Manual-automatic integrated airborne head-up display brightness adjusting method

Abstract

The invention belongs to the field of display brightness adjustment of an aviation airborne head-up display, and particularly relates to a manual-automatic integrated airborne head-up display brightness adjustment method, which comprises the following steps of: reading a real-time ambient light value through an ambient light sensor, acquiring a current gear value through a gear encoder, and adjusting the brightness of the airborne head-up display according to different ambient light values. Different brightness adjusting curves are constructed, and the brightness adjusting curves meet the requirement that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes; in the manual-automatic integrated mode, the manually adjustable brightness range is from the minimum brightness set by the head-up display to the maximum brightness, the maximum brightness adjusting space is provided for a pilot, and the pilot can more easily adjust the brightness of the head-up display to adapt to external ambient light through the gear encoder.

Description

Technical Field

[0001] The invention belongs to the field of display brightness adjustment of an aviation head-up display, and in particular relates to a manual-automatic brightness adjustment method for an aviation head-up display. Background Art

[0002] The airworthiness standard AS8055A for aircraft head-up displays has corresponding provisions for the brightness adjustment function of the head-up display. A good brightness adjustment design is not only a necessary condition for airworthiness certification, but also an inevitable requirement for in-depth understanding of user needs and improving product human-machine performance.

[0003] The brightness adjustment function is an indispensable function of the HUD. When an aircraft is flying in the air, it may be exposed to scenes where the external ambient light fluctuates, such as direct sunlight and flying through clouds. If the HUD cannot adjust its own brightness in time to adapt to the external ambient light, it may cause discomfort to the pilot and even cause the "HUD screen display function" to be lost. The display brightness of an excellent HUD needs to change with the ambient light and maintain a good display contrast so that the HUD symbols are clearly visible. At present, the brightness adjustment display contrast ratio used by the HUD will change with the ambient light, the brightness adjustment rate cannot be changed under different ambient lights, and the manually adjusted brightness range in the manual and automatic mode is small, which makes it difficult to meet the requirements of different pilots for the HUD display brightness. Summary of the invention

[0004] In view of this, in order to solve the above technical problems, the present invention provides a manual-automatic integrated airborne head-up display brightness adjustment method.

[0005] The technical solution of the present invention is:

[0006] A method for adjusting brightness of a manual-automatic airborne head-up display, the method comprising:

[0007] Read the real-time ambient light value through the ambient light sensor;

[0008] Get the current gear value through the gear encoder;

[0009] According to different ambient light values, different brightness adjustment curves are constructed, and the brightness adjustment curves satisfy that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes;

[0010] If the ambient light changes, the display brightness and adjustable range of the head-up display are automatically updated based on the adaptive brightness adjustment curve according to different ambient light values;

[0011] If the gear position is changed by rotating the gear encoder, the brightness of the head-up display is forcibly adjusted on the adapted brightness adjustment curve, and the brightness adjustment range is from the minimum brightness to the maximum brightness set for the head-up display;

[0012] If the automatic brightness adjustment function of the head-up display is deactivated, rotary brightness adjustment remains available.

[0013] Furthermore, the airborne head-up display collects the ambient light brightness value in real time through a communication interface with the ambient light sensor; and sets the ambient light brightness value actually used according to the ambient light brightness value range limited by the airborne head-up display.

[0014] Furthermore, after the onboard head-up display is powered on, a default brightness adjustment gear is set, which is increased or decreased by rotating the gear encoder.

[0015] Furthermore, under different ambient light conditions, the ratio of the brightness adjustment formula of the onboard head-up display setting to the ambient light remains unchanged when the gear encoder remains unchanged.

[0016] Furthermore, the brightness adjustment formula is used to calculate the display brightness value of the head-up display after substituting different ambient light values ​​and gear values.

[0017] Furthermore, under different ambient light conditions, the gear range of the brightness adjustment curve formula set for the airborne head-up display is different; the gear adjustable range decreases as the ambient light increases; when the gear remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases.

[0018] Furthermore, when the ambient light remains unchanged, the slope of the brightness adjustment curve increases as the gear position increases.

[0019] Furthermore, the minimum value of each brightness adjustment curve is the minimum brightness of the head-up display, and the maximum value of each brightness adjustment curve is the maximum brightness of the head-up display.

[0020] Furthermore, the head-up display is provided with a default brightness value when automatic brightness adjustment fails. If the automatic brightness adjustment of the head-up display fails, the brightness of the head-up display is adjusted on a brightness adjustment curve constructed based on the gear position at the default ambient light value.

