CN108152960A - Vehicle-mounted head-up display method and system - Google Patents
Vehicle-mounted head-up display method and system Download PDFInfo
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- CN108152960A CN108152960A CN201810022376.0A CN201810022376A CN108152960A CN 108152960 A CN108152960 A CN 108152960A CN 201810022376 A CN201810022376 A CN 201810022376A CN 108152960 A CN108152960 A CN 108152960A
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- threshold value
- display area
- ambient brightness
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0179—Display position adjusting means not related to the information to be displayed
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
Abstract
This application discloses a kind of vehicle-mounted head-up display method and system, wherein method includes the following steps：Obtain the ambient brightness outside driver's cabin；Ambient brightness and light modulation threshold value are compared, light modulation threshold value includes strong photo threshold and dim light threshold value, and strong photo threshold is more than dim light threshold value；If ambient brightness is more than strong photo threshold, the throughput of head-up display area ambient light is reduced；If ambient brightness is less than dim light threshold value, the volume reflection of head-up display area image light is reduced.Said program, in the case where ambient brightness is higher, by the throughput for reducing head-up display area ambient light, to reduce the light quantity that ambient light enters human eye, the image for being projeced into head-up display area can be seen clearly in the case where not improving bias light, in the case where ambient brightness is relatively low, by the volume reflection for reducing head-up display area image light, the brightness in head-up display area is made to be unlikely to excessively high relative to ambient brightness, the problem of avoiding because the brightness in head-up display area under low light environment is excessively high, and influencing drive safety.
Description
Technical field
Present application relates generally to vehicle-mounted head-up display technical field more particularly to a kind of vehicle-mounted head-up display method and it is
System.
Background technology
Head-up display (Head-up Display, abbreviation HUD) is a kind of vehicle-mounted vision-aided system, head-up display
The instruction information Projection Display such as the car status informations such as speed, oil mass and navigation, dangerous warning is suitable in front of driver
Position on, so as to ensure that without departing from road surface ahead, it is blind to eliminate the vision for bowing and checking instrument board and generating for pilot's line of vision
Area increases traffic safety.
HUD display brightness needs are adjusted according to ambient brightness, make luminance contrast in optimum range, so as to ensure
HUD shows that information can be seen clearly.Luminance contrast characterizes brightness case of the image relative to external environment background：
Wherein, LCR is luminance contrast, LdisplayFor the emitting brightness of head-up display backlight, LambientIt is bright for environment
Degree.
Ambient brightness is in 0.1~1cd/m when night drives2Between, maximum ambient brightness be happened at snowy day and sunlight compared with
In the case of strong, maximum ambient brightness is up to 34000cd/m2.In the case of daytime, LCR should be counted between 1.15~1.5
Calculation, which can obtain HUD display brightness, should at least reach 5100cd/m2, optimal brightness 17000cd/m2.Usually will in the industry at present
15000cd/m2It is set as HUD highest display brightness.For current typical reflective HUD device, image source TFT-LCD's goes out
Brightness is needed higher than 20000cd/m2, it is far longer than hundreds of nit of the display fields such as TV, mobile phone display screen, computer monitor
Display brightness demand all brings challenges to power consumption, heat dissipation and volume.In particular with visual field (the Field of View of HUD；Letter
Claim FOV) gradually increase, backlight illumination demand further increases, and highlighting backlight module has become the pass for restricting TFT-LCD HUD
One of key factor.In addition, existing HUD display brightness is difficult to accomplish 3cd/m2Hereinafter, this is resulted under half-light environment, HUD
Display brightness is excessively high, influences the safety driven.
Invention content
In view of drawbacks described above of the prior art or deficiency, are intended to provide a kind of vehicle-mounted head-up display method and system, use
In the display requirement for meeting HUD under strong light and half-light environment, and reduce the requirement to backlight illumination.
On the one hand the application provides a kind of vehicle-mounted head-up display method, include the following steps：
Obtain the ambient brightness outside driver's cabin；
The ambient brightness and light modulation threshold value are compared, the light modulation threshold value includes strong photo threshold and dim light threshold value,
The strong photo threshold is more than the dim light threshold value；
If the ambient brightness is more than the strong photo threshold, the throughput of head-up display area ambient light is reduced；
If the ambient brightness is less than the dim light threshold value, the volume reflection of head-up display area image light is reduced.
