Integrated optical lens and LED light source device adopting same

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses an integrated optical lens and an LED light source device adopting the integrated optical lens. The integrated optical lens includes a lower optical interface for inputting light and an upper optical interface for outputting light. And the upper optical interface is a free-form surface of which the central area is concave towards the direction close to the lower optical interface and the peripheral edge area is convex towards the direction far away from the lower optical interface. And the curvature of the upper optical interface is gradually reduced from the center to the peripheral edge. According to the invention, the surface type of the upper optical interface is set, so that the LED light source device can realize a preset optical shaping effect without additionally arranging a secondary light distribution lens, the system volume is greatly reduced, and the backlight system is simple in structure and smaller and thinner in size. The light emitted by the single LED light source device is uniform, so that the uniformity is improved without depending on the superposition of a plurality of light sources, and the partition control is further realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor lighting, and more specifically, relates to an integrated optical lens and an LED light source device using the integrated optical lens. Background Art

[0002] There are generally two existing LED backlight illumination methods: edge-lit illumination method and direct-lit illumination method. Edge-lit: Multiple LED light sources are placed on the side of the light guide plate (the LED optical axis is basically perpendicular to the side of the light guide plate). The light emitted by the LEDs enters the light guide plate from the side of the light guide plate. After multiple total reflections and refractions occur in the light guide plate, finally all the light is transmitted out from the front of the light guide plate. By precisely controlling the ratio of reflection to refraction of the light guide plate, a uniform light-emitting surface can be formed on the front of the light guide plate.

[0003] Direct-lit: Multiple LED light sources are placed on the back of the diffuser plate (the LED optical axis is basically perpendicular to the back of the diffuser plate). In order to evenly irradiate the back of the diffuser plate with the light emitted by the LEDs, a secondary light distribution lens needs to be placed between each LED light source and the diffuser plate. After the secondary light distribution lens redistributes the light emitted by the LED light source, it irradiates the back of the diffuser plate relatively evenly. In this way, the light enters the diffuser plate from the back of the diffuser plate and diffuses again, and is emitted from the front of the diffuser plate, and a uniform light-emitting surface can be formed on the front of the diffuser plate.

[0004] Comparing the above two illumination methods, for the same light-emitting area, the light traveling path of the edge-lit method is much longer than that of the direct-lit method, and the light extraction efficiency of the edge-lit method is low. Therefore, the edge-lit illumination method has high energy consumption and high cost. In recent years, with the further application and popularization of products such as LED backlight illumination for displays and LED panel lights. The energy-saving requirements and cost control requirements for corresponding products are becoming more and more urgent; in such a background, the traditional edge-lit illumination method with low efficiency is gradually being replaced by the direct-lit illumination method.

[0005] Existing direct - type LED backlights usually arrange adjacent two LED lights in an equal - pitch row - column pattern and achieve it by simulating optical uniformity. However, this equal - pitch uniform arrangement causes the brightness in the middle area to be the superposition of the brightness in other surrounding areas. In addition, since the LED is a point light source, the brightness distribution decays rapidly with the increase of distance. The superposed brightness distribution in the edge area is very small, resulting in the brightness at the edge of the LED backlight being significantly less than that in the middle area, and the brightness uniformity of the entire screen is poor. Although the brightness uniformity can be improved by synchronously reducing the LED bead pitch, increasing the number of LED beads, changing the height between the diffuser plate and the LED bead array, etc., these solutions often come at the cost of increasing backlight power consumption, raising production costs, and sacrificing the thickness of the liquid crystal display module. Additionally, the size of the combination of the LED light source and the secondary light - distribution lens is much larger than the size of the LED light source itself, increasing the complexity of the backlight structure; at the same time, limited by the size of the secondary lens, the backlight structure cannot be made smaller and thinner.

[0006] Based on the above, the problem to be solved currently is: to provide an integrated optical lens that does not require a secondary light - distribution lens, has a small volume, uniform light emission, a small mixing light distance for array use, can control light in zones, and has a simple structure, and an LED light - source device using such an integrated optical lens. Summary of the Invention

[0007] The purpose of the present invention is to provide an integrated optical lens and an LED light - source device using such an integrated optical lens, aiming to solve the problems in the prior art that the LED light - source device has poor light - emission uniformity and needs to be optically shaped with a secondary optical lens, resulting in a large volume, complex structure, large mixing light distance, high production cost, and inability to control light in zones of the application system.

