CN1980516A - Cold-cathode fluorescent (CCFL) brightness regulating method and system - Google Patents
Cold-cathode fluorescent (CCFL) brightness regulating method and system Download PDFInfo
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- CN1980516A CN1980516A CN 200510130447 CN200510130447A CN1980516A CN 1980516 A CN1980516 A CN 1980516A CN 200510130447 CN200510130447 CN 200510130447 CN 200510130447 A CN200510130447 A CN 200510130447A CN 1980516 A CN1980516 A CN 1980516A
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Abstract
In the general input /output bus (IOB) of the liquid crystal screen (LCS), the computer executable form is applied. Several groups of the time-brightness values (TBV) of cold cathode fluorescent lamps (CCFL) are stored in IOB. First, the image quality of LCS is tested via the recent image. In case the quality is poor, the instant time value and the instant practical brightness value of LCS are tested. Then, TBVs of multi-groups of CCFL are searched. According to these TBVs, the voltage across CCFL and then the recent practical brightness are regulated. This invention prevents LCS using CCFL from decreasing the brightness due to the time passing by.
Description
Technical field
The present invention relates to a kind of luminance regulating method of display screen, relate in particular to the luminance regulating method and the system of the LCD screen of a kind of use cold cathode fluorescent lamp (CCFL).
Background technology
LCD (LCD) is light, thin, short, little with it, heat and power consumption is low and the advantage of several radiationless injuries, significantly seizes the consumer information market.Wherein rapid with Thin Film Transistor-LCD (TFT-LCD) technical progress again, and with the scale of investment and the volume production actual achievement of reality, declare the epoch of high quality displayer and arrive.But LCD is non-self luminous display, and even and enough light need be provided, for giving the liquid crystal screen intensity.The light source of LCD is from backlight, it is long that light source need possess high brightness, life-span, present light source has cold cathode fluorescent lamp (CCFL), hot cathode fluorescent lamp, electroluminescence sheet (EL), (LED) is several for light-emitting diode, cold cathode fluorescent lamp (CCFL) is maximum because of in light weight, the shared output value proportions of advantage such as little and high electro-optical efficiency that generate heat, and present business-like LCD backlight lamp 99% is a cold cathode fluorescent lamp.Be full of inert gas and micro-mercury in the cold cathode fluorescent lamp pipe, and scribble phosphor powder at the glass tube inwall, when add high voltage to the pipe two ends electrode on the time, the two poles of the earth just begin discharge, mercury can be activated because of the mutual collisions such as atom of electronics or the inert gas that charges into, send ultraviolet ray (main wavelength is 253.7nm), it is luminous that ultraviolet ray starts phosphor powder.
But there is the problem in life-span in cold cathode fluorescent lamp (CCFL), as shown in Figure 1, Fig. 1 be cold cathode fluorescent lamp (CCFL) time-the brightness relationship table of comparisons 10 as can be known, increase along with the time, the brightness meeting of cold cathode fluorescent lamp reduces thereupon, that is to say that along with the increase of service time, the brightness of LCD screen also can reduce thereupon.Suppose that original intensity is set to 400cd/m2, then using about 5,0000 hours continuously that brightness drops to 200cd/m2, is 50% of initial setting brightness value.If with the Time Calculation of opening in a day 20 hours, the brightness of display will be reduced to half (200cd/m2) and generally speaking be called the life-span and end after 6 years, be to drop to 50% o'clock the time point at initial stage with lamp brightness to be as the criterion.At this moment, because having reached the time limit in its useful life, can not continue cold cathode fluorescent lamp to use.In addition, show LCD in continuous operation after 5000 hours by Fig. 1 data, brightness drops to about 330cd/m2 from the 400cd/m2 of beginning, is reduced to 80% of original intensity after 10000 hours.Therefore, the problem that cold cathode fluorescent lamp brightness reduces in time not only influences the useful life of LCD, also can influence the quality of image of LCD screen, user by the display of cold cathode fluorescent lamp starter brings visual difference and discomfort to long-term use, even causes the injury on the eyesight.Common way is to change cold cathode fluorescent lamp or display ahead of time, thereby has reduced the utilance of display, causes certain waste.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of cold cathode fluorescent lamp (CCFL) luminance regulating method and system, disclosed cold cathode fluorescent lamp (CCFL) luminance regulating method and system are by adjusting the magnitude of voltage of cold cathode fluorescent lamp, to supply the luminance difference of LCD screen in good time, so as to avoiding owing to the time increases the problem appearance that causes brightness to reduce.
