CN201199426Y - Digital converter and display control device - Google Patents
Digital converter and display control device Download PDFInfo
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- CN201199426Y CN201199426Y CNU2008200087787U CN200820008778U CN201199426Y CN 201199426 Y CN201199426 Y CN 201199426Y CN U2008200087787 U CNU2008200087787 U CN U2008200087787U CN 200820008778 U CN200820008778 U CN 200820008778U CN 201199426 Y CN201199426 Y CN 201199426Y
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- 238000010586 diagram Methods 0.000 description 14
- 238000004020 luminiscence type Methods 0.000 description 12
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- 238000010168 coupling process Methods 0.000 description 4
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- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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Abstract
The utility model provides a digital transverter and display controlling means for provide starting voltage to backlight unit. According to the utility model discloses a digital transverter contains detecting element and digital control unit. The detection unit detects the input voltage value of the power supply according to the driving signal. The digital control unit is provided with a comparison table for storing a plurality of preset input voltage values and preset output duty cycles respectively corresponding to the preset input voltage values. In particular, the digital control unit finds out a preset input voltage value matched with the input voltage value as a current voltage value according to the input voltage value query comparison table, takes a preset output duty cycle corresponding to the current voltage value as a current output duty cycle, and provides a starting voltage with the current output duty cycle to the backlight module so as to maintain the starting voltage to be substantially constant.
Description
Technical field
The utility model relates to a kind of digital converter and display control apparatus, particularly relates to a kind of digital converter and the display control apparatus that can regulate and control the luminescence unit operating state of display.
Background technology
In recent years, flourish along with various electronic products, commercial multimedia systems with family expenses are universal all day by day.In most multimedia system, most important hardware just belongs in order to present the display device of image, for example cathode-ray tube display, LCD, plasma scope etc.With the LCD is example, is mostly to utilize analog transverter to control the operating state of its luminescence unit at present, for example, and the brightness of desiring to reach in the cycle in special time.
See also Fig. 1, Fig. 1 shows the functional block diagram of display system 7 of the prior art.This display system 7 comprises an analog transverter (inverter) 70, analog controlling unit 71, a driver (driver) 72, a transformer (transformer) 74, and a display 76.Analog controlling unit 71 is an analog IC.Analog transverter 70 can provide a controlling signal to driver 72, and driver 72 is then adjusted a power supply according to this controlling signal, and driver 72 can select to use full-bridge circuit, half-bridge circuit, Push-Pull circuit or Royal circuit according to design requirement.Controlling signal is generally the PWM signal.Transformer 74 can receive the power supply through adjusting, and after being boosted power supply is offered the luminescence unit 762 in the display 76 again.In practical application, luminescence unit 762 can comprise cathode fluorescent tube (Coldcathode fluorescent lamp, CCFL) or light emitting diode (Light emitting diode, LED) module.Can be about the correlation technique of analog transverter with reference to U.S. Patent number 6,396,722,6,259,615 and 6,804,129.
See also Fig. 2, Fig. 2 shows typical cathode fluorescent tube running voltage and time chart.In prior art, in order to light cathode fluorescent tube, transverter must be after power supply receives input voltage, and the trigger voltage that instantaneous pressure is provided behind the conversion input voltage is to cathode fluorescent tube, the size of this trigger voltage is generally 1.5 to 3 times of lamp works voltage (being about 400V to 800Vrms), and its duration is about about 1.5 seconds.Subsequently, transverter continues to provide operating voltage to cathode fluorescent tube.
Further, trigger voltage that transverter provides or operating voltage are directly proportional with the input voltage that transverter is received, and in other words, when input voltage is high more, trigger voltage that transverter provided or operating voltage are just high more.See also Fig. 3, the transverter input voltage in its expression prior art and the relation of output trigger voltage.As shown in Figure 3, in prior art, when input voltage that transverter received was big more, its trigger voltage that exports luminescence unit to was just big more.Trigger voltage gap when in addition, input voltage is 21.6V and 26.4V can reach 430V.
In practical operation, the input voltage that power supply provided is not steady state value usually, and it may be subjected to the influence of number of users or other factors and change to some extent.For example, when electricity consumption on daytime number was more, input voltage that power supply provides may be less, and when night power customer's number more after a little while, the input voltage that power supply provides just may be bigger.When use comprised the display of aforementioned transverter, transverter provided the trigger voltage of luminescence unit just may therefore produce difference.In addition, the brightness when luminescence unit is activated is relevant with the size of trigger voltage, if the trigger voltage amplitude of variation is excessive, the brightness when luminescence unit is activated also can produce significantly and change, and allows the user feel under the weather.