[0008] The integrated optical lens of the present invention is realized as follows: it includes a lower optical interface for inputting light and an upper optical interface for outputting light;

[0009] The upper optical interface is a free - form surface that is concave in the central area towards the direction close to the lower optical interface and convex in the four - side edge area towards the direction away from the lower optical interface; the curvature of the upper optical interface gradually decreases from the center to the four - side edge.

[0010] Furthermore, the upper optical interface intersects with the XZ plane at a first curve; the upper optical interface intersects with the plane composed of the 30° axis and the Z axis at a second curve; the upper optical interface intersects with the plane composed of the 45° axis and the Z axis at a third curve; the curvatures of the first curve, the second curve, and the third curve gradually increase in sequence; the lengths of the first curve, the second curve, and the third curve gradually increase in sequence;

[0011] The X-axis, Y-axis, and Z-axis are the three mutually perpendicular axes in a three-dimensional Cartesian coordinate system. The plane formed by the X-axis and Y-axis is defined as the XY plane, the plane formed by the X-axis and Z-axis is defined as the XZ plane, and the plane formed by the Y-axis and Z-axis is defined as the YZ plane.

[0012] In the XY plane, the axis that forms a 30° angle with the X-axis is defined as the 30° axis, the axis that forms a 45° angle with the X-axis is defined as the 45° axis, and the axis that forms a 60° angle with the X-axis is defined as the 60° axis.

[0013] The XY plane is parallel to the top-down projection plane of the upper optical interface.

[0014] Furthermore, the upper optical interface intersects with the plane formed by the 60° axis and the Z-axis at a fourth curve; the upper optical interface intersects with the YZ plane at a fifth curve; the curvatures of the fifth curve, the fourth curve, and the third curve gradually increase in sequence; the lengths of the fifth curve, the fourth curve, and the third curve gradually increase in sequence.

[0015] Furthermore, the outer contour line of the projection of the upper optical interface in the XY plane is a rectangle or a rectangle-like shape with an arc chamfer.

[0016] Furthermore, the lower optical interface is a plane or a free-form surface.

[0017] An LED light source device using an integrated optical lens further includes a bracket connected to the four peripheral edges of the lower surface of the integrated optical lens. A light-emitting chip is fixed on the bracket, and a cavity structure is provided between the bracket and the lower optical interface.

[0018] Furthermore, the upper surface of the light-emitting chip is covered with a light-transmitting adhesive layer.

[0019] Furthermore, the light-transmitting adhesive layer is a fluorescent adhesive layer.

[0020] Furthermore, the four peripheral side surfaces of the light-emitting chip or the four peripheral side surfaces of the light-emitting chip and the light-transmitting adhesive layer are covered with a highly reflective adhesive layer.

[0021] Compared with the prior art, the integrated optical lens provided by the present invention and the LED light source device using the integrated optical lens have the following beneficial effects:

[0022] 1. The upper optical interface of the integrated optical lens of the present invention is set as a free-form surface with a concave central region and a convex peripheral edge region, and the curvature of the upper optical interface gradually decreases from the center to the peripheral edge. The strong light in the central region is refracted towards the peripheral edge region to achieve the effect of light homogenization. At the same time, by setting the curvature of the upper optical interface, the divergence angle of the outgoing light is effectively controlled to meet the angular requirements of the application scenario. Compared with the traditional backlight source, the present invention realizes uniform light output from a single light source through the surface shape setting of the integrated optical lens, without the need for superposition of multiple light sources, and thus realizes zonal control; in addition, the integrated optical lens of the present invention can achieve the preset optical shaping effect without adding a secondary light distribution lens, and the volume is greatly reduced, making the structure of the backlight structure simple, smaller and thinner.