The disclosed cold cathode fluorescent lamp of the present invention (CCFL) luminance regulating method, but operate on the computer executive mode in the general input/output bus (BIOS) of a LCD screen, wherein store the time-brightness value of many group cold cathode fluorescent lamps among the BIOS, the method comprises the following steps: to capture a current image of LCD screen, and the quality of image of LCD screen is detected; If the quality of image for ungood, then detects a current intrinsic brilliance value of a current time value and LCD screen; And time-brightness values of searching many group cold cathode fluorescent lamps, and according to many group cold cathode fluorescent lamps time-brightness value adjusts the voltage of cold cathode fluorescent lamp, so that current intrinsic brilliance value is adjusted.
According to cold cathode fluorescent lamp of the present invention (CCFL) luminance regulating method,, and then obtain time-brightness values of organizing cold cathode fluorescent lamps wherein by the brightness of cold cathode fluorescent lamp in the LCD screen of the magnitude of voltage emulation different time sections of different time sections more.
In addition, the present invention also provides a kind of cold cathode fluorescent lamp (CCFL) brightness adjustment system, but operate on the computer executive mode among the BIOS of a LCD screen, store the time-brightness value of many group cold cathode fluorescent lamps among the BIOS, this system includes: a detection module, a measurement module and an adjusting module; In this, detection module is in order to the current image of acquisition LCD screen, and detects by the quality of image of current image to LCD screen.Measurement module is in order to measure a current intrinsic brilliance value of a current time value and LCD screen.Adjusting module is in order to searching the time-brightness values of many group cold cathode fluorescent lamps, and according to many group cold cathode fluorescent lamps time-brightness value adjusts the magnitude of voltage of cold cathode fluorescent lamp, so that current intrinsic brilliance value is adjusted.
The present invention can detect the LCD screen quality of using cold cathode fluorescent lamp in good time, and the time-brightness value that utilizes many group cold cathode fluorescent lamps is adjusted the magnitude of voltage of current cold cathode fluorescent lamp, its brightness is adjusted in good time, avoided using the display equipment of cold cathode fluorescent lamp backlight to increase the appearance that causes brightness to reduce phenomenon owing to the time, and then not only improved the utilance of display, also avoid user's eyesight is caused adverse effect.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 be cold cathode fluorescent lamp (CCFL) time-the brightness relationship table of comparisons;
Fig. 2 is cold cathode fluorescent lamp of the present invention (CCFL) brightness adjustment system calcspar; And
Fig. 3 is the flow chart of steps of cold cathode fluorescent lamp of the present invention (CCFL) luminance regulating method.
Wherein, Reference numeral:
10: cold cathode fluorescent lamp (CCFL) time-the brightness relationship table of comparisons
The 20:CCFL Adjustment System
22: detection module
24: adjusting module
26: measurement module
28: general input/output bus
One current image of step 101 acquisition LCD screen
The quality of image of step 102 pair LCD screen detects
Step 103 judges whether the quality of image of LCD screen is good
Step 104 is measured a current intrinsic brilliance value of current time value and LCD screen
Step 105 is searched the time-brightness value of many group cold cathode fluorescent lamps from BIOS
Step 106 is adjusted the voltage of cold cathode fluorescent lamp, so that current intrinsic brilliance value is adjusted
Embodiment
Below, will elaborate to preferred implementation of the present invention in conjunction with the accompanying drawings.
