CN101923821A - Method for detecting backlight currents of liquid crystal display through analog-to-digital conversion inside chip - Google Patents
Method for detecting backlight currents of liquid crystal display through analog-to-digital conversion inside chip Download PDFInfo
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- CN101923821A CN101923821A CN 201010294658 CN201010294658A CN101923821A CN 101923821 A CN101923821 A CN 101923821A CN 201010294658 CN201010294658 CN 201010294658 CN 201010294658 A CN201010294658 A CN 201010294658A CN 101923821 A CN101923821 A CN 101923821A
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Abstract
The invention relates to a method for detecting the backlight currents of a liquid crystal display through analog-to-digital conversion inside a chip. The method comprises the following steps of: (1) connecting circuit modules: connecting a liquid crystal backlight driving module with a liquid crystal display panel, respectively and correspondingly connecting backlight currents 1 to 8 with analog-to-digital conversions1 to 8, and respectively connecting the analog-to-digital conversions 1 to 8 with a built-in central processing unit, wherein the liquid crystal backlight driving module and the built-in central processing unit are used for transmitting control signals, and an image processing chip is correspondingly provided with an image output end and an external input end; and (2) detecting the backlight currents: sequentially carrying out liquid crystal current input, current-to-voltage conversion, analog-to-digital conversion and comparison on interior of the chip and a preset register; respectively judging which paths are qualified and displaying the qualified result on a screen; and judging which paths are disqualified and displaying the disqualified result on the screen. The invention has the advantages of reliable detection performance, reduced misjudgment, simplified operation steps, improved production efficiency and very remarkable effect.
Description
Technical field
The present invention relates to a kind of method of detection LCD monitor back facet current, particularly a kind of method by chip internal analog to digital conversion detection LCD monitor back facet current.
Background technology
Along with electronic market update at full speed, LCD product has become the consumption main flow, and demand is increasing, and output is also more and more, therefore presses for and enhances productivity, and improves production procedure.
In production process of liquid crystal displays, what adopt usually is the method that manually detects the LCD backlight electric current at present.Under the normal operating conditions, back facet current must satisfy the specification of liquid crystal panel, (being generally 20-60mA, is example with AUO M215HW01, and the back facet current minimum is 19mA, is 21mA to the maximum, and representative value is 20mA); Use special-purpose anchor clamps that each road current value is read one by one by the operative employee on the production line, compare with the panel specification again and judge whether these electric currents are normal.This testing process is comparatively loaded down with trivial details, and efficient is not high, is badly in need of improving.
Therefore,, its packaging technology, structural design are rationalized more, continually developed the novel product of efficient energy-saving more, improve market share, become one of new problem that this field technology personnel are badly in need of solving in order to improve the quality of display complete machine.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, provide a kind of technology simple, obvious results is by the method for chip internal analog to digital conversion detection LCD monitor back facet current; Promptly can make chip read the LED current value automatically, and judge the method that it is whether up to specification, thereby reach the purpose of enhancing productivity.
The technical solution adopted in the present invention is for achieving the above object: a kind of method by chip internal analog to digital conversion detection LCD monitor back facet current is characterized in that implementation step is as follows:
(1) carrying out the LCD circuit module connects: the LCD backlight driver module is connected with liquid crystal panel, and the corresponding analog to digital conversion 1 of back facet current 1 to 8 difference to analog to digital conversion 8 connects simultaneously; Analog to digital conversion 1 is connected with built-in central processing unit respectively to analog to digital conversion 8, LCD backlight driver module and built-in central processing unit transmission of control signals; This picture processing chip correspondence is provided with image output, external input terminals;
(2) carrying out backlight currents of liquid crystal display detects: carry out the input of liquid crystal electric current successively, electric current transfers voltage, analog to digital conversion, chip internal and default register to and compares; It is qualified which road judgement contrast draws respectively, and qualified result is presented on the screen, and which road judgement is defective, and defective result is presented on the screen.
The invention has the beneficial effects as follows: remarkable result of the present invention is exactly an operation steps of having simplified production run, improved production efficiency, the operative employee will produce up to a hundred machines every day on the production line, if every has 8 road back facet currents, the workload of manual test is very huge, adopt the automatic method of testing of the present invention that test result is come into plain view, can raise the efficiency greatly.Also improve simultaneously the accuracy rate of LED-backlit check in producing, reduced the disconnected possibility of erroneous judgement.Technology of the present invention is simple, and dependable performance improves the product overall quality, and guarantees the consistance of machine product assembling.
Description of drawings
Fig. 1 is an available liquid crystal display basic module connection diagram;
Fig. 2 is the master chip peripheral circuit synoptic diagram that the present invention uses;
Fig. 3 is the module connection diagram that the present invention realizes function;
Fig. 4 is the invention process flow chart of steps.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, details are as follows for feature:
The technical solution adopted in the present invention is for achieving the above object: a kind of method by chip internal analog to digital conversion detection LCD monitor back facet current is characterized in that implementation step is as follows:
As shown in Figure 1, for existing display backlight drives typical circuit, be example with MP3389, LED1-8 is each paths of LEDs electric current.
The master chip peripheral circuit that Fig. 2 uses for the present invention, effect is to convert back facet current to voltage.
