CN203232677U - Liquid crystal display test circuit - Google Patents
Liquid crystal display test circuit Download PDFInfo
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- CN203232677U CN203232677U CN 201320195043 CN201320195043U CN203232677U CN 203232677 U CN203232677 U CN 203232677U CN 201320195043 CN201320195043 CN 201320195043 CN 201320195043 U CN201320195043 U CN 201320195043U CN 203232677 U CN203232677 U CN 203232677U
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Abstract
The utility model discloses a liquid crystal display test circuit which is used for testing a liquid crystal display (LCD). The LCD test circuit comprises a main chip, a DPI interface circuit and a DBI interface circuit. Each I/O interface of the DPI interface circuit and each I/O interface of the DBI interface circuit are correspondingly connected with each I/O interface of the main chip; each input terminal of the DPI interface circuit is used for being correspondingly connected with each RGB interface of the LCD at the time of detection; and each output terminal of the DBI interface circuit is used for being correspondingly connected with each MCU interface of the LCD. In a test circuit of a LCD, the LCD test circuit separates the DPI interface and the DBI interface to prevent test interference caused between different detection interfaces at the time of detection, and is available for improving the test accuracy and ensuring the quality of the LCD to be tested.
Description
Technical field
The utility model relates to liquid crystal detection technique field, particularly lcd panel test circuit.
Background technology
Along with the continuous development of lcd technology, liquid crystal display has been widely used in fields such as mobile phone, computer, TV, and the producer that produces liquid crystal display is also more and more, and the quality assurance of liquid crystal display becomes one of important indicator of weighing each liquid crystal display manufacturer yield-power.At present; test circuit for detection of the liquid crystal display quality adopts single-chip microcomputer as the core of test circuit usually; but; adopt the shortcoming of single-chip microcomputer to be; single-chip microcomputer the I/O mouth that can provide less, same group of test port namely is used for connecting the RGB port of liquid crystal display to be measured usually, is useful on the cpu port that connects liquid crystal display to be measured; usually can cause the test between each port to disturb, influence test result.
The utility model content
Fundamental purpose of the present utility model is for providing a kind of lcd panel test circuit of effectively avoiding testing interference.
The utility model proposes a kind of lcd panel test circuit, for detection of liquid crystal display, comprise master chip, DPI interface circuit and DBI interface circuit, each I/O mouth of each I/O mouth of described DPI interface circuit, described DBI interface circuit respectively with the corresponding connection of each I/O mouth of described master chip, each output port of described DPI interface circuit is used for when detecting the corresponding connection of each RGB port with described liquid crystal display, each output port of described DBI interface circuit for when the detection with the corresponding connection of each MCU port of described liquid crystal display.
Preferably, described master chip is the ARM chip.
Preferably, described lcd panel test circuit also comprises the power circuit module, described power circuit module comprises first mu balanced circuit, second mu balanced circuit and the 3rd mu balanced circuit, the input end of described first mu balanced circuit receives supply voltage, and the output terminal of described first mu balanced circuit is exported first output voltage; The input end of described second mu balanced circuit receives supply voltage, and the output terminal of described second mu balanced circuit is exported second output voltage; The input end of described the 3rd mu balanced circuit receives supply voltage, and the output terminal of described the 3rd mu balanced circuit is exported the 3rd output voltage.
Preferably, described power circuit module also comprises first voltage selecting circuit and second voltage selecting circuit, three road input ends of described first voltage selecting circuit connect the output terminal of described first mu balanced circuit, the output terminal of second mu balanced circuit and the output terminal of the 3rd mu balanced circuit respectively, and the output terminal of described first voltage selecting circuit connects the LCD_IOVCC voltage input end of described DPI interface circuit and the LCD_IOVCC voltage input end of DBI interface circuit;
The two-way input end of described second voltage selecting circuit connects the output terminal of described first mu balanced circuit and the output terminal of second mu balanced circuit respectively, and the output terminal of described second voltage selecting circuit connects the LCD_VCC voltage input end of described DPI interface circuit and the LCD_VCC voltage input end of DBI interface circuit.
