CN220105459U - Automatic measuring device for optimal contrast of LCD - Google Patents
Automatic measuring device for optimal contrast of LCD Download PDFInfo
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- CN220105459U CN220105459U CN202321218708.5U CN202321218708U CN220105459U CN 220105459 U CN220105459 U CN 220105459U CN 202321218708 U CN202321218708 U CN 202321218708U CN 220105459 U CN220105459 U CN 220105459U
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- 239000003990 capacitor Substances 0.000 claims description 57
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses an automatic measuring device for the optimal contrast of an LCD, which relates to the technical field of automatic contrast measurement, and comprises an STC8 single-chip microcomputer control board, a screen brightness meter, an information display screen and a rack for placing an LCD module to be tested, wherein the STC8 single-chip microcomputer control board is connected with the screen brightness meter, and the output end of the STC8 single-chip microcomputer control board is respectively connected with the input end of the information display screen and the input end of the LCD module to be tested; the utility model adopts the singlechip of STC8, and measures the contrast parameter of the LCD by cleaning the screen and displaying the picture for the test LCD module, then adjusting the contrast of the LCD by the auxiliary software, and simultaneously obtaining the feedback data of the contrast from the screen brightness meter.
Description
Technical Field
The utility model relates to the technical field of automatic contrast measurement, in particular to an automatic measuring device for optimal contrast of an LCD.
Background
In the LCD production process, the display contrast VOP of the LCD display screen has slight difference in contrast of the single LCD display screen in batch because of the production process, and the consistency is difficult to achieve.
The LCD module is at the customer end, and customer requires that the contrast ratio of LCD is consistent, can not appear the contrast ratio of LCD in a lot, and is high, and is low. This requires LCD manufacturers to modify circuit elements to adjust the contrast to uniformity in the module driving circuit when producing the module using the LCD.
At present, when the contrast of the LCD is different, the engineer manually modifies the parameters of the driving circuit on the production line aiming at the LCD with problems, and human eyes judge whether the regulated VOP is qualified or not.
Because of the manual participation judging link, each judgment is not very accurate and complicated.
Disclosure of Invention
The utility model aims to solve the technical problem of the background technology and provides an LCD optimal contrast automatic measuring device, which removes a manual adjusting circuit element and does not need a standard that staff judges the contrast by naked eyes. The manual adjustment and the judgment of the intermediate link are fully automatically realized by a machine.
The utility model adopts the following technical scheme for solving the technical problems:
the automatic LCD optimal contrast measuring device comprises an STC8 single-chip microcomputer control board, a screen brightness meter, an information display screen and a rack for placing an LCD module to be tested, wherein the STC8 single-chip microcomputer control board is connected with the screen brightness meter, and the output end of the STC8 single-chip microcomputer control board is respectively connected with the input end of the information display screen and the input end of the LCD module to be tested;
the STC8 singlechip control board contains chip U5, resistance R13, resistance R14, electric capacity C36 and 3.3V voltage end, and the one end of resistance R14 is connected to the pin 13 of chip U5, and the one end of resistance R13 and the one end of electric capacity C36 are connected respectively to the other end of resistance R14, and 3.3V voltage end is connected to the other end of resistance R13, and electric capacity C36's the other end ground connection.
As a further preferable scheme of the LCD optimal contrast automatic measuring device, the device also comprises a DC-DC power supply, wherein the DC-DC power supply is connected with the STC8 singlechip control board and is used for providing required electric energy.