Therefore, transverter need provide the strangulation compensation mechanism, to keep the constancy of trigger voltage.Yet, because existing transverter uses analog control module to carry out computing, therefore need the huge passive component of collocation quantity, as resistance, electric capacity etc., add the loop with formation and adjust trigger voltage.When the operating state of luminescence unit falls short of specifications when requiring, need carry out the fine setting of passive component (resistance or electric capacity) with manual type, the man-hour of manufacturing and cost are risen.In addition, analog control module does not have elasticity for the adjustment of the operating state of luminescence unit, and differing reaches user's demand surely fully.
The utility model content
Therefore, one side of the present utility model is to provide a kind of digital converter, so that constant substantially trigger voltage to a backlight module to be provided.Especially, the usage quantity that can save passive component according to digital converter of the present utility model reaches aforementioned effect, effectively reduces the complexity of design and the man-hour and the cost of manufacturing.
Digital converter according to a preferred embodiment of the present utility model comprises detecting unit and digital control unit.This detecting unit couples a power supply, in order to detect the input voltage value of this power supply according to the driving signal.This digital control unit then couples this detecting unit, and digital control unit has the table of comparisons, a plurality of default output services frequency that stores a plurality of default input voltage values and distinguish corresponding these default input voltage values.
Especially, digital control unit can be inquired about the table of comparisons according to input voltage value and find out default input voltage value with input voltage value coupling as existing magnitude of voltage, and with corresponding to the default output services frequency of this existing magnitude of voltage as existing output services frequency.Further, digital control unit provides the trigger voltage with this existing output services frequency to backlight module, and is constant substantially to keep trigger voltage.
Digital converter according to another preferred embodiment of the present utility model comprises detecting unit and digital control unit equally.Detecting unit couples power supply, and in order to detect the input voltage value of this power supply according to the driving signal, digital control unit then has equation.Especially, digital control unit produces existing output services frequency according to input voltage value with equation, and provides the trigger voltage with this existing output services frequency to backlight module, and is constant substantially to keep trigger voltage.
Of the present utility modelly be to provide a kind of display control apparatus on the other hand, so that constant substantially trigger voltage to a backlight module to be provided.
Display control apparatus according to a preferred embodiment of the present utility model comprises foregoing digital converter, and it comprises detecting unit and digital control unit.This detecting unit couples a power supply, in order to detect the input voltage value of this power supply according to the driving signal.This digital control unit then couples this detection singly, and digital control unit has the table of comparisons, a plurality of default output services frequency that stores a plurality of default input voltage values and distinguish corresponding these default input voltage values.
Especially, digital control unit can be inquired about the table of comparisons according to input voltage value and find out default input voltage value with input voltage value coupling as existing magnitude of voltage, and with corresponding to the default output services frequency of this existing magnitude of voltage as existing output services frequency.Further, digital control unit provides the trigger voltage with this existing output services frequency to backlight module, and is constant substantially to keep trigger voltage.
Display control apparatus according to another preferred embodiment of the present utility model comprises foregoing digital converter, and it comprises detecting unit and digital control unit.Detecting unit couples power supply, and in order to detect the input voltage value of this power supply according to the driving signal, digital control unit then has equation.Especially, digital control unit produces existing output services frequency according to input voltage value with equation, and provides the trigger voltage with this existing output services frequency to backlight module, and is constant substantially to keep trigger voltage.
Can be further understood by utility model detailed description and the accompanying drawing of following embodiment about advantage of the present utility model and spirit this.
Description of drawings
Fig. 1 shows the functional block diagram of display system of the prior art.
Fig. 2 shows typical cathode fluorescent tube running voltage and time chart.
Fig. 3 represents the transverter input voltage and the relation of exporting trigger voltage in the prior art.
Fig. 4 A shows the functional block diagram according to the digital converter of a specific embodiment of the present utility model.
Fig. 4 B shows the table of comparisons synoptic diagram according to a specific embodiment of the present utility model.
Fig. 5 shows the functional block diagram according to the digital converter of a specific embodiment of the present utility model.
Fig. 6 shows the functional block diagram according to the display control apparatus of a specific embodiment of the present utility model.
Fig. 7 A shows the process flow diagram according to the display control method of a specific embodiment of the present utility model.
Fig. 7 B shows the process flow diagram according to the display control method of a specific embodiment of the present utility model.
Fig. 8 represents according to the trigger voltage that display control method produced of a specific embodiment of the present utility model and the relation of input voltage.
