CN103323962B - The method of testing of the full HD liquid crystal display of MIPI interface - Google Patents

The method of testing of the full HD liquid crystal display of MIPI interface Download PDF

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CN103323962B
CN103323962B CN201310245655.0A CN201310245655A CN103323962B CN 103323962 B CN103323962 B CN 103323962B CN 201310245655 A CN201310245655 A CN 201310245655A CN 103323962 B CN103323962 B CN 103323962B
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liquid crystal
module
crystal display
mipi
full
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CN103323962A (en
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成小定
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Guangdong Jinlong electromechanical Co., Ltd.
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Wuxi Booyi Optoelectronics Science and Technology Co Ltd
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Abstract

The invention provides the method for testing of the full HD liquid crystal display of a kind of MIPI interface, comprising: step 1, provide an application EP2C5Q208C8N chip and the full HD LCD test fixture of SSD2825 chip, this tool comprises: test module and MIPI module; Step 2, this liquid crystal display to be measured and backlight driver module and MIPI module to be electrically connected; Step 3, switch on power, this microprocessor detects backlight driver module, liquid crystal driver module and signal conversion module; If step 4 detects exception, then send alarm, if detect without exception, then initialization is carried out to those modules; Step 5, this liquid crystal display to be measured of liquid crystal driver module initialization; The rgb signal that microprocessor sends by step 6, signal conversion module is converted to MIPI Signal transmissions to liquid crystal display to be measured, this liquid crystal display display correspondence image to be measured; Step 7, judge that whether this liquid crystal display to be measured is qualified according to image.

Description

The method of testing of the full HD liquid crystal display of MIPI interface
Technical field
The present invention relates to a kind of lcd panel test method, particularly relate to the method for testing of the full HD liquid crystal display of a kind of MIPI interface.
Background technology
Liquid crystal display is the display device of planar ultra-thin, and it is made up of the colour of some or monochrome pixels, is positioned over light source or reflecting surface front.Liquid crystal display has slimming, the feature such as low in energy consumption, widely applicable, enjoys slip-stick artist to favor.And the development of liquid crystal display is based on full HD liquid crystal display now.
The connection mode that the liquid crystal display of existing small-medium size is the most frequently used, be generally MCU pattern and RGB pattern, MCU Schema control is simple and convenient, without the need to clock and synchronizing signal, but will expend GRAM, be difficult to accomplish giant-screen, is usually used in showing rest image; RGB pattern is without the need to GRAM, and transmission speed is very fast, but complicated operation, need clock and synchronizing signal to control, be usually used in display video or animation.But these two kinds of patterns all adopt the circuit design of EPGA, and EPGA edit capability is poor, cannot complete complicated design, and the circuit of EPGA is complicated, consumes energy high, signaling rate is slow, is also easily interfered.And along with the fast development of 3G smart mobile phone, above-mentioned two kinds of patterns are difficult to meet the intelligent requirements of client to mobile device, as data rate fast, high resolving power, small and exquisite precision and energy-conservation etc.
For the problems referred to above, State Patent Office discloses the application for a patent for invention that application number is 201210059828.5, the patent provides a kind of MIPI interface lcd panel test method, the method adopts and drives liquid crystal display based on the test module of S3C2440 chip execution test procedure, and adopt the MIPI module being with SSD2805 chip that rgb signal is converted to MIPI signal, and then pass to liquid crystal display display, complete test, the method transmission speed is high, antijamming capability is strong.So, the known the method for those skilled in the art adopts S3C2440 chip and SSD2805 chip can meet high-definition liquid crystal screen well, and (resolution of the highest support is the test of QHD resolution (540 × 960), is difficult to the test meeting the full HD liquid crystal display (resolution is 1920 × 1080) of main flow now.
Summary of the invention
The object of the present invention is to provide the method for testing of the full HD liquid crystal display of a kind of MIPI interface, the method can test full HD liquid crystal display fast, simplify the production process of full HD liquid crystal display, enhance productivity, and the feature such as the method has that signaling rate is fast, antijamming capability is strong and energy consumption is low.