Further, the head-up display area is provided with analyzer；
If the ambient brightness is more than the strong photo threshold, the throughput of head-up display area ambient light, tool are reduced
Body is：
When the ambient brightness is more than the strong photo threshold, the polarization direction of the analyzer is adjusted to P directions.
Further, laser, the polarizer are sequentially arranged in the light path for forming image light；
When the polarization direction of the analyzer is adjusted to P directions, rotating the polarizer makes what the laser was sent out
Polarization direction of the light after the polarizer is P directions.
Further, the head-up display area is provided with analyzer, and laser is sequentially arranged in the light path for forming image light
Device, the polarizer；
If the ambient brightness is less than the dim light threshold value, the volume reflection of head-up display area image light, tool are reduced
Body is：
When the ambient brightness is less than the dim light threshold value, the polarization direction of the analyzer is adjusted to S directions, is turned
Moving the polarizer makes polarization direction of the light that the laser is sent out after the polarizer between P directions and S directions
Between.
Further, the analyzer is liquid crystal layer, and the polarizer is half-wave plate.
Another aspect of the present invention provides a kind of vehicle-mounted head-up display system, including laser, luminance obtaining unit and control
Unit and the polarizer being sequentially arranged along the laser light path, image source, diffuser screen and head-up display area；
The luminance obtaining unit, for obtaining the ambient brightness outside driver's cabin；
Described control unit, for the ambient brightness and light modulation threshold value to be compared, the light modulation threshold value includes strong
Photo threshold and dim light threshold value, the strong photo threshold are more than the dim light threshold value；If the ambient brightness is more than the strong photo threshold,
Then reduce the throughput of head-up display area ambient light；If the ambient brightness is less than the dim light threshold value, head-up display is reduced
The volume reflection of area's image light.
Further, described control unit is used for when the ambient brightness is more than the strong photo threshold, by the analyzing
The polarization direction of device is adjusted to P directions.
Further, described control unit is additionally operable to when adjusting the polarization direction of the analyzer to P directions, rotation
The polarizer makes polarization direction of the light that the laser is sent out after the polarizer be P directions.
Further, described control unit is used for when the ambient brightness is less than the dim light threshold value, by the analyzing
The polarization direction of device, which is adjusted, to S directions, to be rotated the polarizer and makes the light that the laser is sent out after the polarizer
Polarization direction between P directions and S directions.
Further, the analyzer is liquid crystal layer, and the polarizer is half-wave plate.
The said program that the application provides, in the case where ambient brightness is higher, by reducing head-up display area ambient light
Throughput, to reduce the light quantity that ambient light enters human eye, can see clearly in the case where not improving bias light be projeced into it is flat
Depending on the image of viewing area, compared with the prior art, do not need to further increase backlight illumination, correspondingly the technical program also reduces
To power consumption, heat dissipation and volume needs.In the case where ambient brightness is relatively low, by the reflection for reducing head-up display area image light
Amount, the brightness in head-up display area is made to be unlikely to excessively high relative to ambient brightness, avoid because under low light environment head-up display area it is bright
The problem of spending height, and influencing drive safety.
Description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the flow chart of vehicle-mounted head-up display method provided in an embodiment of the present invention；
Fig. 2 is the fundamental diagram of vehicle-mounted head-up display system strong light environment provided in an embodiment of the present invention；
Fig. 3 is the fundamental diagram of vehicle-mounted head-up display system low light environment provided in an embodiment of the present invention.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, illustrated only in attached drawing with inventing relevant part.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in Figure 1, vehicle-mounted head-up display method provided in an embodiment of the present invention, includes the following steps：
S10：Obtain the ambient brightness outside driver's cabin；
Fig. 2 is see also, is driven by being arranged on the light sensor (Light-Sensor) at vehicle windshield 9 to perceive
Sail outdoor ambient brightness.