Preferably, the output terminal of described first mu balanced circuit also is used for being connected with each LED lamp bar of connecting of described liquid crystal display when detecting.
Preferably, described lcd panel test circuit also comprises at least one group of booster circuit backlight, the input end of described booster circuit backlight receives the input of supply voltage, and the output terminal of described booster circuit backlight is used for being connected with each LED lamp bar in parallel of described liquid crystal display when detecting.
Preferably, described booster circuit backlight comprises that the LED that boosts drives chip, first inductance, first electric capacity, second electric capacity, first stabilivolt and second stabilivolt, the control signal input end of the described LED of boosting driving chip connects the control signal output terminal of described master chip, the voltage input end that the described LED that boosts drives chip receives the input of supply voltage, the described LED that boosts drives the voltage input end of chip through described first capacity earth, the voltage input end that the described LED of boosting drives chip also connects the voltage jump end that the described LED that boosts drives chip through described first inductance, the voltage jump end of the described LED of boosting driving chip also connects the anode of described first stabilivolt, the negative electrode of described first stabilivolt connects the lock-on signal input end that the described LED that boosts drives chip, the described LED that boosts drives the lock-on signal input end of chip through described second capacity earth, the LED drive end that the described LED of boosting drives chip connects the LED driving voltage input end of described DPI interface circuit and the LED driving voltage input end of DBI interface circuit, the LED drive end of the described LED of boosting driving chip also connects the negative electrode of described second stabilivolt, the plus earth of described second stabilivolt, the described LED that boosts drives the earth terminal ground connection of chip.
Preferably, described lcd panel test circuit also comprises the DC/DC modular converter, described DC/DC modular converter comprises VGH change-over circuit and VGL change-over circuit, the input end of described VGH change-over circuit receives the input of supply voltage, and the output terminal of described VGH change-over circuit connects the VGH voltage input end of described DPI interface circuit and the VGH voltage input end of DBI interface circuit;
The input end of described VGL change-over circuit receives the input of supply voltage, and the output terminal of described VGL change-over circuit connects the VGL voltage input end of described DPI interface circuit and the VGL voltage input end of DBI interface circuit.
Preferably, described VGH change-over circuit comprises step-up DC/DC converter, second inductance, the 3rd stabilivolt, the 3rd electric capacity, the 4th electric capacity, first resistance and first adjustable resistance, the shutdown control end of described step-up DC/DC converter connects the first stopping signal output terminal of described master chip, the voltage input end of described step-up DC/DC converter receives the input of supply voltage, the voltage input end of described step-up DC/DC converter is through described the 3rd capacity earth, the voltage input end of described step-up DC/DC converter also connects the voltage jump end of described step-up DC/DC converter through described second inductance, described step-up DC/voltage jump the end of DC converter also connects the anode of described the 3rd stabilivolt, the negative electrode of described the 3rd stabilivolt is through the 4th capacity earth, the negative electrode of described the 3rd stabilivolt also connects the VGH voltage input end of described DPI interface circuit and the VGH voltage input end of DBI interface circuit, the negative electrode of described the 3rd stabilivolt also connects the feedback end of described step-up DC/DC converter through described first resistance, the feedback end of described step-up DC/DC converter is also through the described first adjustable resistance ground connection, the earth terminal ground connection of described step-up DC/DC converter;
Described VGL change-over circuit comprises negative output type DC/DC converter; the 3rd inductance; the 4th stabilivolt; the 5th stabilivolt; the 5th electric capacity; the 6th electric capacity; the 7th electric capacity; the 8th electric capacity; second resistance and second adjustable resistance; the shutdown control end of described negative output type DC/DC converter connects the second stopping signal output terminal of described master chip; the voltage input end of described negative output type DC/DC converter receives the input of supply voltage; the voltage input end of described negative output type DC/DC converter is through described the 5th capacity earth; the voltage input end of described negative output type DC/DC converter also connects the voltage jump end of described negative output type DC/DC converter through described the 3rd inductance; the voltage jump end of described negative output type DC/DC converter also connects the anode of described the 4th stabilivolt and the negative electrode of the 5th stabilivolt respectively through described the 6th electric capacity; the plus earth of described the 4th stabilivolt; the anode of described the 5th stabilivolt is through described the 7th capacity earth; the anode of described the 5th stabilivolt also connects the VGL voltage input end of described DPI interface circuit and the VGL voltage input end of DBI interface circuit; the anode of described the 5th stabilivolt also connects the feedback end of described negative output type DC/DC converter through described the 8th electric capacity; the anode of described the 5th stabilivolt also connects the feedback end of described negative output type DC/DC converter through described second resistance; the feedback end of described negative output type DC/DC converter is also through the described second adjustable resistance ground connection, the earth terminal ground connection of described negative output type DC/DC converter.