For achieving the above object, the invention provides the method for testing of the full HD liquid crystal display of a kind of MIPI interface, comprise the following steps:
Step 1, full HD LCD test fixture is provided, this full HD LCD test fixture comprises: test module, the backlight driver module be electrically connected with this test module, and the MIPI module to be electrically connected with this test module, the memory module that described test module comprises microprocessor and is electrically connected with this microprocessor, this memory module in advance burning has test procedure, described MIPI module comprises liquid crystal driver module and signal conversion module, this liquid crystal driver module and signal conversion module are all electrically connected to described microprocessor, described test module adopts EP2C5Q208C8N chip, described MIPI module adopts SSD2825 chip,
Step 2, provide a liquid crystal display to be measured, this liquid crystal display to be measured and backlight driver module and MIPI module are electrically connected;
Step 3, connect the power supply of this full HD LCD test fixture, this microprocessor testing results program also detects being electrically connected at the backlight driver module of this microprocessor, liquid crystal driver module and signal conversion module;
If this microprocessor of step 4 detects that backlight driver module, liquid crystal driver module or signal conversion module are abnormal, then send alarm, if this microprocessor detects that backlight driver module, liquid crystal driver module and signal conversion module are without exception, then initialization is carried out to backlight driver module, liquid crystal driver module and signal conversion module;
The backlight work of step 5, described Microprocessor S3C44B0X backlight driver module drive liquid crystal display to be measured, this liquid crystal display to be measured of liquid crystal driver module initialization;
Step 6, described microprocessor issue rgb signal to signal conversion module, and this rgb signal is converted to MIPI signal and is transferred to liquid crystal display to be measured by described signal conversion module, and this liquid crystal display to be measured is according to this MIPI Signal aspects correspondence image;
Step 7, judge that whether this liquid crystal display to be measured is qualified according to image.
Described full HD LCD test fixture is provided with a USB interface, and this USB interface and described memory module are electrically connected, and described test procedure is burnt in the memory module of test module by this USB interface.
Described full HD LCD test fixture also comprises an interface module, and described interface module is electrically connected with backlight driver module and MIPI module respectively, and during test, described liquid crystal display to be measured is installed and is electrically connected at this interface module.
Described full HD LCD test fixture also comprises a hummer be electrically connected with described microprocessor, and the alarm in described step 4 is the alarm sound that this hummer sends.
1 to 4 tunneling traffic is adopted between described MIPI module and liquid crystal display to be measured.
The mode of the MIPI Signal transmissions of described step 6 is the mode of paired cabling; In described step 6, liquid crystal display to be measured shows black, white, red, green, blue, GTG, coloured image successively according to MIPI signal.
Described step 7 is for judging that whether image is abnormal, and without exception, then this liquid crystal display to be measured is qualified; Abnormal, then this liquid crystal display to be measured is defective.
Described full HD LCD test fixture is also provided with an interrupt switch be electrically connected with described microprocessor, when in described step 7 during image abnormity, is interrupted the conversion of liquid crystal display epigraph to be measured, to analyze this abnormal picture by this interrupt switch.
In described step 7, image is without exception, and this microprocessor sends the qualified signal of this liquid crystal display to be measured, and described qualified signal shows PASS picture for this liquid crystal display to be measured and hummer sends qualified prompt tone.
Described backlight driver module is CP2123 chip.
Beneficial effect of the present invention: the method for testing of the full HD liquid crystal display of MIPI interface of the present invention, control signal and rgb signal is produced by adopting the test module of EP2C5Q208C8N chip, and adopt rgb signal to be converted to MIPI signal based on the MIPI module of SSD2825 chip and to send liquid crystal display to be measured to and show, Direct Screen Writing, transfer rate is high, the test of full HD liquid crystal display can be supported well, make the test of liquid crystal display fast simple and convenient simultaneously, satisfy the demands, and the transmission of MIPI signal adopts paired cabling mode, two lines regard anti-phase as from waveform, antijamming capability is strong, the full HD LCD test fixture applying this method of testing designs small and exquisite precision, energy consumption is low.