S20：The ambient brightness and light modulation threshold value are compared, the light modulation threshold value includes strong photo threshold and dim light threshold
Value, the strong photo threshold are more than the dim light threshold value；
In order to adapt to low light environment and strong light environment simultaneously, head-up display area 10 is under strong light environment and low light environment
Ideal luminance contrast is respectively provided with, improves the readability of 10 image of head-up display area, then dims threshold value and is set as two, respectively
For strong photo threshold and dim light threshold value, strong photo threshold is used to characterize the ring for needing to reduce head-up display area light throughput under intense light conditions
Border brightness value, dim light threshold value are used to characterize the ambient brightness value for needing to reduce image light volume reflection under low light condition.Strong light environment
Can be, but not limited to for fine day backlight traveling, snow after fine day backlight traveling etc., low light environment can be rainy days, night etc..Root
According to ambient brightness and the comparison result of light modulation threshold value, selective execution step S30 or S40.
S30：If the ambient brightness is more than the strong photo threshold, the throughput of 10 ambient light of head-up display area is reduced；
S40：If the ambient brightness is less than the dim light threshold value, the volume reflection of 10 image light of head-up display area is reduced.
Wherein, strong photo threshold and dim light threshold value can be set according to the brightness of the backlight of vehicle-mounted head-up display system.
If the backlight maximum brightness of vehicle-mounted head-up display system is 15000cd/m2, then such as, but not limited to can be by strong light
Threshold value is also set as 14000cd/m2, it is higher than 14000cd/m in ambient brightness2When, if the ambient light in the range of human eye form 8 is straight
It connects from head-up display area 10 and enters human eye 7, human eye 7 can be influenced since its brightness is excessively high to the shadow that is projected in head-up display area 10
The observation of picture, the interior image projected in head-up display area 10 are formed at the virtual image 11 in 9 front of windshield.Pass through reduction at this time
The throughput of 10 ambient light of head-up display area to reduce the overall brightness that human eye 7 observes head-up display area, improves the strong ring of light
Luminance contrast under border can be improved flat with reaching with the virtual image 11 of institute's projection formation in normal observation head-up display area 10
Depending on the readability of display system.
If the backlight minimum brightness of vehicle-mounted head-up display system is 3cd/m2, then such as, but not limited to can be by dim light threshold value
Also it is set as 2.5cd/m2, it is less than 2.5cd/m in ambient brightness2When, vehicle-mounted head-up display system is directly projected to head-up display area
The brightness of image light is higher than ambient brightness, observation of the human eye 7 to vehicle external environment can be influenced, at this time by reducing head-up display area 10
The brightness of projected image light namely the volume reflection for reducing head-up display area image light, head-up display is observed to reduce human eye 7
The overall brightness in area 10 improves the luminance contrast under low light environment, with reach can be in normal observation head-up display area 10
The virtual image 11 formed is projected, and does not influence the purpose observed vehicle external environment.
Certainly, it when ambient brightness is between strong photo threshold and dim light threshold value, is adjusted according to the relational expression of luminance contrast
The backlight illumination (image source brightness) of head-up display system achievees the purpose that clearly observing head-up display area projects image.
Further, the head-up display area is provided with analyzer；If the ambient brightness is more than the strong light threshold
Value then reduces the throughput of head-up display area ambient light, specially：It, will when the ambient brightness is more than the strong photo threshold
The polarization direction 14 of the analyzer is adjusted to P directions.
Due to entering the ambient light 12 of human eye through windshield based on S-polarization light (polarization vector is vertical with the plane of incidence)
So by setting analyzer in head-up display area 10, when ambient brightness is excessively high namely higher than strong photo threshold, by analyzer
Polarization direction is adjusted to P directions, and S-polarization light cannot pass through head-up display area 10 at this time, that is, reduce 10 environment of head-up display area
The throughput of light improves the luminance contrast under strong light environment, can make human eye 7 be relatively easy to observation be clearly projeced into it is flat
Depending on the influence of viewing area 10.
Further, laser 1, the polarizer 2 are sequentially arranged in the light path for forming image light；By the inclined of the analyzer
Direction shake when adjusting to P directions, rotating the polarizer 2 makes the light that the laser 1 is sent out after the polarizer 2
Polarization direction 13 is P directions.
