CN109407356B - Power-on voltage-stabilizing power supply system and method for display screen - Google Patents
Power-on voltage-stabilizing power supply system and method for display screen Download PDFInfo
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- CN109407356B CN109407356B CN201710707483.2A CN201710707483A CN109407356B CN 109407356 B CN109407356 B CN 109407356B CN 201710707483 A CN201710707483 A CN 201710707483A CN 109407356 B CN109407356 B CN 109407356B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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Abstract
The invention discloses a power-on voltage-stabilizing power supply system and a power-on voltage-stabilizing power supply method for a display screen. The power supply system for the display screen comprises: the system comprises a main control chip, a power management chip and a voltage acquisition chip; the voltage acquisition chip is used for performing voltage sampling of the display screen terminal to acquire the voltage of the display screen terminal and sending the acquired voltage value of the display screen terminal to the main control chip; the main control chip is used for sending a power output instruction signal to the power management chip according to the voltage setting parameter or the display screen terminal voltage value received from the voltage acquisition chip; the power supply management chip is used for executing power supply output to the display screen according to the power supply output instruction signal received from the main control chip so as to provide power supply voltage for the display screen.
Description
Technical Field
The invention relates to the field of liquid crystal LCM module testing, in particular to a display screen power-on voltage-stabilizing power supply system and a display screen power-on voltage-stabilizing power supply method.
Background
When the LCM (LCD module) module (LCD display module) is completed, a lighting test is required. The lighting of the module requires strict power-up timing and voltage requirements.
However, the current lighting devices are not directly connected to the screen, and are all at a distance from the screen. In this case, the problem of line loss becomes troublesome; specifically, lighting causes various problems due to the environment, wires, line length, and the like.
In order to solve the problem of abnormal lighting due to line loss, a raising voltage is generally appropriately set according to actual conditions. However, raising the voltage at one glance also increases the risk of burn-in.
Therefore, those skilled in the art have made an effort to develop a technical solution capable of solving the problem of abnormal lighting due to line loss without increasing the risk of screen burn-in.
Disclosure of Invention
In view of the foregoing defects in the prior art, an object of the present invention is to provide a power-on voltage-stabilizing power supply system and a power-on voltage-stabilizing power supply method for a display screen, which can solve the problem of abnormal lighting due to line loss without increasing the risk of screen burning.
In order to achieve the above object, the present invention provides an electric voltage-stabilizing power supply system for a display screen, comprising: the system comprises a main control chip, a power management chip and a voltage acquisition chip; the voltage acquisition chip is used for performing voltage sampling of the display screen terminal to acquire the voltage of the display screen terminal and sending the acquired voltage value of the display screen terminal to the main control chip; the main control chip is used for sending a power output instruction signal to the power management chip according to the voltage setting parameter or the display screen terminal voltage value received from the voltage acquisition chip; the power supply management chip is used for executing power supply output to the display screen according to the power supply output instruction signal received from the main control chip so as to provide power supply voltage for the display screen.
Preferably, the main control chip sends a power output instruction signal for increasing the power voltage provided to the display screen to the power management chip when the received voltage value of the terminal of the display screen is lower than a predetermined voltage threshold value.
Further preferably, the rise value when the power supply voltage to be supplied to the display screen rises is determined according to a difference value obtained by subtracting the display screen terminal voltage value received from the voltage acquisition chip from a predetermined voltage threshold value.
Preferably, the main control chip sends a power output instruction signal to the power management chip to reduce the power voltage supplied to the display screen when the received voltage value of the terminal of the display screen is higher than the predetermined voltage threshold by more than a predetermined difference value.
Preferably, the predetermined voltage threshold is a display screen termination voltage rating.
Preferably, the display screen is an LCD display screen.
In order to achieve the above object, the present invention further provides a method for supplying power to a display screen by voltage stabilization, comprising:
the first step is as follows: before the voltage acquisition chip outputs power, the voltage acquisition chip executes primary initialization voltage acquisition and sends an acquisition result to the main control chip to calibrate a measurement result;
the second step is as follows: after receiving the voltage setting parameters, the main control chip controls the power supply output of the power supply management chip according to the voltage setting parameters so as to electrify the system;
the third step: continuously performing display screen terminal voltage sampling by using a voltage acquisition chip to acquire terminal voltage;
the fourth step: and judging whether the voltage value of the terminal of the display screen is lower than a preset voltage threshold value, and if the voltage value of the terminal of the display screen is lower than the preset voltage threshold value, the power supply management chip raises the power supply voltage provided for the display screen.
