CN114647083A

CN114647083A - Display module, head-mounted display equipment, and method and device for controlling emission spectrum

Info

Publication number: CN114647083A
Application number: CN202011492774.2A
Authority: CN
Inventors: 何庭波; 李江; 张朋; 李瑞华; 刘迎春; 李宣; 郭帮辉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2022-06-21
Anticipated expiration: 2040-12-17
Also published as: CN114647083B

Abstract

A display module, a head-mounted display device, and a method and a device for controlling emission spectrum are used for solving the problem that an augmented reality AR device or a virtual reality VR device in the prior art cannot prevent or correct myopia. The display module can be applied to head-mounted display equipment such as AR equipment or VR equipment. The display module may include: the display assembly comprises N light sources, each light source comprises N sub-light sources, the center wavelengths of the spectrums emitted by the N sub-light sources are different, and N is an integer larger than 3; the control component is used for controlling the n sub-light sources to respectively emit spectra according to the corresponding light-emitting weights; the display component is used for displaying images formed by fitting spectrums of the spectrums emitted by the n sub-light sources according to the corresponding light-emitting weights respectively, and the fitting degree of the fitting spectrums and the standard solar spectrum is larger than a threshold value. Through controlling the light emitting weight of the n sub-light sources, the fitting spectrum can be close to the standard solar spectrum with the myopia inhibiting effect, and therefore the display module can prevent or correct myopia.

Description

Display module, head-mounted display equipment, and method and device for controlling emission spectrum

Technical Field

The application relates to the technical field of display, in particular to a display module, a head-mounted display device, and a method and a device for controlling emission spectrum.

Background

Myopia has become an important problem affecting people's health, and the population of myopia is enormous. Myopia refers to the phenomenon that parallel rays pass through an eye dioptric system and are focused in front of the retina in the state that the crystalline lens is relaxed to adjust. Myopia can be divided into pseudomyopia and true myopia, pseudomyopia is the loss of the lens adjusting ability caused by ciliary muscle spasm and the like, and ciliary muscle can be relaxed through medicine or training and the like for treatment. The true nature is closely regarded as the defect of vitreous body caused by axial excessive development of vitreous body in the process of eyeball development, and is difficult to treat. Therefore, prevention of myopia progression is of particular importance.

If can come the myopia prevention through daily wear-type display device commonly used, can promote user experience. Currently, a commonly used head-mounted display device is, for example, an Augmented Reality (AR) device or a Virtual Reality (VR) device. Both the AR equipment and the VR equipment can realize the mutual combination of virtual information and the real world, namely, entity information (such as visual information, sound, touch and the like) which is difficult to experience in the time space range of the real world can be overlaid to the real world after simulation through a computer and the like, so that a user feels like the experience of the user. Therefore, AR devices and VR devices are widely used.

In summary, how to implement the function of both preventing and correcting myopia of the AR device or the VR device is a technical problem that needs to be solved at present.

Disclosure of Invention

The application provides a display module, a head-mounted display device, a method and a device for controlling emission spectrum, which are used for realizing that AR equipment or VR equipment has the functions of preventing and correcting myopia.

In a first aspect, the present application provides a display module that can be applied to a head-mounted display device. Wherein, the display module assembly can include display module assembly and control assembly. The display assembly may include N light sources, each of the N light sources including N sub-light sources, the N sub-light sources emitting spectra having different center wavelengths, N being an integer greater than 3, N being a positive integer. The control component is used for controlling each sub-light source emission spectrum in the n sub-light sources according to the acquired control signal, the control signal comprises a light-emitting weight of each sub-light source in the n sub-light sources, and the light-emitting weight is used for indicating the light-emitting duty ratio or the current size ratio of the corresponding sub-light source; the display component is used for displaying images formed by fitting spectrums of the spectrums emitted by the n sub-light sources according to the corresponding light-emitting weights respectively, and the fitting degree of the fitting spectrums and the standard solar spectrum is larger than a threshold value.

Based on the scheme, the light emitting weight of the n sub-light sources included in each light source in the display assembly is controlled, so that the fitting spectrum of the spectrum emitted by the n sub-light sources is close to the standard solar spectrum, and the ultraviolet component (350 nm-400 nm) in the standard solar spectrum has a strong inhibition effect on myopia. Thus, fitting the spectra of the n sub-light sources to the standard solar spectrum helps to prevent myopia.

In one possible implementation, the degree of fit of the fitted spectrum to the standard solar spectrum is used to represent the closeness of the fitted spectrum to the standard solar spectrum. Illustratively, the closer the fitted spectrum is to the standard solar spectrum, the greater the degree of fit.

Further, optionally, the fitness can be identified by the mean square error of the fit spectrum and the standard solar spectrum, the smaller the mean square error, the greater the fitness. The mean square error of the fitted spectrum and the standard solar spectrum can be determined by a difference algorithm.

In a possible implementation manner, the display module may further include a processor, where the processor may be configured to obtain a central wavelength and a full width at half maximum of a spectrum emitted by each of the n sub-light sources, and determine a light emission weight of each of the n sub-light sources according to a function of the central wavelength of the spectrum emitted by each of the n sub-light sources, the full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum; and generating a control signal according to the lighting weight of each of the n sub-light sources, wherein the function of the standard solar spectrum is a function of the center wavelength, the full width at half maximum and the lighting weight.

The processor included by the display module can determine the light-emitting weight of each of the n sub-light sources, so that the n sub-light sources can emit spectra according to the corresponding light-emitting weights.

In one possible implementation manner, the processor may be further configured to obtain a wavelength range of the standard solar spectrum, divide the wavelength range of the standard solar spectrum into n bands, and determine a wavelength at a center of each of the n bands as a center wavelength of the n sub-light sources, where the n bands correspond to the n sub-light sources one to one.

Through the method, the implementation mode of determining the central wavelength of the spectrum emitted by the sub-light sources is provided, and the corresponding sub-light sources can be prepared based on the determined central wavelength, so that the spectrum energy emitted by the n sub-light sources can be closer to the standard solar spectrum.

In a possible implementation manner, the control component is further configured to receive a control signal sent by the terminal device.

In one possible implementation, when n is greater than or equal to 9, the mean square error of the fit spectrum and the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit. When n is equal to 9, the fitted spectrum can better approach the standard solar spectrum, and the number of sub-light sources is small. Therefore, the display module is not only beneficial to miniaturization of the display module, but also can realize the function of preventing or correcting myopia of the display module.

In one possible implementation, n sub-light sources are arranged in h rows × k columns, n is equal to h multiplied by k, and h and k are positive integers.

By arranging the n sub-light sources in h rows × k columns, the number of the sub-light sources which can be accommodated in the same area can be increased as much as possible, thereby being beneficial to improving the maximum resolution of the display module.

In one possible implementation, the interval between any two adjacent sub-light sources of the n sub-light sources is not greater than 6.8 micrometers. In this way, a higher resolution can be achieved on a fixed size screen.

In one possible implementation, the display element is an Organic Light Emitting Diode (OLED) or a micro-LED.

Through these two display module spares, can be so that the display module assembly both can realize the function of prevention myopia, have higher resolution ratio again. Particularly, the display module is used for miniaturized AR equipment or VR equipment, and can realize higher resolution on a smaller-sized screen.

In a second aspect, the present application provides a head-mounted display device, which may include a fixing component and a display module in the first aspect or any possible implementation manner of the first aspect, where the fixing component is used to fix the display module. The beneficial effects can be seen from the description of the first aspect, and are not described in detail herein.

In a third aspect, the present application provides a method of controlling an emission spectrum, the method being applicable to a terminal device. The method comprises the steps of obtaining the center wavelength and the full width at half maximum of the spectrum emitted by each of N sub-light sources included in each of N light sources included in a display module; determining the light emitting weight of each sub-light source in the n sub-light sources according to the central wavelength of the spectrum emitted by each sub-light source in the n sub-light sources, the full width at half maximum of the spectrum emitted by each sub-light source in the n sub-light sources and a function of a standard solar spectrum; generating a control signal according to the light emitting weight of each sub-light source in the n sub-light sources, and sending the control signal to the display module; the control signal is used for controlling each of the n sub-light sources to emit a spectrum according to a corresponding light emitting weight, the light emitting weight is used for indicating the light emitting duty ratio or the current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is a function of the central wavelength, the full width at half maximum and the light emitting weight.

