TWI715401B - Display incorporating optical identification function - Google Patents

Abstract

A display incorporating an optical identification function includes a circuit substrate, a plurality of pixel micro LEDs of different colors, a plurality of infrared micro LEDs, a plurality of optical sensing elements, a flat transparent member, and a plurality of pinhole imaging elements. The flat transparent member covers the pixel micro LEDs, the infrared micro LEDs, and the optical sensing elements. The pinhole imaging elements are located on the flat transparent member. Each optical sensing element senses lights that are reflected from the object to be tested and emitted from the infrared micro-light emitting diode chips and transmitted via a corresponding one of the pinhole imaging elements.

Description

Display with integrated optical recognition function

The content of the present invention relates to a display, and in particular to a display that integrates an optical recognition function.

Traditional devices for identifying human veins are still large, heavy, and expensive modules, which are unfavorable to be applied to portable or wearable mobile electronic devices. Therefore, there is a need to provide an improved biometric identification device to solve the problems faced by the conventional technology.

An embodiment of this specification provides a display with integrated optical recognition function, which includes a circuit substrate, a plurality of pixel micro-light-emitting diode chips of different colors, a plurality of infrared micro-light-emitting diode chips, a plurality of optical sensing elements, and a flat panel Pieces and plural pinhole imaging elements. The flat light-transmitting member covers the pixel micro-light-emitting diode chips, the infrared micro-light-emitting diode chips, and the optical sensing elements. The pinhole imaging elements are arranged on the flat light-transmitting part. Each optical sensing element passes through one of the pinhole imaging elements to sense the light emitted by the infrared micro light emitting diode chips from the object under test.

In other embodiments of this specification, the vertical projection of each pinhole imaging element on the circuit substrate does not cover the pixel micro light emitting diode chip.

In other embodiments of this specification, the vertical projection of each pinhole imaging element on the circuit substrate does not cover the infrared micro light emitting diode chips.

In other embodiments of this specification, the pixel micro light emitting diode chips include red, green and blue pixel micro light emitting diode chips.

In other embodiments of this specification, the optical sensing devices are complementary metal oxide semiconductor devices.

In other embodiments of this specification, the flat light-transmitting member has a uniform thickness.

In other embodiments of this specification, each optical sensor element is aligned with one of the pinhole imaging elements.

In other embodiments of the present specification, each optical sensing element is surrounded by the adjacent one of the infrared micro LED chips and the adjacent ones of the pixel micro LED chips.

In other embodiments of this specification, the width of each pixel of the micro light emitting diode chip ranges from 1 micrometer to 100 micrometers.

In other embodiments of this specification, the width of each infrared micro light emitting diode chip ranges from 1 micrometer to 100 micrometers.

In summary, the light-emitting diode display with integrated optical identification function of the present invention integrates pixel micro-light-emitting diode chips, infrared micro-light-emitting diode chips, and micro-optical sensing elements on a circuit substrate, and is modified to Miniature pinhole imaging elements replace curved optical lenses to reduce the overall thickness of the display. Therefore, the display can integrate the optical recognition function into it, and it can be applied to portable or wearable mobile electronic devices with a small volume.

Hereinafter, the above description will be described in detail by way of implementation, and further explanation will be provided for the technical solution of the present invention.

Please refer to Figures 1 and 2 at the same time. Figure 1 is a schematic diagram of a light-emitting diode display with integrated optical recognition function according to an embodiment of the present invention (with flat light-transmitting parts and pinhole imaging elements removed), FIG. 2 is a schematic cross-sectional view of a light-emitting diode display with integrated optical recognition function according to an embodiment of the present invention.

The light emitting diode display 100 includes a plurality of pixel micro light emitting diode chips of different colors (for example, red micro light emitting diode chip 106R, green micro light emitting diode chip 106G, and blue micro light emitting diode chip 106B), as Its display pixels to achieve its display function. The optical recognition function of the display additionally realizes related functions through the optical sensing element 104, the infrared micro light emitting diode chip 108, and the pinhole imaging element 112.

In this embodiment, the optical sensing element 104 may be a complementary metal oxide semiconductor element (CMOS sensor), but it is not limited to this.