[0023] 2. The upper optical interface has different lengths and curvatures on the X-axis, 30° axis, 45° axis, 60° axis and Y-axis. The curvatures of the first curve, the second curve and the third curve gradually increase in turn, and the lengths gradually increase in turn; the curvatures of the fifth curve, the fourth curve and the third curve gradually increase in turn, and the lengths gradually increase in turn, ensuring uniform light output at different angles and meeting the preset outgoing light angles, thereby ensuring the brightness uniformity of the entire light spot.

[0024] 3. The LED light source device using the integrated optical lens of the present invention has a built-in light shape shaping lens and does not need to add a secondary light distribution lens, achieving a small volume and a good shaping effect. Furthermore, 1. the mixing distance is greatly reduced, thereby reducing the thickness of the backlight module and the backlight display screen, while simplifying the structure of the backlight module and the backlight display screen, and greatly saving production costs; 2. the light emission of a single LED light source device is uniform, and does not rely on the superposition of the light of multiple LED light source devices in an array to achieve the uniformity of the overall brightness, saving the number of LED light source devices, and at the same time realizing the zonal light control function. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic cross-sectional structure diagram of the integrated optical lens provided by the present invention;

[0026] Figure 2 is a top view of the integrated optical lens provided by the present invention;

[0027] Figure 3 is a schematic cross-sectional structure diagram of the integrated optical lens in the XZ plane provided by the present invention;

[0028] Figure 4 is provided by the present invention Figure 2 A cross-sectional structure diagram in the A-A direction;

[0029] Figure 5 is provided by the present invention Figure 2 A cross-sectional structure diagram in the B-B direction;

[0030] Figure 6 is the schematic cross-sectional structure diagram in the C-C direction provided by the present invention; Figure 2

[0031] Figure 7 is the schematic cross-sectional structure diagram of the YZ plane of the integrated optical lens provided by the present invention;

[0032] Figure 8 is the comparison diagram of the first curve, the second curve and the third curve provided by the present invention;

[0033] Figure 9 is the comparison diagram of the third curve, the fourth curve and the fifth curve provided by the present invention;

[0034] Figure 10 is the schematic three-dimensional structure diagram of the LED light source device provided by the present invention;

[0035] Figure 11 is the schematic cross-sectional structure diagram of the LED light source device provided by the present invention;

[0036] Figure 12 is the optical path diagram of the XZ plane of the LED light source device provided by the present invention;

[0037] Figure 13 is the optical path diagram of the LED light source device in the plane composed of the 45° axis and the Z axis provided by the present invention;

[0038] Figure 14 is the optical path diagram of the YZ plane of the LED light source device provided by the present invention.

[0039] In the figure: 1 - integrated optical lens; 11 - lower optical interface; 12 - upper optical interface; a - first curve; b - second curve; c - third curve; d - fourth curve; e - fifth curve; 2 - bracket; 21 - cavity structure; 3 - light-emitting chip; 4 - light-transmitting adhesive layer; 5 - high-reflection adhesive layer. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0042] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Referring to Figure 1-14 as shown, it is a preferred embodiment provided by the present invention.

[0044] Referring to Figure 1 , the integrated optical lens 1 includes a lower optical interface 11 for inputting light and an upper optical interface 12 for outputting light. The upper optical interface 12 is a free-form surface. The central area of the upper optical interface 12 is recessed towards the direction close to the lower optical interface 11, and the four peripheral areas of the upper optical interface 12 are convex towards the direction away from the lower optical interface 11. The central area and the four peripheral areas are connected by a smooth curved surface. The lower optical interface 11 is a plane or a micro-arc surface or a free-form surface. The light intensity of natural light gradually weakens from the center to the periphery. The upper optical interface 12 is set with a concave middle area and convex four peripheries, so that the strong light in the center is refracted towards the four peripheral directions, making the light distribution more uniform. The curvature of the upper optical interface 12 is set to gradually decrease from the central area to the four peripheral areas, so that the deflection angle of light is larger in the middle area and gradually decreases from the middle area to the four peripheral areas. While ensuring the light output uniformity, it effectively controls the divergence angle of the light output, well meeting the requirements of the application scenario. Compared with the traditional backlight source, the present invention realizes the uniform light emission of a single light source through the surface shape setting of the integrated optical lens 1, without the need to achieve it through the superposition of multiple light sources, and then realizes zonal control. In addition, the integrated optical lens 1 of the present invention can achieve the preset optical shaping effect without adding a secondary light distribution lens, and the volume is greatly reduced, making the backlight structure simple in structure, smaller and thinner in size.