Based on the scheme, the light-emitting weight of the n sub-light sources included by each light source in the display module is determined, and each sub-light source in the display module is controlled to emit the spectrum according to the corresponding light-emitting weight, so that the fitting spectrum of the spectrum emitted by the n sub-light sources is close to the standard solar spectrum, and the ultraviolet component (350 nm-400 nm) in the standard solar spectrum has a strong inhibiting effect on myopia. Thus, fitting the spectra of the n sub-light sources to the standard solar spectrum helps to prevent myopia.

In a possible implementation manner, a wavelength range of the standard solar spectrum may be obtained first, the wavelength range of the standard solar spectrum is divided into n bands, and a wavelength at a center of each of the n bands is determined as a center wavelength of the n sub-light sources, where the n bands correspond to the n sub-light sources one to one.

In a possible implementation manner, the light-emitting weight is used to indicate a light-emitting duty ratio of the corresponding sub light source, and a period of time for passing current to each of the n sub light sources may be controlled according to the light-emitting weight of each of the n sub light sources.

In another possible implementation manner, the light-emitting weight is used to indicate a ratio of current magnitudes of the corresponding sub-light sources, and the magnitude of the current introduced to each of the n sub-light sources may be controlled according to the light-emitting weight of each of the n sub-light sources.

In a fourth aspect, the present application provides a method of controlling an emission spectrum, the method being applicable to a head-mounted display device comprising a display assembly comprising N light sources, each of the N light sources comprising N sub-light sources, the N sub-light sources emitting spectra with different center wavelengths, N being an integer greater than 3, N being a positive integer. The method can include the steps of obtaining the center wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources, and determining the light emitting weight of each of the n sub-light sources according to the functions of the center wavelength of the spectrum emitted by each of the n sub-light sources, the full width at half maximum of the spectrum emitted by each of the n sub-light sources and the standard solar spectrum; controlling the n sub-light sources to emit spectra respectively according to the corresponding light-emitting weights, and displaying fitting spectra of the spectra emitted by the n sub-light sources respectively, wherein the fitting degree of the fitting spectra and a standard solar spectrum is greater than a threshold value; wherein the light emitting weight is used for indicating the light emitting duty ratio or the current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is a function of the central wavelength, the full width at half maximum and the light emitting weight.

In one possible implementation, a range of wavelengths of the standard solar spectrum may be obtained; the wavelength range of the standard solar spectrum is divided into n wave bands, the wavelength at the center of each wave band in the n wave bands is respectively determined as the center wavelength of n sub light sources, and the n wave bands correspond to the n sub light sources one to one.

In one possible implementation, the light-emitting weight is used to indicate a light-emitting duty cycle of the corresponding sub-light source; the time period for passing the current to each of the n sub-light sources may be controlled according to the light emitting weight of each of the n sub-light sources.

In another possible implementation manner, the light emitting weight is used for indicating the current magnitude ratio of the corresponding sub-light source; and controlling the current passing through each of the n sub-light sources according to the light emitting weight of each of the n sub-light sources.

In one possible implementation, when n is greater than or equal to 9, the mean square error of the fit spectrum and the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.

In one possible implementation, the interval between any two adjacent sub-light sources of the n sub-light sources is not greater than 6.8 micrometers.

In one possible implementation, the display assembly is an OLED or a micro-LED.

In a fifth aspect, the present application provides an apparatus for controlling emission spectrum, which is used for implementing the method of any one of the above third aspect or third aspect, and includes corresponding functional modules, which are respectively used for implementing the steps in the above method. The functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible implementation, the means for controlling the emission spectrum may be a terminal device, and the means for controlling the emission spectrum includes a processing module and a transceiver module. The processing module is used for acquiring the center wavelength and full width at half maximum of the spectrum emitted by each of the N sub-light sources included in each of the N light sources included in the display module, determining the light emission weight of each of the N sub-light sources according to the center wavelength of the spectrum emitted by each of the N sub-light sources, the full width at half maximum of the spectrum emitted by each of the N sub-light sources, and generating a control signal according to the light emission weight of each of the N sub-light sources, wherein the control signal is used for controlling each of the N sub-light sources to emit the spectrum according to the corresponding light emission weight, the light emission weight is used for indicating the light emission duty ratio or the current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is related to the center wavelength, Full width at half maximum and light emission weight; the transceiver module is used for sending the control signal to the display module.

In a possible implementation, the processing module is further configured to obtain a wavelength range of the standard solar spectrum; dividing the wavelength range of the standard solar spectrum into n wave bands, and respectively determining the wavelength at the center of each wave band in the n wave bands as the center wavelength of the n sub-light sources, wherein the n wave bands correspond to the n sub-light sources one to one.

In one possible implementation, the light-emitting weight is used to indicate a light-emitting duty cycle of the corresponding sub-light source; the processing module is used for controlling the time interval of current passing through each of the n sub-light sources according to the light emitting weight of each of the n sub-light sources.

In a possible implementation manner, the light emitting weight is used for indicating the current magnitude ratio of the corresponding sub-light source; the processing module is used for controlling the current introduced into each of the n sub-light sources according to the light-emitting weight of each of the n sub-light sources.

In one possible implementation, when n is greater than or equal to 9, the mean square error of the fitted spectrum and the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.

For technical effects that can be achieved by any one of the second aspect to the fifth aspect, reference may be made to the description of the advantageous effects in the first aspect, and details are not repeated here.

Drawings

Fig. 1 is a schematic structural diagram of an AR glasses provided in the present application;

fig. 2 is a schematic structural diagram of a display module according to the present application;

FIG. 3 is a schematic structural diagram of a display module provided in the present application;

FIG. 4 is a schematic diagram illustrating a process of acquiring a control signal by a control component according to the present application;

FIG. 5 is a graph illustrating a relationship between a standard solar spectrum and a fitted spectrum of n sub-light source emission spectra provided herein;

FIG. 6a is a schematic diagram of a relationship between a light emission weight and a light emission duty ratio provided in the present application;

FIG. 6b is a diagram illustrating a relationship between a light emission weight and a current ratio;

FIG. 6c is a graph showing a relationship between a fitted spectrum and a standard solar spectrum provided herein;

FIG. 7 is a diagram illustrating the relationship between the number of sub-light sources, the full width at half maximum of the spectrum emitted by the sub-light sources, and the degree of fitting provided by the present application;

fig. 8 is a schematic structural diagram of another display module provided in the present application;

FIG. 9a is a schematic structural diagram of an imaging optical assembly provided herein;

FIG. 9b is a schematic imaging optical path diagram of an imaging optical assembly provided herein;

fig. 10 is a schematic structural diagram of another display module provided in the present application;

fig. 11a is a schematic structural diagram of another display module provided in the present application;

fig. 11b is a schematic structural diagram of another display module provided in the present application;

fig. 12 is a schematic structural diagram of a head-mounted display device provided in the present application;

FIG. 13 is a schematic flow chart of a method for controlling emission spectra according to the present application;

FIG. 14 is a schematic flow chart of another method for controlling emission spectra provided herein;

fig. 15 is a schematic structural diagram of a terminal device provided in the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Hereinafter, some terms in the present application will be explained. It should be noted that these explanations are for the convenience of those skilled in the art, and do not limit the scope of protection claimed in the present application.

Solar spectrum

The solar spectrum is an absorption spectrum of different wavelengths. The visible light and the invisible light can be divided. The wavelength of visible light is 400-760 (nanometer) nm, and the visible light is divided into 7 colors of red, orange, yellow, green, cyan, blue and purple after scattering, and the visible light is white light after being mixed. Invisible light is divided into two categories: the infrared ray is positioned outside the red light, the wavelength is more than 760nm, and the longest wavelength reaches 5300 nm; ultraviolet rays with a wavelength of 290-400 nm are located in the region outside the ultraviolet light.