Preferably, described lcd panel test circuit also comprises usb circuit, jtag interface circuit and SERIAL interface circuit, the input end of described usb circuit connects the usb data end of described master chip, the input end of described jtag interface circuit connects the JTAG data terminal of described master chip, and the input end of described SERIAL interface circuit connects the SERIAL data terminal of described master chip.
The utility model separates DPI interface and DBI interface in the test circuit of liquid crystal display, and the test of having avoided causing between the different detection port when detecting is disturbed, and is conducive to improve the accuracy of test, guarantees the quality of liquid crystal display to be measured; Select for use the ARM chip as master chip, when realizing clock control, directly use the clock signal of system in the ARM chip, need not to put clock signal circuit in outer periphery, can effectively improve the speed of signal transmission; Adopted the mu balanced circuit in the power circuit module that the 5V input voltage is converted to 3.3V, 2.8V and 1.8V, guaranteed the stability to ARM master chip and each output voltage, the big electric current of having avoided short circuit or open circuit because of liquid crystal display to be measured or extraneous switching circuit board to cause burns out liquid crystal display or mainboard; Increased by first voltage selecting circuit and second voltage selecting circuit, can realize the selection to the magnitude of voltage of IOVCC and VCC, can simulate different terminal platforms two main voltages of liquid crystal display are selected input; Adopt booster circuit backlight to provide enough backlight driving voltage for liquid crystal display to be measured, the dispense with outer connecting power case has been saved testing cost, and safe, maintenance easily; Adopt the DC/DC modular converter, the needed VGH of digital screen and VGL voltage can be provided, expanded the scope of the screen type that test board can test; Provide usb circuit, jtag interface circuit and SERIAL interface circuit, for the data transmission between ARM master chip and the computer is provided convenience.
Description of drawings
Fig. 1 is the structural representation of the utility model lcd panel test circuit first embodiment;
Fig. 2 is the structural representation of the utility model lcd panel test circuit second embodiment;
Fig. 3 is the structural representation of the utility model lcd panel test circuit the 3rd embodiment;
Fig. 4 is the structural representation of the utility model lcd panel test circuit the 4th embodiment;
Fig. 5 (a) is the structural representation of VGH change-over circuit among the utility model lcd panel test circuit the 5th embodiment;
Fig. 5 (b) is the structural representation of VGL change-over circuit among the utility model lcd panel test circuit the 5th embodiment;
Fig. 6 is the structural representation of the utility model lcd panel test circuit the 6th embodiment.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Fig. 1 is the structural representation of the utility model lcd panel test circuit first embodiment, the lcd panel test circuit that this embodiment proposes, for detection of liquid crystal display 100, comprise master chip 200, DPI interface circuit 300 and DBI interface circuit 400, each I/O mouth of DPI interface circuit 300, each I/O mouth of DBI interface circuit 400 respectively with the corresponding connection of each I/O mouth of master chip 200, each output port of DPI interface circuit 300 is used for when detecting the corresponding connection of each RGB port with liquid crystal display 100, each output port of DPI interface circuit 300 for when the detection with the corresponding connection of each MCU port of liquid crystal display 100.Because DPI interface and DBI interface are separated, the test of having avoided causing between the different detection port when detecting is disturbed, and is conducive to improve the accuracy of test, guarantees the quality of liquid crystal display 100 to be measured.
