CN100544540C - Lamp tube service life extension fixture and method - Google Patents
Lamp tube service life extension fixture and method Download PDFInfo
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- CN100544540C CN100544540C CNB2004100280795A CN200410028079A CN100544540C CN 100544540 C CN100544540 C CN 100544540C CN B2004100280795 A CNB2004100280795 A CN B2004100280795A CN 200410028079 A CN200410028079 A CN 200410028079A CN 100544540 C CN100544540 C CN 100544540C
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- brightness
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- scale controller
- fluorescent tube
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
A kind of device and method that prolongs lamp tube service life among the LCD, it reduces the brightness of fluorescent tube stage by stage.This device comprises a picture signal output unit, a scale controller (Scaler), a mini program controlling unit (MCU), a transducer (Inverter) and a fluorescent tube.Wherein MCU comprises a CPU (CPU), a timer and a memory again.Picture signal output unit output image signal; Scaler receives picture signal; Have or not the picture signal input among the MCU detecting real-time Scaler; If no picture signal input among the Scaler, MCU starts the duration (T) that timer record does not have the picture signal input; CPU is duration (T) and the Preset Time that is stored in the memory relatively, and to transmit control signal to Scaler, control Scaler generates the PWM ripple of the corresponding duty ratio of tool, thereby keeps the current brightness of fluorescent tube or lighting tube brightness is dropped to corresponding default brightness.Utilize the present invention can realize reducing stage by stage the lamp tube ends electric current, reduce because the sudden change of electric current causes coming off of phosphor powder on the lamp tube wall, thus the life-span of prolonging lamp tube.
Description
[technical field]
The present invention relates to a kind of device and method of prolonging lamp tube service life, particularly relate to the device and method of background light tube lifetime among a kind of LCD of prolongation.
[background technology]
As everyone knows, the graphic element of LCD is made of numerous also non-luminous liquid crystals own, and mainly by its backlight assembly decision, light source is provided by the highlighted fluorescent tube (as cold-cathode tube) in the backlight assembly in the brightness of LCD.Because highlighted fluorescent tube is the part that consumes gradually, illumination long-time, high brightness can be quickened it and wear out, and the aging of fluorescent tube can cause the liquid crystal display equipment screen jaundice.For avoiding aging jaundice even the dark that causes liquid crystal display equipment screen owing to fluorescent tube, useful life of prolonging lamp tube as far as possible, the user generally selects lighting tube brightness turned down or close fluorescent tube under needs situation away from keyboard.The computer of band LCD all allows the user that the loss that the short screen shut-in time reduces fluorescent tube is set in power management at present.Some is with the computer of LCD even also is provided with shortcut more easily, and the user only need get final product the quick closedown fluorescent tube by shortcut.
Yet the quick closedown fluorescent tube also can be facilitated the loss of fluorescent tube.Lighting tube brightness changes too greatly, and the electric current that is added on lamp tube ends sharply changes in a short period of time, can facilitate coming off of phosphor powder on the lamp tube wall, thereby quicken the aging of fluorescent tube.
So a kind of lamp tube service life extension fixture need be provided, it can reduce the brightness of fluorescent tube stage by stage, promptly stage by stage the electric current of lamp tube ends is reduced, reduce because the sudden change of electric current causes coming off of phosphor powder on the lamp tube wall, thus the life-span of prolonging lamp tube.
[summary of the invention]
Therefore, at the existing deficiency of prior art, main purpose of the present invention is to provide a kind of lamp tube service life extension fixture and method, and it can reduce lighting tube brightness stage by stage, avoid each lighting tube brightness to change too greatly, the lamp tube ends electric current sharply changes and causes the loss of fluorescent tube.
