TWI551822B - Light-emitting apparatus - Google Patents

Description

Illuminating device

The present invention relates to a light-emitting device having a uniform light field.

A light-emitting diode is a widely used light source among semiconductor elements. Compared with traditional incandescent bulbs or fluorescent tubes, LEDs have the characteristics of power saving and long service life, so they gradually replace traditional light sources and are used in various fields, such as traffic signs, backlight modules, street lighting. , medical equipment and other industries.

In recent years, as the application of light-emitting diodes has increased, various methods for increasing the light extraction efficiency of light-emitting diodes have been proposed. One of the problems faced in order to improve the efficiency of light extraction is that the current distribution between the electrodes of the light-emitting diodes is uneven, causing current crowding problems in local regions. Because the current distribution between the two electrodes is uneven, the operating current is increased and the current density of the specific region is too high, so that the overall luminous efficiency of the light-emitting diode is lowered.

When the current density of the specific region is too high, the light output of the light-emitting diode is concentrated. Even if the surface is roughened or the reflective structure is improved on the light-emitting diode, only a certain degree of light-emitting efficiency can be improved. When the light-emitting diode is coupled to the package substrate and then applied to the lamp, it is necessary to form a lens on the structure of the lamp to uniformly distribute the light.

A light-emitting device comprising: a base having an upper surface; a plurality of light-emitting units formed on an upper surface of the base and arranged in an annular pattern; the plurality of light-guiding units are respectively formed in each of the hair Above the light unit, each light guiding unit has a first curved surface and a second curved surface to extract light.

100‧‧‧Lighting device

102‧‧‧Base

102a‧‧‧ upper surface

102b‧‧‧ first row of hot holes

104‧‧‧Lighting unit

106‧‧‧Light guide unit

106a‧‧‧First curved surface

106b‧‧‧second curved surface

106c‧‧‧ openings

108‧‧‧ openings

110‧‧‧column heat sink

110a‧‧‧ third row of hot holes

112‧‧‧Circuit board

112a‧‧‧Second row of hot holes

112b‧‧‧Installation

114‧‧‧Package substrate

118‧‧‧Blue Light Emitting Diode Grains

120‧‧‧Red light emitting diode crystal

122‧‧‧Package colloid

124‧‧‧wavelength conversion unit

C‧‧‧ Surrounding Center

Fig. 1A is a side cross-sectional view showing a specific embodiment of a light-emitting device of the present invention.

Fig. 1B is a top cross-sectional view of the light-emitting device of the present invention.

1C is a schematic view of a light guiding unit of the light-emitting device of the present invention.

Fig. 1D is a schematic view of a light-emitting unit of the light-emitting device of the present invention.

1A and 1B are a specific embodiment of a light-emitting device of the present invention. The light emitting device 100 can be, for example, a light bulb device, and includes a base 102 having an upper surface 102a, a circuit board 112 formed on the upper surface 102a of the base 102, and a plurality of light emitting units 104 formed on the circuit board 112 and arranged in a ring. The pattern and the plurality of light guiding units 106 are respectively formed on the plurality of light emitting units 104. The light-emitting unit 104 can be, for example, a light-emitting diode package component, and the light-guiding unit 106 includes a first curved surface 106a for reflecting light and a second curved surface 106b for allowing light to pass through. The sides of the plurality of light guiding units 106 may be connected to each other or staggered to form an accommodating space, and the top ends are arranged as an opening 108. Each of the light guiding units 106 is circumferentially arranged according to a surrounding center C, and the first curved surface 106a is closer to the surrounding center than the second curved surface 106b.

The base 102 may have a driving unit (not shown) inside to convert external alternating current into direct current to be supplied to the circuit board 112. The upper surface 102a of the pedestal 102 may have a columnar heat dissipating unit 110 substantially below the opening 108. As shown in FIG. 1B, the schematic central position of the circuit board 112 may have a correspondingly accommodating the columnar heat dissipating unit 110. With the opening 112b, the columnar heat dissipating unit 110 can be integrally disposed on the upper surface 102a of the susceptor 102. The pedestal 102 may have a plurality of first heat holes 102b extending through the upper surface 102a, and the circuit board 112 may have a plurality of second heat holes 112a corresponding to the plurality of first heat holes 102b, and the column heat dissipation unit 110 also has a longitudinal direction. The third row of heat holes 110a are penetrated. The heat generated by the driving unit inside the susceptor 102 can be generated by the first heat discharging hole 102b, the second heat discharging hole 112a, and the third heat discharging hole 110a. The light flows through the opening 108 and exits the light emitting device 100, and the heat generated by the light emitting unit 104 can also be discharged outside the light emitting device 100 through the circuit board 112 and the columnar heat dissipating unit 110.