As shown in Figure 2, Fig. 2 is the structural representation of the utility model lcd panel test circuit second embodiment, present embodiment is that the power circuit module in the lcd panel test circuit is described in detail, the power circuit module comprises first mu balanced circuit 501, second mu balanced circuit 502 and the 3rd mu balanced circuit 503, the input end of first mu balanced circuit 501 receives supply voltage VDD 5V, the output terminal of first mu balanced circuit 501 is exported the first output voltage V DD 3.3V, and the output terminal of first mu balanced circuit 501 also is used for being connected with each LED lamp bar of connecting of liquid crystal display 100 when detecting; The input end of second mu balanced circuit 502 receives supply voltage VDD 5V, and the output terminal of second mu balanced circuit 502 is exported the second output voltage V DD 2.8V; The input end of the 3rd mu balanced circuit 503 receives supply voltage VDD 5V, and the output terminal of the 3rd mu balanced circuit 503 is exported the 3rd output voltage V DD 1.8V.Wherein, can adopt chip LM1117 as the voltage stabilizing IC of first mu balanced circuit 501, second mu balanced circuit 502 and the 3rd mu balanced circuit 503, particular circuit configurations is not given unnecessary details at this with reference to Fig. 2.Owing to adopted the mu balanced circuit in the above-mentioned power circuit module that the 5V input voltage is converted to 3.3V, 2.8V and 1.8V, guaranteed the stability to ARM master chip and each output voltage, the big electric current of having avoided short circuit or open circuit because of liquid crystal display to be measured or extraneous switching circuit board to cause burns out liquid crystal display or mainboard.
As shown in Figure 3, Fig. 3 is the structural representation of the utility model lcd panel test circuit the 3rd embodiment, present embodiment is that first voltage selecting circuit 601 of power circuit module in the lcd panel test circuit and second voltage selecting circuit 602 are described in detail, three road input ends of first voltage selecting circuit 601 connect the output terminal of first mu balanced circuit 501 respectively, the output terminal of the output terminal of second mu balanced circuit 502 and the 3rd mu balanced circuit 503, the output terminal of first voltage selecting circuit 601 connects the LCD_IOVCC voltage input end of DPI interface circuit 300 and the LCD_IOVCC voltage input end of DBI interface circuit 400.By the gating of first voltage selecting circuit 601, realize the Control of Voltage to the LCD_IOVCC of output.The two-way input end of second voltage selecting circuit 602 connects the output terminal of first mu balanced circuit 501 and the output terminal of second mu balanced circuit 502 respectively, and the output terminal of second voltage selecting circuit 602 connects the LCD_VCC voltage input end of DPI interface circuit 300 and the LCD_VCC voltage input end of DBI interface circuit 400.By the gating of second voltage selecting circuit 602, realize the Control of Voltage to the LCD_VCC of output.Because present embodiment has increased by first voltage selecting circuit 601 and second voltage selecting circuit 602, can realize the selection to the magnitude of voltage of IOVCC and VCC, can simulate different terminal platforms two main voltages of liquid crystal display are selected input.
