CN104599648A - Selectable current type LCM (Liquid Crystal Module) detection jig - Google Patents
Selectable current type LCM (Liquid Crystal Module) detection jig Download PDFInfo
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- CN104599648A CN104599648A CN201410763620.0A CN201410763620A CN104599648A CN 104599648 A CN104599648 A CN 104599648A CN 201410763620 A CN201410763620 A CN 201410763620A CN 104599648 A CN104599648 A CN 104599648A
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Abstract
The invention discloses a selectable current type LCM (Liquid Crystal Module) detection jig. The selectable current type LCM detection jig comprises a DC power adapter, a system main board and a backlight current selecting circuit; the system main board comprises an MCU main control IC, a DC-DC voltage reduction circuit, a backlight booster circuit and an LED drive IC; the DC power adapter is respectively connected with the input end of the backlight booster circuit and the input end of the DC-DC voltage reduction circuit; the output end of the backlight booster circuit is connected to an LED backlight source of an LCM to be detected; the output end of the DC-DC voltage reduction circuit is respectively connected with the MCU main control IC and the LED drive IC; the output end of the MCU main control IC is respectively connected with the LED drive IC and an LCD liquid crystal screen of the LCM to be detected; the output end of the LCD drive IC is connected with the backlight booster circuit and is also connected with the LED backlight source of the LCM to be detected through the backlight current selecting circuit. The selectable current type detection jig is simple in structure, convenient to carry, and low in testing cost.
Description
Technical field
The present invention relates to a kind of tool of heating of LCM module, the LCM module particularly relating to a kind of selectable current is heated tool.
Background technology
The structure of what the tool of heating of traditional LCM module generally adopted is signal-processing board+LED drive plate, the back facet current of this LED drive board only has one grade, every secondary change electric current exports and must make the change of corresponding resistance value, use loaded down with trivial details time-consuming, and counter plate must continue have signal source to input when heating, the tool volume of heating of existing LCM module is larger, expensive simultaneously.
Specifically, there are the following problems for the tool of heating of existing LCM module:
1) electric current of the module group backlight needs of different size is different, and current plank just constantly must go to change resistance value and export corresponding electric current, and this process is loaded down with trivial details time-consuming, waste of manpower.
2) backlight is lighted and panel needs different tools to realize.
3) light panel and need an expensive LVDS signal generator.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of and can provide different electric current according to different module group backlights, and to heat tool without the need to the LCM module of extra LVDS signal generator.
The technical solution used in the present invention is:
The LCM module of selectable current is heated a tool, comprises DC power source adapter, system board, the optional circuit of back facet current, described system board comprises MCU master control IC, DC-DC reduction voltage circuit, backlight voltage booster circuit and LED drive IC, described DC power source adapter connects the input end of backlight voltage booster circuit and the input end of DC-DC reduction voltage circuit respectively, backlight voltage booster circuit output terminal connects the LED backlight of LCM module to be measured, the output terminal of DC-DC reduction voltage circuit connects MCU master control IC and LED drive IC respectively, the output terminal of MCU master control IC connects the LCD liquid crystal display of LED drive IC and LCM module to be measured respectively, the output terminal of LED drive IC connects backlight voltage booster circuit, the output terminal of LED drive IC is connected with the LED backlight of LCM module to be measured by the optional circuit of back facet current.
The optional circuit of described back facet current is connected to the ISEN pin of the LED backlight of LCM module to be measured.
The optional circuit of described back facet current has different resistance by a multidiameter option switch and more than two and resistance parallel with one another forms.
Described MCU master control IC is pre-stored with test pictures information.
Described system board also comprises DVI interface module and USB interface module, and DVI interface module connects the input end of MCU master control IC, the input end of USB interface model calling MCU master control IC.
The present invention adopts above technical scheme, each electric current gear is selected by the optional circuit of back facet current, meet the current needs of each size module group backlight, test pictures information that utilizing the MCU master control IC on display system plate prestores simultaneously stores (red green blue black white, optional) LCM module is heated test, provide signal source without the need to external device.Structure of the present invention is simple, and easy to carry, testing expense is low.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details;
The LCM module of a kind of selectable current of Fig. 1 the present invention is heated the structural representation of tool;
The LCM module of a kind of selectable current of Fig. 2 the present invention is heated the circuit diagram of the optional circuit of back facet current of tool.
