CN1614680A - Brightness stablizing device of liquid-crystal displaying device and its controlling method - Google Patents
Brightness stablizing device of liquid-crystal displaying device and its controlling method Download PDFInfo
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- CN1614680A CN1614680A CN 200310105003 CN200310105003A CN1614680A CN 1614680 A CN1614680 A CN 1614680A CN 200310105003 CN200310105003 CN 200310105003 CN 200310105003 A CN200310105003 A CN 200310105003A CN 1614680 A CN1614680 A CN 1614680A
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Abstract
A method for making liquid crystal display brightness stabilized includes setting optical transducer on liquid crystal display panel of liquid crystal display, using the optical transducer to detect current picture brightness and to convert it to be electrical signal, then comparing the signal with initially set value of brightness for adjusting the brightness to be optimum.
Description
Technical field
The present invention relates to a kind ofly in LCD, picture brightness is carried out the LCD brightness stabilization device and the control method of even stabilization according to the inner setting value.
Background technology
Usually, LCD is to utilize the electricity of the liquid crystal with liquid and the middle character of solid, the display device of optical property, the medical LCD of using for the specific purposes of reading X ray is therein, and the radioscopic image of having an X-rayed human body is shown the display device of reading on display.
As above-mentioned existing medical LCD,, become most significant problems according to the picture brightness of lamp source for meeting its purpose (correctly reading of radioscopic image); But for the situation of above-mentioned existing medical display, As time goes on picture brightness becomes inhomogeneously, and the brightness of its bias light little by little reduces; This situation not only reading of radioscopic image becomes difficulty, and essential frequent alternately lamp source.
General LCD constitutes as shown in Figure 1, and it is to be made of following structure: the video decoder 102 that the audiovisual AV signal that receives is deciphered; With the horizontal-drive signal (H-Sync) that receives and R, G, B (red, green, blue) conversion of signals is the analog-digital converter ADC101 that exports after 8 bit digital signal; With the audiovisual AV signal and above-mentioned 8 bit digital signal of in analog-digital converter ADC, changing of above-mentioned decoding, the digital video processor of changing with the form that is suitable for LCD panel 109 103; Receive the input signal of having handled from above-mentioned digital video processor, the display part 111 that shows with respective image; Control the control part 122 of above-mentioned digital video processor 103 and above-mentioned display part 111.
Above-mentioned display part 111 is to be made of following structure: the phase inverter 106 that the bias light drive current is provided according to the order that receives from control part 122; First lamp source 107, second lamp source 108 that drive corresponding to the brightness of above-mentioned phase inverter 106 drive currents; The LCD panel 109 that the signal of importing from above-mentioned digital video processor 103 shows.
Above-mentioned control part 122 is to be made of following structure: control above-mentioned digital video processor 103, and control the microprocessor 104 that lamp source drive by above-mentioned phase inverter 106; The storer 105 of storage control desired data.
With reference to Fig. 1 general LCD operating principle is described as follows.Analog-digital converter ADC (101) is that the basis is converted to digital signal with the RGB rgb signal of input with horizontal-drive signal (H-Sync); Switched digital red, green, blue R, G, B signal are input to the port A (Port A) of digital video processor 103.After deciphering, the vision signal that video decoder 102 will have been imported is input to the port B (Port B) of digital video processor 103.Digital video processor 103 will be supplied with display part 111 from digital red, green, blue R, the G of 101 inputs of above-mentioned analog-digital converter, B signal or after the vision signal of video decoder 102 inputs converts (Scaling) and signal Processing.
On the other hand, the microprocessor 104 of control part 122 when controlling the processing signals of above-mentioned digital video processor 103, is controlled the driving of display part 111 with reference to the storer 105 of storage control desired data.
The picture signal that above-mentioned display part 111 is supplied with according to digital video processor 103 drives LCD panel 109 and shows respective image; And receive the control of microprocessor 104 again, drive bias lights with first lamp source 107, second lamp source 108 by phase inverter 106, thereby demonstration has the image of desired brightness.
At this moment, picture brightness will flow into first lamp source 107, second lamp source 108 from the drive current that phase inverter 106 produces and obtain, but its brilliance control is adjusted with the drive current method of conversion phase inverter 106 in microprocessor 104.
But the maximum drive current of above-mentioned phase inverter 106 has the fixed value that is suitable for first lamp source 107, second lamp source, 108 kinds and sets.