As shown in Figure 4, Fig. 4 is the structural representation of the utility model lcd panel test circuit the 4th embodiment, present embodiment is the detailed description to booster circuit 700 backlight in the lcd panel test circuit, the input end of booster circuit 700 backlight receives the input of supply voltage VDD 5V, and the output terminal of booster circuit 700 backlight is used for being connected with each LED lamp bar in parallel of liquid crystal display 100 when detecting.Concrete, booster circuit 700 backlight comprises that the LED that boosts drives chip U1, first inductance L 1, first capacitor C 1, second capacitor C 2, the first stabilivolt D1 and the second stabilivolt D2, the LED that boosts drives chip U1 can adopt chip LT3593, the LED that boosts drives the control signal output terminal GPB1 of the control signal input end CTRL connection master chip 200 of chip U1, the LED that boosts drives the input of the voltage input end VIN reception supply voltage VDD 5V of chip U1, the LED that boosts drives the voltage input end VIN of chip U1 through first capacitor C, 1 ground connection, the voltage input end VIN that the LED that boosts drives chip U1 also connects the voltage jump end SW that the LED that boosts drives chip U1 through first inductance L 1, the voltage jump end SW of the LED that boosts driving chip U1 also connects the anode of the first stabilivolt D1, the negative electrode of the first stabilivolt D1 connects the lock-on signal input end CAP that the LED that boosts drives chip U1, the LED that boosts drives the lock-on signal input end CAP of chip U1 through second capacitor C, 2 ground connection, the LED drive end " LED " that the LED that boosts drives chip U1 connects the LED driving voltage input end BL_A of DPI interface circuit 300 and the LED driving voltage input end BL_A of DBI interface circuit 400, the LED drive end of the LED that boosts driving chip U1 also connects the negative electrode of the second stabilivolt D2, the plus earth of the second stabilivolt D2, the LED that boosts drives the earth terminal GND ground connection of chip U1.
In the present embodiment, the lcd panel test circuit comprises at least one group of booster circuit 700 backlight, the supply voltage of 5V is after booster circuit 700 conversions backlight, the constant current of output 20mA, every group of booster circuit 700 backlight can drive 10 LED lamp, can increase the group number of booster circuit 700 backlight according to the LED lamp bar quantity of liquid crystal display 100 to be measured, can be liquid crystal display to be measured enough backlight driving voltage are provided, the high voltage of 25V particularly, the dispense with outer connecting power case, saved testing cost, and safe, maintenance easily.
Shown in Fig. 5 (a) and Fig. 5 (b), Fig. 5 (a) is the structural representation of VGH change-over circuit among the utility model lcd panel test circuit the 5th embodiment, and Fig. 5 (b) is the structural representation of VGL change-over circuit among the utility model lcd panel test circuit the 5th embodiment.Present embodiment is to DC/DC modular converter in the lcd panel test circuit, the DC/DC modular converter comprises VGH change-over circuit 801 and VGL change-over circuit 802, the input end of VGH change-over circuit 801 receives the input of supply voltage VDD 5V, the output terminal of VGH change-over circuit 801 connects the VGH voltage input end V+ of DPI interface circuit 300 and the VGH voltage input end V+ of DBI interface circuit 400, output+18V voltage; The input end of VGL change-over circuit 802 receives the input of supply voltage VDD 5V, and the output terminal of VGL change-over circuit 802 connects the VGL voltage input end V-of DPI interface circuit 300 and the VGL voltage input end V-of DBI interface circuit 400, output-7V voltage.