In this embodiment, each optical sensing element 104 is connected to the infrared micro light emitting diode chip 108 and the adjacent red micro light emitting diode chip 106R, green micro light emitting diode chip 106G, and blue micro light emitting diode chip. The polar body chip 106B is surrounded, but not limited to this.

Specifically, the aforementioned chips and components are all disposed on the circuit substrate 102 to obtain power and be controlled by their related functions. The circuit substrate 102 may be a printed circuit board or a flexible circuit board, but is not limited to this.

The so-called "micro" here means that the size of these chips are all in the micron level. Specifically, the width W2 of the pixel micro light emitting diode chip 106 ranges from 1 micrometer to 100 micrometers, and the width W3 of the infrared micro light emitting diode chip 108 ranges from 1 micrometer to 100 micrometers. The size of the optical sensing element 104 can also be on the order of micrometers, that is, the width W1 of the optical sensing element 104 also ranges from 1 micrometer to 100 micrometers.

After the above-mentioned chips and components are solidified on the circuit substrate 102, the chips and components are sealed with encapsulant 109 (for example, optically transparent glue) to prevent moisture, and then the flat transparent member 110 is covered on the encapsulant 109 . In this embodiment, the flat transparent member 110 has a uniform thickness T, but it is not limited to this.

A plurality of micro pinhole imaging elements 112 are provided on the flat light-transmitting member 110. Each pinhole imaging element 112 is aligned with an optical sensing element 104. In other words, the vertical projection of each pinhole imaging element 112 on the circuit substrate 102 covers or overlaps the optical sensing element 104. Therefore, each optical sensing element 104 senses the infrared micro light emitting diode chip 108 emitted from the object 150 (such as the vein tissue under the skin of the human body) reflected by the corresponding pinhole imaging element 112 (the pinhole 112a) The light can sense the partial image of the object 150 under test. The array of multiple optical sensing elements 104, multiple infrared micro light emitting diode chips 108 and multiple pinhole imaging elements 112 on the circuit substrate 102 can perform large-area sensing and vein recognition of the test object 150 Or non-contact identification.

The pinhole imaging element 112 projects the image of the test object 150 to the optical sensing element 104 based on the pinhole imaging principle. The pinhole imaging element 112 is light-blocking except for the pinhole 112a, so it is necessary to control its proportion to the surface of the flat light-transmitting member 110.

Although a plurality of pinhole imaging elements 112 are provided on the flat light-transmitting member 110, the proportion of the pinhole imaging element 112 that only occupies a small part of the surface of the flat light-transmitting member 110 can be controlled so that the pinhole imaging element 112 will not affect the micro-luminescence of pixels The imaging function of the diode chip (for example, the red micro light emitting diode chip 106R, the green micro light emitting diode chip 106G, and the blue micro light emitting diode chip 106B). In this embodiment, the vertical projection of each pinhole imaging element 112 on the circuit substrate 102 does not cover any pixel micro light emitting diode chip 106, but it is not limited to this. In this embodiment, the vertical projection of each pinhole imaging element 112 on the circuit substrate 102 does not cover any infrared micro light emitting diode chip 108, but it is not limited to this.

Please refer to FIG. 3, which shows a schematic diagram of the application of the wristband with integrated optical identification function according to an embodiment of the present invention. When the aforementioned display with integrated optical recognition function is applied to the wristband 200, it can be used to sense the biological characteristics of the vein tissue of the hand 160, and various related applications can be achieved.

Please refer to FIG. 4, which illustrates an application schematic diagram of a mobile phone with integrated optical recognition function according to an embodiment of the present invention. When the aforementioned display with integrated optical recognition function is applied to the mobile phone 300, its screen 302 can be used to sense the biological characteristics of the vein tissue of the hand 160, and various related applications can be achieved.

Please refer to FIG. 5, which illustrates an application schematic diagram of an access control device with integrated optical identification function according to an embodiment of the present invention. When the aforementioned display with integrated optical recognition function is applied to the access control device 400, its panel 402 can be used to sense the biological characteristics of the vein tissue of the hand 160, and various related applications can be achieved.

