CN111381367A - Eyeball tracker and display device - Google Patents

Abstract

The present invention provides an eye tracker, which includes a lens, a beam splitter, a structured light source and an imaging element. The beam splitter is arranged on one side of the lens. The structured light source is arranged between the lens and the beam splitter. The imaging element is arranged between the lens and the beam splitter, wherein the structured light source is used to emit a first light and emit it to the beam splitter, and the first light is reflected from the beam splitter to the lens and passes through the lens to emit to the eyeball. The first light is reflected from the eyeball to form a second light, wherein the second light passes through the lens and emits to the beam splitter, and is reflected from the beam splitter to the imaging element. A display device is also proposed.

Description

Eye Tracker and Display Device

technical field

The invention relates to an eye tracking technology, in particular to an eye tracker and a display device using the eye tracker.

Background technique

Eye tracking technology is usually applied to display devices, so as to obtain changes of the user's eyeballs or the periphery of the eyeballs while the user watches the display device, and to determine the changes of the eyeballs or the periphery of the eyeballs to interact with the display device. In other words, eye-tracking technology can be used to replace existing operating interfaces such as keyboards, mice, trackpads or touch panels.

In most common eye trackers, the light source is disposed around the lens, and the light source is disposed on the side of the lens facing the user's eyeball. Therefore, the light pattern emitted by the light source is limited. In addition, in order to concentrate the light emitted by the light source toward the eyeball, it is necessary to provide a light guide element corresponding to the light source, which is difficult to meet the design requirements of light and thin, and the light source The error in the assembly alignment with the light guide element will affect the accuracy of eye tracking.

SUMMARY OF THE INVENTION

The present invention provides an eye tracker and a display device using the eye tracker, which helps to improve the accuracy of eye tracking.

An eye tracker according to an embodiment of the present invention includes a lens, a beam splitter, a structured light source, and an imaging element. The beam splitter is arranged on one side of the lens. The structured light source is arranged between the lens and the beam splitter. The image capturing element is arranged between the lens and the beam splitter, wherein the structured light source is used to emit a first light beam to the beam splitter. The first light ray is reflected from the eyeball to form the second light ray, wherein the second light ray passes through the lens and goes to the beam splitter, and is reflected from the beam splitter to the imaging element.

A display device according to an embodiment of the present invention includes the above-mentioned eye tracker and a display panel. The display panel is arranged on one side of the beam splitter, and the beam splitter is located between the lens and the display panel.

Based on the above, the eye tracker of the present invention and the display device using the eye tracker adopt the structured light source to track the changes of the eyeball or the periphery of the eyeball, so the accuracy of eyeball tracking can be improved. In addition, because the structured light source is arranged between the lens and the beam splitter, the light emitted by the structured light source is first directed to the beam splitter, and then reflected from the beam splitter to the eyeball. There is no need to install other light guide elements, so it can meet the requirements of light and thin. design requirements.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Description of drawings

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention.

2 and 3 are schematic diagrams of light patterns generated by a structured light source according to an embodiment of the present invention, respectively.

FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention.

【Symbol Description】

10: Eye Tracker

20: Display panel

100, 100A: Display device

101: Lens

1011: First lens end

1012: Second lens end

102: Beamsplitter

1021: First beam splitter end

1022: Second beam splitter end

103: Structured light sources

1031: First Ray

1032: Second Ray

104: Image acquisition element

105: Processor

200: Eyeballs

D1: first distance

D2: second distance

D3: third distance

D4: Fourth distance

G1: first gap

G2: Second Gap

Detailed ways

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. Please refer to FIG. 1 , in this embodiment, the display device 100 includes an eye tracker 10 and a display panel 20 , wherein the eye tracker 10 is disposed on one side of the display panel 20 , and the eye tracker 10 includes a lens 101 and a beam splitter 102 , structured light source 103 and imaging element 104 . The lens 101 , the beam splitter 102 and the display panel 20 are arranged in sequence, that is, the beam splitter 102 is located between the lens 101 and the display panel 20 . The light emitted by the display panel 20 may pass through the beam splitter 102 and the lens 101 in sequence to be directed toward the eyeball 200 of the user.