At this point, the image source of head-up display system is P polarization light, and the polarization direction of analyzer is also P directions, this feelings
The image light that condition figure below image source 3 is emitted enters human eye 7 behind head-up display area 10 directly reflection, before windshield 9
Form the virtual image 11 that polarization direction 15 is P directions.Such situation is that ensure that the brightness for being projeced into the usually image of viewing area 10,
The S-polarization light of external environment is obstructed again, can more clearly show that image source projects what is formed in head-up display area
The virtual image 11.
Further, Fig. 3 is see also, head-up display area 10 is provided with analyzer, in the light path for forming image light sequentially
Laser 1, the polarizer 2 are set；If the ambient brightness is less than the dim light threshold value, 10 image of head-up display area is reduced
The volume reflection of light, specially：When the ambient brightness is less than the dim light threshold value, the polarization direction of the analyzer is adjusted
To S directions, rotating the polarizer 2 makes polarization direction 13 of the light that the laser 1 is sent out after the polarizer 2 be situated between
Between P directions and S directions.
Under low light environment, the light of vehicle external environment is needed to enter human eye 7 to greatest extent to the greatest extent, and need to reduce simultaneously to project
The volume reflection of 10 image light of head-up display area is reduced in the brightness of image in head-up display area 10 namely requirement.Due to through front glass
Glass 9 enter human eye 7 ambient light based on S-polarization light (polarization vector is vertical with the plane of incidence) so by head-up display area 10
Analyzer is set, when ambient brightness is too low namely less than dim light threshold value, the polarization direction 16 of analyzer is adjusted to S directions,
The S-polarization light of external environment can smoothly pass through head-up display area 10 at this time.At this point, the rotation polarizer 2 sends out laser 1
Polarization direction 13 of the light after the polarizer 2 between P directions and S directions, since the polarization direction 16 of analyzer is S
Direction, then only the image light in S directions can be reflected, and the virtual image that polarization direction 17 is S directions is formed in 9 front of windshield
11, it both can reach the purpose for reducing the brightness of image for being projeced into head-up display area 10 in this way, improve low light environment brightness contrast
Degree.
Further, analyzer can select liquid crystal layer, and the polarizer 2 can select half-wave plate.Use half-wave plate can with gram
Take common polaroid luminous energy loss problem.
As shown in Figure 2 and Figure 3, the embodiment of the present invention also provides a kind of vehicle-mounted head-up display system, including laser 1, brightness
Acquiring unit (not shown) and control unit (not shown) and the polarizer being sequentially arranged along 1 light path of laser
2nd, image source 3, diffuser screen 4 and head-up display area 10；Head-up display area 10 is used to form on the preceding shelves glass 9 of vehicle.Brightness
Acquiring unit, for obtaining the ambient brightness outside driver's cabin；Control unit, for ambient brightness and light modulation threshold value to be compared
Compared with light modulation threshold value includes strong photo threshold and dim light threshold value, and strong photo threshold is more than dim light threshold value；If ambient brightness is more than strong light threshold
Value then reduces the throughput of 10 ambient light of head-up display area；If ambient brightness is less than dim light threshold value, head-up display area 10 is reduced
The volume reflection of image light.
LSP (Laser Scanning Projection, laser scanning projection), DLP may be used in image source 3
(Laser Holography Projection, laser are complete by (Digital Light Processing, digital light processing), LHP
Breath projection) etc..
Head-up display area can be directly projeced by the image light of diffuser screen, it can also be sequentially through plane mirror 6
And concave mirror 5 changes the light path of image light, enables to be projeced into the virtual image 11 that head-up display area 10 is formed and amplify.
The operation principle and effect of the vehicle-mounted head-up display system, referring to the description of the above method, which is not described herein again.
Further, control unit is used for when ambient brightness is more than the strong photo threshold, by the polarization direction of analyzer
It adjusts to P directions.
Further, control unit is additionally operable to when adjusting the polarization direction of analyzer to P directions, rotates the polarizer 2
It is P directions to make polarization direction of the light that laser 1 is sent out after the polarizer 2.The pivot center of the polarizer 2 and laser 1
The light ray parallel sent out.
Further, control unit is used to, when ambient brightness is less than dim light threshold value, the polarization direction of analyzer be adjusted
To S directions, the rotation polarizer 2 makes polarization direction of the light that laser 1 is sent out after the polarizer 2 between P directions and S directions
Between.
