CN216286136U - Micro LED-based projection device and mobile phone comprising same - Google Patents

Abstract

The utility model discloses a micro LED-based projection device and a mobile phone comprising the same, and belongs to the technical field of semiconductor display. The method comprises the following steps: the micro LED array light source comprises a light source consisting of a plurality of micro LED arrays on a circuit board, a collimator arranged on a light source emergent light path and corresponding to the micro LED arrays, and a projection lens correspondingly arranged on a collimator external light path and suitable for projecting and imaging images. According to the utility model, the Micro LED is adopted to replace the conventional RGB three-way LED as the light source, and the Micro LED has the advantages of simple structural principle, high efficiency, high brightness, high reliability, quick response time and the like, so that the volumes of the light source and the projection device can be greatly reduced, and the requirement of being installed on a mobile phone can be met.

Description

Micro LED-based projection device and mobile phone comprising same

Technical Field

The utility model belongs to the technical field of semiconductor display, and particularly relates to a micro LED-based projection device and a mobile phone comprising the same.

Background

Projectors have been widely used in various fields such as business and teaching as a display device capable of providing shared viewing by a plurality of persons. However, the existing projectors are generally large in size and high in power consumption, and therefore, the application thereof is limited. With the continuous development of projection display technology and market demand, the wearable micro projection light engine with large view field, high imaging quality and small volume receives more and more attention, and the application of the projector is greatly expanded. Projection device mountable on cell-phone projection device on cell-phone, will be a great trend of development in the future.

The size of the micro projection is difficult to reduce due to the limit of the structure of the existing micro projection device. For example, the light source, in the prior art, RGB three-way LEDs are generally used as the light source of the projector, and the light source of the projector is driven by using an LED driving chip. However, due to the size of the LED, it is difficult to meet the market demand for small-sized and light-weight micro projection optical devices, and it is difficult to directly mount the device on the mobile phone housing.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defects, the utility model provides a micro LED-based projection device and a mobile phone comprising the same, so as to solve the problems related to the background art.

The utility model provides a micro LED-based projection device, which comprises: the micro LED array light source comprises a light source consisting of a plurality of micro LED arrays on a circuit board, a collimator arranged on a light source emergent light path and corresponding to the micro LED arrays, and a projection lens correspondingly arranged on a collimator external light path and suitable for projecting and imaging images.

Preferably or optionally, reflective separation grooves are arranged between the single micro LED chips in the micro LED array.

Preferably or optionally, the micro LED can emit light with three different wavelengths of 620-625 nm, 520-525 nm and 465-475 nm.

Preferably or optionally, the switching frequency of the micro LED array is greater than 180 Hz.

Preferably or optionally, the collimator is a micro lens array and a focusing lens arranged along the light path emitted by the light source, and is adapted to form a parallel light exit.

Preferably or optionally, a transparent adhesive layer is arranged between the light source and the collimator and is suitable for fixing the collimator on the light source.

Preferably or optionally, the light source has a size of less than 2cm x 2 cm.

The utility model also provides a mobile phone comprising the projection device.

Preferably or optionally, the projection device is mounted inside the mobile phone shell by using a telescopic driving unit, and the projection device is hidden inside the mobile phone shell.

Preferably or optionally, the telescopic drive unit comprises: the mobile phone comprises a mobile phone shell, a containing cavity, sliding grooves, a micro motor and a lead screw, wherein the containing cavity is arranged on the mobile phone shell, the sliding grooves are formed in two sides of the containing cavity, the micro motor is arranged in the mobile phone shell, the lead screw is connected with the micro motor, and the sliding seat is sleeved on the lead screw through a ball bearing, embedded in the sliding grooves in two sides and used for installing the projection device.

The utility model relates to a micro LED-based projection device and a mobile phone comprising the same, compared with the prior art, the micro LED-based projection device has the following beneficial effects: by adopting the Micro LED to replace the conventional RGB three-way LED as the light source, the Micro LED has the advantages of simple structure principle, high efficiency, high brightness, high reliability, fast reaction time and the like, and can greatly reduce the volume of the light source, thereby greatly reducing the volume of the projection device and meeting the requirement of being installed on a mobile phone.

