CN101299807A - Display device capable of automatically regulating display parameter as well as implementation method thereof - Google Patents
Display device capable of automatically regulating display parameter as well as implementation method thereof Download PDFInfo
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Abstract
The invention provides a display device for automatically adjusting the display parameters and an in implement method thereof, including: a. the display device acquires the distance between the display device audience and the display device; b. the display device MCU adjusts the display parameters of the display device according to the distance information. The distance is detected by a detection module between the audience and the display device, then is input to the display device MCU; then MCU judges the distance between the audience and the display device according to the distance, and automatically adjusts the display parameters of the display device, to cause the display device automatically to adjust the display parameters according to the watching distance, and provide the audience with proper display effect with gentle clue display, which ensures the users to water in a proper distance, to protect the eyes and be favor of the health.
Description
Technical field
The invention belongs to the Display Technique field, relate in particular to the technology that display device brightness is adjusted.
Background technology
The television display part has carried out the transition to flat-panel display devices such as liquid crystal, plasma gradually from traditional CRT monitor, the size of display device also constantly increases, the user is when TV reception, and the distance (to call viewing distance in the following text) between television set and the user more and more needs the problem be concerned about with regard to having become.
Problem at viewing distance, one of solution of the prior art is that a distance alarm control circuit is installed in television set, cross when near when spectators' viewing distance and just to report to the police automatically, control volume and interfering picture reach the purpose that allows spectators teleview thus in suitable scope; Two of solution of the prior art be by form by transducer, interface circuit apart from monitoring device, and be connected with the input/outlet of television set CPU, when the distance between spectators and television set during less than setting range, the captions prompting will appear on the screen of TV.Cross at the user distance television set in essence when these technical schemes and to provide alarm prompt when near.
In addition, the brightness of video screen and watching distance also have very big influence to spectators' health.Usually, television set can differ greatly for the luminance parameter that the user selects, and has entirely from 300-1000nit.Brightness is higher can to produce dazzling sensation, even the eyes of burning, and low excessively brightness eyes must high concentration, and as easy as rolling off a log fatigue is used the easier trouble myopia of product of low-light level for a long time.Light intensity in the propagation can weaken along with distance, and the energy of general TV mainly is to spread in the 160 degree scopes up and down, and the theoretical light intensity that requires to propagate into human eye is preferably between the 85-110nit, and this is a desired quantity that guarantees vision health.Usually viewing distance that can reference is about one of two percentages of television screen brightness.
It is adjustable that the luminance parameter value of existing television set is set to the user, as mentioned above, when viewing distance not simultaneously, the screen intensity that the most suitable human eye is watched is also different, the manual adjustment screen intensity will be too loaded down with trivial details when the user changed at viewing distance, therefore, if allow screen intensity along with the automatic adjustment of viewing distance just becomes the technical issues that need to address.Except brightness value, other the parameter value that influences view reception effect as contrast, definition etc., also needs spectators manually to adjust at spectators' viewing distance not simultaneously, can't realize automatic adjustment.
Except television set, same problem exists in other display device too.
Summary of the invention
The object of the present invention is to provide display device and its implementation of a kind of automatic adjustment display brightness, the display brightness that is intended to solve the display device that exists in the prior art can not be according to the self-adjusting problem of spectators' viewing distance.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of display device is adjusted the method for display parameters automatically, and described method comprises the steps:
A, display device obtain the range information between display device spectators and the described display device;
B, described display device MCU adjust the display parameters of described display device according to described distance.
Wherein step a specifically comprises:
A1, described display device detect the infrared signal that described display device spectators send;
A2, described display device are sampled after detected infrared signal is handled, and obtain sampled value.
Wherein step b specifically comprises:
B1, described display device MCU compare described sampled value and predefined higher limit and lower limit, if described sampled value is greater than described higher limit, described MCU judges that the described display device of described display device spectators distance is near excessively, described MCU turns down described display parameters, if described sampled value is less than described lower limit, described MCU judges that the described display device of described display device spectators distance is far away excessively, and described MCU heightens described display parameters.