In order to further understand feature of the present invention and technology contents, refer to following detailed description for the present invention and accompanying drawing, but accompanying drawing only provides reference and explanation use, is not used for being limited the present invention.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention describe in detail, will make technical scheme of the present invention and other beneficial effect apparent.
In accompanying drawing,
Fig. 1 is the process flow diagram of the method for testing of the full HD liquid crystal display of MIPI interface of the present invention;
Fig. 2 is the module composition schematic diagram of full HD LCD test fixture in the method for testing of the full HD liquid crystal display of MIPI interface of the present invention.
Embodiment
For further setting forth the technological means and effect thereof that the present invention takes, be described in detail below in conjunction with the preferred embodiments of the present invention and accompanying drawing thereof.
Refer to Fig. 1 and Fig. 2, the invention provides the method for testing of the full HD liquid crystal display of a kind of MIPI interface, comprise the following steps:
Step 1, full HD LCD test fixture is provided, this full HD LCD test fixture 20 comprises: test module 22, the backlight driver module 24 be electrically connected with this test module 22, and the MIPI module 26 to be electrically connected with this test module 22, the memory module 224 that described test module 22 comprises microprocessor 222 and is electrically connected with this microprocessor 222, this memory module 224 burning in advance has test procedure, described MIPI module 26 comprises liquid crystal driver module 262 and signal conversion module 264, this liquid crystal driver module 262 and signal conversion module 264 are all electrically connected to described microprocessor 222, described test module 22 adopts EP2C5Q208C8N chip, described MIPI module 26 adopts SSD2825 chip.
Test module 22 described in this programme adopts EP2C5Q208C8N chip, described MIPI module 26 adopts SSD2825 chip, can support that resolution is the test of the liquid crystal display of 1920 × 1080 well, to meet customer need, and adapt to the demand in market better, rgb signal can be converted to MIPI signal by this SSD2825 chip fast, and data transfer speeds is fast.And adopt 1-4 tunneling traffic between described MIPI module 26 and liquid crystal display to be measured 40, data rate is fast.
Described full HD LCD test fixture 20 is provided with a USB interface 27, this USB interface 27 is electrically connected with memory module 224, described test procedure is burnt in the memory module 224 of test module 22 by this USB interface 27, and then can according to the product of different model and different test requests, thus the test procedure that burning is different, this full HD LCD test fixture 20 is made to be applicable to multiple product, expand the scope of application, and then make this full HD LCD test fixture 20 support the full HD liquid crystal display of Multiple Type, make the full HD liquid crystal display of various model without the need to arranging special measurement jig, reduce production cost.
Described backlight driver module 24 adopts CP2123 chip, luminous by the backlight of this CP2123 chip drives liquid crystal display, and then makes liquid crystal display displays images.
Step 2, provide a liquid crystal display 40 to be measured, this liquid crystal display 40 to be measured is electrically connected with backlight driver module 24 and MIPI module 26.
Described full HD LCD test fixture 20 also comprises an interface module 28, and described interface module 28 is electrically connected with backlight driver module 24 and MIPI module 26 respectively, and during test, this interface module 28 is installed and be electrically connected to described liquid crystal display 40 to be measured.
Step 3, connect the power supply of this full HD LCD test fixture 20, this microprocessor 222 testing results program also detects being electrically connected at the backlight driver module 24 of this microprocessor 222, liquid crystal driver module 262 and signal conversion module 264.
If this microprocessor 222 of step 4 detects that backlight driver module 24, liquid crystal driver module 262 or signal conversion module 264 are abnormal, then send alarm, if this microprocessor 222 detects that backlight driver module 24, liquid crystal driver module 262 and signal conversion module 264 are without exception, then initialization is carried out to backlight driver module 24, liquid crystal driver module 262 and signal conversion module 264.
Described full HD LCD test fixture 20 also comprises a hummer 29 be electrically connected with described microprocessor 222, and described alarm is the alarm sound that this hummer 29 sends.