Concrete, VGH change-over circuit 801 comprises step-up DC/DC converter U2, second inductance L 2, the 3rd stabilivolt D3, the 3rd capacitor C 3, the 4th capacitor C 4, first resistance R 1 and the first adjustable resistance R3, step-up DC/DC converter U2 can adopt chip LT1615, the shutdown control end SHDN of step-up DC/DC converter U2 connects the first stopping signal output terminal GPB2 of master chip 200, the voltage input end VIN of step-up DC/DC converter U2 receives the input of supply voltage VDD 5V, the voltage input end VIN of step-up DC/DC converter U2 is through the 3rd capacitor C 3 ground connection, the voltage input end VIN of step-up DC/DC converter U2 also connects the voltage jump end SW of step-up DC/DC converter U2 through second inductance L 2, step-up DC/voltage jump end SW of DC converter U2 also connects the anode of the 3rd stabilivolt D3, the negative electrode of the 3rd stabilivolt D3 is through the 4th capacitor C 4 ground connection, the negative electrode of the 3rd stabilivolt D3 also connects the VGH voltage input end V+ of DPI interface circuit 300 and the VGH voltage input end V+ of DBI interface circuit 400, the negative electrode of the 3rd stabilivolt D3 also connects the feedback end FB of step-up DC/DC converter U2 through first resistance R 1, the feedback end FB of step-up DC/DC converter U2 is also through the first adjustable resistance R3 ground connection, the earth terminal GND ground connection of step-up DC/DC converter U2;
VGL change-over circuit 802 comprises negative output type DC/DC converter U3; the 3rd inductance L 3; the 4th stabilivolt D4; the 5th stabilivolt D5; the 5th capacitor C 5; the 6th capacitor C 6; the 7th capacitor C 7; the 8th capacitor C 8; second resistance R 2 and the second adjustable resistance R4; negative output type DC/DC converter U3 can adopt chip LT1617; the shutdown control end SHDN of negative output type DC/DC converter U3 connects the second stopping signal output terminal GPB3 of master chip 200; the voltage input end VIN of negative output type DC/DC converter U3 receives the input of supply voltage VDD 5V; the voltage input end VIN of negative output type DC/DC converter U3 is through the 5th capacitor C 5 ground connection; the voltage input end VIN of negative output type DC/DC converter U3 also connects the voltage jump end SW of negative output type DC/DC converter U3 through the 3rd inductance L 3; the voltage jump end SW of negative output type DC/DC converter U3 also connects the anode of the 4th stabilivolt D4 and the negative electrode of the 5th stabilivolt D5 respectively through the 6th capacitor C 6; the plus earth of the 4th stabilivolt D4; the anode of the 5th stabilivolt D5 is through the 7th capacitor C 7 ground connection; the anode of the 5th stabilivolt D5 also connects the VGL voltage input end V-of DPI interface circuit 300 and the VGL voltage input end V-of DBI interface circuit 400; the anode of the 5th stabilivolt D5 also connects the feedback end FB of negative output type DC/DC converter U3 through the 8th capacitor C 8; the anode of the 5th stabilivolt D5 also connects the feedback end FB of negative output type DC/DC converter U3 through second resistance R 2; the feedback end FB of negative output type DC/DC converter U3 is also through the second adjustable resistance R4 ground connection, the earth terminal GND ground connection of negative output type DC/DC converter U3.
Present embodiment adopts the DC/DC modular converter, the needed VGH of digital screen and VGL voltage can be provided, and has expanded the scope of the screen type that test board can test.
As shown in Figure 6, Fig. 6 is the structural representation of the utility model lcd panel test circuit the 6th embodiment, in the present embodiment, usb circuit 901, jtag interface circuit 902 and SERIAL interface circuit 903 have been increased, the input end of usb circuit 901 connects the usb data end of master chip 200, the input end of jtag interface circuit 902 connects the JTAG data terminal of master chip 200, and the input end of SERIAL interface circuit 903 connects the SERIAL data terminal of master chip 200.The data transmission that above-mentioned each interface circuit can be between ARM master chip and the computer is provided convenience.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. lcd panel test circuit, for detection of liquid crystal display, it is characterized in that, comprise master chip, DPI interface circuit and DBI interface circuit, each I/O mouth of each I/O mouth of described DPI interface circuit, described DBI interface circuit respectively with the corresponding connection of each I/O mouth of described master chip, each output port of described DPI interface circuit is used for when detecting the corresponding connection of each RGB port with described liquid crystal display, each output port of described DBI interface circuit for when the detection with the corresponding connection of each MCU port of described liquid crystal display.
2. lcd panel test circuit according to claim 1 is characterized in that, described master chip is the ARM chip.