Wherein step b also comprises: described display device is near excessively if described MCU judges described display device spectators distance, and described MCU calls the OSD menu and shows, reminds the described display device of described display device spectators distance near excessively.
Described display device is a television set.
Described display parameters are specially screen intensity or contrast or definition.
The backlight illumination magnitude of voltage that is specially described display device is turned down/heightened to the display brightness of described display device to be turned down/heightens.
The present invention also provides a kind of display device of automatic adjustment display brightness, comprises display device, and described display device also comprises detection module and MCU, wherein:
Described detection module is used for detecting the range information of display device spectators and described display device;
Described MCU links to each other with described detection module, is used for receiving the range information of described detection module input, and adjusts the display parameters of described display device according to described range information.
Described detection module is specially pyroelectric sensing probe PIR, is used for detecting the infrared signal that described display device spectators send.
Described MCU is used for the infrared signal of described PIR input is sampled, compare with predefined higher limit and lower limit after obtaining sampled value, if described sampled value is greater than described higher limit, described MCU is used for the display parameters of described display device are turned down, if described sampled value is less than described lower limit, described MCU is used for the display parameters of described display device are heightened.
Described display parameters are specially screen intensity or contrast or definition.
The present invention overcomes the deficiencies in the prior art; employing detects distance between spectators and the display device by detection module; input to display device MCU; MCU judges the distance of display device spectators distance display equipment according to distance; the automatic then technical scheme that the display parameters of display device are adjusted; make display device adjust its display parameters automatically according to viewing distance; to offer the display effect that spectators suit; and there is the warm tip language to show; guarantee that the user watches under suitable distance; the protection eyes, good for health.
Description of drawings
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is an embodiment of the invention circuit structure diagram;
Fig. 3 is an embodiment of the invention flow chart;
Fig. 4 is another embodiment of the present invention circuit structure diagram.
Embodiment
In the technical scheme provided by the invention, detect distance between spectators and the display device by detection module, input to display device MCU, MCU adjusts the display parameters of display device then automatically according to the distance of distance judgement display device spectators distance display equipment.
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment of the invention, display device is that example describes with the television set, and other display device as monitor, DVD display device etc., also can be used technical scheme provided by the invention, and its principle is identical.
See also Fig. 1, it is a principle of the invention block diagram, specifically comprise detection module, signal processing module, MCU and display device, wherein, detection module is connected with signal processing module, the infrared signal transmission that detected televiewer is sent arrives signal processing module, signal processing module is transferred to MCU after signal is handled, MCU compares sampled signal and predefined higher limit with following restriction, it is far still near excessively to judge that the televiewer crosses apart from television set, adjusts the backlight illumination of display device then according to judged result.
See also Fig. 2, in the present embodiment, detection module adopts pyroelectric sensing probe PIR, signal processing circuit comprises current rectifying and wave filtering circuit and amplifying circuit, and wherein, pyroelectric sensing probe PIR is used for the infrared signal that human body sends, enter the detection range of PIR as the people, PIR will detect the faint infrared signal of human body, gives current rectifying and wave filtering circuit, inputs to television set microprocessor MCU again after amplifying.MCU does bright dark control backlight by PWM2 (pulse-width modulation) to display screen after to input-signal judging.