The wavelength range of the standard solar spectrum is a portion of the wavelength range of the solar spectrum. The solar spectrum within the wave band range of 300-800 nm is generally called standard solar spectrum.

Luminous duty ratio of two, n sub-light sources

The light emitting duty ratio of the n sub-light sources may also be referred to as a pulse duty ratio, which is a ratio of a duration of applying current to each of the n light sources to the whole light emitting period (usually 1s), and refer to an example of fig. 6a described below.

Current ratio of three, n sub-light sources

The current ratio of the n sub-light sources refers to a ratio of each of the n sub-light sources to the total current supplied, and specifically, refer to the following example of fig. 6 b.

Full width at half maximum (FWHM)

Full width at half maximum, also referred to as half width at half maximum or half peak width or half wave width, refers to the full width of the band at half the height of the spectrum at the peak, see the full width at half maximum of the spectrum shown below in fig. 5 for spectra with center wavelengths of 400nm and 450 nm.

Based on the above, the application scenarios of the display module provided by the present application are introduced below.

The application provides a display module assembly can be applied to head mounted display device, for example can be applied to VR glasses, VR helmet, AR glasses or AR helmet etc.. Fig. 1 is a schematic structural view of the AR glasses provided by the present application. The AR glasses may include a display module, temple bars, and a frame. The display module is used for displaying images, so that a user can see the fused images comprising the virtual images and the real images through the AR glasses. The temple is used to wear the AR glasses in front of the user's eyes. The mirror holder is used for fixing display module assembly and mirror leg. The temple and the frame may be of metal or plastic construction, for example, and the construction of the temple and the frame is not limited in this application. It should be noted that the image displayed by the display module may be an image projected onto the display module by a terminal device (e.g., a mobile phone, a tablet computer, etc.), or may be an image formed by the display module.

Introduced like the background art, current head mounted display device can't realize the function of prevention or correction myopia, if can realize the function of prevention or correction myopia through daily use head mounted display device, help broadening the application field that the head mounted shows, and can improve user's use and experience.

In view of this, the application provides a display module assembly, and this display module assembly can prevent near-sighted, and can be applied to wear-type display device. When the display module is applied to the head-mounted display equipment, the head-mounted display equipment can realize the function of preventing myopia.

The display module set provided by the present application is specifically described below with reference to fig. 2 to 12.

Based on the above, as shown in fig. 2, a schematic structural diagram of a display module provided in the present application is shown. The display module may include a display component 201 and a control component 202. The display assembly 201 comprises N light sources, each light source of the N light sources comprises N sub-light sources, the center wavelengths of the spectrums emitted by the N sub-light sources are different, N is an integer greater than 3, and N is a positive integer; the control component 202 is configured to control each of the n sub-light sources to emit a spectrum according to the obtained control signal, where the control signal includes a light-emitting weight of each of the n sub-light sources, and the light-emitting weight is used to indicate a light-emitting duty ratio or a current ratio of the corresponding sub-light source; it is also understood that the control component 202 is configured to control each of the n sub-light sources to emit light spectrum according to the corresponding light-emitting weight according to the acquired control signal. Accordingly, each of the N sub-light sources included in each of the N light sources in the display assembly may emit a spectrum according to a corresponding light emission weight; the display component is used for displaying images formed by fitting spectrums of spectrums emitted by N sub-light sources in each light source in the N light sources according to the corresponding light-emitting weight, and the fitting degree of the fitting spectrums and the standard solar spectrum is larger than a threshold value.

The n sub-light sources respectively obtain n spectra according to the spectra emitted by the corresponding light-emitting weights, the spectra obtained by mixing the n spectra are fitting spectra, and the fitting spectra carry image information. In addition, the fitting degree of the fitting spectrum and the standard solar spectrum is used for representing the approaching degree of the fitting spectrum and the standard solar spectrum, and the fitting degree is larger as the fitting spectrum approaches the standard solar spectrum.

Based on the scheme, the light emitting weight of the n sub-light sources included in each light source in the display assembly is controlled, so that the fitting spectrum of the spectrum emitted by the n sub-light sources is close to the standard solar spectrum, and the ultraviolet component (350 nm-400 nm) in the standard solar spectrum has a strong inhibition effect on myopia. Therefore, fitting the spectra of the spectra emitted by the n sub-light sources helps to prevent myopia. Moreover, since one light source comprises n sub-light sources, the center wavelengths of the spectrums emitted by the n sub-light sources are different, the light source can be called as a wide-spectrum light source, the wavelength range of the spectrum emitted by the wide-spectrum light source is the wavelength range of the fitting spectrum, and therefore the display module displays an image formed by the wide spectrum.

The various functional components and structures shown in fig. 2 are described separately below to give an exemplary specific implementation.

First, display module 201

In one possible implementation, the display assembly 201 may include N light sources, each of which is the smallest repeatable lighting unit in the display assembly. Further alternatively, the N light sources may be arranged in H rows × K columns, where N is equal to H multiplied by K, and H and K are positive integers. Each light source in the N light sources includes N sub-light sources, the arrangement of the N sub-light sources may be h rows × k columns, N is equal to h multiplied by k, and h and k are positive integers. By arranging the n sub-light sources in h rows × k columns, the number of the sub-light sources which can be accommodated in the same area can be increased as much as possible, thereby being beneficial to improving the maximum resolution of the display module.

It should be noted that the arrangement of the N sub-light sources in each of the N light sources is the same. For example, taking n sub-light sources as 4 sub-light sources as an example, if the arrangement of the 4 sub-light sources is 1234, the arrangement of the 4 sub-light sources in each light source is 1234.

Fig. 3 is a schematic structural diagram of a display module according to the present application. The display assembly 201 in this example is exemplified as comprising 2 light sources, each light source being exemplified as comprising 9 sub-light sources. The 9 sub-light sources are arranged in 3 rows x 3 columns, where the center wavelengths emitted by the 9 sub-light sources are different from each other, indicated by different fills in fig. 3.

Further, optionally, the interval between any two adjacent sub-light sources in the n sub-light sources is not greater than 6.8 micrometers. Therefore, the maximum resolution of the display module is further improved. Taking the display module shown in fig. 3 as an example, 25400/6.8/3 (1344) light sources can be set on a one-inch (2.54 cm to 25400um) screen at least, and since one light source corresponds to one pixel, the minimum resolution of the one-inch screen is about 1344 × 1344.

In one possible implementation, the display module 201 serves as an image source to provide display content for the display module, such as 3D content, interactive images, and the like. That is, the display module 201 may perform spatial intensity modulation on the incident light to generate a light pattern (light pattern), where the light pattern is light carrying virtual image information, that is, a fitting spectrum of the spectrum emitted by n sub-sources in each light source according to the corresponding light emitting weight carries the virtual image information.

Illustratively, the display component 201 may be a Liquid Crystal Display (LCD), or an Organic Light Emitting Diode (OLED), or a micro-light emitting diode (micro-LED), or an Active Matrix Organic Light Emitting Diode (AMOLED), or a Flexible Light Emitting Diode (FLED), or a quantum dot light emitting diode (QLED). The OLED has high luminous efficiency and high contrast; the mini-LED display screen has higher luminous brightness and can be applied to scenes needing stronger luminous brightness.

Illustratively, the display assembly 201 may also be a reflective display screen. Such as a Liquid Crystal On Silicon (LCOS) display screen, or a reflective display screen based on a digital micro-mirror device (DMD). The LCOS and DMD have high resolution or aperture ratio due to their reflective structures.

Second, the control component 202

In one possible implementation, the control component 202 is configured to obtain a control signal and control each of the n sub-light sources to emit a spectrum according to the corresponding light-emitting weight according to the control signal. It is also to be understood that the control signal may be used to indicate the light emission weight of each of the n sub-light sources. For example, the control signal may include a light emission weight for each of the n sub-light sources.

