of the light emitting substrates, and a first connection wiring for electrically connecting the first supply wirings printed on two light emitting substrates sandwiching the intermediate substrate is printed on the intermediate substrate.

Claims

1. A light source apparatus comprising:

a plurality of light emitting substrates arranged in matrix form, each having at least one light source;

an intermediate substrate provided between respective rows of the plurality of light emitting substrates; and

a driving unit that outputs a drive signal for driving the light sources,

wherein a first supply wiring for supplying the drive signal to the light source provided on each of the plurality of light emitting substrates is printed on each of the light emitting substrates,

a first connection wiring for electrically connecting the first supply wirings printed on two light emitting substrates sandwiching the intermediate substrate is printed on the intermediate substrate,

the drive signal output by the driving unit is input into a first light emitting substrate of the plurality of light emitting substrates, which is a light emitting substrate positioned on one end in a column direction,

a path for supplying the drive signal to the light source of the first light emitting substrate is constituted by the first supply wiring printed on the first light emitting substrate, and

a path for supplying the drive signal to the light source of a second light emitting substrate of the plurality of light emitting substrates, which is a light emitting substrate other than the first light emitting substrate, is constituted by the first supply wiring printed on the second light emitting substrate, the first supply wiring printed on a light emitting substrate positioned closer to the driving unit than the second light emitting substrate, and the first connection wiring printed on the intermediate substrate provided between the light emitting substrates.

2. The light source apparatus according to claim 1, further comprising a control unit that outputs a control signal for controlling a light emission brightness of the light source,

wherein the control signal output by the control unit is input into the first light emitting substrate,

a second supply wiring for supplying the control signal to the light source provided on each of the plurality of light emitting substrates is further printed on each of the light emitting substrates,

a first transmission wiring for transmitting the control signal is further printed on at least a light emitting substrate, from among the plurality of light emitting substrates, other than a light emitting substrate positioned furthest from the control unit,

a second connection wiring is further printed on the intermediate substrate to electrically connect the first transmission wiring printed on a light emitting substrate positioned close to the control unit, from among two light emitting substrates sandwiching the intermediate substrate, to the second supply wiring printed on a light emitting substrate positioned far from the control unit, from among two light emitting substrates sandwiching the intermediate substrate,

a path for supplying the control signal to the light source of the first light emitting substrate is constituted by the second supply wiring printed on the first light emitting substrate, and

a path for supplying the control signal to the light source of a third light emitting substrate of the plurality of light emitting substrates, which is a light emitting substrate on a row adjacent to the first light emitting substrate, is constituted by the second supply wiring printed on the third light emitting substrate, the first transmission wiring printed on the first light emitting substrate, and the second connection wiring printed on the intermediate substrate provided between the light emitting substrates.

3. The light source apparatus according to claim 2, wherein a third connection wiring is further printed on an intermediate substrate other than an intermediate substrate positioned furthest from the control unit to electrically connect the first transmission wirings printed on the two light emitting substrates sandwiching the intermediate substrate, and

a path for supplying the control signal to the light source of a fourth light emitting substrate of the plurality of light emitting substrates, which is a light emitting substrate positioned further from the control unit than the third light emitting substrate, is constituted by the second supply wiring printed on the fourth light emitting substrate, the second connection wiring printed on an intermediate substrate adjacent to a control unit side of the fourth light emitting substrate, the first transmission wiring printed on light emitting substrates positioned closer to the control unit than the fourth light emitting substrate, and the third connection wiring printed on the intermediate substrate provided between the light emitting substrates positioned closer to the control unit than the fourth light emitting substrate.

4. The light source apparatus according to claim 1, further comprising a brightness sensor that is provided on an intermediate substrate adjacent to the first light emitting substrate and that measures a light emitting brightness of the light source apparatus,

wherein a second transmission wiring for transmitting a measurement result of the brightness sensor is further printed on at least the first light emitting substrate of the plurality of light emitting substrates,

an extraction wiring for extracting the measurement result from the brightness sensor is further printed on the intermediate substrate provided with the brightness sensor, and

a path for extracting the measurement result of the brightness sensor to an exterior of the light source apparatus is constituted by the extraction wiring printed on the intermediate substrate provided with the brightness sensor and the second transmission wiring printed on the first light emitting substrate.

5. The light source apparatus according to claim 1, further comprising a brightness sensor that is provided on at least one intermediate substrate other than an intermediate substrate adjacent to the first light emitting substrate and that measures a light emitting brightness of the light source apparatus,

wherein a second transmission wiring for transmitting a measurement result of the brightness sensor is further printed on at least a light emitting substrate, from among the plurality of light emitting substrates, positioned closer to the driving unit than the intermediate substrate having the brightness sensor,

an extraction wiring for extracting the measurement result from the brightness sensor is further printed on the intermediate substrate provided with the brightness sensor,

a fourth connection wiring is further printed on an intermediate substrate positioned closer to the driving portion than the intermediate substrate provided with the brightness sensor to electrically connect the second transmission wirings printed on two light emitting substrates sandwiching the intermediate substrate, and

a path for extracting the measurement result of the brightness sensor to an exterior of the light source apparatus is constituted by the extraction wiring printed on the intermediate substrate provided with the brightness sensor, the second transmission wiring printed on the light emitting substrate positioned closer to the driving unit than the intermediate substrate, and the fourth connection wiring printed on an intermediate substrate positioned closer to the driving unit than the intermediate substrate.

6. The light source apparatus according to claim 1, further comprising a brightness sensor that is provided on at least one intermediate substrate and that measures a light emitting brightness of the light source apparatus,

wherein an extraction wiring for extracting a measurement result from the brightness sensor to an exterior of the light source apparatus is printed on the intermediate substrate provided with the brightness sensor, and

the extraction wiring is printed to be orthogonal to other wiring printed on the intermediate substrate on which the extraction wiring is printed.

7. The light source apparatus according to claim 1, wherein the plurality of light emitting substrates have identical mounted components and printed wiring.

8. The light source apparatus according to claim 1, wherein the intermediate substrate is divided into a plurality of sub-intermediate substrates adjacent to each other in a row direction.

9. The light source apparatus according to claim 6, wherein the intermediate substrate is divided into a plurality of sub-intermediate substrates adjacent to each other in a row direction, and

connectors for connecting extraction wirings printed on the respective sub-intermediate substrates to each other are provided on the respective sub-intermediate substrates.