# US 2019/0246471 A1 · Light-emitting module and light-emitting device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0246471 A1
- Document ID: US20190246471A1
- Status: Published application
- Kind: A1
- Application number: 16/241,879
- Filed: 2019-01-07
- Published: 2019-08-08
- Earliest claimed: 2018-02-08
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: TAKESHI TAKARADA
- Web page: https://patentgrep.com/patent/US20190246471A1

## CPC

- H05B 45/20: Controlling the colour of the light
- G02F 1/133603: {with LEDs}
- H05B 45/34: Voltage stabilisation; Maintaining constant voltage
- H05B 45/40: Details of LED load circuits
- H05B 45/46: having LEDs disposed in parallel lines
- H05B 45/58: involving end of life detection of LEDs
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A light-emitting module includes a first LED, a second LED connected in parallel with the first LED, and a constant voltage circuit connected in series with the second LED and in parallel with the first LED. The constant voltage circuit maintains a voltage between one end and the other end at a constant voltage. The first LED and the second LED have the same VF characteristics.

## Claims

### Claim 1

A light-emitting module comprising:
a first light-emitting diode;
a second light-emitting diode connected in parallel with the first light-emitting diode, and having same characteristics as the first light-emitting diode; and
a constant voltage circuit connected in series with the second light-emitting diode, and connected in parallel with the first light-emitting diode.

### Claim 2 (depends on 1)

The light-emitting module according to claim 1, wherein
a plurality of sub-lighting circuits, each including the second light-emitting diode and the constant voltage circuit, are connected in parallel, and
the constant voltage circuits included in the plurality of sub-lighting circuits generate constant voltages at different levels from each other.

### Claim 3 (depends on 1)

The light-emitting module according to claim 1, wherein
an anode of the first light-emitting diode and one end of the constant voltage circuit are connected,
an anode of the second light-emitting diode and an other end of the constant voltage circuit are connected,
a cathode of the first light-emitting diode and a cathode of the second light-emitting diode are connected, and
the constant voltage circuit maintains a state where a voltage at the one end is higher than a voltage at the other end by a certain amount.

### Claim 4 (depends on 1)

A light-emitting device, wherein a plurality of light-emitting modules according to claim 1 are connected in series.

### Claim 5

A light-emitting device comprising:
a first light-emitting diode array including a plurality of light-emitting diodes connected in series;
a second light-emitting diode array including a plurality of light-emitting diodes, and connected in parallel with the first light-emitting diode array; and
a constant voltage circuit connected in series with the second light-emitting diode array, and connected in parallel with the first light-emitting diode array,
wherein
all the light-emitting diodes included in the first light-emitting diode array and the second light-emitting diode array have same characteristics.

### Claim 6 (depends on 5)

The light-emitting device according to claim 5, wherein
a plurality of sub-lighting circuits, each including the second light-emitting diode array and the constant voltage circuit, are connected in parallel, and
the constant voltage circuits included in the plurality of sub-lighting circuits generate constant voltages at different levels from each other.