Possible implementations of the control component 202 for obtaining the control signal are shown in various cases exemplarily based on whether the display module comprises a processor or not. It should be noted that the display module includes a processor, which may be called an all-in-one machine; the display module does not include a processor, and can be called a split machine. It should be understood that the display module may also include a memory, or the display module may not include a memory. If the display module does not comprise a memory, the instruction or the data needing to be stored can be stored in a memory outside the display module, and the display module can read the instruction or the data by calling the memory outside the display module.

In case one, the display module includes a processor.

Based on this situation one, fig. 4 exemplarily shows a process diagram of the control component 202 acquiring the control signal. The process of the control component acquiring the control signal comprises the following steps.

In step 401, the processor obtains the center wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources.

In one possible implementation, the processor may obtain the actual spectral center wavelength emitted by each of the n sub-light sources. It should be understood that the center wavelength of the actual spectrum emitted by each sub-light source is related to the material of the sub-light source, which can be specifically referred to the description of fig. 10 and fig. 11a described below, and the description is not repeated here.

Note that the center wavelengths of the spectra emitted by the N sub-light sources need to be designed in advance. One implementation of designing the center wavelength of the spectrum emitted by the n sub-light sources is shown as an example below.

The wavelength range of the standard solar spectrum can be obtained firstly, the wavelength range of the obtained standard solar spectrum is divided into n wave bands, the wavelength at the center of each wave band in the n wave bands is determined as the center wavelength of the n sub-light sources, and the n wave bands correspond to the n sub-light sources one to one. It should be noted that the wavelength range of the standard solar spectrum may be uniformly divided into n bands, or may be non-uniformly divided into n bands, which is not limited in this application. In addition, the center of each band does not refer to the absolute center, allowing for some deviation.

For example, the standard solar spectrum is uniformly divided into 9 bands, where n is 9. Referring to fig. 5, the wavelength range of the standard solar spectrum is 300-800 nm, the wavelength range of the standard solar spectrum can be uniformly divided into 9 bands at intervals of 50nm between the centers of the bands, that is, the 9 central wavelengths are λ respectively₁＝350nm、λ₂＝400nm、λ₃＝450nm、λ₄＝500nm、λ₅＝550nm、λ₆＝600nm、λ₇＝650nm、λ₈＝700nm、λ ₉750 nm. That is, the center wavelength of the spectrum emitted by the 9 sub-light sources is λ₁～λ₉. It should be understood that the 9 center wavelengths may also be λ₁＝400nm、λ₂＝450nm、λ₃＝500nm、λ₄＝550nm、λ₅＝600nm、λ₆＝650nm、λ₇＝700nm、λ₈＝750nm、λ ₉800 nm. It should be understood that the 9 center wavelengths are designed ideal center wavelengths, and actually, due to engineering errors or the characteristics of the luminescent material, the center wavelengths of the actual spectra emitted by the 9 sub-light sources may have a certain shift.

In a possible implementation manner, the full widths at half maximum of the spectrums emitted by each sub-light source may be equal or may not be equal. Typically, the full width at half maximum of the spectrum emitted by the sub-sources is about 25 ± 5 mm. In fig. 5, the spectrum corresponding to each band is a gaussian function, and the full width at half maximum of each spectrum is equal (i.e., w₁＝w₂＝w₃＝w₄＝w₅＝w₆＝w₇＝w₈＝w₉30mm) are exemplified.

For the convenience of description of the scheme, the following description will be given by taking as an example that the center wavelength of the spectrum actually emitted by each sub-light source is the same as the designed center wavelength.

At step 402, the processor may determine a lighting weight for each of the n sub-light sources as a function of a center wavelength of the spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum.

Wherein the function of the standard solar spectrum is a function of the center wavelength, the full width at half maximum and the luminous weight. Illustratively, the function of the standard solar spectrum can be represented by the following equation 1.

λ_solar ＝ a₁f₁(λ₁,w₁)+ a₂f₂(λ₂,w₂)… +a_nf_n(λ_n,w_n) Equation 1

Wherein n is the number of sub-light sources, f_nAs a function of the spectrum of the nth sub-light source, a_nIs the luminous weight of the nth sub-light source, λ_nIs the center wavelength, w, of the spectrum emitted by the nth sub-light source_nThe full width at half maximum of the spectrum emitted by the nth sub-light source. Note that the light emission weight "a" is_nIndicating the light emitting duty cycle or current magnitude ratio of the nth sub-light source. In addition, when the sub-light sources are arranged in h rows × k columns, the order of the nth sub-light source may be determined by the direction of the rows, for example, the 1 st sub-light source may be the 1 st sub-light source in the 1 st row, the 2 nd sub-light source may be the 2 nd sub-light source in the 1 st row and the 2 nd column, and so on; alternatively, the direction may be determined by the column, for example, the 1 st sub-light source may be the sub-light source in the 1 st row and the 1 st column, the 2 nd sub-light source may be the sub-light source in the 2 nd row and the 1 st column, and so on; or may be determined from n sub-light sources in a light source at any time.

In a possible implementation manner, the central wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources obtained in step 401 may be substituted into the above formula 1, and a solution (for example, a least square method) may be performed to obtain the light emitting weight of each of the n sub-light sources. That is, a can be determined₁、a₂…a_n。

In conjunction with FIG. 5, the 9 center wavelengths (λ) can be measured₁～λ₉) And 9 full widths at half maximum (w)₁～w₉) Respectively substituting into the above formula 1, solving the equation to obtain 9 coefficients 0.19133, 0.41591, 0.89415. 0.88078, 0.9219, 0.83964, 0.92431, 0.64636 and 0.91778, respectively, and normalizing the 9 coefficients to obtain the light emission weights of the 9 sub-light sources, namely a₁＝0.028849、a₂＝0.062711、a₃＝0.13482、a₄＝0.132804、a₅＝0.139004、a₆＝0.126601、a₇＝0.139368、a₈0.097458 and a₉＝0.138383。

Taking the example that the light emitting weight is used for indicating the light emitting duty ratio, as shown in FIG. 6a, a₁0.028849 denotes the 1 st sub-light source emitting duty ratio 0.028849, a₂0.062711 denotes the 2 nd sub-light source emitting duty ratio 0.062711, a₃0.13482 denotes the light emitting duty ratio of the 3 rd sub-light source 0.13482, a₄0.132804 denotes the light emitting duty ratio of the 4 th sub-light source 0.132804, a₅0.139004 denotes the light emitting duty ratio of the 5 th sub-light source 0.139004, a₆0.126601 denotes the light emitting duty ratio of the 6 th sub-light source 0.126601, a₇0.139368 denotes the light emitting duty ratio of the 7 th sub-light source 0.139368, a₈0.097458 denotes the light emitting duty ratio of the 8 th sub-light source 0.097458, a₉0.138383 denotes that the light emitting duty ratio of the 9 th sub-light source is 0.138383. Taking the light emitting weight for indicating the current magnitude ratio as an example, as shown in fig. 6b, the current magnitude ratio of the 1 st sub-light source is 0.028849, the current magnitude ratio of the 2 nd sub-light source is 0.062711, the current magnitude ratio of the 3 rd sub-light source is 0.13482, the current magnitude ratio of the 4 th sub-light source is 0.132804, the current magnitude ratio of the 5 th sub-light source is 0.139004, the current magnitude ratio of the 6 th sub-light source is 0.126601, the current magnitude ratio of the 7 th sub-light source is 0.139368, the current magnitude ratio of the 8 th sub-light source is 0.097458, and the current magnitude ratio of the 9 th sub-light source is 0.138383.

In step 403, the processor may generate a control signal according to the light emitting weight of each of the n sub-light sources.

Illustratively, the control signal may include a light emission weight of each of the n sub-light sources.

The processor sends the control signal to the control component, step 404. Accordingly, the control component may receive the control signal from the processor.

In one possible implementation, the processor may be a Central Processing Unit (CPU), other general-purpose processor, an Application Processor (AP), a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an Field Programmable Gate Array (FPGA), other programmable logic devices (programmable logic devices), a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor. The different processing units may be separate devices or may be integrated into one or more processors.

In case two, the display module does not include a processor.