Drawings

Fig. 1 is a schematic diagram of the optical path propagation in the projection apparatus of the present invention.

Fig. 2 is a schematic structural diagram of a projection apparatus according to the present invention.

Fig. 3 is a schematic view of the structure of the light source of the present invention.

FIG. 4 is a schematic structural diagram of a micro LED chip in the present invention.

Fig. 5 is a schematic structural diagram of a mobile phone including the projection apparatus according to the present invention.

Fig. 6 is a partially enlarged view of the telescopic drive unit of the present invention.

The reference signs are: the mobile phone comprises a projection device 100, a light source 110, a collimator 120, a projection lens 130, a reflection separation groove 150, an adhesive layer 160, a blue micro LED light emitter 111, a cured transparent adhesive 112, a cured transparent adhesive 113 mixed with red light quantum dots, a cured transparent adhesive 114 mixed with green light quantum dots, a mobile phone shell 200, a containing cavity 210, a sliding groove 220, a micro motor 230, a screw rod 240 and a sliding seat 250.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

Example 1

Referring to fig. 1 to 4, a micro LED based projection apparatus 100 includes: the light source device comprises a projection device 100, a light source 110, a collimator 120, a projection lens 130, a reflection separation groove 150, an adhesive layer 160, a blue micro LED light emitter 111, a cured transparent adhesive 112, a cured transparent adhesive 113 mixed with red light quantum dots, and a cured transparent adhesive 114 mixed with green light quantum dots.

Referring to fig. 1 to 2, the light source 110 is composed of a plurality of micro LED arrays on a circuit board, and the size of the light source 110 is less than 2cm × 2 cm. The central light intensity of a single micro LED light beam is high, and the peripheral light intensity is low; moreover, the Micro LEDs are spaced apart from each other by a small distance, so that crosstalk between light beams of adjacent Micro LED chips occurs, and thus, the pixel of the projection apparatus 100 is distorted. Therefore, referring to fig. 3, a reflective separation groove 150 is arranged between the single micro LED chips in the micro LED array, the reflective separation groove 150 is an opaque colloid, and then a metal reflective film is plated on the surface of the colloid. The collimator 120 is disposed on the emergent light path of the light source 110, and is in one-to-one correspondence with the chips on the micro LED array, and a transparent adhesive layer 160 is disposed between the light source 110 and the collimator 120, so as to fix the collimator 120 on the light source 110. The collimator 120 is a micro lens array and a focusing lens arranged along a light path emitted by the light source 110, and is suitable for forming parallel light to be emitted, the uniformity of the emitted light is good, the light divergence angle is small, and the projection stability is improved. The projection lens 130 is correspondingly disposed outside the collimator 120, and finally, an image can be projected through the projection lens 130 and directly projected onto a wall or a curtain for projection. The working principle is the same as that of the liquid crystal display, and the details are not repeated herein. The micro projector has a simple structure and a compact volume, and can be installed on a mobile phone.

In a further example, referring to fig. 4, the micro LED chip includes: evenly set up three blue light micro LED luminous element 111 on the transparent substrate 100, wherein, three blue light micro LED luminous element 111's surface covers respectively has solidification transparent adhesive tape 112, mixes the solidification transparent adhesive tape 113 of ruddiness quantum dot, mixes the solidification transparent adhesive tape 114 of green light quantum dot. The micro LED chip can emit light with three different wavelengths of 620-625 nm, 520-525 nm and 465-475 nm. Compared with the existing RGB ternary micro LED, the LED has the advantages of simple structure, strong replaceability and cost saving.

In a further embodiment, the switching frequency of the micro LED array is larger than 180 Hz. Due to the visual inertia of the human eye, when the switching variation of the micro LED array exceeds 180Hz, a continuously varying image can be formed in the human eye.

For the convenience of understanding the technical solution of the micro LED-based projection apparatus 100, the operation principle thereof will be briefly described: because Micro LED replaces the existing conventional RGB three-way LED as the light source 110, the Micro LED has the advantages of simpler structural principle, high efficiency, high brightness, high reliability, fast reaction time and the like, the size of the light source 110 can be greatly reduced, and then the size of the projection device 100 is greatly reduced so as to meet the requirement of being installed on a mobile phone. In addition, the reflective separation grooves 150 are formed between the single Micro LED chips, so that the interference between the light beams of the adjacent Micro LED chips is avoided, and the display quality of the projection device 100 is improved.

