CN110941110A - Liquid crystal test backlight control device and method - Google Patents
Liquid crystal test backlight control device and method Download PDFInfo
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- CN110941110A CN110941110A CN201911366309.1A CN201911366309A CN110941110A CN 110941110 A CN110941110 A CN 110941110A CN 201911366309 A CN201911366309 A CN 201911366309A CN 110941110 A CN110941110 A CN 110941110A
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 13
- 235000019557 luminance Nutrition 0.000 description 20
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
本公开提供了液晶测试背光源控制装置及方法，该装置包括：电源单元、辉度调节单元、开关单元、切换单元和控制单元，电源单元至少有两个，至少一个电源单元连接有辉度调节单元，每个电源单元通过一个开关单元连接在背光源上，开关单元的信号输入端连接切换单元的输出端，开关单元在导通时将对应的电源单元与背光源连通，切换单元的输入端连接控制单元的输出端。本公开通过设置多个电源单元，并设置辉度调节单元，使多个电源单元分别对应测试中所需的背光源辉度，保证背光源输入电压的稳定；通过控制单元、切换单元和开关单元的设置，在多个电源单元中进行切换，既满足实际测试中多辉度切换的需求，又降低了频闪值，使测试结果更加准确。
The present disclosure provides a liquid crystal test backlight control device and method, the device includes: a power supply unit, a brightness adjustment unit, a switch unit, a switching unit and a control unit, there are at least two power supply units, and at least one power supply unit is connected to a brightness adjustment unit unit, each power supply unit is connected to the backlight through a switch unit, the signal input end of the switch unit is connected to the output end of the switch unit, the switch unit connects the corresponding power supply unit with the backlight source when it is turned on, and the input end of the switch unit Connect to the output of the control unit. The present disclosure ensures the stability of the input voltage of the backlight source by setting a plurality of power supply units and setting a brightness adjustment unit, so that the multiple power supply units correspond to the brightness of the backlight source required in the test respectively; the control unit, the switching unit and the switching unit It is possible to switch between multiple power supply units, which not only meets the requirement of multi-brightness switching in the actual test, but also reduces the stroboscopic value and makes the test result more accurate.
Description
Technical Field
The disclosure relates to the technical field of liquid crystal display, in particular to a liquid crystal test backlight control device and method.
Background
The backlight source is a light source located at the back of the liquid crystal display, and the light emitting effect of the backlight source directly affects the visual effect of the liquid crystal display module. In the testing of the lcd panel, the lcd test backlight source needs to provide several different luminances (test lamp box surface luminance), and the high and low luminances are frequently switched.
At present, the switching power supply is used for controlling the backlight source in practice, however, when the switching power supply is used for controlling the backlight source, different voltages are required to be loaded to the control end of the switching power supply to control the output of the switching power supply, the control voltage of the input end in the process can be influenced by the external magnetic field, vibration, temperature and the stability of the controller, the stability of the input control voltage is directly influenced, the tiny change of the input control voltage is reflected on the luminance of the backlight source, the stroboscopic value is increased, and the quality of the liquid crystal screen can be misjudged when the liquid crystal screen is detected.
Disclosure of Invention
The present disclosure provides a liquid crystal test backlight control device and method for solving the above problems.
In order to solve at least one of the above technical problems, the present disclosure proposes the following technical solutions:
in a first aspect, the present disclosure provides a liquid crystal test backlight control device, including:
a power supply unit, a brightness adjusting unit, a switch unit, a switching unit and a control unit,
at least two power supply units are provided, at least one power supply unit is connected with a brightness adjusting unit,
each power supply unit is connected with the backlight source through a switch unit, the signal input end of the switch unit is connected with the output end of the switching unit, the switch unit connects the corresponding power supply unit with the backlight source when being conducted,
the input end of the switching unit is connected with the output end of the control unit.
In some embodiments, one diode is disposed between each power supply unit and the backlight.
In some embodiments, the luminance adjusting unit is a resistor.
In some embodiments, the luminance adjusting unit is a potentiometer.
In some embodiments, the switching unit is a relay.
In some embodiments, there are two power supply units, a first power supply unit and a second power supply unit,
the switch unit is a contactor, which is a first contactor and a second contactor respectively,
the first power supply unit is connected with the backlight source through the first contactor, the second power supply unit is connected with the backlight source through the second contactor, the normally open contact of the switching unit is connected with the first contactor in series, and the normally closed contact of the switching unit is connected with the second contactor in series.
In some embodiments, the control unit is a single-chip microcomputer.
In a second aspect, the present disclosure provides a liquid crystal test backlight control method, based on any one of the claims, including the steps of:
setting a brightness adjusting unit to enable at least two power supply units to supply different voltages to the backlight source;
a control unit is arranged, and the control unit controls the switching unit;
the switching unit controls the on and off of the switch unit, so that the on and off of a power supply unit connected with the switch unit are controlled.
In some embodiments, one diode is disposed between each switching cell and the backlight.
In some embodiments, the luminance adjusting unit is a resistor.
The beneficial effects of this disclosure are: the plurality of power supply units are respectively corresponding to the backlight luminance required in the test by arranging the plurality of power supply units and the luminance adjusting unit, so that the stability of the input voltage of the backlight is ensured; through the setting of the control unit, the switching unit and the switch unit, switching is carried out in a plurality of power supply units, the requirement of multi-luminance switching in actual testing is met, the stroboscopic value is reduced, and the testing result is more accurate.