Based on this case two, the control component 202 can receive the control signal sent by the terminal device. For the process of generating the control signal by the terminal device, reference may be made to the following description of the terminal device, and details are not repeated here.

The control component 202 may control each of the n sub-light sources to emit a spectrum according to the corresponding light-emitting weight based on the control signal obtained in the first case or the second case.

If the light-emitting weight is used to indicate the light-emitting duty ratio of the corresponding sub-light source, the control component 202 may be configured to control the period of time for passing current to each of the n sub-light sources according to the light-emitting weight of each of the n sub-light sources. For example, which sub-light source the current is input to in which period may be realized by controlling the on and off of the switch corresponding to the sub-light source. It should be understood that the magnitude of the current passed to the n sub-light sources may be equal.

If the light-emitting weight is used to indicate the current magnitude ratio of the corresponding sub-light source, the control component 202 can be used to control the current magnitude applied to each of the n sub-light sources according to the light-emitting weight of each of the n sub-light sources in conjunction with fig. 6 b. For example, varying the current input to each of the sub-light sources may be accomplished by controlling the change in resistance.

Further, optionally, each of the n sub-light sources may be configured to emit a spectrum according to a corresponding light-emitting weight, so that n spectra may be obtained, where the spectral functions of the n spectra are a₁f₁(λ₁,w₁)、a₂f₂(λ₂,w₂)…a _n(λ_n,w_n) (ii) a Fitting the n spectra to obtain a fitted spectrum.

With reference to FIG. 6a, the light emission weights (a) of the 9 sub-light sources obtained above are used₁～a₉) The control component 202 can be configured to: controlling the 1 st sub-light source by the light emission weight a₁Emission spectrum, i.e. at (0.028849 XT)₀) Introducing current to the 1 st sub-light source in a time interval; controlling the 2 nd sub-light source by light emission weight a₂Emission spectrum, i.e. at (0.062711 XT)₀) Introducing current to the 2 nd sub-light source in time intervals; and the like, controlling the 9 th sub-light source according to the light-emitting weight a₉Emission spectrum, i.e. at (0.138383 XT)₀) Passing current to the 9 th sub-light source in a time interval, wherein T₀Representing one cycle. Alternatively, with reference to fig. 6b, the light emission weights (a) of the 9 sub-light sources are obtained based on the above₁～a₉) The control component 202 can be configured to: controlling the 1 st sub-light source according to the light-emitting weight a₁Emission spectrum, i.e. when the current to the 1 st sub-light source is (0.028849 × I)₀) (ii) a Controlling the lighting weight a of the 2 nd sub-light source₂Emission spectrum, i.e. current (0.062711 × I) to the 2 nd sub-light source₀) (ii) a And the like, controlling the 9 th sub-light source according to the light-emitting weight a₉Emission spectrum, i.e. the current to the 9 th sub-light source is (0.138383 × I)₀) Wherein, I₀Representing the total current. Further, the spectra emitted by the 9 sub-light sources, respectively, are obtained as a₁f₁(λ₁,w₁)、a₂f₂(λ₂,w₂)、a₃f₃(λ₃,w₃)、a₄f₄(λ₄,w₄)、a₅f₅(λ₅,w₅)、a₆f₆(λ₆,w₆)、a₇f₇(λ₇,w₇)、a₈f₈(λ₈,w₈) And a₉f₉(λ₉,w₉) The 9 spectra are fitted to obtain a fitted spectrum, see fig. 6 c. Further, optionally, the mean square error is used to identify the degree of fit, and the mean square error of the fitted spectrum in fig. 6c with the standard solar spectrum is less than 0.12. Therefore, the fitting spectrum is close to the standard solar spectrum, and the display module can prevent myopia.

In one possible implementation, the mean square error of the fitted spectrum and the standard solar spectrum may be determined by a difference algorithm.

The relationship between the number of sub-light sources, the full width at half maximum of the spectrum emitted by the sub-light sources, and the degree of fitting will be described in detail by the simulation results. The degree of fit is characterized in fig. 7 by the mean square error, the smaller the mean square error, the higher the degree of fit of the fitted spectrum to the solar spectrum, i.e. the closer the fitted spectrum is to the standard solar spectrum. It should be understood that when the number of sub light sources is fixed, the weight coefficient of each sub light source is a fixed value.

Referring to fig. 7, a relationship diagram of the number of sub-light sources, the full width at half maximum of the spectrum emitted by the sub-light sources, and the fitting degree is provided. As can be seen from fig. 7, the mean square error between the fitted spectrum of the spectra emitted by the 4 sub-light sources and the standard solar spectrum decreases with increasing full width at half maximum; the mean square error between the fitting spectrum of the spectrum emitted by the 7 sub-light sources and the standard solar spectrum is reduced along with the increase of the full width at half maximum, and when the full width at half maximum is more than 50nm, the mean square error is basically kept unchanged; the mean square error between the fitted spectrum of the spectrum emitted by the 9 sub-light sources and the standard solar spectrum decreases with increasing full width at half maximum, and remains substantially constant when the full width at half maximum is greater than 25 nm. Further, when the number of the sub-light sources is constant and the full width at half maximum is less than 40nm, the wider the full width at half maximum is, the smaller the mean square error is, and the higher the degree of fitting is. When the full width at half maximum is constant, the more the number of the sub-light sources is, the smaller the mean square error is, and the higher the fitting degree is.

It will be appreciated that typically the full width at half maximum of the spectrum emitted by the sub-sources is fixed, typically 25 ± 5 mm. That is, the degree to which the fitted spectrum approaches the standard solar spectrum depends mainly on the number of sub-light sources, but considering the miniaturization of the display module, the number of sub-light sources needs to be controlled within a certain range.

In one possible implementation, when the number n of the sub-light sources is equal to 9 and the full width at half maximum of the spectrum emitted by each of the n sub-light sources is not less than 20 mm, the mean square error of the fitted spectrum and the standard solar spectrum is less than 0.12. Therefore, the miniaturization of the display module is facilitated, and the fitting spectrum of the spectrum emitted by the n sub-light sources is close to the standard solar spectrum.

Based on the above, a specific implementation manner of the display module is provided below in combination with a specific hardware structure. So as to further understand the structure of the display module.

Fig. 8 is a schematic structural diagram of another display module according to the present application. The display module includes a display module 801 and a control module 802. Further, optionally, the display module may further include an optical imaging component 803. The display component 801 may refer to the description of the display 201, and the control component 802 may refer to the description of the control component 202, which are not repeated herein. Optical imaging component 803 may be used to project the fitted spectrum displayed by display component 801 onto the human eye for imaging.

In one possible implementation, the control component 802 may include a driver circuit. Further, alternatively, one sub light source may correspond to one driving circuit. That is, one driving circuit may be used to drive one sub-light source to emit a spectrum. The specific driving process can be seen from the related description of fig. 6a or fig. 6 b.

Two possible configurations of the optical imaging assembly 803 are illustrated, as follows.

In structure 1, the optical imaging component 803 is a lens.

In one possible implementation, the lens may be a single spherical lens or an aspheric lens, or may be a combination of multiple spherical or aspheric lenses. The imaging quality of the system can be improved and the aberration of the system can be reduced by combining a plurality of spherical or aspherical lenses. The spherical lens and the aspheric lens can be Fresnel lenses, and the Fresnel lenses can reduce the volume and the mass of the mold assembly.

Further, optionally, the material of the spherical lens or the aspheric lens may be glass or resin, the resin material may reduce the mass of the mold assembly, and the glass material has higher imaging quality.

In configuration 2, the optical imaging component 803 is a folded optical path optical component.