Example 2

The present embodiment provides a mobile phone, based on embodiment 1, with reference to fig. 5 to 6, where the mobile phone includes: the motor comprises a shell 200, an accommodating cavity 210, a sliding chute 220, a micro motor 230, a screw rod 240 and a sliding seat 250.

The projection device 100 is mounted on a smart phone. On one hand, in order to ensure the aesthetic property of the mobile phone; on the other hand, to avoid unnecessary collision of the projection apparatus 100, the internal parts are damaged. The projection device 100 is installed inside the mobile phone housing by using a telescopic driving unit, and the projection device 100 is hidden in the mobile phone housing 200. Wherein, with reference to fig. 6, the telescopic drive unit comprises: the mobile phone comprises a containing cavity 210 arranged on the mobile phone shell, sliding grooves 220 arranged on two sides of the containing cavity 210, a micro motor 230 arranged inside the mobile phone shell, a screw rod 240 connected with the micro motor 230, and a sliding seat 250 which is sleeved on the screw rod 240 through a ball bearing, is embedded in the sliding grooves 220 on two sides and is used for installing the projection device 100.

For the convenience of understanding the technical solution of the mobile phone including the projection apparatus 100, the operation principle thereof will be briefly described: the micro motor 230 is connected to a control unit of the mobile phone, and after receiving an opening instruction from a user, the micro motor 230 drives the screw 240 to rotate, and the rotation is converted into a linear motion through the ball bearing, so as to drive the sliding seat 250 and the projection apparatus 100 to slide up and down along the accommodating cavity 210, thereby extending out and hiding the projection apparatus 100. When a user needs to use the projection device 100, the projection device 100 can protrude from the accommodating cavity, and when the user does not need the projection device 100, the projection device 100 is hidden in the accommodating cavity. On one hand, the appearance of the mobile phone is more attractive, on the other hand, the problem that the projection device 100 is exposed outside the mobile phone and is easy to damage is solved, and the use experience of a user is improved.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.

Claims (10)

1. A micro LED-based projection device, comprising: the micro LED array light source comprises a light source consisting of a plurality of micro LED arrays on a circuit board, a collimator arranged on a light source emergent light path and corresponding to the micro LED arrays, and a projection lens correspondingly arranged on a collimator external light path and suitable for projecting and imaging images.

2. A micro LED based projection device according to claim 1, wherein reflective separation grooves are provided between the individual micro LED chips in the micro LED array.

3. A micro LED based projection device according to claim 2, wherein the micro LED is capable of emitting light of three different wavelengths 620-625 nm, 520-525 nm, 465-475 nm.

4. A micro LED based projection device according to claim 1, wherein the switching frequency of the micro LED array is larger than 180 Hz.

5. A micro LED based projection device according to claim 1, wherein said collimator is a micro lens array and a focusing lens arranged along the light path of said light source, adapted to form a parallel light exit.

6. A micro LED based projection device according to claim 4, wherein a transparent adhesive layer is arranged between the light source and the collimator, adapted to fix the collimator on the light source.

7. Micro LED based projection device according to claim 1, wherein the light source has dimensions of less than 2cm x 2 cm.

8. A mobile phone comprising the projection device of any one of claims 1 to 7.

9. The mobile phone of claim 8, wherein the projection device is mounted inside the mobile phone housing by using a telescopic driving unit, so that the projection device is hidden inside the mobile phone housing.

10. The handset according to claim 9, wherein the telescopic drive unit comprises: the mobile phone comprises a mobile phone shell, a containing cavity, sliding grooves, a micro motor and a lead screw, wherein the containing cavity is arranged on the mobile phone shell, the sliding grooves are formed in two sides of the containing cavity, the micro motor is arranged in the mobile phone shell, the lead screw is connected with the micro motor, and the sliding seat is sleeved on the lead screw through a ball bearing, embedded in the sliding grooves in two sides and used for installing the projection device.

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