The reference numeral explanation
1,40: digital type transverter 10,402: detecting unit
12,404: digital control unit 120,4040: the table of comparisons
122,4042: equation 2,46: power supply
3,762: display 30: backlight module
4: display control apparatus 406: analog/digital converter
7: display system 70: analog transverter
71: analog controlling unit 72: driver
74: transformer 762: luminescence unit
S50～S56, S60～S66: process step
Embodiment
The utility model provides a kind of digital converter and display control apparatus, in order to the constant substantially trigger voltage backlight module to display to be provided.In practical application, this display can be, but not be subject to LCD.In addition, backlight module can comprise luminescence units such as cathode fluorescent tube or light emitting diode.
See also Fig. 4 A, it shows the functional block diagram according to the digital converter of a specific embodiment of the present utility model.Shown in Fig. 4 A, digital converter 1 of the present utility model comprises a detecting unit 10 and a digital control unit 12, and this digital control unit 12 has the table of comparisons (lookuptable) 120.Please in the lump referring to Fig. 4 B, it shows the table of comparisons synoptic diagram according to a specific embodiment of the present utility model.Shown in Fig. 4 B, the table of comparisons 120 can store a plurality of default output services frequency of a plurality of default input voltage values and respectively corresponding these default input voltage values.
In addition, detecting unit 10 couples power supply 2, in order to detect the input voltage value of this power supply 2 according to driving signal (signal of for example starting shooting).Digital control unit 12 couples the backlight module 30 of detecting unit 10 and display 3, and digital control unit 12 can receive the input voltage value of this power supply 2 from detecting unit 10.Further, digital control unit 12 is found out default input voltage value with this input voltage value coupling as existing magnitude of voltage according to the input voltage value of this power supply 2 inquiry table of comparisons 120, and with corresponding to the default output services frequency of this existing magnitude of voltage as existing output services frequency.Further, digital control unit 12 can continue to provide the trigger voltage with this existing output services frequency to backlight module 30 in default start-up time in the length, to keep the constant of trigger voltage.
In practical application, start-up time, length can be determined by deviser or user, and was not subject to any specific time span.In addition, in practical application, aforementioned existing output services frequency and input voltage value are inverse relation, in other words, when input voltage value was big more, digital control unit 12 was just found out more little default output services frequency as existing output services frequency in the table of comparisons 120.
See also Fig. 5, it shows the functional block diagram according to the digital converter of another specific embodiment of the present utility model.As shown in Figure 5, digital converter 1 of the present utility model comprises detecting unit 10 and digital control unit 12, and this digital control unit 12 has equation 122.In practical application, equation 122 can comprise linear relation for example y=ax, nonlinear relation, differential relationship or integral relation according to demand.In this specific embodiment, equation 122 comprises following formula 1:
Vout=Vin * G * N * D [formula 1]
Wherein, Vout is the trigger voltage value; Vin is an input voltage value; G is a resonant parameter; N is the assorted ratio of transformer; And D is existing output services frequency.In addition, G and N can be fixed value.Change speech, if will keep the constant of Vout, then input voltage value (Vin) just is an inverse relation with existing output services frequency (D).
As previously mentioned, detecting unit 10 couples power supply 2 equally, in order to detect the input voltage value of this power supply 2 according to the driving signal.12 of digital control units receive input voltage value, and produce existing output services frequency (D) with equation 122 according to input voltage value, and provide trigger voltage (Vout) to backlight module 30 with this existing output services frequency (D), constant substantially to keep trigger voltage.
In practical application, digital converter of the present utility model can comprise the table of comparisons and equation simultaneously, produces existing output services frequency with mutual collocation, keeps constant trigger voltage substantially to backlight module to provide.Can be about the correlation technique of digital converter with reference to U.S. Patent number 6,771,029 and 7,126,288.
See also Fig. 6, it shows the functional block diagram according to the display control apparatus of a specific embodiment of the present utility model.As shown in Figure 6, display control apparatus 4 of the present utility model comprises digital converter 40 and power supply 46.Digital converter 40 can comprise detecting unit 402, digital control unit 404 and analog/digital converter 406, and digital control unit 404 can comprise the table of comparisons 4040 and equation 4042.Note that as previously mentioned the digital control unit 404 in the display control apparatus 4 also may only comprise the table of comparisons 4040 or equation 4042.
Wherein, analog/digital converter 406 can receive the simulation controlling signal, and analog controlling signal is converted to drive will drives signal behind the signal and be sent to detecting unit 402.Detecting unit 402 detects the input voltage value of power supply 46 again according to the driving signal, and input voltage value is sent to digital control unit 404.Then, digital control unit 404 produces existing output services frequency according to this input voltage value inquiry table of comparisons 4040 or with equation 4042 computings, and in a Preset Time, continue to provide trigger voltage with this existing output services frequency backlight module 30 to display 3, constant substantially to keep trigger voltage.As previously mentioned, in this specific embodiment, existing output services frequency and input voltage value are inverse relation.The relevant mode that note that the existing output services frequency of digital control unit 404 generations is not given unnecessary details at this in above disclosing.