During specific implementation, can control the PWM1 control circuit by MCU, MCU changes PIR supply power voltage (also being to change the electric current that PIR provides) the control of the duty ratio of PIR supply power voltage by PMW1, make distance that PIR detects proportional and change along with supply current, concrete numerical value can be according to the size of television set, and the spacious degree in room of living in and deciding, that is to say, by the adjustment of PIR supply power voltage duty ratio being adjusted the infrared signal that PIR can detected human body sends.PIR detects after the infrared ray that TV reception sends, through shaping filter and amplification, by ADC (analog/digital converter) the pin input signal of MCU, MCU reads the ADC sampled value in real time then, and the spectators that accurate judgement televiews are apart from the distance of television screen.(higher limit and lower limit depend primarily on the factor of the size of TV to MCU with the sampled value obtained and predefined higher limit and lower limit, such as screen size 27 cun TV household which owns machines for production, it is 8 meters that spectators normally watch the ultimate range of this TV, require the brightness maximum when 7 meters of this spectators distances, these 7 meters is exactly higher limit; When requiring simultaneously in 2 meters or 2 meters, to see TV; requirement brightness is minimum or brightness is suitable; at this moment 2 meters is exactly lower limit .) compare; if surpass higher limit, illustrate that the spectators that teleview are too near apart from screen, then MCU will regulate the backlight illumination control level by PWM2; reduce screen intensity; and demonstration warm tip language, " the protection eyes please keep certain distance! " etc.; If sampled value surpasses higher limit, compare with lower limit, if be lower than lower limit, illustrate that the people who televiews is too far away apart from screen, then MCU will regulate the backlight illumination control level by PWM, the suitable screen intensity of heightening.
See also Fig. 3, the workflow of the described automatic adjustment display brightness television set of the embodiment of the invention specifically comprises following step:
1, start television set " intelligence is adjusted function ", display screen is in the display brightness value under the default general mode.
2, PIR detects the infrared signal that the televiewer sends, and outputs to MCU with the detection signal shaping filter and after amplifying.
3, MCU reads the sampled value of ADC in real time, and compares with predefined higher limit and lower limit, if sampled value surpasses higher limit, illustrates that the spectators that teleview are too near apart from screen, changes step 6, otherwise changes step 4.
If 4 sampled values do not surpass higher limit, compare with lower limit, if be lower than lower limit, illustrate that the spectators that teleview are too far away apart from screen, then MCU will regulate the backlight illumination control level by PWM, changes step 5, otherwise changes step 2.
5, MCU heightens the backlight illumination control level of display device, improves display brightness.
6, MCU regulates the backlight illumination control level, reduces screen intensity, and shows the warm tip language, and " the protection eyes please keep certain distance! " etc.
After MCU obtained sampled value, the adjusting of finishing the television set display brightness according to sampled value specifically can realize by following algorithm:
(a): according to the people who televiews of real-time detection distance, utilize formula, realize the dynamic adjustments backlight illumination apart from screen.
V=(3.3v or 5v/D) * Y
Wherein, the meaning of each parameter representative is as follows:
V: control backlight illumination voltage;
3.3v or 5v:, select to regulate the maximum voltage value of backlight illumination according to Backlight Inverter ON/OFF Control Voltage requirement; Common backlight control level 0～3.3v/5v, wherein the 0v backlight illumination is minimum, and 3.3v or 5V backlight illumination are the highest, and the screen that also has is by reverse level control backlight illumination;
D: the maximum distance (at the television setting D=6m below 20 cun, the television setting more than 20 cun is 8m such as size) of monitoring when the backlight illumination of setting according to TV size and room area is the brightest;
Y: detect the distance of spectators apart from screen.
For example screen size is 32 cun a television set, and the backlight control voltage max is 5v, and its adjusting range is 0～5v.If buying and normally watching the ultimate range of this TV in this television set client's the room is 8 meters, so be the D=8m. 5V/8m=0.625V/m in the following formula, illustrate that these spectators are near video screen 1m, PIR reduces television set backlight control voltage 0.625V after detecting this signal automatically, if these spectators are 4 meters in screen the place ahead, the control voltage of current backlight is V=0.625V * 4m=(5V/8m) * 4m=2.5v, change the distance of half near screen, this moment, backlight illumination also reduced half, advantage by above-mentioned method adjustment is dynamically to change backlight illumination, and highly sensitive, shortcoming is to cause screen flicker easily.
(b):, adopt the automatic adjusting (seeing the following form) that realizes backlight illumination apart from the segmentation look-up table according to the people of real-time detection distance apart from screen.