Fig. 9a is a schematic structural diagram of an optical imaging assembly provided in the present application. The optical imaging component sequentially comprises a polaroid, a first 1/4 wave plate, a half-mirror, a second 1/4 wave plate and a reflection polaroid along the direction of a main optical axis of the half-mirror. Based on the optical imaging assembly of fig. 9a, the optical path can be seen in fig. 9 b. The polarizer is used to filter the polarization state of the fitted spectrum from the display screen to the same polarization state (i.e., referred to as the first linear polarization), for example, to horizontally or vertically linearly polarized light, which may be absorptive or reflective. The first linearly polarized light may be, for example, P-polarized light or S-polarized light. The 1/4 wave plate is used for converting the first linear polarized light from the polarizer into the first circular polarized light and transmitting the first circular polarized light to the half mirror. The transflective lens is used for transmitting the first circularly polarized light from the first 1/4 wave plate to the second 1/4 wave plate; the second 1/4 wave plate is used for converting the received first circular polarized light into second linear polarized light, and the polarization direction of the second linear polarized light is the same as that of the first linear polarized light; the reflective polarizer is used for reflecting the second linearly polarized light from the second 1/4 wave plate to the second 1/4 wave plate; the second 1/4 wave plate is also used to convert the received second linear polarization into second circular polarization, the rotation direction of the second circular polarization is the same as the rotation direction of the first circular polarization, and fig. 9b illustrates the left-hand circular polarization; the transflective lens is also used for reflecting the second circular polarized light from the second 1/4 wave plate into third circular polarized light, and the rotating direction of the third circular polarized light is opposite to that of the second circular polarized light; the second 1/4 wave plate is also used for converting the third circular polarized light from the transflective lens into third line polarized light; the reflective polarizer also serves to transmit third-line polarized light to the human eye to form an image.

Further, optionally, one or more aberration compensating lenses may be further included in the folded optical path assembly. These aberration compensating lenses can be used for aberration compensation. These aberration compensating lenses may be located at any position of the folded optical path. For example, these aberration compensating lenses may be located between the half mirror and the reflective polarizer. Fig. 9a illustrates an example including an aberration compensating lens 1 and an aberration compensating lens 2, where the aberration compensating lens 1 is located between the polarizer and the display assembly 801, and the aberration compensating lens 2 is located between the reflective polarizer and the human eye. The aberration compensation lens can be a single spherical lens or an aspheric lens, or a combination of multiple spherical or aspheric lenses, wherein the combination of the multiple spherical or aspheric lenses can improve the imaging quality of the system and reduce the aberration of the system. The material of the aberration compensation lens may be optical resin, and the materials of the aberration compensation lens 1 and the aberration compensation lens 2 may be the same or different. It is understood that the aberration compensating lens is used to compensate for spherical aberration, coma, astigmatism, distortion and chromatic aberration during imaging of a spherical or aspherical lens.

Through the optical imaging component of above-mentioned structure 2, owing to can fold the light path, consequently, help shortening the formation of image light path to help reducing the volume of optical imaging component, and then help reducing the volume of the display module assembly including this optical imaging component.

It should be noted that the optical imaging assembly 803 includes, but is not limited to, the following two structures exemplarily shown, and any structure that can achieve the convergence of the fitted spectrum of the spectrum emitted by the display assembly 801 to the human eye imaging can be used.

Two possible specific structures of the display module are exemplarily shown below based on the structures of different display components.

In the first structure, the display module includes a display module that is an OLED.

Fig. 10 is a schematic structural diagram of another display module provided in the present application. This display module assembly from the top down includes in proper order: a display assembly 1001, a control assembly 1002, and a substrate 1003. The display module 1001 is an OLED, and the OLED includes an upper electrode 10011, a light emitting layer 10012, an Indium Tin Oxide (ITO) 10013, and a lower electrode 10014; the light emitting layer 10012 can be separated by a pixel frame (see fig. 8), and one region is a sub-light source; ITO10013 is a transparent conductive layer. The control element 1002 is a Thin Film Transistor (TFT); the TFTs are respectively connected to the lower electrode 10014 and the upper electrode 10011 of the OLED, and can be used to control each of the n sub-light sources to emit light spectrum according to the light-emitting weight according to the control signal, so as to implement sub-light source addressing.

The substrate 1003 is located on the bottom layer for supporting the entire OLED. The material of the substrate 1003 may be, for example, plastic, glass, or metal foil. A control module 1002, i.e., a driving circuit (i.e., TFT) corresponding to each sub-light source, is disposed on the substrate 1003. The light emitting layer 10012 can be a light emitting material deposited or coated on the TFT, one sub-light source is a light emitting material with one chemical structure, and n sub-light sources are light emitting materials with n chemical structures. Specifically, a light-emitting substance of one chemical structure may be injected into each region surrounded by a pixel frame on the TFT by means of drip irrigation or the like. It should be noted that luminescent materials with different chemical structures can excite different central wavelengths.

The light emitting principle of the OLED neutron light source is as follows: under the control of the control assembly 1002, electrons and holes injected from the upper electrode 10011 and the lower electrode 10014 to the light emitting layer 10012 are recombined to form excitons at a bound energy level, and the excitons are radiatively transited, so that the light emitting layer 10012 can emit spectra of different central wavelengths.

In one possible implementation, when the display module 201 is an OLED, the spacing between any two adjacent sub-light sources in the display module is about 6.3um, and the resolution of a one-inch display screen is about 1344 × 1344. Therefore, the display module comprising the OLED can realize higher resolution and prevent myopia.

And in the second structure, the display module comprises a display component which is a Micro-LED.

Fig. 11a is a schematic structural diagram of another display module provided in the present application. This display module assembly includes from last down in proper order: a display assembly 1101, a control assembly 1102, and a substrate 1103. The display module 1101 is a Micro-LED, and the Micro-LED includes an upper electrode 11011, quantum dots (or phosphors with different chemical structures) 11012 with different diameters, a Multiple Quantum Well (MQW) light emitting layer 11013, and a lower electrode 11014. The control component 1002 is a TFT; the TFTs are connected to the lower electrode 11014 and the upper electrode 11011 of the Micro-LED, respectively, and can be used to control each of the n sub-light sources to emit light spectrum according to the light weight according to the control signal. It should be understood that fig. 11a is an example of quantum dots including spectra emitting three different center wavelengths, such as red quantum dots, green quantum dots, blue quantum dots, etc., and quantum dots of one color correspond to one sub-light source.

Wherein the substrate 1103 is located at the bottom layer for supporting the whole Micro-LED. The material of the substrate 1103 may be gallium nitride single crystal. A control component 1102, i.e., a driving circuit (i.e., TFT) corresponding to each sub-light source, is disposed on the substrate 1103. The multiple quantum well light emitting layer 11013 may be n-type doped, such as InGaN Si/GaN Si superlattice quantum wells. Quantum dots 11012 (or phosphors of different chemical structures) which may be of different diameters are provided over the multiple quantum well light emitting layer 11013. Specifically, quantum dots 11012 of different diameters (or phosphors of different chemical structures) may be coated on the surface of the multiple quantum well light emitting layer 11013 so that the quantum dots 11012 of different diameters (or phosphors of different chemical structures) may emit spectra of different center wavelengths. The quantum dots 11012 may be perovskite quantum dots. The multiple quantum well luminous layer is doped in an n type, and the perovskite quantum dots are made of semiconductor materials, so that holes can be effectively injected through perovskite, the multiple quantum well luminous layer can emit light and excite the perovskite quantum dots on the multiple quantum well luminous layer to enable the multiple quantum well luminous layer to emit light spectrums with other central wavelengths. Moreover, the perovskite quantum dots have better temperature stability, and are beneficial to improving the stability of the displayed colors of the display module.

The light-emitting principle of the Micro-LED neutron light source is as follows: when the lower electrode 11014 applies a forward bias voltage, electrons and holes are recombined in the multiple quantum well light-emitting layer 11013 to form excitons at a bound energy level, the excitons emit light by radiation transition, and the multiple quantum well light-emitting layer 11013 emits light to excite quantum dots (or fluorescent powders with different chemical structures) with different diameters to emit spectra with different central wavelengths.

Further, optionally, in order to improve the light emitting efficiency of the Micro-LED and to achieve a narrower spectrum, the Micro-LED may further include a buffer layer 11015, a Strained Layer Superlattice (SLS) 11016, and ITO11017, as can be seen in fig. 11 b.