Embodiment
As shown in Figure 1 or 2, the present invention includes DC power source adapter, system board, the optional circuit of back facet current, described system board comprises MCU master control IC, DC-DC reduction voltage circuit, backlight voltage booster circuit and LED drive IC, described DC power source adapter connects the input end of backlight voltage booster circuit and the input end of DC-DC reduction voltage circuit respectively, backlight voltage booster circuit output terminal connects the LED backlight of LCM module to be measured, the output terminal of DC-DC reduction voltage circuit connects MCU master control IC and LED drive IC respectively, the output terminal of MCU master control IC connects the LCD liquid crystal display of LED drive IC and LCM module to be measured respectively, the output terminal of LED drive IC connects backlight voltage booster circuit, the output terminal of LED drive IC is connected with the LED backlight of LCM module to be measured by the optional circuit of back facet current.
The optional circuit of described back facet current is connected to the ISEN pin of the LED backlight of LCM module to be measured.
The optional circuit of described back facet current has different resistance by a multidiameter option switch and more than two and resistance parallel with one another forms.
Described MCU master control IC is pre-stored with test pictures information, and as white image information, when practical operation, user can be able to prestore other test pictures information (is white, optional for Hong Lv blue Hei) by demand.
Described system board also comprises DVI interface module and USB interface module, and DVI interface module connects the input end of MCU master control IC, the input end of USB interface model calling MCU master control IC.Outside source can respectively by DVI interface module and signal corresponding to USB interface module input signal.
Just modules principle of work of the present invention illustrates below:
LCM module to be detected of the present invention comprises LED backlight and LCD liquid crystal display.Tool of heating needs to provide signal to heat to LCD liquid crystal display.When only providing backlight electric power to LCM module and do not provide signal source, IPS screen is dark picture, and TN screen is white picture, obvious if the module of IPS screen is be not easy to back-light mechanism slip-stick artist to observe the backlight bad phenomenon such as foreign matter in this case.
DC power source adapter provides direct current 12V to the DC-DC reduction voltage circuit of system board, produces 5V and 3.3V DC voltage respectively by DC-DC reduction voltage circuit, the LCD liquid crystal display work of 5V voltage supply MCU master control IC and LCM module to be measured; 3.3V is as the operating voltage of LED drive IC, DVI interface module and USB interface module.
Start working after the 12V voltage of system board access DC power source adapter, inside the flash memory of described MCU master control inside, burning in advance has the display routine of the LCD liquid crystal display of LCM module to be measured, the program of control LED drive IC work and test pictures information.On the one hand, worked by MCU master control IC internal processes driving LED drive IC, LED drive IC coordinates the backlight voltage booster circuit of loop formation around it DC voltage 12V to be boosted to about the operating voltage 48V of the LED backlight of LCM module to be measured.Simultaneously user can according to the current needs of the backlight of various different size LCM module, and by the current value of the autonomous selection correspondence of the optional circuit of back facet current, LED drive IC exports corresponding electric current to the backlight of LCM module to be measured.On the other hand, MCU master control IC drives the LCD liquid crystal display display of LCM module, and carries the LCD liquid crystal display of test pictures information to LCM module to heat when MCU master control IC enters aging mode.Now slip-stick artist can observe liquid crystal display picture, to observe the bad phenomenon having the various backlights such as foreign.
In addition, after LCM module is heated, if when needing the image quality of carrying out more picture detection LCD liquid crystal display, directly DVI interface module/USB interface module can be accessed in outer signals source, just passable at the controls transfer being undertaken being correlated with by MCU master control IC.
The present invention has prestored test pictures information in the flash memory of MCU master control IC, and as white image information, when practical operation, user can be able to prestore other test pictures information (is white, optional for Hong Lv blue Hei) by demand.MCU master control IC, after the aging duty of unlatching, does not need to be connected into signal source by DVI interface module/USB interface module from outside, and tool of heating just can carry the LCD liquid crystal display of white image information to LCM module to heat after energising start.And be that the LCM module that IPS screen and TN shield all shows white picture after tool start of heating, both achieved and LCM module is heated, observed liquid crystal display picture, also facilitated back-light mechanism slip-stick artist to observe the bad phenomenon having the various backlights such as foreign.
