Silicon-based OLED display structure with eye movement tracking function

Abstract

The utility model discloses a silicon-based OLED (Organic Light Emitting Diode) display structure with an eye movement tracking function, which comprises a silicon substrate, pixel units, light source pixels and light sensors are arranged on the silicon substrate, the light source pixels and the light sensors are correspondingly and adjacently arranged to form sensor assemblies, and a group of sensor assemblies are annularly arranged on the silicon substrate. A light source and a light sensor are integrated in the screen, which is beneficial to light and thin design of products; the sensors in the screen are circularly arranged according to the pupil shape, the screen can directly detect the reflected light intensity of the eyeball pupil center so as to calculate the eyeball movement position, and compared with frame light source oblique incidence, the pupil center calculation algorithm is simpler and more accurate; and through the PDL design of the light blocking isolation columns, the crosstalk of other light source pixels on the light sensor can be reduced, and the recognition accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to eye movement tracking display technical field especially is related to a silicon -based OLED display structure with eye movement tracking function. BACKGROUND

[0002] Eye tracking is widely used in near-eye display products, and can realize eyeball recognition interaction. By watching the corresponding position with the eyes, the system can immediately feel the gaze of the eyes, and can realize interaction with the screen, such as clicking, page turning and other functions. The mainstream eye tracking technology of VR glasses at present is to capture and track the motion trajectory of the glasses by capturing and tracking the infrared light projected by multiple infrared LED lights through the built-in eye movement tracking camera. For example, at least 4 infrared cameras are needed for tracking and recognition in Apple Vision Pro; For example, a method for tracking eye position and a detection device disclosed in patent CN105929963A, the light source and the sensor are arranged on the frame. A larger frame is reserved for VR glasses, which limits the screen size to some extent and reduces the display effect, and the heat generated by the LED light source further increases the thickness of the VR product with a fan for cooling.

[0003] From the perspective of consumers, VR products need to be thin and light to meet the more comfortable wearing experience, so further reducing the components outside the screen is one of the development trends of VR glasses; Therefore, in order to improve the above problems, the eye movement tracking method is adjusted and optimized, and the existing scheme of integrating the light source and the sensor on the display screen appears; For example, a display panel, an electronic device and a human eye tracking method disclosed in patent CN109256042A, the main technical scheme is: the display panel comprises: a substrate, a plurality of infrared light emitting components and a plurality of photoelectric sensors, the substrate is provided with a plurality of pixel units arranged in a matrix; A plurality of said infrared light emitting components are uniformly distributed on the substrate; A plurality of photoelectric sensors, a plurality of said photoelectric sensors are uniformly distributed on the substrate; The pixel unit, the light source and the sensor are arranged in a matrix, and the display effect and the recognition accuracy need to be improved. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a silicon-based OLED display structure with eye movement tracking function, which is beneficial to the thin and light design of the product and has high eye movement tracking precision.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme that:

[0006] The silicon-based OLED display structure with eye movement tracking function comprises a silicon substrate, pixel units, light source pixels and light sensors are arranged on the silicon substrate, the light source pixels and the light sensors are correspondingly arranged to form a sensor assembly, and a group of sensor assemblies are arranged in a circular ring on the silicon substrate.

[0007] Further or preferably,

[0008] The pixel unit is a hexagonal pixel structure.

[0009] The silicon substrate is provided with a sensor assembly at the center of the circular ring.

[0010] The light source pixel is integrated in the pixel unit.

[0011] The light source pixel of each sensor assembly is two, and the light sensor is one.

[0012] The light source pixel and the light sensor in the sensor assembly are hexagonal, and the adjacent light source pixel and the light sensor are arranged correspondingly.

[0013] The periphery of the light sensor is provided with a light-proof or light-absorbing material structure.

[0014] The light sensor is an organic photodetector.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The silicon-based OLED display structure with eye movement tracking function has reasonable design, adopts screen-integrated light source and light sensor, is beneficial to product thin design, the screen can directly detect the reflection light intensity of the eyeball pupil center, so as to calculate the eyeball moving position, compared with the oblique incidence of the frame light source, the calculation of the pupil center algorithm is more simple and accurate, and through the design of the light-blocking isolation column PDL, the crosstalk of other light source pixels to the light sensor can be reduced, and the recognition accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The content expressed by each figure of the present specification and the marks in the figure are briefly described as follows:

[0018] Figure 1 It is a hexagonal pixel structure schematic diagram of the utility model.

[0019] Figure 2 It is a light source and built-in sensor arrangement schematic diagram.

[0020] Figure 3 It is an eye light reflection schematic diagram.

[0021] Figure 4 It is a sensor anti-crosstalk schematic diagram. DETAILED DESCRIPTION

[0022] The specific embodiments of the utility model are further explained in detail by comparing the figures and describing the embodiments.

[0023] AsFigures 1 to 4 As shown, the silicon-based OLED display structure with eye-tracking function includes a silicon substrate, on which pixel units, light source pixels, and light sensors are integrated; the light source pixels and light sensors are arranged adjacent to each other to form a sensor assembly, and a group of sensor assemblies are arranged in a ring on the silicon substrate.