3. lcd panel test circuit according to claim 2, it is characterized in that, also comprise the power circuit module, described power circuit module comprises first mu balanced circuit, second mu balanced circuit and the 3rd mu balanced circuit, the input end of described first mu balanced circuit receives supply voltage, and the output terminal of described first mu balanced circuit is exported first output voltage; The input end of described second mu balanced circuit receives supply voltage, and the output terminal of described second mu balanced circuit is exported second output voltage; The input end of described the 3rd mu balanced circuit receives supply voltage, and the output terminal of described the 3rd mu balanced circuit is exported the 3rd output voltage.
4. lcd panel test circuit according to claim 3, it is characterized in that, described power circuit module also comprises first voltage selecting circuit and second voltage selecting circuit, three road input ends of described first voltage selecting circuit connect the output terminal of described first mu balanced circuit, the output terminal of second mu balanced circuit and the output terminal of the 3rd mu balanced circuit respectively, and the output terminal of described first voltage selecting circuit connects the LCD_IOVCC voltage input end of described DPI interface circuit and the LCD_IOVCC voltage input end of DBI interface circuit;
The two-way input end of described second voltage selecting circuit connects the output terminal of described first mu balanced circuit and the output terminal of second mu balanced circuit respectively, and the output terminal of described second voltage selecting circuit connects the LCD_VCC voltage input end of described DPI interface circuit and the LCD_VCC voltage input end of DBI interface circuit.
5. lcd panel test circuit according to claim 3 is characterized in that, the output terminal of described first mu balanced circuit also is used for being connected with each LED lamp bar of connecting of described liquid crystal display when detecting.
6. lcd panel test circuit according to claim 2, it is characterized in that, also comprise at least one group of booster circuit backlight, the input end of described booster circuit backlight receives the input of supply voltage, and the output terminal of described booster circuit backlight is used for being connected with each LED lamp bar in parallel of described liquid crystal display when detecting.
7. lcd panel test circuit according to claim 6, it is characterized in that, described booster circuit backlight comprises that the LED that boosts drives chip, first inductance, first electric capacity, second electric capacity, first stabilivolt and second stabilivolt, the control signal input end of the described LED of boosting driving chip connects the control signal output terminal of described master chip, the voltage input end that the described LED that boosts drives chip receives the input of supply voltage, the described LED that boosts drives the voltage input end of chip through described first capacity earth, the voltage input end that the described LED of boosting drives chip also connects the voltage jump end that the described LED that boosts drives chip through described first inductance, the voltage jump end of the described LED of boosting driving chip also connects the anode of described first stabilivolt, the negative electrode of described first stabilivolt connects the lock-on signal input end that the described LED that boosts drives chip, the described LED that boosts drives the lock-on signal input end of chip through described second capacity earth, the LED drive end that the described LED of boosting drives chip connects the LED driving voltage input end of described DPI interface circuit and the LED driving voltage input end of DBI interface circuit, the LED drive end of the described LED of boosting driving chip also connects the negative electrode of described second stabilivolt, the plus earth of described second stabilivolt, the described LED that boosts drives the earth terminal ground connection of chip.
8. lcd panel test circuit according to claim 2, it is characterized in that, also comprise the DC/DC modular converter, described DC/DC modular converter comprises VGH change-over circuit and VGL change-over circuit, the input end of described VGH change-over circuit receives the input of supply voltage, and the output terminal of described VGH change-over circuit connects the VGH voltage input end of described DPI interface circuit and the VGH voltage input end of DBI interface circuit;
The input end of described VGL change-over circuit receives the input of supply voltage, and the output terminal of described VGL change-over circuit connects the VGL voltage input end of described DPI interface circuit and the VGL voltage input end of DBI interface circuit.