As shown in FIG. 1C, the light guiding unit 106 can be a hollow body, and the bottom portion has an opening 106c for accommodating the light emitting unit 104. The first curved surface 106a can form a high reflection by coating a reflective material, grinding or coating. surface. The highly reflective surface may be formed inside or outside the light guiding unit 106. The area of the first curved surface 106a is smaller than the second curved surface 106b, and the light of the light emitting unit 104 may be directly emitted by the second curved surface 106b, or may be reflected by the first curved surface 106a to the second curved surface 106b, or The first curved surface 106a and the second curved surface 106b are reflected back and forth to be emitted by the second curved surface 106b. The light generated by the light emitting unit 104 can be emitted by the second curved surface 106b at various angles, so that the light emitting device 100 generates a wide-area light field distribution. The hollow body structure of the light guiding unit 106 in this embodiment is only an example, and the light guiding unit 106 can also be a transparent solid body.

As shown in FIG. 1D, the light emitting unit 104 may include a package substrate 114, one or a plurality of blue light emitting diode crystal grains 118, one or a plurality of red light emitting diode crystal grains 120, and cover the blue light emitting diode crystal grains. 118 and one of the encapsulating colloids 122 on the red light emitting diode die 120 and a layer wavelength converting unit 124 formed on the surface of the encapsulant 122. The white light for illumination can be generated by the light mixing of the blue light emitting diode die 118, the red light emitting diode die 120, and the wavelength converting unit 124.

Although the invention has been described above, it is not intended to limit the scope of the invention, the order of implementation, or the materials and process methods used. Various modifications and variations of the present invention are possible without departing from the spirit and scope of the invention.

100‧‧‧Lighting device

102‧‧‧Base

102a‧‧‧ upper surface

102b‧‧‧ first row of hot holes

104‧‧‧Lighting unit

106‧‧‧Light guide unit

106a‧‧‧First curved surface

106b‧‧‧second curved surface

108‧‧‧ openings

110‧‧‧column heat sink

112‧‧‧Circuit board

112a‧‧‧Second row of hot holes

C‧‧‧ Surrounding Center

Claims (9)

A illuminating device comprising: a pedestal having an upper surface; a plurality of illuminating units on the upper surface and emitting a light; a plurality of light guiding units located above the illuminating unit and substantially surrounding Arranging a surrounding center, wherein at least one of the light guiding units has a first curved surface and a second curved surface, at least a portion of the light is incident into the light guiding unit, and the second curved surface Leave the light guide unit. The illuminating device of claim 1, wherein a reflective material is formed on the first arc surface to reflect the light of the light emitting unit, and the second curved surface receives the light from the first curved surface and the light is The light guiding unit is picked up from the second arc surface. The light-emitting device of claim 1, wherein the first curved surface of each of the light guiding units is closer to the surrounding center than the second curved surface. The illuminating device of claim 3, wherein the plurality of illuminating units surround the surrounding center. The illuminating device of claim 1, wherein the thickness of the light guiding unit is tapered toward the ends in a horizontal section. The illuminating device according to claim 3, further comprising a columnar heat dissipating unit surrounded by the plurality of light guiding units. The illuminating device of claim 1, wherein the thickness of each of the light guiding units is tapered from a side close to one of the light emitting units toward a side away from the light emitting unit. The illuminating device of claim 1, wherein the illuminating unit comprises a package substrate, a red light emitting diode die and a blue light emitting diode die on the package substrate, and an encapsulant coating The red light emitting diode die and the blue light emitting diode die are covered, and a wavelength conversion unit is formed on the surface of the encapsulant. The light-emitting device of claim 3, wherein the plurality of light guiding units are arranged at the top to form an opening.