Further, analyzer is liquid crystal layer, and the polarizer 2 is half-wave plate.
The preferred embodiment and the explanation to institute's application technology principle that above description is only the application.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology that the specific combination of above-mentioned technical characteristic forms
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
The other technical solutions for arbitrarily combining and being formed.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical solution that the technical characteristic of energy is replaced mutually and formed.
Claims (10)
1. a kind of vehicle-mounted head-up display method, which is characterized in that include the following steps：
Obtain the ambient brightness outside driver's cabin；
The ambient brightness and light modulation threshold value are compared, the light modulation threshold value includes strong photo threshold and dim light threshold value, described
Strong photo threshold is more than the dim light threshold value；
If the ambient brightness is more than the strong photo threshold, the throughput of head-up display area ambient light is reduced；
If the ambient brightness is less than the dim light threshold value, the volume reflection of head-up display area image light is reduced.
2. vehicle-mounted head-up display method according to claim 1, which is characterized in that the head-up display area is provided with analyzing
Device；
If the ambient brightness is more than the strong photo threshold, the throughput of head-up display area ambient light is reduced, specially：
When the ambient brightness is more than the strong photo threshold, the polarization direction of the analyzer is adjusted to P directions.
3. vehicle-mounted head-up display method according to claim 2, which is characterized in that in the light path for forming image light sequentially
Laser, the polarizer are set；
When the polarization direction of the analyzer is adjusted to P directions, the light that the polarizer sends out the laser is rotated
Polarization direction after the polarizer is P directions.
4. vehicle-mounted head-up display method according to claim 1, which is characterized in that the head-up display area is provided with analyzing
Device is sequentially arranged laser, the polarizer in the light path for forming image light；
If the ambient brightness is less than the dim light threshold value, the volume reflection of head-up display area image light is reduced, specially：
When the ambient brightness is less than the dim light threshold value, the polarization direction of the analyzer is adjusted to S directions, rotates institute
Stating the polarizer makes polarization direction of the light that the laser is sent out after the polarizer between P directions and S directions.
5. vehicle-mounted head-up display method according to claim 3 or 4, which is characterized in that the analyzer be liquid crystal layer, institute
The polarizer is stated as half-wave plate.
6. a kind of vehicle-mounted head-up display system, which is characterized in that including laser, luminance obtaining unit and control unit and
The polarizer, image source, diffuser screen and the head-up display area being sequentially arranged along the laser light path；
The luminance obtaining unit, for obtaining the ambient brightness outside driver's cabin；
Described control unit, for the ambient brightness and light modulation threshold value to be compared, the light modulation threshold value includes strong light threshold
Value and dim light threshold value, the strong photo threshold are more than the dim light threshold value；If the ambient brightness is more than the strong photo threshold, drop
The throughput of low head-up display area ambient light；If the ambient brightness is less than the dim light threshold value, head-up display area figure is reduced
As the volume reflection of light.
7. vehicle-mounted head-up display system according to claim 6, which is characterized in that described control unit is used in the ring
When border brightness is more than the strong photo threshold, the polarization direction of the analyzer is adjusted to P directions.
8. vehicle-mounted head-up display system according to claim 7, which is characterized in that described control unit is additionally operable to by institute
When stating the polarization direction of analyzer and adjusting to P directions, described in light that rotating the polarizer sends out the laser passes through
Polarization direction after the polarizer is P directions.
9. vehicle-mounted head-up display system according to claim 6, which is characterized in that described control unit is used in the ring
When border brightness is less than the dim light threshold value, the polarization direction of the analyzer is adjusted to S directions, rotating the polarizer makes institute
The polarization direction of light that laser is sent out after the polarizer is stated between P directions and S directions.
10. according to the vehicle-mounted head-up display system of claim 6-9 any one of them, which is characterized in that the analyzer is liquid
Crystal layer, the polarizer are half-wave plate.
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| CN201810022376.0A CN108152960B (en) | 2018-01-10 | 2018-01-10 | Vehicle-mounted head-up display method and system |
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|---|---|---|---|
| CN201810022376.0A CN108152960B (en) | 2018-01-10 | 2018-01-10 | Vehicle-mounted head-up display method and system |
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|---|---|
| CN108152960B (en) | 2020-05-15 |
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