In addition, in the technical solutions of the present disclosure, the technical solutions can be implemented by adopting conventional means in the art, unless otherwise specified.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid crystal test backlight control device provided in the embodiment of the present disclosure.
Fig. 2 is a circuit connection diagram of a portion of another liquid crystal test backlight control device according to an embodiment of the disclosure.
Fig. 3 is a flowchart of a method for controlling a backlight source for liquid crystal test according to an embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the disclosure and are not to be considered as limiting the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between different components and are not to be construed as indicating or implying relative importance.
Example 1:
as shown in fig. 1, the liquid crystal test backlight control device includes: a power supply unit 1, a luminance adjusting unit 2, a switch unit 3, a switching unit 4, and a control unit 5,
at least two power supply units 1, at least one power supply unit 1 is connected with a brightness adjusting unit 2,
each power supply unit 1 is connected to the backlight 6 through a switch unit 3, the signal input end of the switch unit 3 is connected to the output end of the switching unit 4, the switch unit 3 connects the corresponding power supply unit 1 to the backlight 6 when being conducted,
the input end of the switching unit 4 is connected with the output end of the control unit 5.
The beneficial effects of this disclosure are: the plurality of power supply units are respectively corresponding to the backlight luminance required in the test by arranging the plurality of power supply units and the luminance adjusting unit, so that the stability of the input voltage of the backlight is ensured; through the setting of the control unit, the switching unit and the switch unit, switching is carried out in a plurality of power supply units, the requirement of multi-luminance switching in actual testing is met, the stroboscopic value is reduced, and the testing result is more accurate.
Example 2:
as shown in fig. 2, the liquid crystal test backlight control device includes: a power supply unit 1, a luminance adjusting unit 2, a switch unit 3, a switching unit 4, and a control unit 5,
the power supply units 1 are two, a first power supply unit 11 and a second power supply unit 12, each power supply unit 1 is connected with a brightness adjusting unit 2,
the switching unit 3 is a contactor, a first contactor 31 and a second contactor 32,
the first power supply unit 11 is connected with the backlight 6 through a first contactor 31, the second power supply unit 12 is connected with the backlight 6 through a second contactor 32, the switching unit 4 is a relay, a normally open contact of the relay is connected in series with the first contactor 31, and a normally closed contact of the relay is connected in series with the second contactor 32.
In an alternative embodiment, one diode 7 is arranged between each power supply unit 1 and the backlight 6. Therefore, the diode is in one-way conduction and reverse disconnection, reverse current is prevented, and the power supply unit 1 is protected.
In an alternative embodiment, the luminance adjusting unit 2 is a resistor. Therefore, the structure is simple and the cost is low.
In an alternative embodiment, the luminance adjusting unit 2 is a potentiometer. Therefore, the resistance value is adjustable, and the luminance adjustment is convenient.
In an alternative embodiment, the control unit 5 is a single chip microcomputer.
The beneficial effects of this disclosure are: the plurality of power supply units are respectively corresponding to the backlight luminance required in the test by arranging the plurality of power supply units and the luminance adjusting unit, so that the stability of the input voltage of the backlight is ensured; through the setting of the control unit, the switching unit and the switch unit, switching is carried out in a plurality of power supply units, the requirement of multi-luminance switching in actual testing is met, the influence of an external environment on a power supply is reduced, the stroboscopic value is reduced, and the testing result is more accurate.
Example 3:
as shown in fig. 3, the method for controlling a liquid crystal test backlight, based on the device for controlling a liquid crystal test backlight according to any one of the above device embodiments, includes the following steps:
s11: a luminance adjusting unit 2 is provided to make at least two power supply units 1 supply different voltages to the backlight 6;
s12: a control unit 5 is provided, the control unit 5 controlling the switching unit 4;
s13: the switching unit 4 controls the on and off of the switching unit 3, thereby controlling the on and off of the power supply unit 1 connected to the switching unit 3.
In an alternative embodiment, one diode 7 is arranged between each switching cell 3 and the backlight 6.
In an alternative embodiment, the luminance adjusting unit 2 is a resistor.
The liquid crystal test backlight control method in embodiment 3 is based on the liquid crystal test backlight control devices in embodiments 1 and 2 of the present disclosure, and accordingly achieves the technical effects achieved by the liquid crystal test backlight control devices in embodiments 1 and 2 of the present disclosure, and details are not repeated here.
The foregoing is directed to embodiments of the present disclosure, which are provided for illustration only and not for limitation, and it is understood that modifications and substitutions may be made by those skilled in the art without departing from the spirit of the disclosure and all such modifications and substitutions are to be considered within the scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911366309.1A CN110941110A (en) | 2019-12-26 | 2019-12-26 | Liquid crystal test backlight control device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911366309.1A CN110941110A (en) | 2019-12-26 | 2019-12-26 | Liquid crystal test backlight control device and method |
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| CN110941110A true CN110941110A (en) | 2020-03-31 |
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| KR100658445B1 (en) * | 2006-06-27 | 2006-12-19 | 주식회사 파이컴 | Backlight Control Method |
| CN101135423A (en) * | 2006-08-30 | 2008-03-05 | 高宇洲 | A light string with protection and removable LED light source device |
| US20090237348A1 (en) * | 2008-03-19 | 2009-09-24 | Kabushiki Kaisha Toshiba | Liquid crystal device driving apparatus and method |
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