The invention provides a kind of lamp tube service life extension fixture, it comprises: a picture signal output unit, a scale controller (Scaler), a transducer (Inverter), a mini program controlling unit (MCU), an and fluorescent tube.Wherein the picture signal output unit is used for output image signal.Scaler is used for size, convergent-divergent, contrast, the brightness of control chart picture, and the picture signal that is used to receive the output of picture signal output unit, accept the control of MCU, generate pulse-width modulation (the Pulse-Width Modulation of tool different duty, PWM) ripple, and pass through the variation that this PWM ripple is controlled lighting tube brightness.MCU is used for detecting the input condition of Scaler picture signal, it comprises a CPU (Center Processing Unit, CPU), a timer, an and memory, wherein timer is used for writing down the duration (T) that the no picture signal of each Scaler is imported; Memory is used to store a plurality of Preset Times (T1, T2......Tn) and a plurality of default percentage (X1%, X2%......Xn%), and wherein a plurality of default percentages (X1%, X2%......Xn%) account for the percentage of this fluorescent tube normal brightness for the brightness of lighting tube brightness after descending; CPU is used for when the no picture signal of Scaler is imported, compare timer institute's cumulative time (T) and a plurality of Preset Times that are stored in the memory, to send control signal to Scaler, control Scaler generates the PWM ripple of the corresponding duty ratio of tool, thereby keeps the current brightness of fluorescent tube or the brightness of fluorescent tube is dropped to corresponding default percentage; And be used for when the picture signal output unit has picture signal to export Scaler to, control Scaler generates the PWM ripple of the corresponding duty ratio of tool, returns to normal brightness by this PWM ripple control fluorescent tube.Transducer is used for the PWM ripple of Scaler generation is converted to the alternating current of control lighting tube brightness.
The method that the present invention also provides a kind of lamp tube service life to prolong, it includes following steps: (a) among the detecting Scaler whether the picture signal input is arranged; (b) if no picture signal input among the Scaler starts the duration that timer begins no picture signal input among the accumulative total Scaler; And (c) carry out the lighting tube brightness operation that descends stage by stage, finish.
Wherein step (c) is carried out the lighting tube brightness operation that descends stage by stage, and each stage also comprises following substep: (c1) whether the duration that no picture signal is imported among the real-time judge Scaler reaches a Preset Time; (c2) if the duration that no picture signal is imported among the Scaler reaches Preset Time, lighting tube brightness is dropped to a default percentage of fluorescent tube normal brightness; (c3) if the duration that no picture signal is imported among the Scaler does not reach Preset Time, keep the current brightness of fluorescent tube, timer continues the duration of no picture signal input among the accumulative total Scaler.
Utilize the present invention can reduce lighting tube brightness, the useful life of prolonging lamp tube stage by stage.
[description of drawings]
Fig. 1 is the structural representation of lamp tube service life extension fixture of the present invention.
Fig. 2 is the flow chart of lamp tube service life prolongation method of the present invention.
Fig. 3 is the lighting tube brightness of the execution stage by stage decline operation process chart of lamp tube service life prolongation method of the present invention.
Fig. 4 is the present invention when dividing three phases to carry out lighting tube brightness decline operation, and the brightness of fluorescent tube changes schematic diagram.