As a further preferable scheme of the LCD optimal contrast automatic measuring device, the DC-DC power supply comprises a 12V voltage input end, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, an inductor L2, an inductor L3, a resistor R1, a resistor R2, a chip U1, a voltage stabilizing diode D1, a chip U2 and a 3.3V voltage output end,
the 12V voltage input end is respectively connected with one end of a capacitor C10 and a pin 1 of a chip U1, the other end of the capacitor C10 is respectively connected with a pin 3 of the chip U1 and a pin 5 of the chip U1 and is grounded, a pin 2 of the chip U1 is respectively connected with a cathode of a voltage stabilizing diode D1 and one end of an inductor L2, an anode of the voltage stabilizing diode D1 is grounded, the other end of the inductor L2 is respectively connected with a pin 4 of the chip U1, one end of a capacitor C11, one end of a capacitor C12, one end of a capacitor C13, the pin 4 of the chip U2 and the pin 1 of the chip U2, the cathode of the voltage stabilizing diode D1, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively grounded, a pin 3 of the chip U2 is connected with one end of a resistor R1, one end of a resistor R2 and one end of a capacitor C15, the other end of the inductor L3 is respectively connected with one end of a capacitor C14, the other end of the resistor R1 and the other end of the capacitor C14 is connected with the other end of the resistor R2 in parallel to the ground.
As a further preferable embodiment of the LCD optimum contrast automatic measuring apparatus of the present utility model, the chip type of the chip U5 is STC8A8K64S4a12.
As a further preferable mode of the LCD optimal contrast automatic measuring device, the chip model of the chip U1 is LM2596HVS-ADJ.
As a further preferable embodiment of the LCD optimum contrast automatic measuring apparatus of the present utility model, the chip U2 has a chip model TD6817TR.
As a further preferable mode of the LCD optimal contrast automatic measuring device, the chip model of the screen brightness meter is ST-86LA.
Compared with the prior art, the technical scheme provided by the utility model has the following technical effects:
the utility model relates to an LCD optimal contrast automatic measuring device, which adopts a singlechip of STC8, and measures contrast parameters of LCD by cleaning screen and full display picture of a test LCD module, then adjusting contrast of LCD by auxiliary group software, and simultaneously obtaining feedback data of contrast from a screen brightness meter (ST-86 LA); after the singlechip of STC8 automatically judges that the contrast ratio is tested, calculating corresponding parameters through software; calculating the current contrast value and the optimal contrast value of the LCD module, and needing no adjustment of the contrast parameter of the LCD module and how to adjust the contrast parameter; the contrast test and judgment of the whole LCD module are automatically realized through software, so that manual operation is greatly reduced, the production efficiency is improved, and the product quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of an LCD optimum contrast ratio automatic measuring device according to the present utility model;
FIG. 2 is a circuit diagram of the STC8 single-chip microcomputer control board of the utility model;
fig. 3 is a circuit diagram of the DC-DC power supply of the present utility model.
Detailed Description
The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings:
in order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
To ameliorate the deficiencies of the LCD contrast adjustment schemes currently in production. The utility model provides an LCD optimal contrast automatic measuring device, which eliminates manual adjusting circuit elements and does not need staff to judge contrast standard by naked eyes. The manual adjustment and the judgment of the intermediate link are fully automatically realized by a machine.
The utility model aims to solve a core problem, and how to enable the device to automatically judge whether the adjusted contrast parameter is proper or not. Because the direct feedback of the contrast ratio of the liquid crystal on the display screen is the depth of the display lattice, and the accurate measurement of the depth change of the display lattice is most commonly used to use a screen brightness meter.
The screen brightness meter is a common device for liquid crystal display manufacturing enterprises. The conventional screen brightness meter only displays brightness parameters through a liquid crystal screen, and has no brightness parameter output interface. The utility model needs to take out the brightness parameter of the screen brightness meter as the contrast judgment basis of the display screen. In order to obtain the brightness parameter of the screen brightness meter, the utility model is realized by adopting the following method.
In order to obtain the brightness parameter of the brightness meter, the scheme uses a ready-made screen brightness meter (ST-86 LA), a screen brightness meter host is disassembled, a singlechip of STC8 is adopted, the voltage of a liquid crystal drive ICL7106 analog input end of the screen brightness meter host is directly read by an IO port with an ADC function, and the contrast change of a display screen can be measured through the difference of the obtained voltage parameters.
In order to make the staff clearly know the working details of the device when operating the LCD optimal contrast automatic measuring device, an information display screen is specially configured for the device. Through the information display screen, staff can intuitively and timely master the working state and the equipment condition, and the usability of the device is greatly improved.