That is, according to the kind of first lamp source 107, second lamp source 108, the brightness value picture brightness that such first lamp source 107, second lamp source 108 can produce is set at prior specified value; Be suitable for this driving current value and also be set at fixed value according to phase inverter 106.If set like this, then according to life-span of first lamp source 107, second lamp source 108, As time goes on picture brightness deepening gradually.
Usually, the life-span of first lamp source 107, second lamp source 108 for to the beginning brightness 50% till, though variant because of fabricator's level difference, approximately be decided to be about 30,000 hours.But if the situation of the medical monochrome liquid crystal display of using for the specific use of reading X ray, then picture brightness becomes extremely important project.This is because what show is image for diagnosis, and is that the picture brightness of diagnosis relates to the cause that diagnostic result is had significant impact.
And, in medical monochrome liquid crystal display LCD, as above-mentioned, if As time goes on cause that because of the lamp source performance reduces picture brightness also reduces, then can't guarantee reliability, propose the problem that in very short time, lamp source to be replaced thus the radioscopic image of diagnosis usefulness.
That is, traditional medical LCD LCD is as above-mentioned, because the liquid crystal characteristic of lamp source and liquid crystal display LCD plate, so there is its brightness passing in time problem inhomogeneous and that reduce gradually that becomes; When the user uses for reading X ray, read X ray and become difficulty because of picture brightness reduces to produce, and, the trouble that causes because of the frequent substitution of lamp source and because of cause the problem that expense is big with frequent substitution.
Summary of the invention
The present invention provides a kind of brightness stabilization device of LCD and control method as purpose in order to solve the problems of the technologies described above, it can detect the picture brightness according to the bias light of LCD; According to the result that the picture brightness that has detected is compared with the brightness of setting, the variation of control lamp source drive current; Can often keep homogeneity and certain brightness thus.
Another object of the present invention is to adhere to optical sensor on the LCD panel of medical LCD, and the picture brightness that utilizes this optical sensor detection is judged current picture brightness as the basis.If current picture brightness does not have the brightness of setting bright, it is brighter then to control current brightness; If current picture brightness is also brighter than setting brightness, then control current brightness deepening; Make LCD keep uniform luminance for a long time by above-mentioned control.
Another purpose of the present invention is with LCD panel liquid crystal and bias light characteristic, reduces the trouble that causes user's frequent substitution lamp source because of the reduction of passing its brightness in time, can also prevent to replace the big problem of expense that causes because of lamp source.
Be the LCD brightness stabilization device of the present invention that achieves the above object, it is characterized in that it is made up of following part: the optical detection part that detects current picture brightness according to the bias light of LCD; The comparing section that the reference value of setting in current picture brightness that is detected by above-mentioned optical detection part and the machine compares; Comparative result with above-mentioned comparing section is input, reaches the reference value of setting for making current picture brightness, and controls the control part of bias light drive current.
And, in the brightness stabilization device of LCD of the present invention, it is characterized in that above-mentioned optical detection part has following structure: optical sensor is set at the LCD panel rear; With the picture brightness conversion of signals of light sensors is the signal converter of electric signal.
And, in LCD brightness stabilization device of the present invention, it is characterized in that the difference signal that above-mentioned comparing section will be obtained between the reference value of current picture brightness detection signal and setting is input to control part.
And, in LCD brightness stabilization device of the present invention, it is characterized in that above-mentioned control part will be corresponding to the bias light driving current value of picture brightness, be stored in the storer with form in advance, and, control the bias light drive current of above-mentioned current picture brightness with reference to the data of this storer.
And, be the LCD brightness stabilization control method of the present invention that achieves the above object, it is characterized in that it is made up of the following stage: from detection-phase attached to the current picture brightness of light sensors of LCD panel; The comparison phase that the reference value of setting in above-mentioned current picture brightness that has detected and the machine compares; According to the comparative result of the reference value of setting in above-mentioned current picture brightness value and the machine, for making current picture brightness corresponding to reference value, the adjusting stage that the bias light driving current value is regulated.
Advantageous effect of the present invention; Medical LCD is read the device of radioscopic image signal of perspective human body as demonstration, for the picture brightness that accords with the above-mentioned purpose lamp source becomes most significant problems.