[0021] Beneficial effects of the present invention:

[0022] The manual-automatic airborne head-up display brightness adjustment method proposed by the present invention can make the head-up display display brightness contrast ratio remain unchanged when only the ambient light changes, reduce the pilot's visual fatigue and blindness, and improve the safety of flight; and the brightness adjustment rate is different under different ambient lights. When the ambient light brightness is low, the pilot is more sensitive to the brightness adjustment change of the head-up display. At this time, the slope of the brightness adjustment curve is small, and the adjustable brightness range is large. When the ambient light brightness increases, the pilot needs to adjust the head-up display brightness to a suitable brightness faster according to the ambient light brightness. At this time, the slope of the brightness adjustment curve increases, and the adjustable brightness range decreases; at the same time, the manually adjustable brightness range in the manual-automatic mode is from the minimum brightness to the maximum brightness set for the head-up display, giving the pilot the maximum brightness adjustment space, so that the pilot can more easily adjust the head-up display brightness to adapt to the external ambient light through the gear encoder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the physical composition of the present invention;

[0025] Figure 2 A schematic diagram of a manual-automatic brightness adjustment curve of the present invention;

[0026] Figure 3 This is a flowchart of the manual-automatic brightness adjustment of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0028] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0029] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0030] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0031] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0032] In one embodiment of the present invention, a method for adjusting brightness of a manual-automatic airborne head-up display is provided, the method comprising:

[0033] Read the real-time ambient light value through the ambient light sensor;

[0034] Get the current gear value through the gear encoder;

[0035] According to different ambient light values, different brightness adjustment curves are constructed, and the brightness adjustment curves satisfy that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes;

[0036] If the ambient light changes, the display brightness and adjustable range of the head-up display are automatically updated based on the adaptive brightness adjustment curve according to different ambient light values;

[0037] If the gear position is changed by rotating the gear encoder, the brightness of the head-up display is forcibly adjusted on the adapted brightness adjustment curve, and the brightness adjustment range is from the minimum brightness to the maximum brightness set for the head-up display;

[0038] If the automatic brightness adjustment function of the head-up display is deactivated, rotary brightness adjustment remains available.

[0039] In this embodiment, the airborne head-up display collects the ambient light brightness value in real time through a communication interface with the ambient light sensor; and sets the ambient light brightness value actually used according to the ambient light brightness value range limited by the airborne head-up display.

[0040] In this embodiment, a default brightness adjustment gear is set after the airborne head-up display is powered on, and the brightness is increased or decreased by rotating the gear encoder.

[0041] In this embodiment, under different ambient light conditions, the ratio of the brightness adjustment formula set for the onboard head-up display to the ambient light remains unchanged when the gear encoder remains unchanged.

[0042] In this embodiment, the brightness adjustment formula is used to calculate the display brightness value of the head-up display after substituting different ambient light values ​​and gear values.

[0043] In this embodiment, under different ambient light conditions, the gear range of the brightness adjustment curve formula set for the airborne head-up display is different; the gear adjustable range decreases as the ambient light increases; when the gear remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases.

[0044] In this embodiment, when the ambient light remains unchanged, the slope of the brightness adjustment curve increases as the gear position increases.

[0045] In this embodiment, the minimum value of each brightness adjustment curve is the minimum brightness of the head-up display, and the maximum value of each brightness adjustment curve is the maximum brightness of the head-up display.

[0046] In this embodiment, the head-up display is provided with a default brightness value when automatic brightness adjustment fails. If the automatic brightness adjustment of the head-up display fails, the brightness of the head-up display is adjusted on a brightness adjustment curve constructed based on the gear position and the default ambient light value.

[0047] This embodiment is preset based on the following steps:

[0048] S1: Read the real-time ambient light value through the ambient light sensor;

[0049] S2: Get the current gear value through the gear encoder;

[0050] S3: constructing different brightness adjustment curves according to different ambient light values, where the brightness adjustment curves satisfy the requirement that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes;

[0051] Afterwards, if the ambient light changes, the range of adjustable brightness levels of the head-up display will be automatically updated according to different ambient light values;

[0052] If the gear position is changed by rotating the gear encoder, the brightness of the head-up display is adjusted on the brightness adjustment curve constructed by the ambient light value in S3, and the brightness adjustment range is from the minimum brightness to the maximum brightness set by the head-up display;

[0053] Under different ambient light conditions, if the gear position is changed by rotating the gear encoder, the adjustable display brightness range of the head-up display remains unchanged.

[0054] If the automatic brightness adjustment of the head-up display fails, manual brightness adjustment is still available.

[0055] In S1, the airborne head-up display collects the ambient light brightness value in real time through the communication interface with the ambient light sensor, and sets the ambient light brightness value actually used according to the ambient light brightness value range limited by the airborne head-up display.

[0056] In S2, the default brightness adjustment gear is set after the onboard head-up display is powered on, and the gear is increased or decreased by rotating the gear encoder.