An LCD optimal contrast automatic measuring device is shown in figure 1, and comprises an STC8 single-chip microcomputer control board, a screen brightness meter, an information display screen and a rack for placing an LCD module to be tested, wherein the STC8 single-chip microcomputer control board is connected with the screen brightness meter, and the output end of the STC8 single-chip microcomputer control board is respectively connected with the input end of the information display screen and the input end of the LCD module to be tested;
the utility model adopts the singlechip of STC8, and measures the contrast parameter of the LCD by cleaning the screen of the test LCD module and displaying the picture entirely, then adjusting the contrast of the LCD by the auxiliary software, and simultaneously acquiring the feedback data of the contrast from a screen brightness meter (ST-86 LA). After the single chip microcomputer of STC8 automatically judges that the contrast ratio is tested, corresponding parameters are calculated through software. The current contrast value, the optimal contrast value, and the contrast parameters of the LCD module that do not need to be adjusted, and how to adjust, are calculated. The contrast test and judgment of the whole LCD module are automatically realized through software, so that manual operation is greatly reduced, the production efficiency is improved, and the product quality is improved.
The detailed working process is as follows:
firstly, placing an LCD module to be tested on an LCD optimal contrast automatic measuring device, cleaning a test picture by a singlechip control board of STC8, and measuring a contrast parameter reference value 1 by using a screen brightness meter (ST-86 LA).
And secondly, keeping the test picture clear by using a singlechip control board of STC8, adjusting the contrast of the tested LCD module to the minimum, and measuring a contrast parameter reference value 2 by using a screen brightness meter (ST-86 LA).
And thirdly, fully displaying the test picture through a singlechip control board of STC8, recovering the initial contrast of the LCD module, and measuring the contrast parameter reference value 3 by using a screen brightness meter (ST-86 LA).
And fourthly, fully displaying the test picture through a singlechip control board of STC8, adjusting the contrast of the tested LCD module to the highest, and measuring the contrast parameter reference value 4 by using a screen brightness meter (ST-86 LA).
By measuring the above 4 parameters, the current contrast ratio, and the optimal contrast ratio value of the LCD module to be tested can be obtained quickly and accurately. According to the difference value of the continuous data, the adjustment parameters of the adjustment circuit can be rapidly determined.
In each operation link, the information display screen can timely display corresponding information, and details of the device work are intuitively displayed.
As shown in FIG. 2, the STC8 SCM control board comprises a chip U5, a resistor R13, a resistor R14, a capacitor C36 and a 3.3V voltage end, a pin 13 of the chip U5 is connected with one end of the resistor R14, the other end of the resistor R14 is respectively connected with one end of the resistor R13 and one end of the capacitor C36, the other end of the resistor R13 is connected with the 3.3V voltage end, and the other end of the capacitor C36 is grounded.
The power supply also comprises a DC-DC power supply, and the DC-DC power supply is connected with the STC8 singlechip control board and used for providing required electric energy.
As shown in fig. 3, the DC-DC power supply includes a 12V voltage input terminal, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, an inductor L2, an inductor L3, a resistor R1, a resistor R2, a chip U1, a zener diode D1, a chip U2, and a 3.3V voltage output terminal,
the 12V voltage input end is respectively connected with one end of a capacitor C10 and a pin 1 of a chip U1, the other end of the capacitor C10 is respectively connected with a pin 3 of the chip U1 and a pin 5 of the chip U1 and is grounded, a pin 2 of the chip U1 is respectively connected with a cathode of a voltage stabilizing diode D1 and one end of an inductor L2, an anode of the voltage stabilizing diode D1 is grounded, the other end of the inductor L2 is respectively connected with a pin 4 of the chip U1, one end of a capacitor C11, one end of a capacitor C12, one end of a capacitor C13, the pin 4 of the chip U2 and the pin 1 of the chip U2, the cathode of the voltage stabilizing diode D1, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively grounded, a pin 3 of the chip U2 is connected with one end of a resistor R1, one end of a resistor R2 and one end of a capacitor C15, the other end of the inductor L3 is respectively connected with one end of a capacitor C14, the other end of the resistor R1 and the other end of the capacitor C14 is connected with the other end of the resistor R2 in parallel to the ground.
