CN106205502B - A kind of vehicle-mounted back vision display system and its image display method - Google Patents
A kind of vehicle-mounted back vision display system and its image display method Download PDFInfo
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- CN106205502B CN106205502B CN201610566415.4A CN201610566415A CN106205502B CN 106205502 B CN106205502 B CN 106205502B CN 201610566415 A CN201610566415 A CN 201610566415A CN 106205502 B CN106205502 B CN 106205502B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
- G02F1/13318—Circuits comprising a photodetector
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
Abstract
The invention discloses a kind of vehicle-mounted back vision display system and its display methods, vehicle-mounted back vision display system includes: processor and difference light intensity test device, image collecting device and display connected to the processor, light intensity test device, for detecting the environment light light intensity of display；Image collecting device, for acquiring rear view of vehicle image；Processor, the environment light light intensity for being detected according to light intensity test device and the relationship between preset threshold show that the image of image acquisition device controls to display, are maintained at the display light intensity of display within preset range.Since vehicle-mounted back vision display system is instead of rearview mirror in the prior art, relationship between the environment light light intensity detected according to light intensity test device and preset threshold controls display light intensity, to can avoid dazzling the eyes due to caused by the strong light incidence display in rear；It can avoid as reflecting mirror by image acquisition device vehicle rear images as the deficiency of the visual field caused by rearview mirror.
Description
Technical field
The present invention relates to field of display technology, espespecially a kind of vehicle-mounted back vision display system and its image display method.
Background technique
Normal driving vehicle advance and move backward during, driver pass through backsight sem observation rear the case where, be used to
Enough back visibibilities are obtained, to make correct operation judges, guarantee the safety of driving procedure.But due to using at present
Rearview mirror there are certain blind area, the visual field is insufficient and will lead to driver under the irradiation of front vehicle headlight dazzles the eyes the short time
The shortcomings that blinding.Currently, various anti-glare technologies are studied and application, for example, mechanically, electronic type and use quantum dot
The method of the conversion of the light of technology plays the purpose of change strong light dazzling prevention.But back visibibility blind area and back visibibility is insufficient asks
Topic, still remains.
Summary of the invention
The embodiment of the present invention provides a kind of vehicle-mounted back vision display system and its image display method, to prevent rear strong
What light generated guarantees back visibibility while dazzling the eyes.
In a first aspect, the embodiment of the present invention provides a kind of vehicle-mounted back vision display system, comprising: processor, and respectively with
Display, light intensity test device and the image collecting device of the processor connection；Wherein,
The light intensity test device, for detecting the environment light light intensity of the display；
Described image acquisition device, for acquiring rear view of vehicle image；
The processor, the environment light light intensity for being detected according to the light intensity test device and between preset threshold
Relationship shows that the image of described image acquisition device acquisition controls to the display, makes the display light intensity of the display
It is maintained within preset range.
In one possible implementation, in above system provided in an embodiment of the present invention, the display includes
Backlight and the liquid crystal cell on the backlight light direction；
The liquid crystal cell is divided into: the reflecting region reflected the environment light for being incident on the display, and to institute
State the transmission region that the light of backlight transmitting is transmitted.
In one possible implementation, in above system provided in an embodiment of the present invention, the liquid crystal cell includes:
Opposite and the first substrate set and the second substrate, are located at the liquid crystal layer between the first substrate and the second substrate
The first substrate deviates from the liquid crystal layer side away from the first polaroid of the liquid crystal layer side, positioned at the second substrate
The second polaroid, the first wave plate group positioned at the first substrate towards the liquid crystal layer side and be located at second base
Second wave plate group of the plate face to the liquid crystal layer side；Wherein,
The second wave plate group has the resin layer of coating reflectance coating towards the reflecting region of the liquid crystal layer.
In one possible implementation, in above system provided in an embodiment of the present invention, the liquid crystal cell is also wrapped
It includes: the first transparency electrode between the liquid crystal layer and the first wave plate group, the liquid crystal layer positioned at the reflecting region
With the second transparency electrode between the reflectance coating, and liquid crystal layer and the second wave plate group positioned at the transmission region
Between third transparent electrode；
The processor, specifically for the pass between the light intensity and preset threshold that are detected according to the light intensity test device
System applies voltage to the first transparency electrode, second transparency electrode and third transparent electrode respectively, makes the display
Display light intensity is maintained within preset range.
In one possible implementation, in above system provided in an embodiment of the present invention, the liquid crystal cell is also wrapped
It includes: the compensation film layer between the second wave plate group and the liquid crystal layer；
The compensation film layer, for being compensated to backlight phase difference caused by each visual angle.
Second aspect, the embodiment of the present invention provide a kind of image display side based on any of the above-described vehicle-mounted back vision display system
Method, comprising:
The environment light light intensity of light intensity test device detection display；
Image acquisition device rear view of vehicle image；
Processor is according to the relationship between the light intensity test device environment light light intensity detected and preset threshold to institute
It states display and shows that the image of described image acquisition device acquisition is controlled, the display light intensity of the display is made to be maintained at pre-
Within the scope of if.
In one possible implementation, in the above method provided in an embodiment of the present invention, the light-intensity test dress
Set the environment light light intensity of detection display, comprising:
The environment light light intensity that the light intensity test device detects the environment light light intensity of the display, and will test
Electric signal is converted into export to the processor.
In one possible implementation, in the above method provided in an embodiment of the present invention, in the display packet
When including backlight and liquid crystal cell, environment light light intensity and preset threshold that the processor is detected according to the light intensity test device
Between relationship the image of described image acquisition device acquisition, which controls, to be shown to the display, make the aobvious of the display
Show that light intensity is maintained within preset range, comprising:
The processor controls the backlight and closes when the received electric signal is greater than or equal to the preset threshold
It closes, and voltage is applied to the liquid crystal layer of the reflecting region of the liquid crystal cell according to the electric signal, make the liquid of the reflecting region
Liquid crystal molecule in crystal layer deflects, when showing the image of described image acquisition device acquisition, the display of the display
Light intensity is maintained within the preset range.
In one possible implementation, in the above method provided in an embodiment of the present invention, further includes:
The processor controls the backlight and opens when the received electric signal is less than the preset threshold, and
Voltage is applied to the liquid crystal layer of the reflecting region according to the electric signal, while electricity is applied to the liquid crystal layer of the transmission region
Pressure, makes the liquid crystal molecule in the liquid crystal layer of the reflecting region and transmission region deflect, in display described image acquisition dress
When setting the image of acquisition, the display light intensity of the display is maintained within the preset range.
In one possible implementation, in the above method provided in an embodiment of the present invention, further includes:
When light intensity is not detected in the light intensity test device, control described image acquisition device carries out red the processor
Outer Image Acquisition, and control the backlight and open, voltage is applied to the liquid crystal layer of the transmission region, makes the transmission region
Liquid crystal layer in liquid crystal molecule deflect, show described image acquisition device acquisition image when, the display
Display light intensity is maintained within the preset range.
The present invention has the beneficial effect that:
In vehicle-mounted back vision display system and its display methods provided in an embodiment of the present invention, vehicle-mounted back vision display system packet
It includes: processor and respectively light intensity test device, image collecting device and display connected to the processor, light-intensity test dress
It sets, for detecting the environment light light intensity of display；Image collecting device, for acquiring rear view of vehicle image；Processor is used for root
Image collecting device is shown to display according to the relationship between the light intensity test device environment light light intensity detected and preset threshold
The image of acquisition is controlled, and is maintained at the display light intensity of display within preset range.On provided in an embodiment of the present invention
The environment light light that vehicle-mounted back vision display system is stated instead of rearview mirror in the prior art, and is detected according to light intensity test device
The relationship between preset threshold controls display light intensity by force, to can avoid drawing due to the strong light incidence display in rear
That rises dazzles the eyes；And it can avoid by image acquisition device vehicle rear images in the prior art by reflecting mirror as rearview mirror
The visual field caused by and is insufficient, further increases traffic safety.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of vehicle-mounted back vision display system in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of display in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of liquid crystal cell in the embodiment of the present invention；
Fig. 4 is the flow diagram of image display method in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of vehicle-mounted back vision display system and its image display method, to prevent rear strong
What light generated guarantees back visibibility while dazzling the eyes.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
Vehicle-mounted back vision display system and its image that specific embodiment of the invention offer is discussed in detail with reference to the accompanying drawing are aobvious
Show method.
As shown in Figure 1, vehicle-mounted back vision display system provided in an embodiment of the present invention, comprising: processor 11, and respectively with
Display 12, light intensity test device 13 and the image collecting device 14 that processor 11 connects；Wherein,
Light intensity test device 13, for detecting the environment light light intensity of display 12；
Image collecting device 14, for acquiring rear view of vehicle image；
Processor 11, the environment light light intensity for being detected according to light intensity test device 13 and the relationship between preset threshold
The image for showing that image collecting device 14 acquires to display 12 controls, and the display light intensity of display 12 is made to be maintained at default
Within the scope of.
Above-mentioned vehicle-mounted back vision display system provided in an embodiment of the present invention instead of rearview mirror in the prior art, and according to
Relationship between the light intensity test device environment light light intensity detected and preset threshold controls display light intensity, so as to keep away
Exempt to dazzle the eyes due to caused by the strong light incidence display in rear；And it can avoid by image acquisition device vehicle rear images
In the prior art as reflecting mirror as rearview mirror and caused by the visual field it is insufficient, further increase traffic safety.
It is carried out below in conjunction with each section of attached drawing to above-mentioned vehicle-mounted back vision display system provided in an embodiment of the present invention specific
Explanation.
In the specific implementation, in above system provided in an embodiment of the present invention, as shown in Fig. 2, display 12 includes: back
Light source 121 and the liquid crystal cell 122 on 121 light direction of backlight；
Liquid crystal cell 122, which divides, is: the reflecting region a reflected the environment light for being incident on display 12, and to backlight
The transmission region b that the light that source 121 emits is transmitted.
In practical application, dividing liquid crystal cell 122 for reflecting region a and transmission region b two parts, reflecting region a can root
It is reflected according to the environment light for being incident on display 12, and the environment light of reflection is used for image as light source and is shown；And it transmits
Region b is then shown using backlight 121 as light source for image.Electrically controlled birefringence mode liquid crystal can be used in above-mentioned liquid crystal cell 122
Box (Electrically Controlled Birefringence Liquid Crystal Display, abbreviation ECB-LCD),
Advanced super dimension switch type liquid crystal cell (ADvanced Super Dimension Switch Liquid Crystal
Display, abbreviation ADS-LCD) or vertical orientation type liquid crystal cell (Vertical Alignment Liquid Crystal
Display, abbreviation VA-LCD), the liquid crystal cell of above-mentioned mode is preference pattern, and the liquid crystal of other modes also can be used in the application
Box, it is not limited here.
Further, in above system provided in an embodiment of the present invention, as shown in figure 3, liquid crystal cell 122 includes: opposite
And the first substrate 1221 set and the second substrate 1222, the liquid crystal layer between first substrate 1221 and the second substrate 1222
1223, deviate from positioned at first substrate 1221 away from the first polaroid 1224 of 1223 side of liquid crystal layer, positioned at the second substrate 1222
Second polaroid 1225 of 1223 side of liquid crystal layer, the first wave plate group positioned at first substrate 1221 towards 1223 side of liquid crystal layer
1226 and the second wave plate group 1227 positioned at the second substrate 1222 towards 1223 side of liquid crystal layer；Wherein,
Second wave plate group 1227 has the resin layer of coating reflectance coating 1229 towards the reflecting region of liquid crystal layer 1223
1228。
In practical application, ECB-LCD can be selected as above-mentioned liquid crystal cell, the first wave plate group 1226 and the second wave plate group
1227 should cooperate with the first polaroid 1224 and the second polaroid 1225, to control reflecting region a's and transmission region b
Light.For example, the combination of half-wave plate and quarter-wave plate can be selected in the first wave plate group, the second wave plate group uses half-wave plate.This
Outside, to make the light in reflecting region a and transmission region b have equal optical paths, the thickness of the liquid crystal layer in a of reflecting region can be
The half of b thickness of liquid crystal layer in region is penetrated, certainly, also above first polaroid 1224, second of adjustment is inclined according to specific needs
Mating plate 1225, the first wave plate group 1226, the polarisation parameter of the second wave plate group 1227 and reflecting region a and transmission region b are corresponding
Liquid crystal layer thickness ratio, the embodiment of the present invention do not limit its value specifically.
Further, in above system provided in an embodiment of the present invention, as shown in figure 3, liquid crystal cell 122, further includes: position
First transparency electrode 1226 ' between liquid crystal layer 1223 and the first wave plate group 1226, positioned at the liquid crystal layer 1223 of reflecting region a
With the second transparency electrode 1229 ' between reflectance coating 1229, and liquid crystal layer 1223 and the second wave plate positioned at transmission region b
Third transparent electrode 1227 ' between group 1227；
When using above-mentioned structure, processor 11, specifically for the light intensity that is detected according to light intensity test device 13 and pre-
If the relationship between threshold value, respectively to first transparency electrode 1226 ', second transparency electrode 1229 ' and third transparent electrode
1227 ' apply voltage, are maintained at the display light intensity of display 12 within preset range.
In practical application, the display light intensity for reflecting region a can be by being loaded into first transparency electrode 1226 ' and the
The voltage at two transparent electrodes, 1229 ' both ends is controlled, and the light intensity that processor 11 is detected according to light intensity test device 13
The voltage for being loaded into first transparency electrode 1226 ' and second transparency electrode 1229 ' is controlled, in the environment light detected
When light intensity is bigger, the voltage being loaded between above-mentioned two transparent electrode is smaller, then cooperates the transmitted light intensity of transmission region b, to
Application voltage between one transparent electrode, 1226 ' third transparent electrode 1227 ' can control the display light intensity of display to protect as a result,
It holds in the range of the viewing of suitable human eye, effectively prevent dazzling the eyes caused by strong light.
In the specific implementation, in above system provided in an embodiment of the present invention, as indicated at 3, liquid crystal cell 122 also wraps figure
It includes: the compensation film layer 1220 between the second wave plate group 1227 and liquid crystal layer 1223；Film layer 1220 is compensated, for backlight
121 phase differences caused by each visual angle compensate.Specifically, as shown in figure 3, compensation film layer 1220 may be provided at the second wave
Between piece group 1227 and third transparent electrode 1227 '.Further, NH compensation film layer can be used in compensation film layer 1220, above-mentioned
Prescribed electrode can be all made of tin indium oxide (Indium tin oxide, abbreviation ITO) electrode.
Based on the same inventive concept, the embodiment of the present invention provides a kind of figure based on any of the above-described vehicle-mounted back vision display system
As display methods, as shown in figure 4, above-mentioned image display method provided in an embodiment of the present invention, includes the following steps:
The environment light light intensity of S401, light intensity test device detection display；
S402, image acquisition device rear view of vehicle image；
S403, processor are according to the relationship between the light intensity test device environment light light intensity detected and preset threshold to aobvious
Show that device shows that the image of image acquisition device is controlled, is maintained at the display light intensity of display within preset range.
Above-mentioned vehicle-mounted back vision display system provided in an embodiment of the present invention is instead of rearview mirror in the prior art, display
Method is specifically used according to the relationship between the light intensity test device environment light light intensity detected and preset threshold to display light intensity
It is controlled, to can avoid dazzling the eyes due to caused by the strong light incidence display in rear；And it is adopted by image collecting device
Collect vehicle rear images can avoid in the prior art as reflecting mirror as rearview mirror and caused by the visual field deficiency, further increase driving
Safety.
Specifically, in above-mentioned step S401, light intensity test device detects the environment light light intensity of display, specifically can be with
Include:
Light intensity test device detects the environment light light intensity of display, and the environment light light intensity that will test is converted into electric signal
It is exported to the processor.
Since processor is usually handled electric signal, and the control signal of its output is mostly electric signal, therefore, will
Light intensity be converted into electric signal more convenient for subsequent processor according to the electric signal to be applied to the voltage of reflecting region liquid crystal layer into
Row control.
Further, when above-mentioned display includes backlight and liquid crystal cell, in above-mentioned step S403, processor
Image collector is shown to display according to the relationship between the light intensity test device environment light light intensity detected and preset threshold
The image for setting acquisition is controlled, and is maintained at the display light intensity of display within preset range, be can specifically include:
Processor when received electric signal is greater than or equal to preset threshold, close, and according to electric signal by control backlight
Voltage is applied to the liquid crystal layer of the reflecting region of liquid crystal cell, the liquid crystal molecule in the liquid crystal layer of reflecting region is made to deflect,
When showing the image of image acquisition device, the display light intensity of display is maintained within preset range.
In practical application, when the received electric signal of processor is greater than or equal to preset threshold, usually by vehicle rear incident
Environmental light intensity to display is larger, easily causes to dazzle the eyes if control to environment light at this time.Therefore, processor controls at this time
Backlight is closed, and is only performed image display by reflecting region, and processor is according to the size control of incident environment light light intensity
System is applied to the voltage of reflecting region liquid crystal layer.Specifically, the environmental light intensity for being incident on display is bigger, is applied to reflecting region
The voltage of liquid crystal layer is smaller, thus, the deflection angle of liquid crystal son is smaller in reflecting region, drops the reflectivity of reflecting region
It is low, so that the display light intensity to display controls.In specific application, the controlled reflectivity system of the environment light of reflecting region
In 0-10%, it effectively prevent dazzling the eyes caused by the strong light incidence in rear.In addition, driver observes vehicle rear figure by display
Picture guarantees back visibibility, further increases traffic safety.
Further, the above method provided in an embodiment of the present invention, further includes:
Processor when received electric signal is less than preset threshold, open, and according to electric signal to reflection by control backlight
The liquid crystal layer in region applies voltage, while applying voltage to the liquid crystal layer of transmission region, makes the liquid of reflecting region and transmission region
Liquid crystal molecule in crystal layer deflects, and when showing the image of image acquisition device, the display light intensity of display is kept
Within preset range.
In the above case said, light intensity test device detection environment light light intensity be not up to threshold value or it is smaller when, echo area
Domain and transmission region perform image display simultaneously.Specifically, for reflecting region, processor is according to incident environment light light intensity control
System is applied to the voltage of the liquid crystal layer of reflecting region；For transmission region, processor can be according to the reflectivity of reflecting region simultaneously
Applying voltage to the liquid crystal layer of transmission region makes the display light intensity of final display to obtain suitable reflectivity and transmissivity
It is maintained within above-mentioned preset range.In practical application, reflecting region and transmission region can pass through different ITO electricity respectively
Pole is controlled, so that the liquid crystal molecule in reflecting region and transmission region deflects respectively, to reach suitable reflectivity
And transmissivity.
Further, the above method provided in an embodiment of the present invention, further includes:
For processor when light intensity is not detected in light intensity test device, control image collecting device carries out infrared image acquisition,
And backlight opening is controlled, voltage is applied to the liquid crystal layer of transmission region, sends out the liquid crystal molecule in the liquid crystal layer of transmission region
Raw deflection, when showing the image of image acquisition device, the display light intensity of display is maintained within preset range.
Since light intensity is not detected in light intensity test device, i.e., it is incident on display without environment light at this time, then vehicle rear light
It is weaker, therefore be used to show as light source without environment light in reflecting region, to be performed image display by transmission region.Control
It is applied to the voltage of liquid crystal layer two sides in transmission region, the transmission of backlight emergent light is controlled by the deflection of control liquid crystal molecule
Rate, to control display light intensity when image display.Thus, it is ensured that display shows that light intensity remains at suitable range
Within, enable a driver to clearly observe vehicle rear images, ensure that enough visuals field, it is ensured that driver can correct operation sentence
It is disconnected, further increase traffic safety.
In vehicle-mounted back vision display system and its display methods provided in an embodiment of the present invention, vehicle-mounted back vision display system packet
It includes: processor and respectively light intensity test device, image collecting device and display connected to the processor, light-intensity test dress
It sets, for detecting the environment light light intensity of display；Image collecting device, for acquiring rear view of vehicle image；Processor is used for root
Image collecting device is shown to display according to the relationship between the light intensity test device environment light light intensity detected and preset threshold
The image of acquisition is controlled, and is maintained at the display light intensity of display within preset range.On provided in an embodiment of the present invention
The environment light light that vehicle-mounted back vision display system is stated instead of rearview mirror in the prior art, and is detected according to light intensity test device
The relationship between preset threshold controls display light intensity by force, to can avoid drawing due to the strong light incidence display in rear
That rises dazzles the eyes；And it can avoid by image acquisition device vehicle rear images in the prior art by reflecting mirror as rearview mirror
The visual field caused by and is insufficient.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of vehicle-mounted back vision display system characterized by comprising processor, and be connected to the processor respectively
Display, light intensity test device and image collecting device；Wherein,
The light intensity test device, for detecting the environment light light intensity of the display；
Described image acquisition device, for acquiring rear view of vehicle image；
The processor, the environment light light intensity for being detected according to the light intensity test device and the relationship between preset threshold
The image of described image acquisition device acquisition, which controls, to be shown to the display, keeps the display light intensity of the display
Within preset range；
The display includes backlight and the liquid crystal cell on the backlight light direction；
The liquid crystal cell is divided into: the reflecting region reflected the environment light for being incident on the display, and to the back
The transmission region that the light of light source transmitting is transmitted；
The liquid crystal cell includes: the first substrate and the second substrate set relatively, is located at the first substrate and second base
Liquid crystal layer between plate, the first wave plate group positioned at the first substrate towards the liquid crystal layer side and be located at described second
Second wave plate group of the substrate towards the liquid crystal layer side；
Wherein, the second wave plate group has the resin layer of coating reflectance coating towards the reflecting region of the liquid crystal layer；
The liquid crystal cell further include: first transparency electrode between the liquid crystal layer and the first wave plate group is located at institute
State the second transparency electrode between the liquid crystal layer of reflecting region and the reflectance coating and the liquid crystal positioned at the transmission region
Third transparent electrode between layer and the second wave plate group；
The processor, specifically for the relationship between the light intensity and preset threshold that are detected according to the light intensity test device,
Voltage is applied to the first transparency electrode, second transparency electrode and third transparent electrode respectively, makes the aobvious of the display
Show that light intensity is maintained within preset range.
2. the system as claimed in claim 1, which is characterized in that the liquid crystal cell further include: deviate from positioned at the first substrate
First polaroid of the liquid crystal layer side and the second polaroid for deviating from the liquid crystal layer side positioned at the second substrate.
3. the system as claimed in claim 1, which is characterized in that the liquid crystal cell, further includes: be located at the second wave plate group with
Compensation film layer between the liquid crystal layer；
The compensation film layer, for being compensated to backlight phase difference caused by each visual angle.
4. a kind of image display method based on the described in any item vehicle-mounted back vision display systems of claim 1-3, feature exist
In, comprising:
The environment light light intensity of light intensity test device detection display；
Image acquisition device rear view of vehicle image；
Processor is according to the relationship between the light intensity test device environment light light intensity detected and preset threshold to described aobvious
Show that device shows that the image of described image acquisition device acquisition is controlled, the display light intensity of the display is made to be maintained at default model
Within enclosing；
The environment light light intensity of the light intensity test device detection display, comprising:
The light intensity test device detects the environment light light intensity of the display, and the environment light light intensity conversion that will test
It is exported for electric signal to the processor；
When the display includes backlight and liquid crystal cell, ring that the processor is detected according to the light intensity test device
Relationship between border light light intensity and preset threshold shows that the image of described image acquisition device acquisition is controlled to the display
System, is maintained at the display light intensity of the display within preset range, comprising:
The processor controls the backlight and closes when the received electric signal is greater than or equal to the preset threshold,
And voltage is applied to the liquid crystal layer of the reflecting region of the liquid crystal cell according to the electric signal, make the liquid crystal layer of the reflecting region
In liquid crystal molecule deflect, show described image acquisition device acquisition image when, the display light intensity of the display
It is maintained within the preset range.
5. method as claimed in claim 4, which is characterized in that further include:
The processor controls the backlight and opens when the received electric signal is less than the preset threshold, and according to
The electric signal applies voltage to the liquid crystal layer of reflecting region, while applying voltage to the liquid crystal layer of transmission region, makes described anti-
The liquid crystal molecule penetrated in the liquid crystal layer of region and transmission region deflects, in the image of display described image acquisition device acquisition
When, the display light intensity of the display is maintained within the preset range.
6. method as claimed in claim 5, which is characterized in that further include:
For the processor when light intensity is not detected in the light intensity test device, control described image acquisition device carries out infrared figure
It as acquisition, and controls the backlight and opens, voltage is applied to the liquid crystal layer of the transmission region, makes the liquid of the transmission region
Liquid crystal molecule in crystal layer deflects, when showing the image of described image acquisition device acquisition, the display of the display
Light intensity is maintained within the preset range.
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| CN107255877B (en) | 2017-08-09 | 2021-04-13 | 京东方科技集团股份有限公司 | Optical structure, control method thereof and display device |
| CN109140674B (en) * | 2018-08-17 | 2021-03-19 | 宁波奥克斯电气股份有限公司 | Display panel control method and device and air conditioner |
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