CN100524429C - Driving method for back light module - Google Patents
Driving method for back light module Download PDFInfo
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- CN100524429C CN100524429C CNB2005101301806A CN200510130180A CN100524429C CN 100524429 C CN100524429 C CN 100524429C CN B2005101301806 A CNB2005101301806 A CN B2005101301806A CN 200510130180 A CN200510130180 A CN 200510130180A CN 100524429 C CN100524429 C CN 100524429C
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- brightness
- kinetic energy
- wave amplitude
- unsaturation
- module backlight
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims abstract description 12
- 230000003071 parasitic effect Effects 0.000 claims abstract description 10
- 230000009514 concussion Effects 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
This invention discloses a drive method for backlight modules, in which, a non-saturated brightness period is modulated by the backlight module in the light modulated period under saturated brightness and a vibration amplitude time sequence of working period of the back transformer is set according to the light modulated period to form switch kinetic energy of the transformer in the non-saturated brightness period so that the switch kinetic energy can eliminate the parasitic capacity effect under the saturated brightness.
Description
Technical field
The present invention relates to a kind of driving method of module backlight, particularly a kind of module backlight adopts the switching kinetic energy of modulation unsaturation brightness cycle with the generation transformer under saturated brightness, thereby eliminates the driving method of parasitic capacitance effect.
Background technology
In the display imaging technique, module backlight plays considerable effect.The performance of brightness uniformly will make that the color that display screen presented is more distinct.Yet, because module backlight adopts the high voltage drive pattern,, or maintain saturated luminance state for a long time if module electric current backlight is anisotropically stable, will produce spuious parasitic capacitance effect.Not only overall brightness is affected, and the display screen image quality also can be affected, and affects indirectly visual performance.
For overcoming parasitic capacitance effect, the US6798151 patent proposed a kind of effectively in and the leakage current, the charge leakage that produce because of stray capacitance between display and the module backlight, making flows through respectively organizes lamp tube current, the energy imbalance of due to leakage current is eliminated, and then the lamp tube light source that keeps consistency.Make panel obtain the uniform luminance of broad range thus.This patent is by direct connection or be connected to the external metallization cover structure of display panel module through the commissure element, or on the plastic material in middle layer, can directly a signal be transferred to the plastic material in external metallization cover structure middle layer, the remaining electric charge that is positioned at display panel can be got rid of, neutralizes or balanced.
But, can not solve basic problem like this.When spuious parasitic capacitance effect produces, the display screen influence that has been interfered in fact, and showing that the usual time is under the saturated luminance state, because stray capacitance almost is in real estate and gives birth to state, this patent can't neutralize or eliminate in real time, so still may influence image quality.
Summary of the invention
Fundamental purpose of the present invention is to overcome above-mentioned defective, for avoiding the existence of this defective, the invention provides a kind of module backlight under saturated brightness, adopt the switching kinetic energy of modulation unsaturation brightness cycle, thereby eliminate the driving method of parasitic capacitance effect with the generation transformer.
Driving method according to a kind of module backlight of the present invention comprises: set the saturated brightness of module backlight; Determine the light modulation cycle of saturated brightness, and modulation goes out a unsaturation brightness cycle in this light modulation cycle; And the work period that determines saturated brightness, and set out the concussion wave amplitude sequential of rear end transformer work period according to this light modulation cycle, drive this module backlight with output kinetic energy, and make transformer in the unsaturation brightness cycle, form the switching kinetic energy of non-vanishing current potential concussion wave amplitude kinetic energy.
Therefore, the present invention has following advantage,, can eliminate the parasitic capacitance effect that this module backlight is produced by switching kinetic energy under saturated brightness that is.
Description of drawings
Fig. 1 is the synoptic diagram of method flow of the present invention.
Fig. 2 is the synoptic diagram of transformer work period of the present invention.
Fig. 3 is the synoptic diagram of transformer output energy of the present invention.
Fig. 4 is the synoptic diagram of another transformer work period of the present invention.
Fig. 5 is the synoptic diagram of another transformer output energy of the present invention.
Embodiment
About detailed content of the present invention and technical descriptioon, existing accompanying drawings is as follows:
See also shown in Fig. 1,2,3, the present invention is a kind of driving method of module backlight, and this method comprises:
Set the saturated brightness 10 of module backlight, alleged saturated brightness typically refers to the maximum that module backlight can present and sets briliancy, and this briliancy performance normally defines by the driving kinetic energy that rear end transformer institute energy output kinetic energy or module maximum backlight can be born.Have different maximum saturation brightness limit according to module unlike material characteristic backlight.The defined saturated brightness of the present invention refers to this module backlight and is in maximum and can bears and drive the spuious parasitic capacitance effect that the kinetic energy state is caused down.