Preferably, the chip type of the chip U5 is STC8A8K64S4A12.
Preferably, the chip model of the chip U1 is LM2596HVS-ADJ.
Preferably, the chip type of the chip U2 is TD6817TR.
Preferably, the chip model of the screen brightness meter is ST-86LA.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.
Claims (5)
1. An automatic measuring device for the optimal contrast of an LCD is characterized in that: the LCD module comprises an STC8 single-chip microcomputer control board, a screen brightness meter, an information display screen and a rack for placing an LCD module to be tested, wherein the STC8 single-chip microcomputer control board is connected with the screen brightness meter, and the output end of the STC8 single-chip microcomputer control board is respectively connected with the input end of the information display screen and the input end of the LCD module to be tested;
the STC8 singlechip control board comprises a chip U5, a resistor R13, a resistor R14, a capacitor C36 and a 3.3V voltage end, a pin 13 of the chip U5 is connected with one end of the resistor R14, the other end of the resistor R14 is respectively connected with one end of the resistor R13 and one end of the capacitor C36, the other end of the resistor R13 is connected with the 3.3V voltage end, and the other end of the capacitor C36 is grounded; the system also comprises a DC-DC power supply, wherein the DC-DC power supply is connected with the STC8 singlechip control board and is used for providing required electric energy; the DC-DC power supply comprises a 12V voltage input end, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, an inductor L2, an inductor L3, a resistor R1, a resistor R2, a chip U1, a zener diode D1, a chip U2 and a 3.3V voltage output end,
the 12V voltage input end is respectively connected with one end of a capacitor C10 and a pin 1 of a chip U1, the other end of the capacitor C10 is respectively connected with a pin 3 of the chip U1 and a pin 5 of the chip U1 and is grounded, a pin 2 of the chip U1 is respectively connected with a cathode of a voltage stabilizing diode D1 and one end of an inductor L2, an anode of the voltage stabilizing diode D1 is grounded, the other end of the inductor L2 is respectively connected with a pin 4 of the chip U1, one end of a capacitor C11, one end of a capacitor C12, one end of a capacitor C13, the pin 4 of the chip U2 and the pin 1 of the chip U2, the cathode of the voltage stabilizing diode D1, the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively grounded, a pin 3 of the chip U2 is connected with one end of a resistor R1, one end of a resistor R2 and one end of a capacitor C15, the other end of the inductor L3 is respectively connected with one end of a capacitor C14, the other end of the resistor R1 and the other end of the capacitor C14 is connected with the other end of the resistor R2 in parallel to the ground.
2. The LCD optimum contrast automatic measuring apparatus according to claim 1, wherein: the chip type of the chip U5 is STC8A8K64S4A12.
3. The LCD optimum contrast automatic measuring apparatus according to claim 1, wherein: the chip model of the chip U1 is LM2596HVS-ADJ.
4. The LCD optimum contrast automatic measuring apparatus according to claim 1, wherein: the chip type of the chip U2 is TD6817TR.
5. The LCD optimum contrast automatic measuring apparatus according to claim 1, wherein: the chip model of the screen brightness meter is ST-86LA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321218708.5U CN220105459U (en) | 2023-05-19 | 2023-05-19 | Automatic measuring device for optimal contrast of LCD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321218708.5U CN220105459U (en) | 2023-05-19 | 2023-05-19 | Automatic measuring device for optimal contrast of LCD |
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| Publication Number | Publication Date |
|---|---|
| CN220105459U true CN220105459U (en) | 2023-11-28 |
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| CN202321218708.5U Active CN220105459U (en) | 2023-05-19 | 2023-05-19 | Automatic measuring device for optimal contrast of LCD |
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| CN (1) | CN220105459U (en) |
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- 2023-05-19 CN CN202321218708.5U patent/CN220105459U/en active Active
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