Described microprocessor 222 is when detecting that backlight driver module 24, liquid crystal driver module 262 or signal conversion module 264 are abnormal, control hummer 29 and send alarm sound, there is exception in prompting user backlight driver module 24, liquid crystal driver module 262 or signal conversion module 264, which greatly enhances the accuracy that this full HD LCD test fixture 20 is tested, avoid and use bad measurement jig to draw inaccurate test result, thus cause erroneous judgement.
Step 5, described microprocessor 222 control backlight driver module 24 and drive the backlight (not shown) of liquid crystal display 40 to be measured to work, this liquid crystal display 40 to be measured of liquid crystal driver module 262 initialization.
Step 6, described microprocessor 222 issue rgb signal to signal conversion module 264, and this rgb signal is converted to MIPI signal and is transferred to liquid crystal display 40 to be measured by described signal conversion module 264, and this liquid crystal display 40 to be measured is according to this MIPI Signal aspects correspondence image.
The rgb signal that microprocessor 222 sends is converted to MIPI signal by described signal conversion module 264, and this MIPI signal is transferred to liquid crystal display 40 to be measured by the transmission mode of paired cabling, described liquid crystal display to be measured 40 shows black, white, red, green, blue, GTG, coloured image successively according to this MIPI signal, described paired cabling mode, the i.e. paired cabling of DOUT_N and DOUT_P, become anti-phase from waveform two lines, this enhances antijamming capability, reduce the interference of external electromagnetic waves.
Step 7, judge that whether this liquid crystal display 40 to be measured is qualified according to image.
In this step, judge that whether qualified being specially of liquid crystal display 40 to be measured judges that whether the image that liquid crystal display 40 to be measured shows is abnormal, without exception, then this liquid crystal display 40 to be measured is qualified; Abnormal, then this liquid crystal display 40 to be measured is defective.
Described full HD LCD test fixture 20 is also provided with an interrupt switch 30 be electrically connected with described microprocessor 222.When image abnormity, the conversion of liquid crystal display 40 epigraph to be measured can be interrupted by this interrupt switch 30, to analyze this abnormal picture; When image is without exception, this microprocessor 222 sends the qualified signal of this liquid crystal display to be measured.Concrete, described qualified signal sends qualified prompt tone " drip " for this liquid crystal display 222 to be measured shows PASS picture and hummer 29.In order to the alarm sound that sent by described hummer 29 and qualified prompt tone are distinguished, can arrange qualified prompt tone is minor, and alarm sound is long.
It is worth mentioning that, described liquid crystal driver module 262 uses MIPIDSI interface mode, by configuration scalable data passage, this MIPIDSI interface can realize the message transmission rate of 3Gb/s, data rate is high, it uses low pressure swing difference signal, and has low-down output signal level, in test process, microprocessor 222 in test module 22 transmits control signal and rgb signal to MIPI module 26, rgb signal is converted to MIPI signal and sends liquid crystal display 40 to be measured to and show by the signal conversion module 264 in MIPI module 26, the method set advantage of MCU pattern and RGB pattern, the measurement jig applying the method is made to control simple and convenient, without the need to clock and synchronizing signal, and without the need to expending GRAM, display data are without the need to writing DDRAM, Direct Screen Writing, data rate is fast, the full HD resolution of resolution 1920 × 1080(can be supported well) the test of liquid crystal display.
In sum, the method of testing of the full HD liquid crystal display of MIPI interface of the present invention, control signal and rgb signal is produced by adopting the test module of EP2C5Q208C8N chip, and adopt rgb signal to be converted to MIPI signal based on the MIPI module of SSD2825 chip and to send liquid crystal display to be measured to and show, Direct Screen Writing, transfer rate is high, the test of full HD liquid crystal display can be supported well, make the test of liquid crystal display fast simple and convenient simultaneously, satisfy the demands, and the transmission of MIPI signal adopts paired cabling mode, two lines regard anti-phase as from waveform, antijamming capability is strong, the full HD LCD test fixture applying this method of testing designs small and exquisite precision, energy consumption is low.