As shown in Figure 2, Fig. 2 is cold cathode fluorescent lamp of the present invention (CCFL) brightness adjustment system calcspar.As shown in the figure, brightness adjustment system 20 comprises detection module 22, adjusting module 24 and measurement module 26.At first detection module 22 captures the current image of LCD screen in a scheduled time, then institute's picked image quality is detected.Here detection module 22 can be carried out detecting operation by the current selection of user, perhaps by the software set certain time interval, for example after LCD is used 20 hours continuously, and then activates detection module 22 in the given time automatically to detect.Here, the quality of image that is detected comprises the brightness and contrast of LCD screen, and the brightness and contrast certainly also can be with the color of screen under suitable situation for influencing the key factor of the screen quality of image, and other factorses such as saturation are taken into account.Usually LCD can realize setting an optimal brightness value, and optimal brightness is the place in maximum brightness about 55%.Along with the increase of time, realize that selected optimal brightness can change.Therefore, by the quality of image of detection LCD screen, and then judge whether the brightness of LCD reduces.If detection module 22 detects the quality of image for ungood, then measurement module 26 begins to measure current time value and the current intrinsic brilliance value of LCD screen, and time value and the intrinsic brilliance value obtained sent into adjusting module 24, adjusting module 24 search are stored in the time-brightness value of the many groups cold cathode fluorescent lamp in the general input/output bus (BIOS) 28, can before dispatching from the factory, liquid crystal display product find out the corresponding relation of time and brightness by a series of experiments.Here, be by the brightness of cold cathode fluorescent lamp in the LCD screen of the magnitude of voltage emulation different time sections of different time sections.Though LCD is a digital display, but the brightness of each picture element be actually by be stored in the picture element unit analog voltage level determined, though LCD is a digital display, but the brightness of each picture element be actually by be stored in the picture element unit analog voltage level determined, and utilize three primary colors (RGB) filter before picture element to realize color, therefore here by selecting for use voltage to come the brightness of emulation cold cathode fluorescent lamp.Three primary colors (RGB) filter of utilization before picture element realized color, therefore here by selecting for use voltage to represent cold cathode fluorescent lamp brightness.Adjusting module 24 is searched among the BIOS and current time time corresponding-brightness value according to time value that receives and brightness value, adjusts the voltage of cold cathode fluorescent lamp, and then current intrinsic brilliance is adjusted.
Fig. 3 is the flow chart of steps of cold cathode fluorescent lamp of the present invention (CCFL) luminance regulating method, as shown in the figure, at first captures a current image (step 101) of LCD screen.Then, the quality of image of LCD screen to acquisition detects (step 102).At this, the quality of image of detection comprises the brightness and contrast of LCD screen.In step 103, judge that to the quality of image of LCD screen is whether good the standard of judging the display picture play quality here has brightness, the contrast of LCD screen.The brightness and contrast is to the most significant two pointers of image quality influence, and brightness too hour, and contrast will reduce, if when brightness is excessive, dark background can become very white.Contrast is high more, and image is clear more.But contrast is high to some degree, and the purity of color will go wrong.Therefore, judge the current quality of image when ungood, then detecting a current intrinsic brilliance value (step 104) of current time value and LCD screen.From BIOS, search time-brightness value (step 105) that many groups store cold cathode fluorescent lamp wherein then, the software program of carrying out search is at first browsed the many groups time-brightness value table of comparisons in the storage device that is stored in LCD in advance, by the brightness of cold cathode fluorescent lamp in the LCD screen of the magnitude of voltage emulation different time sections of different time sections, and then obtain the time-brightness values of this many group cold cathode fluorescent lamps, by the current time value of measurement and the current intrinsic brilliance value of LCD screen, adjust the voltage of cold cathode fluorescent lamp, and then current intrinsic brilliance value is adjusted (step 106).Detecting the time of the quality of image of LCD screen can set in advance, for example, promptly detects automatically after 20 hours in the display continuous operation.If detect the quality of image, then continue and measure the intrinsic brilliance value of current time value and screen for ungood.Each regional brightness of LCD screen can be controlled by electric current and the voltage of adjusting cold cathode fluorescent lamp, and for example, the time period that foundation detects drives the inverter circuit of cold cathode fluorescent lamp and controls the digital control circuit of its operation.After adding to the pattern of lighting a lamp of digital control circuit output on the inverter circuit, according to different patterns, corresponding the changing of voltage in the transformer of inverter circuit, variation is also just ensued in the brightness of cold cathode fluorescent lamp, thereby realize brightness adjustment, improve the cold cathode fluorescent lamp quality of image cold cathode fluorescent lamp.Here, above-mentioned cold cathode fluorescent lamp voltage is adjusted function and can be finished by a software program, and software program is solidificated among the BIOS, thereby can utilize time state that the brightness of LCD is detected in good time and adjusts, guarantee that LCD screen is in the preferable brightness indication range.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. cold cathode fluorescent lamp luminance regulating method, but operate on the computer executive mode in the general input/output bus of a LCD screen, store the time-brightness value of many group cold cathode fluorescent lamps in this general input/output bus, it is characterized in that this method comprises the following steps:
Capture a current image of this LCD screen, and the quality of image of this LCD screen is detected;
If this quality of image for ungood, then detects a current intrinsic brilliance value of a current time value and this LCD screen; And
Search this and organize the time-brightness values of cold cathode fluorescent lamps more, and adjust the voltage of this cold cathode fluorescent lamp more, so that this current intrinsic brilliance value is adjusted according to being somebody's turn to do time-brightness values of organizing cold cathode fluorescent lamps.