Secondly, in prior art, at the only corresponding current value of the LCM module for a kind of size or a kind of kind, its circuit arranges LED drive IC by the ratio of a pair resistance and exports a fixing current value.The present invention invention increases the optional circuit of back facet current, backlight module for selection different size provides the electric current needed for it, the electric current of original independent one grade is arranged loop and make the many grades of optional circuit of the optional back facet current of electric current into, thus meet the LCM backlight current demand of more sizes and kind.User can according to the current value of the autonomous selection correspondence of the current needs of the backlight of various different size LCM module, and cooperated with LED drive IC is heated to LCM module.
Moreover, the present invention is provided with DVI interface module/USB interface module, make after LCM module is heated, if when needing the image quality of carrying out more picture detection LCD liquid crystal display, directly DVI interface module/USB interface module can be accessed in outer signals source, just passable at the controls transfer being undertaken being correlated with by MCU master control IC.
In sum, the present invention selects each electric current gear by the optional circuit of back facet current, user can heat to LCM module according to the current value of the autonomous selection correspondence of the current needs of the backlight of various different size LCM module, test pictures that utilizing the MCU master control IC on display system plate prestores simultaneously stores (red green blue black white, optional) LCM module is heated test, provide signal source without the need to external device.Structure of the present invention is simple, and easy to carry, testing expense is low.
Claims (5)
1. the LCM module of selectable current is heated a tool, it is characterized in that: it comprises DC power source adapter, system board, the optional circuit of back facet current, described system board comprises MCU master control IC, DC-DC reduction voltage circuit, backlight voltage booster circuit and LED drive IC, described DC power source adapter connects the input end of backlight voltage booster circuit and the input end of DC-DC reduction voltage circuit respectively, backlight voltage booster circuit output terminal connects the LED backlight of LCM module to be measured, the output terminal of DC-DC reduction voltage circuit connects MCU master control IC and LED drive IC respectively, the output terminal of MCU master control IC connects the LCD liquid crystal display of LED drive IC and LCM module to be measured respectively, the output terminal of LED drive IC connects backlight voltage booster circuit, the output terminal of LED drive IC is connected with the LED backlight of LCM module to be measured by the optional circuit of back facet current.
2. the LCM module of a kind of selectable current according to claim 1 is heated tool, it is characterized in that: the optional circuit of described back facet current is connected to the ISEN pin of the LED backlight of LCM module to be measured.
3. the LCM module of a kind of selectable current according to claim 1 is heated tool, it is characterized in that: the optional circuit of described back facet current has different resistance by a multidiameter option switch and more than two and resistance parallel with one another forms.
4. the LCM module of a kind of selectable current according to claim 1 is heated tool, it is characterized in that: described MCU master control IC is pre-stored with test pictures information.
5. the LCM module of a kind of selectable current according to claim 1 is heated tool, it is characterized in that: described system board also comprises DVI interface module and USB interface module, DVI interface module connects the input end of MCU master control IC, the input end of USB interface model calling MCU master control IC.
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| CN201410763620.0A CN104599648B (en) | 2014-12-11 | 2014-12-11 | A kind of LCM modules detection tool of optional electric current |
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| CN201410763620.0A CN104599648B (en) | 2014-12-11 | 2014-12-11 | A kind of LCM modules detection tool of optional electric current |
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| CN104599648B CN104599648B (en) | 2017-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652861A (en) * | 2016-11-30 | 2017-05-10 | 广州视源电子科技股份有限公司 | Display screen detection method and device |
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| US6967701B1 (en) * | 1998-09-19 | 2005-11-22 | Lg.Philips Lcd Co., Ltd. | Liquid crystal display device with black film and method of fabricating the same |
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| CN101340760A (en) * | 2007-07-06 | 2009-01-07 | Nec液晶技术株式会社 | Light-emitting control circuit, light-emitting control method, plane illumination device and liquid crystal display device with the plane illumination device |
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| CN106652861A (en) * | 2016-11-30 | 2017-05-10 | 广州视源电子科技股份有限公司 | Display screen detection method and device |
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