As shown in Figure 2, this circuit comprises resistance R 501, R509, R517, capacitor C 500, devices such as field effect transistor Q507.One road back facet current flows into from LED1, feeds back in the backlight drive module of master chip through field effect transistor Q507, and divider resistance R509, R517 are translated into voltage simultaneously, in the analog-to-digital conversion module of input master chip.If opening circuit appears in this paths of LEDs lamp, draw voltage 5V on then voltage becomes; If short circuit appears in this paths of LEDs lamp, then voltage increases, and can detect the state of backlight by the change in voltage master chip of VDT1, and by that analogy, each road backlight all increases circuit as shown in Figure 2, then can detect the state on every road.
In addition, C500 is a filter capacitor among the figure, and R501 is a pull-up resistor, is connected the voltage V during operate as normal on the Q507 with+5V
GS0.7V, then Q507 conducting; When short circuit appearred in this road backlight, VFB1 voltage increased, in case increase to V
GS＜0.7V, then Q507 ends, and this path disconnects, thereby plays the effect (the master chip upper voltage limit is 5V) of protection master chip.
As shown in Figure 3, the LCD backlight driver module is connected with liquid crystal panel, and the corresponding analog to digital conversion 1 of back facet current 1 to 8 difference to analog to digital conversion 8 connects simultaneously; Analog to digital conversion 1 is connected with built-in central processing unit respectively to analog to digital conversion 8, LCD backlight driver module and built-in central processing unit transmission of control signals; This picture processing chip correspondence is provided with image output, external input terminals.
The present invention is integrated into master chip inside with the LCD backlight drive part; convert back facet current to voltage by external circuit then; analog to digital conversion by chip internal changes voltage into digital value from the analogue value again; pass through comparer again; the current specification that this numerical value and program is default compares, and judges that it is normally still unusual.
Program can be provided with register, and the voltage that is divided to the master chip pin during such as operate as normal is if 2V, and then register is provided with as follows:
00：2V?，?01：3V；
10：4V?，?11：5V；
During this function executing an option can be set in factory's menu, as " back facet current detects automatically ", carry out this function after, the 1 the tunnel to be example, if detecting this road voltage is about 2V, then register is 00, program shows " the 1 the road is normal " on screen; If reach more than the 3V, then register is 01, shows on " the 1st short out road "; If reach 5V, illustrated and opened circuit that then register is 11, show " the 1 the tunnel opens circuit ".Be provided with 8 road back facet currents successively, by that analogy.
As shown in Figure 4, the invention process step is as follows: carry out liquid crystal electric current input successively, electric current transfers voltage, analog to digital conversion, chip internal and default register to and compares; It is qualified which road judgement contrast draws respectively, and qualified result is presented on the screen, and which road judgement is defective, and defective result is presented on the screen.
The execution of above-mentioned functions can be provided with an option in factory's menu, automatically detect as the LED electric current, after finishing above-mentioned functions, soon each road testing result is presented on the screen with the result of clear and definite OK or NG, thereby reach on production line the normal open-and-shut effect whether of each road back facet current, realization production efficiency improves, the production testing robotization.
Above-mentioned with reference to embodiment to this detailed description of being undertaken by the method for chip internal analog to digital conversion detection LCD monitor back facet current; be illustrative rather than determinate; therefore in the variation and the modification that do not break away under the general plotting of the present invention, should belong within protection scope of the present invention.
Claims (1)
1. method by chip internal analog to digital conversion detection LCD monitor back facet current is characterized in that implementation step is as follows:
(1) carrying out the LCD circuit module connects: the LCD backlight driver module is connected with liquid crystal panel, and the corresponding analog to digital conversion 1 of back facet current 1 to 8 difference to analog to digital conversion 8 connects simultaneously; Analog to digital conversion 1 is connected with built-in central processing unit respectively to analog to digital conversion 8, LCD backlight driver module and built-in central processing unit transmission of control signals; This picture processing chip correspondence is provided with image output, external input terminals;
(2) carrying out backlight currents of liquid crystal display detects: carry out the input of liquid crystal electric current successively, electric current transfers voltage, analog to digital conversion, chip internal and default register to and compares; It is qualified which road judgement contrast draws respectively, and qualified result is presented on the screen, and which road judgement is defective, and defective result is presented on the screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010294658 CN101923821A (en) | 2010-09-28 | 2010-09-28 | Method for detecting backlight currents of liquid crystal display through analog-to-digital conversion inside chip |
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| CN 201010294658 CN101923821A (en) | 2010-09-28 | 2010-09-28 | Method for detecting backlight currents of liquid crystal display through analog-to-digital conversion inside chip |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700332A (en) * | 2013-12-11 | 2014-04-02 | 京东方科技集团股份有限公司 | Display device |
| CN106707590A (en) * | 2017-02-27 | 2017-05-24 | 深圳市华星光电技术有限公司 | Display panel over-temperature protection system and display panel over-temperature protection method |
| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
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| CN1980512A (en) * | 2005-12-05 | 2007-06-13 | 盛群半导体股份有限公司 | Drive control circuit of cold cathode fluorescent lamp and method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103700332A (en) * | 2013-12-11 | 2014-04-02 | 京东方科技集团股份有限公司 | Display device |
| CN106707590A (en) * | 2017-02-27 | 2017-05-24 | 深圳市华星光电技术有限公司 | Display panel over-temperature protection system and display panel over-temperature protection method |
| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
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Effective date of registration: 20110825 Address after: 300385 micro industry road, Xiqing District, Tianjin four Applicant after: Tianjin Sanxing Electronic Co., Ltd. Address before: 300385 micro industry road, Xiqing District, Tianjin four Applicant before: Sansung Electronic Display Co., Ltd., Tianjin |
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Application publication date: 20101222 |