In one possible implementation, when the display module 201 is a Micro-LED, the distance between any two adjacent sub-light sources in the display module is about 2.5um, and 25400um/2.5 um/3-3386 light sources can be disposed on a one-inch (1 inch-2.54 cm-25400 um) display screen, and since one light source corresponds to one pixel, the resolution of the one-inch display screen is about 3386 × 3386. Therefore, the display module comprising the Micro-LED can realize high resolution and myopia prevention.

It should be noted that the Micro-LED may be a PN cross-section diode, and is made of a direct energy gap semiconductor material.

Based on the structure and the functional principle of the display module assembly that the aforesaid described, this application can also provide a wear-type display device, and this wear-type display device can include the display module assembly and the fixed subassembly in above-mentioned any embodiment, and fixed subassembly is used for fixed display module assembly. The head-mounted display device may be the AR glasses in fig. 1, or may also be VR glasses, or may also be a VR helmet, or may also be an AR helmet, or the like.

It will be appreciated that the head mounted display device may also include other devices, such as wireless communication means, sensors, and memory, etc.

Fig. 12 is a schematic structural diagram of a head-mounted display device according to the present application. The head-mounted display device may include a fixed component 1201, a memory 1202, a display module 1203, and the like. It should be understood that the hardware configuration shown in fig. 12 is only one example. Head mounted display devices to which the present application is applicable may have more or fewer components than the head mounted display device shown in fig. 12, may combine two or more components, or may have a different configuration of components. The various components shown in fig. 12 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.

The fixing assembly 1201 is used for fixing the display module 1203. For example, when the head-mounted display device is AR glasses or VR glasses, the fixing member 1201 may be a temple and a frame, and for example, when the head-mounted display device is an AR helmet or VR helmet, the fixing member 1201 may be a helmet shell. The fixing member 1201 may be made of a metal material, a plastic material, or the like, which is not limited in this application.

Memory 1202 may be used to store data created during use of the head mounted display device, and the like. Further, optionally, the memory 1202 may also be used to store one or more computer programs, the one or more computer programs comprising instructions. The processor may execute the above instructions stored in the memory 1202 to cause the head-mounted display device to perform the methods of controlling the emission spectrum provided in some embodiments of the present application, as well as other functional applications and data processing, etc. The memory 1202 may include a program storage area and a data storage area. Wherein, the storage program area can store an operating system; the storage area may also store one or more applications (e.g., games, meetings, videos), and the like. The storage data area may store data created during use of the head mounted display device, and the like.

Further, memory 1202 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, Universal Flash Storage (UFS), and the like.

The display module 1203 may refer to the related descriptions of any of the above embodiments, and the description thereof is not repeated here.

Based on the foregoing and similar concepts, the present application provides a method for controlling emission spectra, as described with reference to fig. 13. The method can be applied to the display module in any embodiment, or the head-mounted display device comprising the display module in any embodiment, or the terminal device comprising the display module in any embodiment. It can also be understood that the method for controlling the emission spectrum can be implemented based on the display module shown in any of the above embodiments, or the head-mounted display device including the display module in any of the above embodiments, or the terminal device including the display module in any of the above embodiments. As shown in fig. 13, the method of controlling the emission spectrum includes the steps of:

step 1301, the center wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources are obtained.

The detailed description of step 1301 can refer to step 401, and will not be repeated here.

Step 1302, determining a light emitting weight of each of the n sub-light sources according to a function of a center wavelength of a spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum.

Wherein the function of the standard solar spectrum is a function of the center wavelength, the full width at half maximum and the luminous weight; the light-emitting weight is used for indicating the light-emitting duty ratio or the current magnitude ratio of the corresponding sub-light source.

This step 1302 can be referred to the description of step 402, and will not be repeated here.

And step 1303, controlling the n sub-light sources to emit the spectrums according to the corresponding light-emitting weights respectively.

In a possible implementation manner, the light-emitting weight is used to indicate a light-emitting duty ratio of the corresponding sub light source, and a period of time for passing current to each of the n sub light sources may be controlled according to the light-emitting weight of each of the n sub light sources. For example, which sub-light source the current is input to in which period may be realized by controlling the on and off of the switch corresponding to the sub-light source. It should be understood that the magnitude of the current passed to the n sub-light sources may be equal.

In another possible implementation manner, the light-emitting weight is used to indicate a ratio of current magnitudes of the corresponding sub-light sources, and the current magnitude applied to each of the n sub-light sources may be controlled according to the light-emitting weight of each of the n sub-light sources. For example, varying the current input to each of the sub-light sources may be accomplished by controlling the change in resistance.

In step 1304, an image formed by fitting spectra to the spectra emitted by the n sub-light sources is displayed.

Here, the fit of the fitted spectrum to the standard solar spectrum is greater than a threshold. Illustratively, the fit of the fitted spectrum to the standard solar spectrum may be represented by mean square error. Further, optionally, the mean square error of the fitted spectrum and the standard solar spectrum may be determined by a difference algorithm.

Through the steps 1301 to 1304, the fitting spectrum of the spectrum emitted by the n sub-light sources is close to the standard solar spectrum by controlling the light emitting weight of the n sub-light sources, and the ultraviolet component (350nm to 400nm) in the standard solar spectrum has a strong inhibition effect on myopia. Therefore, fitting the spectra of the spectra emitted by the n sub-light sources helps to prevent myopia.

Based on the foregoing and similar considerations, the present application provides another method of controlling the emission spectrum, as described with reference to fig. 14. The method can be applied to terminal equipment. The terminal device can control the emission spectrum, wherein the display module can comprise the display component and the control component in any one of the embodiments. It should be understood that the display module may not include a processor. The method of controlling the emission spectrum comprises the steps of:

step 1401, obtaining the center wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources.

The step 1401 may refer to the related description of the step 1301, and the description thereof is not repeated here.

Step 1402, determining a light emitting weight of each of the n sub-light sources according to a function of a center wavelength of a spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum.

The step 1402 can refer to the description of the step 1302 above, and the description thereof is not repeated here.

Here, the light emission weight is used to indicate a light emission duty ratio or a current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is a function with respect to the center wavelength, the full width at half maximum, and the light emission weight.

In step 1403, a control signal is generated according to the light emission weight of each of the n sub-light sources.

The control signal is used for controlling each sub-light source in the n sub-light sources to emit the spectrum according to the corresponding light-emitting weight.

This step 1403 can be referred to the description of the step 1303, and will not be repeated here.

Step 1404, sending a control signal to the display module.

It is understood that, in order to implement the functions of the above method embodiments, the terminal device includes a corresponding hardware structure and/or software module for executing each function. Those of skill in the art will readily appreciate that the various illustrative modules and method steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed in hardware or computer software driven hardware depends on the specific application scenario and design constraints of the solution.

Fig. 15 is a schematic structural diagram of a possible terminal device provided in the present application. These terminal devices can be used to implement the functions of the method embodiment in fig. 14, and therefore, the beneficial effects of the method embodiment can be achieved.

As shown in fig. 15, the terminal apparatus 1500 includes a processing module 1501 and a transceiver module 1502. When the terminal device 1500 is used to implement the functionality in the method embodiment of fig. 14 described above: the processing module 1501 is configured to obtain a center wavelength and a full width at half maximum of a spectrum emitted by each of the n sub-light sources; determining a light emitting weight of each of the n sub-light sources according to a center wavelength of a spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a function of a standard solar spectrum, wherein the light emitting weight is used for indicating a light emitting duty ratio or a current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is a function of the center wavelength, the full width at half maximum, and the light emitting weight; generating a control signal according to the light emitting weight of each of the n sub-light sources, wherein the control signal is used for controlling each of the n sub-light sources to emit a spectrum according to the corresponding light emitting weight; the transceiver module 1502 is used for sending a control signal to the display module.

The more detailed description of the processing module 1501 and the transceiver module 1502 can be directly obtained by referring to the related description in the embodiment of the method shown in fig. 14, and is not repeated here.