Advantage apart from the segmentation look-up table is to cause the television image flicker, and the backlight control effect is obvious.
After detecting the distance of televiewer apart from video screen, as 2-4m, MCU is adjusted into 1.1V/1.5V (control of forward level) with forward TV backlight illumination magnitude of voltage, perhaps 1.5V/2.5V, (oppositely level control)
In the above-mentioned scheme, the supply power voltage of PIR is realized by PMW1 control power supply circuits, MCU changes PIR supply power voltage (also being to change the electric current that PIR provides) the control of the duty ratio of PIR supply power voltage by PMW1, make distance that PIR detects proportional and change along with supply current, during specific implementation, can adopt circuit as shown in Figure 3, only need provide a fixing voltage to PIR, is that warning value is (such as 3.5 meters of 37 cun TV warning distances by adjusting current parameters detecting fixed distance, 32 cun TV warnings are apart from 2.5 meters, 20 cun TV warnings are apart from 1.5 meters ...) get final product, if PIR detects the infrared ray that the televiewer sends, PIR gives MCU by universal input/output interface (GPIO) or outer interrupt pin input signal, MCU judges that spectators are too near apart from television set, display brightness is turned down suitable value, and this method is useful especially to the health of eyes as the computer monitor time spent TV.
Except adjusting backlight illumination, other display effect parameter, also can adjust as parameters such as contrast, definition by the present invention program, the process that realizes is the same substantially with the process of above-mentioned adjustment screen intensity, detected after the distance of spectators apart from television screen by PIR, MCU adjusts parameters such as contrast, definition according to the distance value that detects, for the person of ordinary skill of the art, can contrast realization according to the above embodiments, this does not give unnecessary details.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of display device is adjusted the method for display parameters automatically, it is characterized in that, described method comprises the steps:
A, display device obtain the range information between display device spectators and the described display device;
B, described display device MCU adjust the display parameters of described display device according to described range information.
2, method according to claim 1 is characterized in that, wherein step a specifically comprises:
A1, described display device detect the infrared signal that described display device spectators send;
A2, described display device are sampled after detected infrared signal is handled, and obtain sampled value.
Wherein step b specifically comprises:
B1, described display device MCU compare described sampled value and predefined higher limit and lower limit, if described sampled value is greater than described higher limit, described MCU judges that the described display device of described display device spectators distance is near excessively, described MCU turns down described display parameters, if described sampled value is less than described lower limit, described MCU judges that the described display device of described display device spectators distance is far away excessively, and described MCU heightens described display parameters.
3, method according to claim 1, it is characterized in that, wherein step b also comprises: described display device is near excessively if described MCU judges described display device spectators distance, described MCU calls the OSD menu and shows, reminds the described display device of described display device spectators distance near excessively.
4, method according to claim 1 is characterized in that, described display device is a television set.
5, method according to claim 1 is characterized in that, described display parameters are specially screen intensity or contrast or definition.
6, method according to claim 5 is characterized in that, the backlight illumination magnitude of voltage that is specially described display device is turned down/heightened to the display brightness of described display device turn down/heighten.
7, a kind of display device of automatic adjustment display brightness comprises display device, it is characterized in that, described display device also comprises detection module and MCU, wherein:
Described detection module is used for detecting the range information of display device spectators and described display device;
Described MCU links to each other with described detection module, is used for receiving the range information of described detection module input, and adjusts the display parameters of described display device according to described range information.
8, display device according to claim 7 is characterized in that, described detection module is specially pyroelectric sensing probe PIR, is used for detecting the infrared signal that described display device spectators send.
9, display device according to claim 8, it is characterized in that, described MCU is used for the infrared signal of described PIR input is sampled, compare with predefined higher limit and lower limit after obtaining sampled value, if described sampled value is greater than described higher limit, described MCU is used for the display parameters of described display device are turned down, if described sampled value less than described lower limit, described MCU is used for the display parameters of described display device are heightened.
10, display device according to claim 7 is characterized in that, described display parameters are specially screen intensity or contrast or definition.
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