[0045] The four peripheral sides of the integrated optical lens 1 are connected to the four peripheries of the upper optical interface 12 and the lower optical interface 11. The four peripheral sides of the integrated optical lens 1 are preferably set as smooth curved surfaces. The cross-section surrounded by the four peripheral sides of the integrated optical lens 1 increases from the upper optical interface 12 towards the lower optical section 11. This structure is beneficial for demolding and processing, improving the yield of finished products; in addition, it can reduce the friction between finished products and improve the appearance yield of products.

[0046] Referring to Figure 2-7, the X-axis, Y-axis, and Z-axis are the three mutually perpendicular axes in a three-dimensional Cartesian coordinate system. The plane formed by the X-axis and Y-axis is defined as the XY plane, the plane formed by the X-axis and Z-axis is defined as the XZ plane, and the plane formed by the Y-axis and Z-axis is defined as the YZ plane. In the XY plane, the axis that makes an angle of 30° with the X-axis is defined as the 30° axis, the axis that makes an angle of 45° with the X-axis is defined as the 45° axis, and the axis that makes an angle of 60° with the X-axis is defined as the 60° axis. It is defined that the XY plane is parallel to the top-down projection plane of the upper optical interface 12.

[0047] The upper optical interface 12 intersects the XZ plane at the first curve a, intersects the plane formed by the 30° axis and the Z-axis at the second curve b, and intersects the plane formed by the 45° axis and the Z-axis at the third curve c. The first curve a, the second curve b, and the third curve c are all curves that are concave in the central area towards the direction close to the lower optical interface 11 and convex in the peripheral edge area away from the lower optical interface 11, that is, in the shape of an unfolded wing. The curvatures of the first curve a, the second curve b, and the third curve c gradually increase in sequence, and the lengths of the first curve a, the second curve b, and the third curve c gradually increase in sequence. Refer to Figure 8 . To ensure uniform light emission at different angles and meet the preset divergence angle, corresponding lengths and curvatures are set on the X-axis, 30° axis, 45° axis, 60° axis, and Y-axis, thereby ensuring the brightness uniformity of the entire light spot. Refer to Figure 12-14 the optical path diagram. The light field length of the 45° axis is the longest, and the curvature of the 45° axis is greater than that of the X-axis, 30° axis, 60° axis, and Y-axis, so that the angle of light refraction is larger to meet the brightness uniformity within the preset angle.

[0048] Furthermore, the upper optical interface 12 intersects the plane formed by the 60° axis and the Z-axis at the fourth curve d, and intersects the YZ plane at the fifth curve e. The curvatures of the fifth curve e, the fourth curve d, and the third curve c gradually increase in sequence, and the lengths of the fifth curve e, the fourth curve d, and the third curve c gradually increase in sequence. Refer to Figure 9 . Preferably, the outer contour line of the projection of the upper optical interface 12 in the XY plane is a rectangle or a quasi-rectangle with an arc chamfer, which can form a rectangular or quasi-rectangular light field with uniform brightness.