Optical sensor adheres in LCD panel central authorities in the medical LCD of the present invention, by the current picture brightness of light sensors; And compare with brightness value that the back is judged and control brightness by its adaptability setting; Therefore not only can be normally show with the image of brightness equably with hope, and, limit the rising of keeping maintenance cost in the conventional art that causes with the lamp source frequent substitution because of prolonging bias light period with the lamp source replacement, thereby obtain the effect of reducing expenses, and also obtain removing effect with frequently changing the user's trouble that causes for lamp source.
Description of drawings
Fig. 1 is that traditional general LCD constitutes block scheme.
Fig. 2 is the formation skeleton diagram of LCD panel of the present invention.
Fig. 3 is the brightness stabilization device calcspar of LCD of the present invention.
Fig. 4 is the process flow diagram of LCD brightness stabilization control method of the present invention.
Among the figure: 102: video decoder; 104: microprocessor; 103: digital video processor; 105: storer; 106,390: phase inverter; 107,108,220,230,320,330: lamp source; 109,210,310: LCD panel; 240,340: the hole; 350: optical sensor.
Embodiment
Fig. 2 adheres to the optical sensor instance graph on the LCD panel of LCD of the present invention.As shown in Figure 2, in back cover (REAR FRAME) central bore 240 of LCD panel 210, and portion adheres to optical sensor and detects current LCD picture brightness by background light light source (220,230) within it.
Fig. 3 is expression LCD stabilization device example block of the present invention, and it is to be made of following structure: the holes 340 that form attached to above-mentioned LCD panel 310 central authorities, and detect the optical sensor 350 of current picture brightness; The current picture detection signal of above-mentioned optical sensor 350 detections is converted to the signal converter 360 of electric signal; From the current picture brightness information of above-mentioned signal converter 360 inputs be suitable for the comparer 370 that the corresponding inverter drive current reference of picture brightness value that above-mentioned lamp source (320,330) kind begins to set compares; The comparative result that receives above-mentioned comparer 370 inputs is judged current picture brightness, and keeps the microprocessor 380 that appropriate brightness is controlled above-mentioned phase inverter 390 according to judgment value; Receive driving that above-mentioned microprocessor 380 controls lamp source (320,330) also stream maintain the above-mentioned appropriate brightness that begins to set and the phase inverter 390 that is provided with; According to above-mentioned phase inverter 390 and the drive current of variable adjustment, drive bias light with lamp source (320,330) with the brightness of above-mentioned setting; Store the storer 300 of above-mentioned microprocessor 380 control desired datas.
On the other hand, Fig. 4 for expression according in the present invention with the brightness stabilization device of above-mentioned formation and the process flow diagram of control method, describe as follows with reference to Fig. 3 and Fig. 4 to the operating principle of brightness stabilization control method of the present invention.
At first, if the LCD action, then optical sensor 350 detects the current current brightness value of display picture brightness (S0 stage) according to bias light.
The above-mentioned light signal that has detected is converted to electric signal (S1 stage) in signal converter 360.
Value of electrical signals according to conversion in the above-mentioned signal converter 360 is exactly the value of electrical signals that is equivalent to current picture brightness.This signal value according to the kind of when beginning lamp source (320,330) and the purpose of display, compares in comparer 370 with the reference value of setting, and the reference value of setting when judging current brightness value and beginning whether identical (S2 stage).
In above-mentioned (S2 stage), if it is identical to be judged as the reference value that current brightness value and when beginning set, then optical sensor 350 detect current picture brightness again and the process that compares (S0, S1 S2) carry out or little repeatedly.
But, if it is inequality to be judged as the reference value of current brightness value and setting, reference value and the current brightness value of relatively setting then, and judge which value (S3) greatly.
This judgement is to carry out in comparer 370, carries out the corresponding reference value of picture brightness of corresponding value of electrical signals of current picture brightness and setting is compared each other, and its comparison result value is input in the microprocessor 380.And symbol (+,-) and the size of judging its fiducial value in this microprocessor 380 are obtained.
In the above-mentioned stage (S3), if the suitable reference value of current brightness value and setting relatively is judged as greatly, then in microprocessor 380, be fit to the formation that brightness drives for disposing, the drive current that changes lamp source (320,330) by above-mentioned phase inverter 390 reduces brightness (S4, S6 stage).If the suitable reference value of setting value relatively is judged as little when current brightness value and beginning, then in microprocessor 380, be fit to the formation that brightness drives, change lamp source (320 by phase inverter 390 for disposing, 330) drive current improves brightness (S5, S6 stage).At this moment, microprocessor 380 will be corresponding to the bias light driving current value of picture brightness, in advance with form stores in the lattice storer, and, carry out control to above-mentioned current picture brightness bias light drive current with reference to this storer form.
And, the brightness value that the method that utilization illustrates is till now adjusted again drives lamp source (320,330), so not only current LCD picture brightness, the reference value that is fit to that is provided with in the time of can normally evenly keeping beginning, and corresponding display image shows with the optimal brightness state.
600cd/m when for example, the brightness of the liquid crystal display device module of setting during beginning is 7mA for the lamp source electric current
2If with 550cd/m
2Set suitable brightness, then keep 550cd/m at the beginning initial stage
2If picture brightness descends,, use electric current to come stabilization brightness as above-mentioned stage control break phase inverter 390 then according to the formation of the invention described above.
Claims (5)
1, LCD brightness stabilization device is characterized in that it is made up of following part: the optical detection part that detects current picture brightness according to the bias light of LCD; The comparing section that the reference value of setting in current picture brightness that is detected by above-mentioned optical detection part and the machine compares; Comparative result with above-mentioned comparing section is input, reaches the reference value of setting for making current picture brightness, and controls the control part of bias light drive current.
2, the brightness stabilization device of LCD according to claim 1 is characterized in that above-mentioned optical detection part has following structure: at the LCD panel rear optical sensor is set; With the picture brightness conversion of signals of light sensors is the signal converter of electric signal.
3, the brightness stabilization device of LCD according to claim 1 is characterized in that above-mentioned comparing section will obtain current picture brightness detection signal and set the signal difference of reference value, is input to control part.
4, the brightness stabilization device of LCD according to claim 1, it is characterized in that above-mentioned control part, will be corresponding to the bias light driving current value of picture brightness, be stored in the storer with form in advance, and, carry out above-mentioned bias light drive current according to current picture brightness with reference to the data of this storer.
5, LCD brightness stabilization control method is characterized in that it is made up of the following stage: from the detection-phase attached to the current picture brightness of light sensors of LCD panel; The comparison phase that the reference value of setting in above-mentioned current picture brightness that has detected and the machine compares; According to the comparative result of the reference value of setting in above-mentioned current picture brightness value and the machine, for making current picture brightness corresponding to reference value, the adjusting stage that the bias light driving current value is regulated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310105003 CN1614680A (en) | 2003-11-04 | 2003-11-04 | Brightness stablizing device of liquid-crystal displaying device and its controlling method |
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| CN 200310105003 CN1614680A (en) | 2003-11-04 | 2003-11-04 | Brightness stablizing device of liquid-crystal displaying device and its controlling method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433126C (en) * | 2005-09-06 | 2008-11-12 | 台达电子工业股份有限公司 | Display device and method capable of reinforcing image comparison |
| CN101719363A (en) * | 2009-11-23 | 2010-06-02 | 康佳集团股份有限公司 | Luminance uniformity adjusting method and system of displayer |
| US8040341B2 (en) | 2004-01-09 | 2011-10-18 | O2Micro Inc | Brightness control system |
| CN104681007A (en) * | 2015-03-16 | 2015-06-03 | 南京巨鲨显示科技有限公司 | Working method of real-time multi-order brightness stabilization system |
-
2003
- 2003-11-04 CN CN 200310105003 patent/CN1614680A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8040341B2 (en) | 2004-01-09 | 2011-10-18 | O2Micro Inc | Brightness control system |
| CN100433126C (en) * | 2005-09-06 | 2008-11-12 | 台达电子工业股份有限公司 | Display device and method capable of reinforcing image comparison |
| CN101719363A (en) * | 2009-11-23 | 2010-06-02 | 康佳集团股份有限公司 | Luminance uniformity adjusting method and system of displayer |
| CN104681007A (en) * | 2015-03-16 | 2015-06-03 | 南京巨鲨显示科技有限公司 | Working method of real-time multi-order brightness stabilization system |
| CN104681007B (en) * | 2015-03-16 | 2018-05-01 | 南京巨鲨显示科技有限公司 | A kind of method of work of the multistage brightness stability system of real-time |
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