In practical application, display control apparatus 4 of the present utility model also can comprise driver, transformer and other the suitable assembly in the prior art.In addition, the annexation of these assemblies and digital converter of the present utility model 40 and act as those skilled in the art and know is not given unnecessary details at this.
In practical application, display control apparatus of the present utility model can be integrated in the backlight module of display, perhaps integrates with other assembly of display, or separately exists in the display.In addition, in practical application, display control apparatus of the present utility model can be by being connected with computing machine as interface such as RS232, USB or other suitable interface, and the designer can import any controlled variable of wanting to test to digital control unit by computing machine.
See also Fig. 7 A, it shows the process flow diagram according to the display control method of a specific embodiment of the present utility model.This display control method is in order to provide trigger voltage to backlight module.Shown in Fig. 7 A, display control method of the present utility model can comprise the following step:
At first, in step S50, set up the table of comparisons, it stores a plurality of default output services frequency of a plurality of default input voltage values and respectively corresponding these default input voltage values.Then, in step S52, according to driving the input voltage value that signal detects power supply.And in step S54, find out default input voltage value with the input voltage value coupling as existing magnitude of voltage according to the input voltage value inquiry table of comparisons, and with corresponding to the default output services frequency of this existing magnitude of voltage as existing output services frequency.At last,, provide trigger voltage to backlight module with this existing output services frequency in step S56, constant substantially to keep trigger voltage.
Please again referring to Fig. 7 B, it shows the process flow diagram according to the display control method of another specific embodiment of the present utility model.Shown in Fig. 7 B, display control method of the present utility model also can be the following step:
At first, in step S60, set up equation.Subsequently, in step S62, according to driving the input voltage value that signal detects power supply.Then, in step S64, produce existing output services frequency with equation according to this input voltage value.At last,, provide trigger voltage to backlight module with this existing output services frequency in step S66, constant substantially to keep trigger voltage.
See also Fig. 8, it is represented according to the trigger voltage that display control method produced of a specific embodiment of the present utility model and the relation of input voltage.As shown in Figure 8, can under the situation that input voltage changes arbitrarily, keep constant substantially (in this specific embodiment, the difference of maximum trigger voltage and minimum trigger voltage only is 70V) via the trigger voltage that display control method of the present utility model produced.
In sum,, have the design flexibility of height, can adjust the table of comparisons or equational content according to different demands according to digital converter of the present utility model compared to prior art, and can be by carrying out the increase and decrease or the modification of parameter with computer interconnection.And digital converter of the present utility model can adapt to changeable input voltage, and provides constant substantially trigger voltage to backlight module, keeps the stability of display, and prolongs the serviceable life of backlight module.In addition, the usage quantity of passive component be can save, the complexity of design and the man-hour and the cost of manufacturing effectively reduced according to digital converter of the present utility model, display control apparatus and method.
By the detailed description of above specific embodiment, be to wish to know more to describe feature of the present utility model and spirit, and be not to come aspect of the present utility model is limited with the above-mentioned specific embodiment that is disclosed.On the contrary, its objective is that hope can contain in the aspect of the claim that is arranged in the desire application of the utility model institute of various changes and tool equality.
Claims (16)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200087787U CN201199426Y (en) | 2008-04-07 | 2008-04-07 | Digital converter and display control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200087787U CN201199426Y (en) | 2008-04-07 | 2008-04-07 | Digital converter and display control device |
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| CN201199426Y true CN201199426Y (en) | 2009-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200087787U Expired - Lifetime CN201199426Y (en) | 2008-04-07 | 2008-04-07 | Digital converter and display control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556765B (en) * | 2008-04-07 | 2011-11-23 | 达方电子股份有限公司 | Digital converter, display control device and method |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
-
2008
- 2008-04-07 CN CNU2008200087787U patent/CN201199426Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556765B (en) * | 2008-04-07 | 2011-11-23 | 达方电子股份有限公司 | Digital converter, display control device and method |
| CN103369760A (en) * | 2012-03-26 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Lighting-control circuit and lamp |
| CN103369760B (en) * | 2012-03-26 | 2016-06-22 | 海洋王（东莞）照明科技有限公司 | A kind of emission control circuit and light fixture |
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Granted publication date: 20090225 Effective date of abandoning: 20080407 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20090225 Effective date of abandoning: 20080407 |