[embodiment]
As shown in Figure 1, be the structural representation of lamp tube service life extension fixture of the present invention.This lamp tube service life extension fixture comprises a picture signal output unit 1, a scale controller (Scaler) 2, a transducer (Inverter) 3, a mini program controlling unit (Micro-programmable ControlUnit, MCU) 4 and one fluorescent tube 5.Wherein, fluorescent tube 5 is a Be Controlled object of the present invention.Picture signal output unit 1 is used for 2 output image signals to Scaler.Scaler 2 is used to receive picture signal, and the size of control chart picture, convergent-divergent, contrast, brightness etc.In the present invention, Scaler 2 also accepts the control of MCU 4, according to the situation of picture signal output unit 1 to its output image signal, generates the pulse-width modulation (Pulse-Width-Modulation of tool different duty, PWM) ripple, thereby the brightness of adjusting fluorescent tube 5.MCU4 includes a CPU (Center Processing Unit, CPU) 41, one timer 42, a memory 43 and a plurality of input/output interface (I/O interface) 44.Timer 42 and memory 43 all link to each other with CPU 41, and are subjected to the control of CPU 41.Timer 42 is used for writing down the duration T of each Scaler 2 no picture signal inputs.Memory 43 is ROM or RAM, and it also can non-volatile by other (Nonvolatile) memory replaces, as PROM, EPROM, EEPROM, Flash Memory etc.Memory 43 is used for when dividing n stage to reduce lighting tube brightness, store n Preset Time (T1, T2......Tn) and n default percentage (X1%, X2%......Xn%), wherein the brightness of n default percentage (X1%, X2%......Xn%) after for fluorescent tube decline accounts for the percentage of this fluorescent tube normal brightness, and n is one more than or equal to 1 natural number.When getting n is 3, when promptly dividing the brightness of three phases reduction fluorescent tube 5, the Preset Time that is stored in the memory 43 is respectively T1 (for example 5 seconds), T2 (for example 10 seconds) and T3 (for example 15 seconds), default percentage is respectively X1% (for example 60%), X2% (for example 40%) and X3% (for example 0%), and the brightness after promptly fluorescent tube 5 descends is respectively X1%, X2% and the X3% of normal brightness.When 42 of timers when the cumulative time, T equaled T1, the brightness of fluorescent tube 5 drops to the X1% of normal brightness; When 42 of timers when the cumulative time, T equaled T2, the brightness of fluorescent tube 5 drops to the X2% of normal brightness; When 42 of timers when the cumulative time, T equaled T3, the brightness of fluorescent tube 5 drops to the X3% of normal brightness.T1＜T2＜T3 wherein, X1%〉X2%〉X3%.CPU 41 is used for when Scaler 2 no picture signals are imported, compare 42 cumulative time T of timer and the preset time T n that is stored in the memory 43, to transmit control signal to Scaler2, control Scaler 2 generates the PWM ripple of the corresponding duty ratio of tool, brightness by this PWM ripple control fluorescent tube 5 drops to corresponding default percentage, promptly drops to the Xn% of normal brightness; When the picture signal input was arranged among the Scaler 2 again, CPU41 control Scaler 2 generated the PWM ripple with corresponding duty ratio, returned to normal brightness by this PWM ripple control fluorescent tube 5.A plurality of I/O interfaces 44 are used to connect fluorescent tube 5 and CPU 41, send the control signal of CPU 41 switch fluorescent tubes 5 thus to fluorescent tube 5.Transducer 3 is used for converting the PWM ripple that Scaler 2 generates to alternating current, with the brightness of control fluorescent tube 5.
As shown in Figure 2, be the flow chart of lamp tube service life prolongation method of the present invention.At first MCU 4 detects picture signal input condition (step 200) among the Scaler 2.Judge whether picture signal input (step 201) is arranged among the Scaler 2.If the picture signal input is arranged among the Scaler 2, keep the fluorescent tube normal brightness, flow process finishes (step 202).If no picture signal input among the Scaler 2, CPU 41 starts the duration (step 203) that timer 42 begins no picture signal input among the accumulative total Scaler 2.MCU 4 carries out fluorescent tube 5 brightness decline operations (detailed description is seen Fig. 3) (step 204) jointly stage by stage with Scaler 2 simultaneously.
As shown in Figure 3, be that the present invention carries out fluorescent tube 5 brightness decline operation process charts stage by stage.At first MCU 4 detects picture signal input condition (step 300) among the Scaler 2.Judge whether picture signal input (step 301) is arranged among the Scaler2.If no picture signal input among the Scaler2, the then duration T (step 302) of no picture signal input among the timer 42 accumulative total Scaler 2.CPU 41 is timer 42 duration T that is added up and the preset time T n that is stored in the memory 43 relatively, judges whether T reaches preset time T n (step 303).If T reaches preset time T n, then MCU 4 sends first control signal to Scaler 2, Scaler 2 generates the PWM ripple of the corresponding duty ratio of tool according to this first control signal, by this PWM ripple the Xn% of normal brightness is reduced in the brightness of fluorescent tube 5, changes execution in step 300 (step 304).If T do not reach preset time T n, then Scaler 2 generates the constant PWM ripple of duty ratios, thereby keeps the current brightness of fluorescent tube 5, changes execution in step 300 (step 305).If the picture signal input is arranged among the Scaler 2, then MCU 4 sends second control signal to Scaler 2, and Scaler 2 generates the PWM ripple with corresponding duty ratio according to this second control signal, by this PWM ripple fluorescent tube 5 is returned to normal brightness (step 306).Timer stops cumulative time and zero clearing simultaneously, and flow process finishes (step 307).