The above, for the person of ordinary skill of the art, can make other various corresponding change and distortion according to technical scheme of the present invention and technical conceive, and all these change and be out of shape the protection domain that all should belong to the claims in the present invention.

Claims (9)

1. a method of testing for the full HD liquid crystal display of MIPI interface, is characterized in that, comprise the following steps:
Step 1, full HD LCD test fixture is provided, this full HD LCD test fixture comprises: test module, the backlight driver module be electrically connected with this test module, and the MIPI module to be electrically connected with this test module, the memory module that described test module comprises microprocessor and is electrically connected with this microprocessor, this memory module in advance burning has test procedure, described MIPI module comprises liquid crystal driver module and signal conversion module, this liquid crystal driver module and signal conversion module are all electrically connected to described microprocessor, described test module adopts EP2C5Q208C8N chip, described MIPI module adopts SSD2825 chip,
Step 2, provide a liquid crystal display to be measured, this liquid crystal display to be measured and backlight driver module and MIPI module are electrically connected;
Step 3, connect the power supply of this full HD LCD test fixture, this microprocessor testing results program also detects being electrically connected at the backlight driver module of this microprocessor, liquid crystal driver module and signal conversion module;
If this microprocessor of step 4 detects that backlight driver module, liquid crystal driver module or signal conversion module are abnormal, then send alarm, if this microprocessor detects that backlight driver module, liquid crystal driver module and signal conversion module are without exception, then initialization is carried out to backlight driver module, liquid crystal driver module and signal conversion module;
The backlight work of step 5, described Microprocessor S3C44B0X backlight driver module drive liquid crystal display to be measured, this liquid crystal display to be measured of liquid crystal driver module initialization;
Step 6, described microprocessor issue rgb signal to signal conversion module, and this rgb signal is converted to MIPI signal and is transferred to liquid crystal display to be measured by described signal conversion module, and this liquid crystal display to be measured is according to this MIPI Signal aspects correspondence image;
Step 7, judge that whether this liquid crystal display to be measured is qualified according to image;
1 to 4 tunneling traffic is adopted between described MIPI module and liquid crystal display to be measured.
2. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 1, it is characterized in that, described full HD LCD test fixture is provided with a USB interface, this USB interface and described memory module are electrically connected, and described test procedure is burnt in the memory module of test module by this USB interface.
3. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 1, it is characterized in that, described full HD LCD test fixture also comprises an interface module, described interface module is electrically connected with backlight driver module and MIPI module respectively, during test, described liquid crystal display to be measured is installed and is electrically connected at this interface module.
4. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 1, it is characterized in that, described full HD LCD test fixture also comprises a hummer be electrically connected with described microprocessor, and the alarm in described step 4 is the alarm sound that this hummer sends.
5. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 1, it is characterized in that, the mode of the MIPI Signal transmissions of described step 6 is the mode of paired cabling; In described step 6, liquid crystal display to be measured shows black, white, red, green, blue, GTG, coloured image successively according to MIPI signal.
6. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 4, is characterized in that, described step 7 is for judging that whether image is abnormal, and without exception, then this liquid crystal display to be measured is qualified; Abnormal, then this liquid crystal display to be measured is defective.
7. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 6; it is characterized in that; described full HD LCD test fixture is also provided with an interrupt switch be electrically connected with described microprocessor; when in described step 7 during image abnormity; the conversion of liquid crystal display epigraph to be measured is interrupted, to analyze this abnormal picture by this interrupt switch.
8. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 6, it is characterized in that, in described step 7, image is without exception, this microprocessor sends the qualified signal of this liquid crystal display to be measured, and described qualified signal shows PASS picture for this liquid crystal display to be measured and hummer sends qualified prompt tone.
9. the method for testing of the full HD liquid crystal display of MIPI interface as claimed in claim 1, it is characterized in that, described backlight driver module is CP2123 chip.
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