[0049] Refer to Figure 10-11, for the LED light source device adopting the integrated optical lens 1 of the present invention, it further includes a bracket 2 connected to the four peripheral edges of the lower surface of the integrated optical lens 1. A light-emitting chip 3 is fixed on the bracket 2. The bracket 2 is used to support the integrated optical lens 1 and package the light-emitting chip 3. A cavity structure 21 for accommodating the light-emitting chip 3 and light propagation is provided between the bracket 2 and the lower optical interface 11. To meet the requirements of specific application scenarios, a light-transmitting glue layer 4 and a high-reflection glue layer 5 are provided in the cavity structure 21. The light-transmitting glue layer 4 at least covers the upper surface of the light-emitting chip 3. The four peripheral sides of the light-emitting chip 3 or the four peripheral sides of the light-emitting chip 3 and the light-transmitting glue layer 4 are covered with the high-reflection glue layer 5. The light-transmitting glue layer 4 can be a fluorescent glue layer. There is also a gold wire for electrically connecting the bracket 2 and the light-emitting chip 3. In the case where the light-transmitting glue layer 4 and the high-reflection glue layer 5 are provided, preferably one end of the gold wire extends into the light-transmitting glue layer 4 and the other end extends into the high-reflection glue layer 5. The LED light source device preferably forms a rectangular or quasi-rectangular light field. By arraying multiple LED light source devices, a large-sized spliced light field is formed. The number of LED light source devices used in the present invention to form a light field of the same area is less than that of the traditional ones, and the brightness of the light field is more uniform. Since the light field uniformity formed by a single LED light source device is high and does not rely on the superposition of light sources, it can be controlled in different regions. In addition, because there is no need to configure a secondary lens, the mixing distance is greatly reduced, thereby reducing the thickness of the backlight module and the backlight display screen. At the same time, the structure of the backlight module and the backlight display screen is simplified, and the production cost is greatly saved.

[0050] The present invention is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated optical lens, characterized in that, it includes a lower optical interface (11) for inputting light rays and an upper optical interface (12) for outputting light rays; the upper optical interface (12) is a free-form surface that is recessed in the central area towards the lower optical interface (11) and convex in the four peripheral edge areas away from the lower optical interface (11); the curvature of the upper optical interface (12) gradually decreases from the center to the four peripheries.

2. The integrated optical lens according to claim 1, characterized in that, the upper optical interface (12) intersects the XZ plane at a first curve (a); the upper optical interface (12) intersects the plane formed by the 30° axis and the Z axis at a second curve (b); the upper optical interface (12) intersects the plane formed by the 45° axis and the Z axis at a third curve (c); the curvatures of the first curve (a), the second curve (b), and the third curve (c) gradually increase in sequence; the lengths of the first curve (a), the second curve (b), and the third curve (c) gradually increase in sequence; the X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes. The plane formed by the X-axis and the Y-axis is defined as the XY plane, the plane formed by the X-axis and the Z-axis is defined as the XZ plane, and the plane formed by the Y-axis and the Z-axis is defined as the YZ plane; the axis at an angle of 30° with the X-axis in the XY plane is defined as the 30° axis, the axis at an angle of 45° with the X-axis is defined as the 45° axis, and the axis at an angle of 60° with the X-axis is defined as the 60° axis; the XY plane is parallel to the top view projection plane of the upper optical interface (12).

3. The integrated optical lens according to claim 2, characterized in that, the upper optical interface (12) intersects the plane formed by the 60° axis and the Z axis at a fourth curve (d); the upper optical interface (12) intersects the YZ plane at a fifth curve (e); the curvatures of the fifth curve (e), the fourth curve (d), and the third curve (c) gradually increase in sequence; the lengths of the fifth curve (e), the fourth curve (d), and the third curve (c) gradually increase in sequence.

4. The integrated optical lens according to claim 1, characterized in that, the outer contour line of the projection of the upper optical interface (12) in the XY plane is a rectangle or a quasi-rectangle with an arc chamfer.

5. The integrated optical lens according to claim 1, characterized in that, the lower optical interface (11) is a plane or a free-form surface.

6. An LED light source device, characterized in that, it adopts the integrated optical lens according to any one of claims 1-5, and further includes a bracket (2) connected to the four peripheral edges of the lower surface of the integrated optical lens. A light-emitting chip (3) is fixed on the bracket (2), and a cavity structure (21) is provided between the bracket (2) and the lower optical interface (11).

7. The LED light source device according to claim 6, characterized in that, a light-transmitting glue layer (4) is covered on the upper surface of the light-emitting chip (3).

8. The LED light source device according to claim 7, characterized in that, the light-transmitting glue layer (4) is a fluorescent glue layer.

9. The LED light source device according to claim 7, characterized in that, The peripheral side surfaces of the light-emitting chip (3) or the peripheral side surfaces of the light-emitting chip (3) and the light-transmitting adhesive layer (4) are covered with a high-reflection adhesive layer (5).

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