As shown in Figure 4, be the present invention when dividing three phases to carry out fluorescent tube 5 brightness decline operations, the brightness of fluorescent tube 5 changes schematic diagram.In the phase I, if MCU 4 detects the picture signal input is not arranged among the Scaler 2, then when 42 cumulative time T of timer reached the preset time T 1 that is stored in the memory 43, the brightness of fluorescent tube 5 dropped to the X1% of normal brightness.In second stage, if MCU 4 also detects the picture signal input is not arranged among the Scaler 2, when then T reached the preset time T 2 that is stored in the memory 43 between 42 timing of timer, the brightness of fluorescent tube 5 dropped to the X2% of normal brightness.In the phase III, if MCU 4 detects yet the picture signal input is not arranged among the Scaler 2, when then T reached the preset time T 3 that is stored in the memory 43 between 42 timing of timer, the brightness of fluorescent tube 5 dropped to the X3% of normal brightness.In above-mentioned three phases, if MCU 4 detects picture signal input is arranged among the Scaler 2, then the brightness of fluorescent tube 5 promptly by current luminance recovery to normal brightness.
Claims (11)
1. lamp tube service life extension fixture, it can reduce the brightness of fluorescent tube stage by stage, and this device comprises a fluorescent tube, one scale controller is used to receive picture signal, one mini program controlling unit is used for detecting scale controller picture signal input condition, it is characterized in that, wherein:
This mini program controlling unit also comprises:
One timer is used for writing down the duration that the no picture signal of each scale controller is imported;
One holder is used to store a plurality of Preset Times and a plurality of default percentage, and wherein these a plurality of default percentages are the percentage that brightness after fluorescent tube descends accounts for this fluorescent tube normal brightness; And
One CPU, duration that more above-mentioned timer is counted and the Preset Time that is stored in the above-mentioned memory are to generate control signal corresponding; And
Above-mentioned scale controller also is used for generating according to above-mentioned control signal the pulse width modulated wave of tool different duty, and controls the brightness of above-mentioned fluorescent tube by this pulse width modulated wave.
2. lamp tube service life extension fixture as claimed in claim 1 is characterized in that, also comprises a picture signal output unit, is used for output image signal to scale controller.
3. lamp tube service life extension fixture as claimed in claim 1 is characterized in that, also comprises a transducer, and the pulse width modulated wave that is used for that above-mentioned scale controller is generated converts the alternating current of control lighting tube brightness to.
4. lamp tube service life extension fixture as claimed in claim 1 is characterized in that, when mini program controlling unit detected in the scale controller input of no picture signal, this mini program controlling unit sent first control signal to scale controller.
5. lamp tube service life extension fixture as claimed in claim 4, it is characterized in that, scale controller receives above-mentioned first control signal, and generates a pulse width modulated wave with corresponding duty ratio according to this first control signal, and is reduced to corresponding brightness by this pulse width modulated wave control fluorescent tube.
6. lamp tube service life extension fixture as claimed in claim 1 is characterized in that, when mini program controlling unit detects picture signal when input is arranged in the scale controller, and this mini program controlling unit sends second control signal to scale controller.
7. lamp tube service life extension fixture as claimed in claim 6, it is characterized in that, scale controller receives above-mentioned second control signal, and generates a pulse width modulated wave with corresponding duty ratio according to this second control signal, and returns to normal brightness by this pulse width modulated wave control fluorescent tube.
8. lamp tube service life extension fixture as claimed in claim 1, it is characterized in that, described timer detects at little program-controlled unit and picks up counting when no picture signal is imported in the scale controller, stops cumulative time and zero clearing when the picture signal input is arranged in scale controller.