9. lcd panel test circuit according to claim 8, it is characterized in that, described VGH change-over circuit comprises step-up DC/DC converter, second inductance, the 3rd stabilivolt, the 3rd electric capacity, the 4th electric capacity, first resistance and first adjustable resistance, the shutdown control end of described step-up DC/DC converter connects the first stopping signal output terminal of described master chip, the voltage input end of described step-up DC/DC converter receives the input of supply voltage, the voltage input end of described step-up DC/DC converter is through described the 3rd capacity earth, the voltage input end of described step-up DC/DC converter also connects the voltage jump end of described step-up DC/DC converter through described second inductance, described step-up DC/voltage jump the end of DC converter also connects the anode of described the 3rd stabilivolt, the negative electrode of described the 3rd stabilivolt is through the 4th capacity earth, the negative electrode of described the 3rd stabilivolt also connects the VGH voltage input end of described DPI interface circuit and the VGH voltage input end of DBI interface circuit, the negative electrode of described the 3rd stabilivolt also connects the feedback end of described step-up DC/DC converter through described first resistance, the feedback end of described step-up DC/DC converter is also through the described first adjustable resistance ground connection, the earth terminal ground connection of described step-up DC/DC converter;
Described VGL change-over circuit comprises negative output type DC/DC converter; the 3rd inductance; the 4th stabilivolt; the 5th stabilivolt; the 5th electric capacity; the 6th electric capacity; the 7th electric capacity; the 8th electric capacity; second resistance and second adjustable resistance; the shutdown control end of described negative output type DC/DC converter connects the second stopping signal output terminal of described master chip; the voltage input end of described negative output type DC/DC converter receives the input of supply voltage; the voltage input end of described negative output type DC/DC converter is through described the 5th capacity earth; the voltage input end of described negative output type DC/DC converter also connects the voltage jump end of described negative output type DC/DC converter through described the 3rd inductance; the voltage jump end of described negative output type DC/DC converter also connects the anode of described the 4th stabilivolt and the negative electrode of the 5th stabilivolt respectively through described the 6th electric capacity; the plus earth of described the 4th stabilivolt; the anode of described the 5th stabilivolt is through described the 7th capacity earth; the anode of described the 5th stabilivolt also connects the VGL voltage input end of described DPI interface circuit and the VGL voltage input end of DBI interface circuit; the anode of described the 5th stabilivolt also connects the feedback end of described negative output type DC/DC converter through described the 8th electric capacity; the anode of described the 5th stabilivolt also connects the feedback end of described negative output type DC/DC converter through described second resistance; the feedback end of described negative output type DC/DC converter is also through the described second adjustable resistance ground connection, the earth terminal ground connection of described negative output type DC/DC converter.
10. according to each described lcd panel test circuit of claim 1 to 9, it is characterized in that, also comprise usb circuit, jtag interface circuit and SERIAL interface circuit, the input end of described usb circuit connects the usb data end of described master chip, the input end of described jtag interface circuit connects the JTAG data terminal of described master chip, and the input end of described SERIAL interface circuit connects the SERIAL data terminal of described master chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320195043 CN203232677U (en) | 2013-04-17 | 2013-04-17 | Liquid crystal display test circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320195043 CN203232677U (en) | 2013-04-17 | 2013-04-17 | Liquid crystal display test circuit |
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| CN 201320195043 Expired - Fee Related CN203232677U (en) | 2013-04-17 | 2013-04-17 | Liquid crystal display test circuit |
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| CN (1) | CN203232677U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997743A (en) * | 2017-06-02 | 2017-08-01 | 江苏久正光电有限公司 | A kind of test device of Thin Film Transistor-LCD |
| CN107481652A (en) * | 2017-08-11 | 2017-12-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Ignition detection circuit, resolution ratio acquisition methods, display panel drive method and device |
-
2013
- 2013-04-17 CN CN 201320195043 patent/CN203232677U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997743A (en) * | 2017-06-02 | 2017-08-01 | 江苏久正光电有限公司 | A kind of test device of Thin Film Transistor-LCD |
| CN107481652A (en) * | 2017-08-11 | 2017-12-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Ignition detection circuit, resolution ratio acquisition methods, display panel drive method and device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |