CN110277070A - Display device and display methods - Google Patents
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- CN110277070A CN110277070A CN201910658850.3A CN201910658850A CN110277070A CN 110277070 A CN110277070 A CN 110277070A CN 201910658850 A CN201910658850 A CN 201910658850A CN 110277070 A CN110277070 A CN 110277070A
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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
Abstract
The invention discloses a kind of display device and display methods.Display device includes PWM unit, back light unit and display unit.PWM unit is to generate pulse width modulation signal.Back light unit couples PWM unit, to issue backlight according to pulse width modulation signal.Display unit is to receive backlight to show picture.When display device operates on first mode, the frequency of backlight is first frequency.When display device starts second mode, the frequency shift of backlight is second frequency, and second frequency is different from image capture unit shutter frequency.
Description
Technical field
The present invention be it is related with display device, especially with respect to a kind of display device with anti-theft shooting function and display side
Method.
Background technique
In recent years, with the fast development of display technology, different types of display device has been widely used, but same
When also bring many problem and puzzlement to be more and more taken seriously especially with respect to the subject under discussion of message safety.
For example, in the occasion (such as underground conclave) of certain need for confidentiality or no photo, due to
Data need for confidentiality shown by display device, it will usually indicate the poster of " no photo " or by way of manually monitoring come
Data shown by display device is avoided to be taken on the sly and let out by intentionally personage.
However, aforesaid way is actually only capable of having the function that good will is reminded, taking on the sly for intentionally personage can not be prevented completely
Behavior causes the message safety of display device to start a leak, it would be highly desirable to improve.
Summary of the invention
In view of this, the present invention proposes a kind of display device and display methods with anti-theft shooting function, effectively to solve
The above problem that prior art is suffered from.
It is according to a particular embodiment of the invention a kind of display device.In this embodiment, display device includes pulsewidth tune
Become unit, back light unit and display unit.PWM unit is to generate pulse width modulation signal.Back light unit couples pulsewidth tune
Become unit, to issue backlight according to pulse width modulation signal.Display unit is to receive backlight to show picture.Work as display device
When operating on first mode, the frequency of backlight is first frequency.When display device starts second mode, the frequency shift of backlight
For second frequency, and second frequency is different from image capture unit shutter frequency.
In an embodiment, second mode is anti-mode of taking on the sly, and second frequency is different from image capture unit shutter frequency
The multiple of rate.
In an embodiment, duty cycle of backlight in default duty cycle range in changing or second frequency is in default
It is changed in frequency range.
In an embodiment, display unit has multiple display areas, and what reception back light unit was issued respectively has not
The backlight of same frequency and with different frequency show picture.
In an embodiment, display unit has the first display area and the second display area.The running of first display area
In first mode and the second display area operates on second mode.
In an embodiment, when display device operates on second mode, the frequency of backlight is second frequency and third frequency
Rate periodically alternating or aperiodicity alternating, and third frequency is different from image capture unit shutter frequency.
It is according to another embodiment of the present invention a kind of display methods.In this embodiment, display methods is applied to
Display device.Display device includes display unit.Display methods includes the following steps: to generate pulse width modulation signal；When display fills
It sets when operating on first mode, backlight is issued according to pulse width modulation signal and shows picture to display unit, wherein the frequency of backlight
Rate is first frequency；And when display device starts second mode, change the frequency of backlight as second frequency, and second frequency
Different from image capture unit shutter frequency.
In an embodiment, which is anti-mode of taking on the sly, and the second frequency is different from the image capture unit
The multiple of shutter frequency.
In an embodiment, duty cycle of the backlight in changed in default duty cycle range or the second frequency in
It is changed within the scope of predeterminated frequency.
In an embodiment, which has multiple display areas, and multiple display area receives respectively to be had not
The backlight of same frequency and with different frequency show picture.
In an embodiment, which has the first display area and the second display area, first display area
It operates on the first mode and second display area operates on the second mode.
In an embodiment, when the display device operates on the second mode, the frequency of the backlight is the second frequency
Replace with the periodicity of third frequency or aperiodicity replaces, and the third frequency is different from the image capture unit shutter frequency
Rate.
Compared to prior art, when display device starting of the invention prevents taking on the sly mode, backlighting frequency can be adjusted
For the shutter frequency (further, also to may differ from shutter frequency and its multiple) different from image capture unit, use anti-
Only image capture unit is taken on the sly.Furthermore the anti-backlighting frequency taken on the sly under mode and duty cycle can be within a preset range
It changes a little, uses the anti-effect taken on the sly of enhancing.Prevent in addition, specific display area starting may be selected in display device of the invention
It takes on the sly mode, uses elasticity when increasing practical application.
It can be obtained further by detailed description of the invention below and institute's accompanying drawings about the advantages and spirit of the present invention
Solution.
Detailed description of the invention
Fig. 1 is the functional block diagram for the display device being painted in preferred embodiment of the invention.
Fig. 2A and Fig. 2 B is painted respectively when display unit operates on first mode (such as normal displaying mode) and the second mould
Shown picture when formula (such as anti-mode of taking on the sly).
The backlight that Fig. 3 A to Fig. 3 C is painted when operating on second mode (such as anti-mode of taking on the sly) respectively has different operating
The schematic diagram in period.
Fig. 4 is painted the schematic diagram that display unit has multiple display areas.
Fig. 5 is painted the schematic diagram that only a part of display area operates on second mode (such as anti-mode of taking on the sly).
Fig. 6 is painted the flow chart of the display methods in another preferred embodiment of the invention.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment specifically
It is bright as follows.
A specific embodiment according to the present invention is a kind of display device.Fig. 1 is please referred to, Fig. 1 is painted in this embodiment
The functional block diagram of display device.
As shown in Figure 1, display device 1 includes PWM unit 10, back light unit 12 and display unit 14.Pulse Width Modulation
Unit 10 couples back light unit 12.PWM unit 10 is to generate pulse width modulation signal PWM and output pulse width modulation signal
PWM is to back light unit 12.When back light unit 12 receives pulse width modulation signal PWM, back light unit 12 is interrogated according to Pulse Width Modulation
Number PWM issues backlight L to display unit 14.Display unit 14 receives backlight L to show picture.
In practical application, PWM unit 10 can be any device that can produce pulse width modulation signal, such as arteries and veins
Width modulation signal generator, but not limited to this；Display unit 14 can be any kind of display panel, such as liquid crystal display
Panel or LED display panel, but not limited to this；Any kind of backlight can be used in back light unit 12, such as adopts
Use light emitting diode as backlight, but not limited to this.
It should be noted that display device 1 in this embodiment is (such as normal aobvious in addition to that can operate on traditional first mode
Show mode) except, can also operate on second mode (such as anti-take on the sly mode), and can between first mode and second mode into
Row switching.For example, user can be by virtually cutting shown by the switching key or touching display unit 14 by pressing entity
The mode for changing key issues switching command, and display device 1 can carry out between first mode and second mode according to switching command
Switching.
When display device 1 operates on first mode (such as normal displaying mode), back light unit 12 is according to Pulse Width Modulation
The frequency for the backlight L that signal PWM is issued is first frequency.When display device 1 starts second mode (such as anti-mode of taking on the sly)
When, the frequency for the backlight L that back light unit 12 is issued according to pulse width modulation signal PWM can become second frequency from first frequency,
And second frequency is different from the shutter frequency of image capture unit.Further, second frequency is different from image capture unit
While shutter frequency, also different from the multiple of shutter frequency (such as 2 times of amplifications, 3 times of amplifications, four times of amplifications).Below with not
It is same as shutter frequency and multiple is described.In practical application, image capture unit can be camera or other with image
The device of acquisition function.Assuming that the shutter frequency of image capture unit is 60Hz, then back light unit 12 is sent out under the second mode
The second frequency of backlight L out be different from the frequencies such as 60Hz and its multiple 120Hz, 180Hz, 240Hz, and can be 50Hz,
The frequencies such as 65Hz, 128Hz, 172Hz, 230Hz, but not limited to this.
In other words, when display device 1 starts second mode, the frequency of backlight L received by display unit 14 is different
In the shutter frequency and its multiple of image capture unit, so that display unit 14 shows that the backlighting frequency of picture is also different from image
The shutter frequency and its multiple of capture device.Therefore, when there is human desires to take on the sly shown by display unit 14 using image capture unit
Picture when, since display device 1 has been turned on second mode, display unit 14 shows that the backlighting frequency of picture is picked different from image
The shutter frequency and its multiple for taking device cause image taken by image capture unit not clear enough and are difficult to recognize image
Content is used and achievees the effect that anti-take on the sly.
For example, A and Fig. 2 B, Fig. 2A and Fig. 2 B are painted respectively when display unit 14 operates on the first mould referring to figure 2.
Shown picture when formula and second mode.
As shown in Figure 2 A, when display device 1 operates on first mode, since back light unit 12 is according to pulse width modulation signal
The first frequency that the backlight L that PWM is issued has is identical as the shutter frequency of image capture unit or its multiple, so passing through shadow
As capture device shooting display unit 14 shows that quite clearly image can be obtained in picture.When human eye sees image capture unit institute
When the image of shooting, can recognize its presentation content easily is " Testing 123 ".
As shown in Figure 2 B, when display device 1 starts second mode, since back light unit 12 is according to pulse width modulation signal
The frequency for the backlight L that PWM is issued becomes second frequency from the first frequency of script, and second frequency is filled different from image capture
The shutter frequency and its multiple set, so it is unintelligible to show that picture is only capable of obtaining by image capture unit shooting display unit 14
Image.When image captured by human eye sees image capture unit, it is difficult to which recognizing its presentation content is " Testing
123 ", therefore the anti-effect taken on the sly can be really achieved.
In practical application, it is assumed that in the flrst mode, the back that back light unit 12 is issued according to pulse width modulation signal PWM
Light L has the first duty cycle T.When display device 1 starts second mode, back light unit 12 is according to pulse width modulation signal PWM
The duty cycle of the backlight L issued need to be less than the first duty cycle T, such as the work of backlight L depicted in Fig. 3 A to Fig. 3 C
Period is respectively 0.5T, 0.75T and 0.25T, and but not limited to this.
In an embodiment, the duty cycle for the backlight L that back light unit 12 issues under the second mode can be in a default work
Make to change a little in periodic regime (such as ± 5%), but not limited to this.If with the duty cycle of backlight L depicted in Fig. 3 A
For 0.5T, the duty cycle of backlight L can be changed a little for duty cycles such as 0.475T, 0.49T, 0.51T, 0.525T, but
It is not limited.
Whereby, the picture shown under second mode of display unit 14 can be changed a little due to the duty cycle of backlight L
Effect, and image capture unit is made to be more difficult to take clearly image, therefore anti-the effect of taking on the sly can be enhanced.However,
In practical application, the duty cycle mobility scale of backlight L also be should not be too large, and can be examined when watching display unit 14 to avoid user
Feel that backlight L is changed.
In another embodiment, the second frequency for the backlight L that back light unit 12 issues under the second mode also can be pre- in one
If changing a little in frequency range (such as ± 5%), but not limited to this.Assuming that the second frequency of backlight L is 50Hz, then second
Frequency can be changed a little for frequencies such as 47.5Hz, 48.7Hz, 49.5Hz, 51Hz, 52.5Hz, and but not limited to this.
Whereby, the picture shown under second mode of display unit 14 can be due to effect that the frequency of backlight L changes a little
Fruit, and image capture unit is made to be more difficult to take clearly image, therefore anti-the effect of taking on the sly can be enhanced.However, in reality
In, the frequency variation range of backlight L also be should not be too large, and can perceive backlight when watching display unit 14 to avoid user
L is changed.
It should be noted that above-described embodiment is illustrated the case where only having single display region with display unit 14.
However, display unit 14 actually can also have multiple display areas simultaneously, and multiple display area is optionally divided
It does not operate under different mode (such as first mode and second mode), uses and receive the having of being issued of back light unit 12 respectively
The backlight L of different frequency (such as first frequency and second frequency) is to show picture.
In practical application, the shape of multiple display area, region point-score possessed by display unit 14 and arrangement type
Formula has no specific limitation, holds depending on actual demand.For example, multiple display area can be matrix arrangement, level
Stripe-arrangement or vertical stripe arrangement, but not limited to this.
It should be noted that when back light unit 12 uses light emitting diode as backlight, due to LED backlight
Technology can be divided into two kinds of straight-down negative (Direct Back-Lit) and side illuminated (Edge LED Back-Lit), therefore, work as backlight
When unit 12 is using straight-down negative LED backlight technology or side illuminated LED backlight technology, display unit 14 is somebody's turn to do
The region point-score and type of array of multiple display areas also will be different.
It is assumed that display unit 14 has the first display area R4 of display area R1~the 4th, and the first display
The display area R4 of region R1~the 4th is with (2*2) matrix arrangement, and but not limited to this.In this embodiment, the first viewing area
Each display area in the display area R4 of domain R1~the 4th can selectively operate on according to actual needs first mode or
Under second mode.
For example, as shown in figure 5, if only having the second display area in the first display area R4 of display area R1~the 4th
" EFGH " shown by R2 need to prevent from being taken on the sly, as " ABCD ", third display area R3 shown by the first display area R1
" MNOP " shown by shown " IJKL " and the 4th display area R4 is then not required to prevent from being taken on the sly, then maintains the first viewing area
Domain R1, third display area R3 and the 4th display area R4 are operated under first mode, and the second display area R2 is switched to
Second mode.
The first display area R1, third display area R3 and the 4th display area R4 operated under first mode is received
The backlight L arrived has first frequency, and first frequency is identical as the shutter frequency of image capture unit or its multiple, so that image
Capture device can take the sharp image of the first display area R1, third display area R3 and the 4th display area R4, therefore
Human readable goes out " IJKL " shown by " ABCD ", third display area R3 shown by the first display area R1 and the 4th aobvious
Show " MNOP " shown by the R4 of region；Operating on backlight L received by the second display area R2 under second mode has the
Two frequencies, and second frequency is different from the shutter frequency and its multiple of image capture unit, so that image capture unit is difficult to clap
The sharp image to the second display area R2 is taken the photograph, therefore when eye-observation is by image taken by image capture unit, it can not
It picks out and uses that the display area for achieving the effect that selected section is anti-to take on the sly shown by the second display area R2 " EFGH ".
It should be noted that above-described embodiment is that the backlight L issued under the second mode with back light unit 12 only has list
A kind of the case where frequency (that is, second frequency), is illustrated.However, back light unit 12 is under the second mode in practical application
The frequency of the backlight L issued can also be multi-frequency periodically alternating or aperiodicity alternating.
For example, when display device 1 operates on second mode, the frequency for the backlight L that back light unit 12 is issued can
With to be second frequency (such as 55Hz) periodically replace with third frequency (such as 65Hz) or aperiodicity alternating, and second frequency
(such as 55Hz) and third frequency (such as 65Hz) are different from the shutter frequency (such as 60Hz) of image capture unit and its again
Number.
Whereby, shown picture can be because be different from the shutter of image capture unit under the second mode for display unit 14
A variety of backlighting frequencies (such as 55Hz and 65Hz) of frequency (such as 60Hz) and its multiple periodically alternating or aperiodicity alternating
Effect, and to be more difficult to obtain clearly image when the display picture of image capture unit shooting display unit 14, therefore energy
Reach preferably anti-effect of taking on the sly.
In another embodiment, it is assumed that the second display area R2 and third display area R3 in Fig. 4 operate on the first mould
Under formula and the first display area R1 and the 4th display area R4 are operated under second mode.Second operated under first mode shows
Show region R2 and third display area R3 received backlight L frequency be first frequency (such as 60Hz), and first frequency with
The shutter frequency (such as 60Hz) of image capture unit or its multiple are identical.
As for the first display area R1 operated under second mode received backlight L frequency be second frequency (example
Such as 55Hz) periodically replace with third frequency (such as 65Hz) or aperiodicity replaces, and second frequency and third frequency are not
It is same as the shutter frequency (such as 60Hz) and its multiple of image capture unit；Operate on the 4th display area R4 under second mode
The frequency of received backlight L to be that the 4th frequency (such as 50Hz) and the 5th frequency (such as 70Hz) are periodical replace or aperiodic
Property alternating, and the 4th frequency and the 5th frequency are different from the shutter frequency (such as 60Hz) and its multiple of image capture unit.
From the above: different display areas (that is, the first display area of second mode is operated in display unit 14
R1 and the 4th display area R4) the backlight L with different frequency (that is, second frequency~the 5th frequency) can be received respectively, wherein
Those frequencies are different from the shutter frequency and its multiple of image capture unit, and those frequencies can each other periodically alternately or
Aperiodicity alternating.
Whereby, when image capture unit shooting display unit 14 shown by picture when, only operate under first mode
Display area (that is, second display area R2 and third display area R3) clearly image can be photographed, as operating on
Display area (that is, first display area R1 and the 4th display area R4) under second mode is then difficult to be photographed clearly
Image, therefore its presentation content can not be recognized, so that the display area to be maintained secrecy (that is, the first display area in display unit 14
R1 and the 4th display area R4) good anti-effect of taking on the sly can be reached.
It is according to another embodiment of the present invention a kind of display methods.In this embodiment, the application of display methods system
In display device, and display device includes display unit, such as display panel, and but not limited to this.
Fig. 6 is please referred to, Fig. 6 is painted the flow chart of the display methods in this embodiment.As shown in fig. 6, display methods includes
The following steps:
Step S10: pulse width modulation signal is generated；
Step S12: when display device operates on first mode (such as normal displaying mode), according to pulse width modulation signal
It issues backlight and shows picture to display unit, wherein the frequency of backlight is first frequency；And
Step S14: when display device starts second mode (such as anti-mode of taking on the sly), the frequency for changing backlight is second
Frequency, and second frequency is different from image capture unit shutter frequency.
In practical application, second frequency is different from image capture unit shutter frequency and its multiple.
In practical application, second frequency is different from the multiple of image capture unit shutter frequency and second frequency can be in pre-
If being changed in frequency range；The duty cycle of backlight can change in default duty cycle range.Display unit can have multiple
Display area receives the backlight with different frequency that back light unit is issued respectively and shows picture with different backlighting frequencies.
For example, display unit can have the first display area and the second display area, and the first display area operates on the first mould
Formula and the second display area operates on second mode, but not limited to this.
In addition, the frequency of backlight can also be by second frequency and third frequency when display device operates on second mode
Rate periodically alternating or aperiodicity alternating, and second frequency and third frequency are different from the shutter frequency of image capture unit
Rate.
Compared to prior art, when display device and display methods of the invention, starting is anti-take on the sly mode when, backlight frequency
Rate can be adjusted to shutter frequency and its multiple different from image capture unit, and using prevents image capture unit from being stolen
It claps.Furthermore the anti-backlighting frequency taken on the sly under mode and duty cycle can change a little within a preset range, use enhancing anti-theft
The effect of bat.In addition, the specific anti-mode of taking on the sly of display area starting may be selected in display device and its display methods of the invention,
Use elasticity when increasing practical application.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (12)
1. a kind of display device characterized by comprising
PWM unit, to generate pulse width modulation signal；
Back light unit couples the PWM unit, to issue backlight according to the pulse width modulation signal；And
Display unit, to receive the backlight to show picture；
Wherein, when the display device operates on first mode, the frequency of the backlight is first frequency；When the display device starts
When second mode, the frequency shift of the backlight is second frequency, and the second frequency is different from image capture unit shutter frequency.
2. display device as described in claim 1, which is characterized in that the second mode is anti-mode of taking on the sly, and second frequency
Rate is different from the multiple of the image capture unit shutter frequency.
3. display device as described in claim 1, which is characterized in that the duty cycle of the backlight is in default duty cycle range
Interior variation or the second frequency within the scope of predeterminated frequency in changing.
4. display device as described in claim 1, which is characterized in that the display unit has multiple display areas, multiple
Display area receives backlight with different frequency that the back light unit is issued respectively and shows picture with different frequency.
5. display device as described in claim 1, which is characterized in that the display unit is aobvious with the first display area and second
Show region, which operates on the first mode and second display area operates on the second mode.
6. display device as described in claim 1, which is characterized in that, should when the display device operates on the second mode
The frequency of backlight is that the second frequency replaces with the periodicity of third frequency or aperiodicity replaces, and the third frequency is different from
The image capture unit shutter frequency.
7. a kind of display methods is applied to display device, which includes display unit, which is characterized in that the display side
Method includes the following steps:
Generate pulse width modulation signal；
When the display device operates on first mode, backlight is issued to the display unit to show according to the pulse width modulation signal
Picture, wherein the frequency of the backlight is first frequency；And
When the display device starts second mode, the frequency for changing the backlight is second frequency, and the second frequency is different from
Image capture unit shutter frequency.
8. display methods as claimed in claim 7, which is characterized in that the second mode is anti-mode of taking on the sly, and second frequency
Rate is different from the multiple of the image capture unit shutter frequency.
9. display methods as claimed in claim 7, which is characterized in that the duty cycle of the backlight is in default duty cycle range
Interior variation or the second frequency within the scope of predeterminated frequency in changing.
10. display methods as claimed in claim 7, which is characterized in that the display unit has multiple display areas, multiple
Display area receives the backlight with different frequency respectively and shows picture with different frequency.
11. display methods as claimed in claim 7, which is characterized in that the display unit has the first display area and second
Display area, which operates on the first mode and second display area operates on the second mode.
12. display methods as claimed in claim 7, which is characterized in that, should when the display device operates on the second mode
The frequency of backlight is that the second frequency replaces with the periodicity of third frequency or aperiodicity replaces, and the third frequency is different from
The image capture unit shutter frequency.
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| CN112261395A (en) * | 2020-10-22 | 2021-01-22 | Nsi产品(香港)有限公司 | Image replacement method and device, intelligent terminal and storage medium |
| CN112261395B (en) * | 2020-10-22 | 2022-08-16 | Nsi产品(香港)有限公司 | Image replacement method and device, intelligent terminal and storage medium |
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Application publication date: 20190924 |