9. lamp tube service life prolongation method, the brightness that it can reduce fluorescent tube stage by stage is characterized in that, comprises the steps:
Whether the picture signal input is arranged in the detecting scale controller;
When no picture signal is imported in the scale controller, start the duration that a timer begins no picture signal input in the accumulative total scale controller; And
Carry out the lighting tube brightness operation that descends stage by stage, each stage comprises:
Judge in real time whether this duration reaches a Preset Time;
If this duration reaches a Preset Time, scale controller produces the pulse width modulated wave of the corresponding duty ratio of tool, and drops to a default percentage of fluorescent tube normal brightness by the brightness of this pulse width modulated wave control fluorescent tube; And
If this duration does not reach Preset Time, keep the current brightness of fluorescent tube, timer continues the duration of no picture signal input in the accumulative total scale controller.
10. lamp tube service life prolongation method as claimed in claim 9, it is characterized in that, wherein carry out the lighting tube brightness operation that descends stage by stage, each stage also comprises when the picture signal input is arranged in the scale controller, this scale controller generates the pulse width modulated wave of the corresponding duty ratio of tool, and controls the step that above-mentioned fluorescent tube recovers normal brightness by this pulse width modulated wave.
11. lamp tube service life prolongation method as claimed in claim 9, it is characterized in that, wherein carry out the lighting tube brightness operation that descends stage by stage, each stage also comprises after lighting tube brightness drops to a default percentage of normal brightness, continues to detect in real time the step whether the picture signal input is arranged in the scale controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100280795A CN100544540C (en) | 2004-07-10 | 2004-07-10 | Lamp tube service life extension fixture and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100280795A CN100544540C (en) | 2004-07-10 | 2004-07-10 | Lamp tube service life extension fixture and method |
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| Publication Number | Publication Date |
|---|---|
| CN1719962A CN1719962A (en) | 2006-01-11 |
| CN100544540C true CN100544540C (en) | 2009-09-23 |
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| CNB2004100280795A Expired - Fee Related CN100544540C (en) | 2004-07-10 | 2004-07-10 | Lamp tube service life extension fixture and method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102298911A (en) * | 2010-06-28 | 2011-12-28 | 瀚宇彩晶股份有限公司 | Methods for improving stability and contrast of display device |
| CN103531166A (en) * | 2010-06-28 | 2014-01-22 | 瀚宇彩晶股份有限公司 | Method for improving image contrast of display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4112334A (en) * | 1977-01-28 | 1978-09-05 | Varo, Inc. | Ignition system for extending the lifetime of gas filled electric lamps |
| US5065357A (en) * | 1985-07-22 | 1991-11-12 | Sharp Kabushiki Kaisha | Data processing machine with liquid crystal display and control means for regulating backlighting to the display |
| US20030151601A1 (en) * | 2002-02-09 | 2003-08-14 | Chung In Jae | Apparatus and method of driving discharge tube lamp and liquid crystal display using the same |
| CN2567908Y (en) * | 2002-07-19 | 2003-08-20 | 金宝电子工业股份有限公司 | Device for regulating light source of screen |
-
2004
- 2004-07-10 CN CNB2004100280795A patent/CN100544540C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4112334A (en) * | 1977-01-28 | 1978-09-05 | Varo, Inc. | Ignition system for extending the lifetime of gas filled electric lamps |
| US5065357A (en) * | 1985-07-22 | 1991-11-12 | Sharp Kabushiki Kaisha | Data processing machine with liquid crystal display and control means for regulating backlighting to the display |
| US20030151601A1 (en) * | 2002-02-09 | 2003-08-14 | Chung In Jae | Apparatus and method of driving discharge tube lamp and liquid crystal display using the same |
| CN2567908Y (en) * | 2002-07-19 | 2003-08-20 | 金宝电子工业股份有限公司 | Device for regulating light source of screen |
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| CN1719962A (en) | 2006-01-11 |
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