In summary, the light-emitting diode display with integrated optical identification function of the present invention integrates pixel micro-light-emitting diode chips, infrared micro-light-emitting diode chips, and micro-optical sensing elements on a circuit substrate, and uses micro-needles. The aperture imaging element replaces the curved optical lens, thereby reducing the overall thickness of the display. Therefore, the display can integrate the optical recognition function into it, and it can be applied to portable or wearable mobile electronic devices with a small volume.

Although the present invention has been invented by the preferred embodiment as described above, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to those defined by the attached patent scope.

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the description of the attached symbols is as follows: 100: display 102: circuit board 104: Optical sensing element 106: Pixel micro light emitting diode chip 106R: Red miniature LED chip 106G: Green micro light emitting diode chip 106B: blue miniature light emitting diode chip 108: Infrared micro light emitting diode chip 109: Encapsulation glue 110: Flat transparent parts 112: Pinhole imaging element 112a: pinhole 150: DUT 160: hand 200: Wristband 300: mobile phone 302: screen 400: Access control device 402: Panel T: thickness W1: width W2: width W3: width

In order to make the above and other objectives, features, advantages and embodiments of the present invention more comprehensible, the description of the accompanying drawings is as follows: FIG. 1 is a schematic diagram of a miniature light-emitting diode display integrated with an optical recognition function according to an embodiment of the present invention; and Figure 2 is a schematic cross-sectional view of a miniature light emitting diode display with integrated optical recognition function according to an embodiment of the present invention; Figure 3 is a schematic diagram showing the application of a wristband with integrated optical identification function according to an embodiment of the present invention; Fig. 4 is a schematic diagram of the application of a mobile phone with integrated optical recognition function according to an embodiment of the present invention; and FIG. 5 is a schematic diagram showing the application of an access control device with integrated optical identification function according to an embodiment of the present invention.

100: display

102: circuit board

104: Optical sensing element

106: Pixel micro light emitting diode chip

108: Infrared micro light emitting diode chip

109: Encapsulation glue

110: Flat transparent parts

112: Pinhole imaging element

112a: pinhole

150: DUT

T: thickness

W1: width

W2: width

W3: width

Claims (7)

A display with integrated optical identification function, comprising: a circuit substrate; a plurality of pixel micro light emitting diode chips of different colors are arranged on the circuit substrate, wherein the width of each pixel micro light emitting diode chip ranges from 1 micron to 100 Micrometers; a plurality of infrared micro light emitting diode chips are arranged on the circuit substrate, wherein the width of each of the infrared micro light emitting diode chips ranges from 1 micron to 100 micrometers; a plurality of optical sensing elements are arranged on the circuit substrate, The width of each of the optical sensing elements ranges from 1 micron to 100 micrometers; the flat light-transmitting part covers the pixel micro LED chips, the infrared micro LED chips, and the optical sensors On the device, the pixel micro-light-emitting diode chips, the infrared micro-light-emitting diode chips, and the optical sensing elements are located between the circuit substrate and the flat light-transmitting part; and a plurality of pinhole imaging elements, Disposed on the flat light-transmitting member, wherein each of the optical sensing elements is aligned with one of the pinhole imaging elements, and each of the optical sensing elements is corresponding to one of the pinhole imaging elements Furthermore, to sense the light emitted by the infrared micro light-emitting diode chips from the object under test, each of the pinhole imaging elements is exposed on the flat light-transmitting part to directly receive the light reflected by the object under test Light. The display according to claim 1, wherein the vertical projection of each pinhole imaging element on the circuit substrate does not cover the pixel micro light emitting diodes Body wafer. The display according to claim 1, wherein the vertical projection of each pinhole imaging element on the circuit substrate does not cover the infrared micro light emitting diode chips. The display according to claim 1, wherein the pixel micro light emitting diode chips comprise red, green and blue pixel micro light emitting diode chips. The display according to claim 1, wherein the optical sensing elements are complementary metal oxide semiconductor elements. The display according to claim 1, wherein the flat light-transmitting member has a uniform thickness. The display according to claim 1, wherein each of the optical sensing elements is surrounded by an adjacent one of the infrared micro light emitting diode chips and a plurality of adjacent ones of the pixel micro light emitting diode chips.

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