CN210466166U - LCD button regulating circuit board - Google Patents
LCD button regulating circuit board Download PDFInfo
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- CN210466166U CN210466166U CN201921074584.1U CN201921074584U CN210466166U CN 210466166 U CN210466166 U CN 210466166U CN 201921074584 U CN201921074584 U CN 201921074584U CN 210466166 U CN210466166 U CN 210466166U
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- resistor
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Abstract
The utility model relates to the technical field of displays, in particular to a key adjusting circuit board of a liquid crystal display; the display comprises an IC, two triodes, five resistors, two capacitors and a high-voltage package, wherein the IC introduces a required brightness signal (0.42 volt) through a contrast potentiometer, so that a twelfth pin of the IC becomes a contrast control end, meanwhile, the first triode can be regarded as a follower of the second triode, the IC controls the gain of the first triode, and the first triode controls the gain of the second triode, thereby realizing the brightness control of the display.
Description
Technical Field
The utility model belongs to the technical field of the display technique and specifically relates to a LCD button regulating circuit board.
Background
The brightness of the display is usually controlled directly by a potentiometer, and since the potentiometer is essentially a resistor with adjustable resistance, the adjustment of the input voltage of the display directly increases the power consumption.
Disclosure of Invention
To the not enough of prior art, the utility model provides an energy-conserving display regulating circuit.
The technical scheme of the utility model is that:
a LCD button adjusts circuit board which characterized in that: it comprises an IC, two triodes, five resistors, two capacitors and a high-voltage package, wherein, the twelfth pin of the IC is connected with the emitting electrode of the first triode, the base electrode of the first triode is respectively connected with the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected with a 12-volt power supply, the second end of the second resistor is connected with the emitter of the second triode, the base electrode of the second triode is respectively connected with the first end of the third resistor and the negative electrode of the first capacitor, the second end of the third resistor is respectively connected with the first end of the fourth resistor, the first end of the fifth resistor, the first end of the second capacitor and the input end of the high-voltage pack, the output end of the high-voltage pack is connected with the display, and the collector electrode of the first triode, the collector electrode of the second triode, the anode of the first capacitor, the second end of the fourth resistor, the second end of the fifth resistor and the second end of the second capacitor are grounded.
Specifically, the IC is IC 701.
Specifically, the third pin (sampling terminal) of the IC is externally connected to a contrast potentiometer. The contrast potentiometer is an electronic element originally existing in the display, and the potentiometer originally used for directly controlling the brightness of the display is used as a sampling electronic element and is used as a signal end for manually controlling the brightness of the display.
Specifically, the eighth pin and the ninth pin of the IC are externally connected to ground, so that the IC can be protected from overcurrent or short circuit.
Specifically, the high-voltage package comprises a plurality of resistors and diodes which are alternately connected in series to generate anode high voltage.
The utility model has the advantages that: the IC leads in a required brightness signal (0.42 volt) through the contrast potentiometer, so the twelfth pin of the IC becomes a contrast control end, meanwhile, the first triode can be regarded as a follower of the second triode, the IC controls the gain of the first triode, and the first triode controls the gain of the second triode, thereby realizing the brightness control of the display. In addition, the second resistor and the third resistor are used for limiting current, the first resistor is a downward-biased resistor of the first triode, and the two capacitors are used for filtering interference and eliminating self-oscillation.
Drawings
Fig. 1 is a circuit diagram of the present invention;
fig. 2 is an effect diagram of the circuit board manufactured by the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1 and 2, a circuit board for adjusting keys of a liquid crystal display is characterized in that: the high-voltage power supply comprises an IC, two triodes, five resistors, two capacitors and a high-voltage bag, wherein a twelfth pin of the IC is connected with an emitter of a first triode Q1, a base of the first triode Q1 is respectively connected with a first end of a first resistor R1 and a first end of a second resistor R2, a second end of the first resistor R1 is connected with a 12-volt power supply, a second end of a second resistor R2 is connected with an emitter of a second triode Q2, a base of the second triode Q2 is respectively connected with a first end of a third resistor R3 and a negative electrode of a first capacitor C1, a second end of the third resistor R3 is respectively connected with a first end of a fourth resistor R4, a first end of a fifth resistor R5, a first end of a second capacitor C2 and an input end of the high-voltage bag FBT, an output end of the high-voltage bag FBT is connected with a display, a collector of the first triode Q1, a collector of the second triode Q2, a positive electrode of the first capacitor C1, The second terminal of the fourth resistor R4, the second terminal of the fifth resistor R5 and the second terminal of the second capacitor C2 are grounded.
Specifically, the IC is IC 701.
Specifically, the third pin (sampling terminal) of the IC is externally connected to a contrast potentiometer. The contrast potentiometer is an electronic element originally existing in the display, and the potentiometer originally used for directly controlling the brightness of the display is used as a sampling electronic element and is used as a signal end for manually controlling the brightness of the display.
Specifically, the eighth pin and the ninth pin of the IC are externally connected to ground, so that the IC can be protected from overcurrent or short circuit.
Specifically, the high-voltage package comprises a plurality of resistors and diodes which are alternately connected in series to generate anode high voltage. In the embodiment, only one resistor and one diode are adopted, but the resistor and the diode are necessarily selected according to requirements in practical use.
The foregoing embodiments and description have been provided to illustrate the principles and preferred embodiments of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.
Claims (5)
1. A LCD button adjusts circuit board which characterized in that: it comprises an IC, two triodes, five resistors, two capacitors and a high-voltage package, wherein, the twelfth pin of the IC is connected with the emitting electrode of the first triode, the base electrode of the first triode is respectively connected with the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected with a 12-volt power supply, the second end of the second resistor is connected with the emitter of the second triode, the base electrode of the second triode is respectively connected with the first end of the third resistor and the negative electrode of the first capacitor, the second end of the third resistor is respectively connected with the first end of the fourth resistor, the first end of the fifth resistor, the first end of the second capacitor and the input end of the high-voltage pack, the output end of the high-voltage pack is connected with the display, and the collector electrode of the first triode, the collector electrode of the second triode, the anode of the first capacitor, the second end of the fourth resistor, the second end of the fifth resistor and the second end of the second capacitor are grounded.
2. The LCD key adjustment circuit board of claim 1, wherein: the IC is IC 701.
3. The LCD key adjustment circuit board of claim 1, wherein: and a third pin of the IC is externally connected with a contrast potentiometer.
4. The LCD key adjustment circuit board of claim 1, wherein: and the eighth pin and the ninth pin of the IC are externally connected with the ground.
5. The LCD key adjustment circuit board of claim 1, wherein: the high-voltage package comprises a plurality of resistors and diodes which are alternately connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074584.1U CN210466166U (en) | 2019-07-10 | 2019-07-10 | LCD button regulating circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921074584.1U CN210466166U (en) | 2019-07-10 | 2019-07-10 | LCD button regulating circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210466166U true CN210466166U (en) | 2020-05-05 |
Family
ID=70444800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921074584.1U Active CN210466166U (en) | 2019-07-10 | 2019-07-10 | LCD button regulating circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210466166U (en) |
-
2019
- 2019-07-10 CN CN201921074584.1U patent/CN210466166U/en active Active
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