LIGHT EMITTING DEVICE ASSEMBLY, SURFACE LIGHT SOURCE DEVICE, LIQUID CRYSTAL DISPLAY DEVICE ASSEMBLY, AND LIGHT OUTPUT MEMBER

• US 20120314424A1
• Filed: 08/22/2012
• Published: 12/13/2012
• Est. Priority Date: 07/24/2008
• Status: Active Grant

• Current Assignee: Saturn Licensing LLC (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ohkawa, Shingo
• Granted Patent: US 8,405,795 B2
• Time in Patent Office: Days
• US Class Current: 362/327
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: G02F 2201/58 Arrangements comprising a monitoring photodetector
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H01L 2224/0554 : External layer
• CPC Class Codes: H01L 2224/0555 : Shape
• CPC Class Codes: H01L 2224/0556 : Disposition
• CPC Class Codes: H01L 2224/05568 : the whole external layer protruding from the surface
• CPC Class Codes: H01L 2224/05573 : Single external layer
• CPC Class Codes: H01L 2224/05599 : Material
• CPC Class Codes: H01L 2224/16225 : the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 : Arched
• CPC Class Codes: H01L 2224/48465 : the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/73265 : Layer and wire connectors
• CPC Class Codes: H01L 2924/00 : Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 : the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/13091 : Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]

Abstract

A light emitting device assembly includes: a light emitting device; and a light output member provided on the light emitting element and having an upper surface on which a curved part that outputs light from the light emitting device is provided, wherein a value of a x coordinate of a curved part center axis is a positive value, a locus of an edge of a curved part forms a circle or oval around the curved part center axis, light on a Z-axis output from an origin is output from the curved part at an angle θ₀ (θ₀>0) formed with the Z-axis within a XZ-plane, and function F(φ,Δφ) expressed by

F(φ,Δφ)=(Δθ₊−Δθ₋  (1)

monotonously increases, takes the maximum value at φ=φ₀ (<0), and then, monotonously decreases as a value of φ increases from the minimum value.

Claims

1. A light emitting device assembly comprising:

(A) a light emitting device; and

(B) a light output member provided on the light emitting element and having an upper surface on which a curved part that outputs light from the light emitting device is provided,

wherein, assuming that (i) an axis line passing through the center of the curved part and being in parallel with a normal line of a light exit surface of the light emitting device is a curved part center axis,

(ii) an orthogonal coordinate system (x,y,z) in a three-dimensional space has the normal line of the light exit surface of the light emitting device passing through the center of the light emitting device as the Z-axis, a plane containing the curved part center axis and the Z-axis as the XZ-plane, a point at which the Z-axis and the light exit surface of the light emitting device intersects as the origin,

(iii) when light output from the curved part travels in a positive direction of the X-axis within the XZ-plane, an angle formed by the traveling direction of the light and the Z-axis takes a positive value,

(iv) the light output from the origin at an angle φ

formed with the Z-axis within the XZ-plane is output from the curved part at an angle θ

formed with the Z-axis within the XZ-plane,

(v) the light output from the origin at an angle (φ

+|Δ

φ

|/2) formed with the Z-axis within the XZ-plane is output from the curved part at an angle (θ

+Δ

θ

₊) formed with the Z-axis within the XZ-plane, and

(vi) the light output from the origin at an angle (φ

−

|Δ

φ

|/2) formed with the Z-axis within the XZ-plane is output from the curved part at an angle (θ

+Δ

θ

₋

) formed with the Z-axis within the XZ-plane,

the value of the x coordinate of the curved part center axis is a positive value,

a locus of an edge of the curved part forms a circle or oval around the curved part center axis,

the light on the Z-axis output from the origin is output from the curved part at an angle θ

₀ (θ

₀>

0) formed with the Z-axis within the XZ-plane, and

function F(φ

,Δ

φ

) expressed by

F(φ

,Δ

φ

)=(Δ

θ

₊−

Δ

θ

₋

)/Δ

φ

 

 

(1)

monotonously increases, takes the maximum value at φ

=φ

₀ (<

0), and then, monotonously decreases as the value of φ

increases from the minimum value.