[0024] This invention employs an in-screen integrated light source and light sensor, which facilitates the design of a thin and light product. The in-screen sensors are arranged in a circle according to the shape of the pupil, and the screen can directly detect the intensity of reflected light at the center of the pupil, thereby calculating the position of eye movement. Compared with the oblique incidence of light from the edge light source, the algorithm for calculating the pupil center is simpler and more accurate.

[0025] like Figure 1 As shown, the pixel unit is a hexagonal pixel structure; the use of hexagonal pixel structure design maximizes the PPI (pixel density) of silicon-based OLED display screens.

[0026] Furthermore, a sensor assembly is disposed at the center of the annulus on the silicon substrate. Light source pixels are integrated within pixel units; each sensor assembly has two light source pixels and one light sensor, which is an organic photodetector (OPD).

[0027] Preferred options include: Figure 2 As shown, to achieve eye tracking, the OPD sensor design needs to be circularly arranged. Within the ring where the sensor needs to be added, a single sub-pixel (RGB group) is sacrificed, and two pixels are replaced with light source pixels. Figure 2 The green pixel can be either green light or infrared light. The green light pixel will be constantly lit during eye tracking while displaying the image on the screen, which will slightly affect the display. Therefore, infrared light can be used to emit light without affecting the display. The two sets of light source pixels are paired with a single OPD sensor to ensure sufficient emitted light intensity and improve detection efficiency. The position of the strongest reflection intensity (the center position of the pupil) can be calculated by detecting the reflected light intensity at the center position and on the ring.

[0028] like Figure 3 As shown, light at the center of the pupil is totally reflected by the retina, resulting in the strongest reflected light. Obliquely incident light is diffusely reflected by the retina. Therefore, the center of the pupil can be identified by detecting the position of the strongest light intensity.

[0029] The light source pixels and light sensor in the sensor assembly are both hexagonal, and adjacent light source pixels and light sensor edges are arranged correspondingly, resulting in a compact display effect.

[0030] The periphery of the light sensor is surrounded by a structure made of opaque or light-absorbing material. For example... Figure 4As shown, in order to improve the identification accuracy of the detector, avoid the crosstalk of the annular adjacent detector light source to the OPD, a PDL or other light-absorbing material PDL of BM (black glue) needs to be prepared on the periphery of the OPD detector, so as to ensure that a group of light sources corresponds to a detector, so that the light intensity emitted by the light source and the reflected light intensity received are more easily calculated accurately.

[0031] The OLED is prepared by vacuum evaporation, the silicon-based OLED adopts a WOLED+CF (filter) structure, after the evaporation of the OLED film layer is completed, the silicon nitride is prepared by PECVD / PEALD to temporarily encapsulate the OLED, then the OPD pixel is etched by mask, the annular structure is prepared, the infrared light source and the OPD are evaporated, the etching is performed on the residual above the non-detection pixel area after the evaporation is completed, the cathode is evaporated together after the etching is completed, and then the common encapsulation is performed; or the cathode is evaporated in the display area, then the cathode is evaporated in the detection area, then the temporary encapsulation layer is etched, and then the common auxiliary cathode (IZO, etc.) is prepared above.

[0032] The utility model discloses an in-screen integrated OPD, which can be evaporated in the same way as OLED, and the preparation process is matched with the existing production line, so that the cost is reduced, the camera can be cancelled, and the VR product module is light and thin; the pupil-shaped sensing pixel arrangement is used to realize the identification of the center point position of the human eye, and the calculation of the pupil center algorithm is simpler and more accurate compared with the oblique incidence of the frame light source; and the light blocking isolation column PDL design can reduce the crosstalk of other light source pixels to the light sensor and improve the identification accuracy.

[0033] The above is only the description of the preferred embodiment of the utility model, and the above technical features can be combined to form multiple embodiment schemes of the utility model.

[0034] The utility model has been described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited to the above mode, as long as various non-essential improvements are made by using the concept and technical scheme of the utility model, or the concept and technical scheme of the utility model is directly applied to other occasions without improvement, which is within the protection scope of the utility model.

Claims

1. A silicon-based OLED display structure with eye-tracking function, comprising a silicon substrate, wherein pixel units, light source pixels, and a light sensor are disposed on the silicon substrate, characterized in that: The light source pixels and the light sensor are arranged adjacently to form a sensor assembly, and a group of sensor assemblies are arranged in a circular pattern on the silicon substrate.

2. The silicon-based OLED display structure with eye-tracking function as described in claim 1, characterized in that: The pixel unit is a hexagonal pixel structure.

3. The silicon-based OLED display structure with eye-tracking function as described in claim 1, characterized in that: The sensor assembly is located at the center of the annulus on the silicon substrate.

4. The silicon-based OLED display structure with eye-tracking function as described in claim 1, characterized in that: The light source pixels are integrated into the pixel unit.

5. The silicon-based OLED display structure with eye-tracking function as described in claim 1, characterized in that: Each of the sensor components has two light source pixels and one light sensor.

6. The silicon-based OLED display structure with eye-tracking function as described in claim 2, characterized in that: The light source pixels and light sensors in the sensor assembly are both hexagonal, with adjacent light source pixels and light sensors having corresponding edges.

7. The silicon-based OLED display structure with eye-tracking function as described in claim 6, characterized in that: The optical sensor is surrounded by a structure made of opaque or light-absorbing material.

8. The silicon-based OLED display structure with eye-tracking function as described in any one of claims 1 to 7, characterized in that: The optical sensor is an organic photodetector.

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