[0057] In S3, the brightness adjustment curve satisfies that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes. Under different ambient light, the ratio of the brightness adjustment formula set by the onboard head-up display (the display brightness value of the head-up display is calculated by substituting different ambient light values ​​and gear values ​​into the brightness adjustment formula) to the ambient light remains unchanged when the gear encoder remains unchanged. The display brightness contrast ratio formula of the head-up display is as follows:

[0058]

[0059] CR is the display brightness contrast ratio of the head-up display; DB is the brightness value of the head-up display; CE is the external ambient light value.

[0060] Afterwards, if the ambient light changes, the range of adjustable brightness levels of the head-up display will be automatically updated according to the different ambient light values. Under different ambient light conditions, the range of the brightness adjustment curve formula set by the onboard head-up display is different. The adjustable range decreases as the ambient light increases. When the level remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases.

[0061] If the gear position is changed by rotating the gear encoder, the brightness of the head-up display is adjusted on the brightness adjustment curve constructed by the ambient light value in S3. When the ambient light remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases. The maximum and minimum values ​​of the brightness adjustment curve corresponding to different ambient lights are the minimum brightness to the maximum brightness set by the head-up display.

[0062] Under different ambient light conditions, if the gear position is changed by rotating the gear encoder, the adjustable display brightness range of the head-up display remains unchanged. Under different ambient light conditions, the range of the brightness adjustment curve set by the onboard head-up display is the same. When the brightness encoder is rotated, the brightness adjustment range is from the minimum brightness to the maximum brightness set by the head-up display.

[0063] The head-up display sets a default brightness value when automatic brightness adjustment fails. If the automatic brightness adjustment of the head-up display fails, the head-up display brightness is adjusted on a brightness adjustment curve constructed by the default ambient light value.

[0064] like Figure 1 As shown, the physical composition of this embodiment includes two ambient light sensors 1, 2, a gear encoder 3, a brightness processing module 4 arranged inside the head-up display, and an image source module 5 arranged inside the head-up display, wherein the brightness processing module stores the software of the manual-automatic brightness adjustment algorithm and controls the brightness set by the image source output brightness processing module.

[0065] like Figure 2 As shown, this embodiment provides a brightness adjustment curve for a manual-automatic airborne head-up display. The horizontal axis is the gear value, which increases gradually from left to right, the minimum gear value is 1, and the minimum change is 1; the vertical axis is the brightness value output by the head-up display, which increases gradually from bottom to top, and the adjustable range of the brightness value is [MINDB, MAXDB]; CE1, CE2, CE3, CE4, CE5 and CE6 are different ambient light brightness values, and the corresponding curves are corresponding brightness adjustment curves, where CE1>CE2>CE3>CE4>CE5>CE6, CE1 is the maximum ambient light brightness value limited by the head-up display, CE6 is the minimum ambient light brightness value limited by the head-up display, Figure 2 The number of brightness curves between CE1 and CE6 is for illustration only. Different actual ambient light brightness values ​​correspond to different brightness adjustment curves. CE5X is the maximum value of the adjustable gear corresponding to the ambient light brightness value CE5, and CE6X is the maximum value of the adjustable gear corresponding to the ambient light brightness value CE6. The adjustable gear ranges of CE1, CE2, CE3, CE4, CE5 to CE6 gradually increase. 2X is the default brightness adjustment gear value set after the head-up display is powered on.

[0066] like Figure 3 As shown, this embodiment provides a manual and automatic onboard head-up display brightness adjustment algorithm, combined with Figure 2 The specific processing methods include:

[0067] The real-time ambient light value is read through ambient light sensor 1. If the ambient light value cannot be obtained through ambient light sensor 1, the real-time ambient light value is read through ambient light sensor 2. The ambient light brightness value range limited by the airborne head-up display is [CE6, CE1]. If the ambient light brightness value read by the ambient light sensor is less than CE6, the airborne head-up display sets the ambient light brightness value to CE6; if the ambient light brightness value read by the ambient light sensor is greater than CE1, the airborne head-up display sets the ambient light brightness value to CE1; otherwise, the airborne head-up display takes the ambient light brightness value read by the ambient light sensor.

[0068] After the onboard head-up display is powered on, the default brightness adjustment level is set to 2X. By rotating the level encoder, the level can be increased or decreased, and the current level value can be updated in real time.