2. The light emitting device assembly according to claim 1, wherein the curved part has a concave surface and a convex surface continuous from the concave surface,

an angle φ

_min-v formed by a local minimum point of the concave surface and the origin satisfies φ

_min-v<

φ

₀,

a curve obtained when the curved part is cut along an arbitrary virtual plane containing the normal line of the light exit surface of the light emitting device and passing through the local minimum point of the concave surface, from the local maximum point as the starting point, monotonously increases from a convex downward condition via a point of inflexion into a convex upward condition, passes through the local maximum point, and monotonously decreases in a convex upward condition.

3. The light emitting device assembly according to claim 1, wherein the Δ

φ

takes one value equal to or less than 60 degrees.

4. The light emitting device assembly according to claim 1, wherein a value X_I-max of x coordinate at a point where light having the maximum light intensity is output from the curved part within the XZ-plane is a positive value.

5. The light emitting device assembly according to claim 1, wherein a curve obtained when the curved part is cut along the XZ-plane includes a first curve having a first local maximum value in a convex upward condition, a second curve smoothly connected to the first curve and having a local minimum value in a convex downward condition, and a third curve smoothly connected to the second curve and having a second local maximum value in a convex upward condition, as the value of the x coordinate increases from the minimum value.

6. The light emitting device assembly according to claim 5, wherein the second maximum value is larger than the first maximum value.

7. The light emitting device assembly according to claim 1, wherein the curved part has a non-rotationally symmetric shape with respect to the Z-axis.

8. The light emitting device assembly according to claim 1, wherein the curved part is symmetric with respect to the XZ-plane.

9. The light emitting device assembly according to claim 1, wherein the light emitting device faces the light output member via a light transmissive medium layer.

10. The light emitting device assembly according to claim 1, wherein there is an air layer between the light output member and the light emitting device,

a light incident lower surface facing the curved part is provided on the light output member, and

light from the light emitting device enters from the light incident lower surface into the light output member via the air layer.

11. The light emitting device assembly according to claim 1, wherein the light output member has a light reflecting lower surface that internally reflects and outputs the light internally reflected on the curved part from the upper surface.

12. The light emitting device assembly according to claim 11, wherein the light reflecting lower surface is located at an edge part of the light output member and includes a tilted surface, and

the tilted surface is tilted downward toward the outside and convex downward.

13-20. -20. (canceled)

21. A light output member provided on the light emitting element and having an upper surface on which a curved part that outputs light from the light emitting device- is provided,

wherein, assuming that (i) an axis line passing through the center of the curved part and being in parallel with a normal line of a light exit surface of the light emitting device is a curved part center axis,

(ii) an orthogonal coordinate system (x,y,z) in a three-dimensional space has the normal line of the light exit surface of the light emitting device passing through the center of the light emitting device as the Z-axis, a plane containing the curved part center axis and the Z-axis as the XZ-plane, a point at which the Z-axis and the light exit surface of the light emitting device intersects as the origin,

(iii) when light output from the curved part travels in a positive direction of the X-axis within the XZ-plane, an angle formed by the traveling direction of the light and the Z-axis takes a positive value,

(iv) the light output from the origin at an angle φ

formed with the Z-axis within the XZ-plane is output from the curved part at an angle θ

formed with the Z-axis within the XZ-plane,

(v) the light output from the origin at an angle (φ

+|Δ

φ

|/2) formed with the Z-axis within the XZ-plane is output from the curved part at an angle (θ

+Δ

θ

₊) formed with the Z-axis within the XZ-plane, and

(vi) the light output from the origin at an angle (φ

−

|Δ

φ

|/2) formed with the Z-axis within the XZ-plane is output from the curved part at an angle (θ

+Δ

θ

₋

) formed with the Z-axis within the XZ-plane,

the value of the x coordinate of the curved part center axis is a positive value,

a locus of an edge of the curved part forms a circle or oval around the curved part center axis,

the light on the Z-axis output from the origin is output from the curved part at an angle θ

₀ (θ

₀>

0) formed with the Z-axis within the XZ-plane, and

function F(φ

,Δ

φ

) expressed by

F(φ

,Δ

φ

)=(Δ

θ

₊−

Δ

θ

₋

)/Δ

φ

 

 

(1)

monotonously increases, takes the maximum value at φ

=φ

₀ (<

0), and then, monotonously decreases as the value of φ

increases from the minimum value.