Specifically, the structured light source 103 is disposed between the lens 101 and the beam splitter 102 , and the image pickup element 104 is disposed between the lens 101 and the beam splitter 102 . The structured light source 103 may be a combination of a laser and a diffractive optical element (DOE), or a combination of other invisible light and a diffractive optical element, which is not limited in the present invention. The structured light source 103 is used for emitting the first light 1031. Due to the arrangement of the diffractive optical element, the first light 1031 has a specific light pattern, and the design of the light pattern depends on the actual application requirements. On the other hand, since the eye tracker 10 of the present embodiment and the display device 100 using the eye tracker 10 use the structured light source 103 to track the changes of the eyeball 200 or the periphery of the eyeball, the eye tracking accuracy can be improved.

2 and 3 are schematic diagrams of light patterns generated by a structured light source according to an embodiment of the present invention, respectively. Referring to FIG. 2 and FIG. 3 , in an embodiment, the light pattern of the first light ray 1031 may be composed of a plurality of solid circles, and these solid circles may be concentric circles. In another embodiment, the light pattern of the first light ray 1031 may be composed of a plurality of dotted circles, and the dotted circles may be concentric circles. In other embodiments, the light pattern may be cross-shaped, or consist of a plurality of juxtaposed solid or dashed stripes, but is not limited thereto.

Please continue to refer to FIG. 1 , the first light 1031 emitted by the structured light source 103 will first go to the beam splitter 102 , and then be reflected from the beam splitter 102 to the lens 101 and pass through the lens 101 to be directed to the eyeball 200 . Afterwards, the first light ray 1031 is reflected from the eyeball 200 to form a second light ray 1032 , wherein the second light ray 1032 passes through the lens 101 and goes toward the beam splitter 102 , and is reflected from the beam splitter 102 toward the imaging element 104 . Since the structured light source 103 is disposed between the lens 101 and the beam splitter 102, the light emitted by the structured light source 103 first goes to the beam splitter 102, and then is reflected from the beam splitter 102 to the eyeball 200, so there is no need to install other light guide elements, so it can meet the Thin and light design requirements.

In this embodiment, the eye tracker 10 further includes a processor 105 , and the structured light source 103 and the imaging element 104 are electrically coupled to the processor 105 . The processor 105 can be a central processing unit (CPU), a system on chip (SOC), or other programmable general-purpose or special-purpose microprocessors (microprocessors), digital signal processors (Digital Signal Processor, DSP), Programmable Controller, Application Specific Integrated Circuits (ASIC), Programmable Logic Device (Programmable Logic Device, PLD), other similar processing devices or combinations of these devices, It is used to control the structured light source 103 to emit light, and to receive and process image signals.

Further, after receiving the second light 1032, the image capturing element 104 converts the second light 1032 into an image signal, and then transmits the image signal to the processor 105. After that, the processor 105 performs processing on the received image signal. Operation processing. Since the change of the eyeball 200 or the periphery of the eyeball will also change the reflected light, the processor 105 compares the light pattern of the outgoing light (ie the first light 1031 ) with the light pattern of the reflected light (ie the second light 1032 ). In order to judge the changes of the eyeball 200 or the periphery of the eyeball.

In this embodiment, the lens 101 has a first lens end 1011 and a second lens end 1012 opposite to each other, and the beam splitter 102 has a first beam splitter end 1021 and a second beam splitter end 1022 opposite to each other. The first beam splitter end 1021 is disposed corresponding to the first lens end 1011 , and the second beam splitter end 1022 is disposed corresponding to the second lens end 1012 . On the other hand, the structured light source 103 and the imaging element 104 are disposed on one side of the second lens end 1012 , and the structured light source 103 is located between the second lens end 1012 and the imaging element 104 . That is to say, the structured light source 103 is closer to the second lens end 1012 than the imaging element 104 .

Specifically, a first gap G1 is formed between the first beam splitter end 1021 and the first lens end 1011 , and a second gap G2 is formed between the second beam splitter end 1022 and the second lens end 1012 . The second gap G2 is larger than the first gap G1 . As shown in FIG. 1 , the beam splitter 102 is inclined to the juxtaposed lens 101 and the display panel 20 . On the other hand, the structured light source 103 and the imaging element 104 are disposed in the second gap G2, wherein the structured light source 103 and the second lens end 1012 are separated by a first distance D1, and the structured light source 103 and the second beam splitter end 1022 are separated by a second distance Distance D2. The imaging element 104 and the second lens end 1012 are separated by a third distance D3, and the imaging element 104 and the second beam splitter end 1022 are separated by a fourth distance D4. The second distance D2 is greater than the first distance D1, the fourth distance D4 is greater than the third distance D3, and the third distance D3 is greater than the first distance D1.

FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention. Referring to FIG. 4 , the display device 100A in this embodiment is substantially the same as the display device 100 in the previous embodiment, and only the differences will be described below. In this embodiment, the imaging element 104 is located between the second lens end 1012 and the structured light source 103 . Further, the third distance D3 between the imaging element 104 and the second lens end 1012 is smaller than the structured light source 103 and the second lens end 1012 . The first distance D1 between the lens ends 1012.

To sum up, the eye tracker of the present invention and the display device using the eye tracker adopt the structured light source to track the changes of the eyeball or the periphery of the eyeball, so the accuracy of eyeball tracking can be improved. In addition, because the structured light source is arranged between the lens and the beam splitter, the light emitted by the structured light source is first directed to the beam splitter, and then reflected from the beam splitter to the eyeball. There is no need to install other light guide elements, so it can meet the requirements of light and thin. design requirements.

Although the present invention has been disclosed above with examples, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the invention shall be determined by the claims.

Claims (10)

1. An eye tracker, characterized in that, comprising: lens; a beam splitter, arranged on one side of the lens; a structured light source, disposed between the lens and the beam splitter; and An image capturing element is arranged between the lens and the spectroscope, wherein the structured light source is used to emit a first light beam to the spectroscope, and the first light beam is reflected from the spectroscope to the spectroscope a lens and pass through the lens to be directed to the eyeball, the first light ray is reflected from the eyeball to form a second light ray, wherein the second light ray passes through the lens and is directed to the beam splitter, and is emitted from the eyeball The beam splitter reflects toward the image pickup element. 2 . The eye tracker of claim 1 , wherein the lens has a first lens end and a second lens end opposite, and the beam splitter has a first beam splitter end and a second beam splitter opposite. 3 . A mirror end, the first beam splitter end is disposed corresponding to the first lens end, and the second beam splitter end is disposed corresponding to the second lens end. 3 . The eye tracker according to claim 2 , wherein a first gap exists between the first end of the beam splitter and the end of the first lens, and the second end of the beam splitter is connected to the end of the first lens. 4 . There is a second gap between the two lens ends, and the second gap is larger than the first gap. 4 . The eye tracker according to claim 3 , wherein the structured light source and the imaging element are disposed in the second gap. 5 . 5 . The eye tracker of claim 4 , wherein the structured light source and the second lens end are separated by a first distance, and the structured light source and the second beam splitter end are separated by a second distance. 6 . , the second distance is greater than the first distance. 6 . The eye tracker of claim 5 , wherein the image capturing element is a third distance away from the second lens end, and the image capturing element is a third distance away from the second beam splitter end. 7 . Four distances, the fourth distance is greater than the third distance, and the third distance is greater than the first distance. 7 . The eye tracker of claim 5 , wherein the image capturing element is a third distance from the second lens end, and the image capturing element is a third distance away from the second beam splitter end. 8 . Four distances, the fourth distance is greater than the third distance, and the third distance is less than the first distance. 8 . The eye tracker according to claim 2 , wherein the structured light source and the imaging element are disposed on one side of the second lens end, and the structured light source is located at the second lens end. 9 . and the imaging element. 9 . The eye tracker according to claim 2 , wherein the structured light source and the imaging element are disposed on one side of the second lens end, and the imaging element is located at the second lens. 10 . between the end and the structured light source. 10. A display device, comprising: Eye trackers, including: lens; a beam splitter, arranged on one side of the lens; a structured light source, disposed between the lens and the beam splitter; and An image capturing element is arranged between the lens and the spectroscope, wherein the structured light source is used to emit a first light beam to the spectroscope, and the first light beam is reflected from the spectroscope to the spectroscope a lens and pass through the lens to be directed to the eyeball, the first light ray is reflected from the eyeball to form a second light ray, wherein the second light ray passes through the lens and is directed to the beam splitter, and is emitted from the eyeball the beam splitter is reflected toward the image pickup element; and The display panel is disposed on one side of the beam splitter, and the beam splitter is located between the lens and the display panel.

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