It should be understood that the processing module 1501 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 1502 may be implemented by a transceiver or a transceiver-related circuit component.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by software instructions executed by a processor. The software instructions may consist of corresponding software modules that may be stored in Random Access Memory (RAM), flash memory, read-only memory (ROM), programmable ROM, Erasable PROM (EPROM), Electrically EPROM (EEPROM), registers, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may be located in a head-mounted display device or a terminal device. Of course, the processor and the storage medium may reside as discrete components in a terminal device or head mounted display device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, user equipment, or other programmable device. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

In the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In the description of the text of this application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship. In the formula of the present application, the character "/" indicates that the preceding and following associated objects are in a "division" relationship. Additionally, in the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Or it may be appreciated that the use of the word exemplary is intended to present concepts in a concrete fashion, and is not intended to limit the scope of the present application.

It is to be understood that the various numerical designations referred to in this application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic. The terms "first," "second," and the like, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such as a list of steps or elements. A method, system, article, or apparatus is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, system, article, or apparatus.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely illustrative of the concepts defined by the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. The utility model provides a display module assembly, its characterized in that is applied to head mounted display device, display module assembly includes: the display assembly comprises N light sources, each light source in the N light sources comprises N sub light sources, the center wavelengths of spectrums emitted by the N sub light sources are different, N is an integer larger than 3, and N is a positive integer;

the control component is used for controlling each sub-light source emission spectrum in the n sub-light sources according to the acquired control signal, the control signal comprises a light-emitting weight of each sub-light source in the n sub-light sources, and the light-emitting weight is used for indicating a light-emitting duty ratio or a current magnitude ratio of the corresponding sub-light source;

the display component is used for displaying images formed by fitting spectrums of the spectrums emitted by the n sub-light sources according to the corresponding light-emitting weights respectively, and the fitting degree of the fitting spectrums and the standard solar spectrum is larger than a threshold value.

2. The display module of claim 1, wherein the display module further comprises a processor configured to:

acquiring the center wavelength and the full width at half maximum of the spectrum emitted by each of the n sub-light sources;

determining a lighting weight for each of the n sub-light sources as a function of a center wavelength of the spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and the standard solar spectrum, the function of the standard solar spectrum being a function of the center wavelength, the full width at half maximum, and the lighting weight;

and generating the control signal according to the light-emitting weight of each sub-light source in the n sub-light sources.

3. The display module of claim 2, wherein the processor is further configured to:

acquiring the wavelength range of the standard solar spectrum;

dividing the wavelength range of the standard solar spectrum into n wave bands, and respectively determining the wavelength at the center of each wave band in the n wave bands as the center wavelength of the n sub-light sources, wherein the n wave bands correspond to the n sub-light sources one to one.

4. The display module of claim 1, wherein the control component is further configured to:

and receiving the control signal sent by the terminal equipment.

5. A display module according to any one of claims 1 to 4, wherein when n is greater than or equal to 9, the mean square error of the fitted spectrum with the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.

6. The display module according to any one of claims 1 to 5, wherein the n sub-light sources are arranged in a manner of: h rows by k columns, n is equal to h multiplied by k, and h and k are both positive integers.

7. The display module according to any one of claims 1 to 6, wherein the interval between any two adjacent sub-light sources of the n sub-light sources is not greater than 6.8 μm.

8. The display module according to any one of claims 1 to 7, wherein the display element is an Organic Light Emitting Diode (OLED) or a Micro light emitting diode (Micro LED).

9. A head-mounted display device, comprising the display module according to any one of claims 1 to 8, and a fixing member for fixing the display module.

10. A method for controlling emission spectrum, applied to a terminal device, the method comprising:

acquiring the central wavelength and the full width at half maximum of the spectrum emitted by each of the N sub-light sources included in each of the N light sources included in the display module;

determining a light emitting weight of each of the n sub-light sources according to a function of a center wavelength of a spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum, the light emitting weight being used for indicating a light emitting duty ratio or a current magnitude ratio of the corresponding sub-light source, the function of the standard solar spectrum being a function of the center wavelength, the full width at half maximum, and the light emitting weight;

generating a control signal according to the light emitting weight of each of the n sub-light sources, wherein the control signal is used for controlling each of the n sub-light sources to emit a spectrum according to the corresponding light emitting weight;

and sending the control signal to the display module.

11. The method of claim 10, wherein the method further comprises:

acquiring the wavelength range of the standard solar spectrum;

12. The method according to claim 10 or 11, wherein the lighting weight is used to indicate a lighting duty cycle of the corresponding sub-light source;

the controlling the n sub-light sources to emit spectra according to the corresponding light-emitting weights respectively comprises:

and controlling the time interval of current passing through each of the n sub-light sources according to the light emitting weight of each of the n sub-light sources.

13. The method according to claim 10 or 11, wherein the lighting weight is used to indicate a current magnitude ratio of the corresponding sub-light source;

and controlling the current passing through each of the n sub-light sources according to the light emitting weight of each of the n sub-light sources.

14. The method of any of claims 10 to 13, wherein when n is greater than or equal to 9, the mean square error of the fitted spectrum with the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.

15. A method for controlling emission spectrum is applied to a head-mounted display device, wherein the head-mounted display device comprises a display component, the display component comprises N light sources, each light source in the N light sources comprises N sub-light sources, the center wavelengths of the spectra emitted by the N sub-light sources are different, N is an integer greater than 3, and N is a positive integer;

and controlling the n sub-light sources to emit spectra respectively according to the corresponding light-emitting weights, and displaying fitting spectra of the spectra emitted by the n sub-light sources respectively, wherein the fitting degree of the fitting spectra and a standard solar spectrum is greater than a threshold value.

16. The method of claim 15, wherein said obtaining the center wavelength of the spectrum emitted by each of the n sub-light sources comprises:

acquiring the wavelength range of the standard solar spectrum;

17. The method according to claim 15 or 16, wherein the lighting weight is used to indicate a lighting duty cycle of the corresponding sub-light source;

18. The method according to claim 15 or 16, wherein the lighting weight is used to indicate a current magnitude ratio of the corresponding sub-light source;

19. The method of any of claims 15 to 18, wherein when n is greater than or equal to 9, the mean square error of the fitted spectrum and the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.

20. The method according to any of claims 15 to 19, wherein the n sub-light sources are arranged in a manner of: h rows by k columns, n equals h times k, and h and k are both positive integers.

21. A method according to any of claims 15 to 20, wherein the spacing between any adjacent two of the n sub-light sources is no more than 6.8 microns.

22. The method of any one of claims 15 to 21, wherein the display component is an Organic Light Emitting Diode (OLED) or a Micro LED.

23. An apparatus for controlling emission spectrum, comprising a processing module and a transceiver module;

the processing module is used for acquiring the central wavelength and the full width at half maximum of the spectrum emitted by each of the N sub-light sources included in each of the N light sources included in the display module, and determining a light emission weight of each of the n sub-light sources according to a function of a center wavelength of a spectrum emitted by each of the n sub-light sources, a full width at half maximum of the spectrum emitted by each of the n sub-light sources, and a standard solar spectrum, and generating a control signal according to the light emitting weight of each of the n sub-light sources, wherein the control signal is used for controlling each of the n sub-light sources to emit a spectrum according to the corresponding light emitting weight, the lighting weight is used for indicating the lighting duty ratio or the current magnitude ratio of the corresponding sub-light source, and the function of the standard solar spectrum is a function of the central wavelength, the full width at half maximum and the lighting weight;

and the transceiver module is used for sending the control signal to the display module.

24. The apparatus of claim 23, wherein the processing module is further configured to:

acquiring the wavelength range of the standard solar spectrum;

25. The apparatus of claim 23 or 24, wherein the lighting weight is used to indicate a lighting duty cycle of the corresponding sub-light source;

the processing module is configured to:

26. The apparatus according to claim 23 or 24, wherein the lighting weight is used to indicate a current magnitude ratio of the corresponding sub-light source;

the processing module is configured to:

27. The apparatus of any one of claims 23 to 26, wherein when n is greater than or equal to 9, the mean square error of the fitted spectrum with the standard solar spectrum is less than 0.2, the mean square error being used to identify the degree of fit.