2. cold cathode fluorescent lamp luminance regulating method according to claim 1, it is characterized in that, by of the brightness of this cold cathode fluorescent lamp, and then obtain this time-brightness values of organizing cold cathode fluorescent lamps in this LCD screen of this different time sections of magnitude of voltage emulation of different time sections more.
3. cold cathode fluorescent lamp luminance regulating method according to claim 1 is characterized in that this quality of image refers to the brightness of this LCD screen.
4. cold cathode fluorescent lamp luminance regulating method according to claim 1 is characterized in that this quality of image refers to the contrast of this LCD screen.
5. cold cathode fluorescent lamp brightness adjustment system, but operate on the computer executive mode in the general input/output bus of a LCD screen, store the time-brightness value of many group cold cathode fluorescent lamps in this general input/output bus, it is characterized in that this system includes:
One detection module in order to capturing a current image of this LCD screen, and detects by the quality of image of this current image to this LCD screen;
One measurement module is in order to measure a current intrinsic brilliance value of a current time value and this LCD screen; And
One adjusting module is organized the time-brightness values of cold cathode fluorescent lamps in order to search this more, and adjusts a magnitude of voltage of this cold cathode fluorescent lamp according to being somebody's turn to do time-brightness values of organizing cold cathode fluorescent lamps more, so that this current intrinsic brilliance value is adjusted.
6. cold cathode fluorescent lamp brightness adjustment system according to claim 5, it is characterized in that, by of the brightness of this cold cathode fluorescent lamp, and then obtain this time-brightness values of organizing cold cathode fluorescent lamps in this LCD screen of this different time sections of magnitude of voltage emulation of different time sections more.
7. cold cathode fluorescent lamp brightness adjustment system according to claim 5 is characterized in that this quality of image refers to the brightness of this LCD screen.
8. cold cathode fluorescent lamp brightness adjustment system according to claim 5 is characterized in that this quality of image refers to the contrast of this LCD screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510130447 CN1980516A (en) | 2005-12-08 | 2005-12-08 | Cold-cathode fluorescent (CCFL) brightness regulating method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510130447 CN1980516A (en) | 2005-12-08 | 2005-12-08 | Cold-cathode fluorescent (CCFL) brightness regulating method and system |
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| CN1980516A true CN1980516A (en) | 2007-06-13 |
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| CN 200510130447 Pending CN1980516A (en) | 2005-12-08 | 2005-12-08 | Cold-cathode fluorescent (CCFL) brightness regulating method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307319A (en) * | 2014-05-29 | 2016-02-03 | 松下知识产权经营株式会社 | Lighting device, lighting system and control method for the lighting device |
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2005
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307319A (en) * | 2014-05-29 | 2016-02-03 | 松下知识产权经营株式会社 | Lighting device, lighting system and control method for the lighting device |
| CN105307319B (en) * | 2014-05-29 | 2017-12-15 | 松下知识产权经营株式会社 | The control method of lighting device, illuminator and lighting device |
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Open date: 20070613 |