[0069] Construct different brightness adjustment curves according to different ambient light values. (Different ambient light values ​​such as CE1, CE2, CE3 correspond to different brightness adjustment curves.) All brightness adjustment curves satisfy the ratio of the brightness adjustment formula set by the onboard head-up display to the ambient light, which remains unchanged when the gear encoder remains unchanged, ensuring that the brightness adjustment curve satisfies the display brightness contrast ratio of the head-up display only when the ambient light changes. If the gear remains at the default brightness adjustment gear 2X unchanged, the dimming formula corresponding to the ambient light brightness value within all ranges limited by the head-up display is CE*K, where CE is the ambient light brightness value and K is a fixed value. The ratio of the dimming formula to the ambient light brightness value is a fixed value K. According to the following head-up display brightness contrast ratio calculation formula, the head-up display brightness contrast ratio is K+1 and remains unchanged.

[0070]

[0071] CR is the display brightness contrast ratio of the head-up display; DB is the brightness value of the head-up display; CE is the external ambient light value.

[0072] If the ambient light changes, the range of adjustable brightness levels of the head-up display will be automatically updated according to the different ambient light values. Under different ambient light CE1, CE2, CE3, CE4, CE5, CE6, the range of the brightness adjustment curve formula set by the onboard head-up display is different. The adjustable range of the level decreases as the ambient light increases. When the level remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases.

[0073] If the gear encoder is rotated to change the gear position, the brightness of the head-up display is adjusted on the brightness adjustment curve constructed by the ambient light value in S3, and the brightness adjustment range is [MINDB, MAXDB].

[0074] Under different ambient light conditions, if the gear encoder is rotated to change the gear position, the adjustable display brightness range of the head-up display is [MINDB, MAXDB].

[0075] Select ambient light brightness value CE4 as the default ambient light brightness value. If the ambient light brightness value cannot be read through ambient light sensors 1 and 2, the gear encoder is rotated to change the gear position, and the head-up display brightness is adjusted on the brightness adjustment curve corresponding to the ambient light brightness value CE4.

[0076] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for adjusting brightness of a manual-automatic airborne head-up display, characterized in that: The method is: Read the real-time ambient light value through the ambient light sensor; Get the current gear value through the gear encoder; According to different ambient light values, different brightness adjustment curves are constructed, and the brightness adjustment curves satisfy that the display brightness contrast ratio of the head-up display remains unchanged only when the ambient light changes; If the ambient light changes, the display brightness and adjustable range of the head-up display are automatically updated based on the adaptive brightness adjustment curve according to different ambient light values; If the gear position is changed by rotating the gear encoder, the brightness of the head-up display is forcibly adjusted on the adapted brightness adjustment curve, and the brightness adjustment range is from the minimum brightness to the maximum brightness set for the head-up display; If the automatic brightness adjustment function of the head-up display is deactivated, rotary brightness adjustment remains available.

2. The method for adjusting brightness of a manual-automatic airborne head-up display according to claim 1, characterized in that: The airborne head-up display collects the ambient light brightness value in real time through the communication interface with the ambient light sensor; and sets the ambient light brightness value actually used according to the ambient light brightness value range limited by the airborne head-up display.

3. The method for adjusting brightness of a manual-automatic airborne head-up display according to claim 2, characterized in that: After the onboard head-up display is powered on, the default brightness adjustment gear is set, which can be increased or decreased by rotating the gear encoder.

4. The brightness adjustment method of a manual-automatic airborne head-up display according to claim 3, characterized in that: Under different ambient light conditions, the ratio of the brightness adjustment formula set by the onboard head-up display to the ambient light remains unchanged when the gear encoder remains unchanged.

5. The brightness adjustment method of a manual-automatic airborne head-up display according to claim 4, characterized in that: The brightness adjustment formula is used to calculate the display brightness value of the head-up display after substituting different ambient light values ​​and gear values.

6. The method for adjusting brightness of a manual-automatic airborne head-up display according to claim 5, characterized in that: Under different ambient light conditions, the gear range of the brightness adjustment curve formula set for the airborne head-up display is different; the gear adjustable range decreases as the ambient light increases; when the gear remains unchanged, the slope of the brightness adjustment curve increases as the ambient light increases.

7. The brightness adjustment method of a manual-automatic airborne head-up display according to claim 6, characterized in that: When the ambient light remains unchanged, the slope of the brightness adjustment curve increases as the gear position increases.

8. The method for adjusting brightness of a manual-automatic airborne head-up display according to claim 7, characterized in that: The minimum value of each brightness adjustment curve is the minimum brightness of the head-up display, and the maximum value of each brightness adjustment curve is the maximum brightness of the head-up display.

9. The method for adjusting brightness of a manual-automatic airborne head-up display according to claim 8, characterized in that: The head-up display is set with a default brightness value when automatic brightness adjustment fails. If the automatic brightness adjustment of the head-up display fails, the brightness of the head-up display is adjusted based on the brightness adjustment curve constructed based on the default ambient light value based on the gear position.

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