Determine the light modulation cycle 20 of saturated brightness, and modulation goes out a unsaturation brightness cycle E2 in this light modulation cycle E1, alleged light modulation cycle E1 is the maximum brightness value that module backlight is set.In the prior art, this light modulation cycle E1 has defined each pulse wave signal all in the equal fluctuation of maximum amplitude voltage.Output form is in the majority with the square wave of pulse-width regulating device (PWM) output usually, but for ease of understanding the technology of the present invention feature, this light modulation cycle E1 and work period show in string ripple mode.
Determine the work period 30 of saturated brightness, the present invention mainly is a concussion wave amplitude sequential of setting out the rear end transformer work period according to this light modulation cycle E1, drives this module backlight with output kinetic energy.Because the present invention's modulation in the light modulation cycle of saturated brightness E1 goes out a unsaturation brightness cycle E2, therefore, the work period of transformer will form in this unsaturation brightness cycle E2 switches kinetic energy.Different (Fig. 2 illustrates the unsaturation brightness cycle E2 of single pulse wave according to the width among the different unsaturation brightness cycle E2 (or being called as pulse wave composition number), Fig. 4 then illustrates the unsaturation brightness cycle E2 that a plurality of pulse waves are formed), be different in different transformer frequency of operation, light modulation cycle E1 frequency and by the parameter settings such as potential difference (PD) with the concussion wave amplitude kinetic energy V3 of unsaturation brightness and the concussion wave amplitude kinetic energy V1 of this saturated brightness perhaps, it is slightly variant to cause switching the kinetic energy form.This difference can be as shown in Figure 3, switch kinetic energy and comprise the concussion wave amplitude kinetic energy V2 of a supersaturation brightness and the concussion wave amplitude kinetic energy V3 of a unsaturation brightness, perhaps as shown in Figure 5, this switching kinetic energy comprises the concussion wave amplitude kinetic energy V2 of a supersaturation brightness, the concussion wave amplitude kinetic energy V3 of a unsaturation brightness and the concussion wave amplitude kinetic energy V4 of another supersaturation brightness.
In embodiments of the present invention, all non-vanishing current potential of concussion wave amplitude kinetic energy V3 of this unsaturation brightness, cause when avoiding transformer conversion kinetic energy may damaged condition generation.Switch kinetic energy by this, to cause module backlight is not to be in permanent saturated luminance state under actual working state, that is to say,, will cause the concussion wave amplitude kinetic energy V1 of original saturated brightness in the module backlight to form keying switching effect through switching kinetic energy by the switching kinetic energy of transformer.Can eliminate the parasitic capacitance effect of this module backlight under saturated brightness thus.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the driving method of a module backlight comprises:
Set the saturated brightness of module backlight;
Determine the light modulation cycle of saturated brightness, and modulation goes out a unsaturation brightness cycle in the described light modulation cycle; And
Determine the work period of saturated brightness, and set out the concussion wave amplitude sequential of rear end transformer work period according to the described light modulation cycle, drive described module backlight with output kinetic energy, and make transformer in the unsaturation brightness cycle, form the switching kinetic energy of non-vanishing current potential concussion wave amplitude kinetic energy, eliminate the parasitic capacitance effect of described module backlight under saturated brightness by this switching kinetic energy.
2. according to the driving method of the described module backlight of claim 1, it is characterized in that the switching kinetic energy of described transformer comprises the concussion wave amplitude kinetic energy of a supersaturation brightness and the concussion wave amplitude kinetic energy of a unsaturation brightness.
3. according to the driving method of the described module backlight of claim 2, it is characterized in that the potential difference (PD) of the concussion wave amplitude kinetic energy of the concussion wave amplitude kinetic energy of described unsaturation brightness and described supersaturation brightness is decided by the width in unsaturation brightness cycle.
4. according to the driving method of the described module backlight of claim 1, it is characterized in that the switching kinetic energy of described transformer comprises the concussion wave amplitude kinetic energy of a supersaturation brightness, the concussion wave amplitude kinetic energy of a unsaturation brightness and the concussion wave amplitude kinetic energy of another supersaturation brightness.
5. according to the driving method of the described module backlight of claim 4, it is characterized in that the potential difference (PD) of the concussion wave amplitude kinetic energy of the potential difference (PD) of the concussion wave amplitude kinetic energy of the concussion wave amplitude kinetic energy of described unsaturation brightness and a described supersaturation brightness and the concussion wave amplitude kinetic energy of described unsaturation brightness and described another supersaturation brightness is decided by the width in unsaturation brightness cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101301806A CN100524429C (en) | 2005-12-19 | 2005-12-19 | Driving method for back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101301806A CN100524429C (en) | 2005-12-19 | 2005-12-19 | Driving method for back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1987974A CN1987974A (en) | 2007-06-27 |
| CN100524429C true CN100524429C (en) | 2009-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101301806A Expired - Fee Related CN100524429C (en) | 2005-12-19 | 2005-12-19 | Driving method for back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100524429C (en) |
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2005
- 2005-12-19 CN CNB2005101301806A patent/CN100524429C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1987974A (en) | 2007-06-27 |
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Granted publication date: 20090805 Termination date: 20111219 |