Preferably, the rising value when the power supply voltage to be supplied to the display screen rises is determined according to a difference value obtained by subtracting the display screen terminal voltage value received from the voltage acquisition chip from a predetermined voltage threshold value.
Preferably, the display screen is an LCD display screen.
The invention can well solve the problem of power loss from the source end to the terminal caused by long line running under the condition of not increasing the risk of screen burning, so as to provide the most appropriate power for lighting and improve the lighting effect of the lighting equipment.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
fig. 1 is a schematic diagram of functional modules of an electrical regulated power supply system on a display screen according to a preferred embodiment of the present invention.
Fig. 2 is a flowchart of a voltage-stabilized power supply method for a display screen according to a preferred embodiment of the invention.
It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.
Detailed Description
Fig. 1 is a schematic diagram of functional modules of an electrical regulated power supply system on a display screen according to a preferred embodiment of the present invention.
As shown in fig. 1, the power supply system for voltage stabilization on a display screen according to the preferred embodiment of the present invention includes: the device comprises a main control chip 1, a power management chip 2 and a voltage acquisition chip 3.
The voltage acquisition chip 3 is used for performing display screen terminal voltage sampling to acquire display screen terminal voltage and sending the acquired display screen terminal voltage value to the main control chip 1; the main control chip 1 is used for sending a power output instruction signal to the power management chip 2 according to the voltage setting parameter or the display screen terminal voltage value received from the voltage acquisition chip 3; the power management chip 2 is used for executing power output to the display screen according to the power output instruction signal received from the main control chip 1 so as to provide power voltage to the display screen.
Specifically, the main control chip 1 sends a power output instruction signal for boosting the power voltage supplied to the display screen to the power management chip 2 when the received display screen terminal voltage value is lower than a predetermined voltage threshold value (for example, the predetermined voltage threshold value is a display screen terminal voltage rating).
Further, a rise value at which the power supply voltage to be supplied to the display screen rises is determined based on a difference value obtained by subtracting the display screen terminal voltage value received from the voltage acquisition chip 3 from a predetermined voltage threshold value.
Also, the main control chip 1 transmits a power output instruction signal to reduce the power supplied to the display screen to the power management chip 2 when the received display screen terminal voltage value is higher than a predetermined voltage threshold value (for example, the predetermined voltage threshold value is a display screen terminal voltage rating value) by more than a predetermined difference value.
For example, the display screen is an LCD display screen.
That is, the main control chip 1 is a control unit of the entire system. The system is responsible for setting the voltage required by lighting, and simultaneously, the voltage of the terminal is collected in real time so as to compensate the power loss on the line. The power management chip 2 is built by a mature power management chip, and forms closed-loop control with the main control chip and the surrounding voltage sampling chips so as to ensure the stability of power output. The voltage acquisition chip 3 is used for acquiring the terminal voltage. Because the line loss of the power supply is caused by the existence of line resistance in the whole loop, once the current flows through, the voltage drop is generated, and the voltage output from the source end is less than that of the source end after the voltage is output to the terminal. And the terminal is used for sampling and then returns to the path of the voltage sampling chip, and because the input resistance of the voltage sampling chip is very high, no voltage drop exists. Therefore, the system can know the accurate voltage value of the terminal at the moment so as to adjust the power supply.
According to the power-on voltage-stabilizing power supply system of the display screen, the problem of power loss from a source end to a terminal caused by long line running can be well solved under the condition that the risk of screen burning is not increased, so that the most appropriate power supply is provided for lighting, and the lighting effect of the lighting equipment is improved.
Fig. 2 is a flowchart of a voltage-stabilized power supply method for a display screen according to a preferred embodiment of the invention. For example, the power-on voltage-stabilized power supply method for the display screen according to the preferred embodiment of the present invention shown in fig. 2 may adopt the power-on voltage-stabilized power supply system for the display screen according to the preferred embodiment of the present invention shown in fig. 1.
Specifically, as shown in fig. 2, the power-on voltage-stabilizing power supply method for a display screen according to the preferred embodiment of the present invention includes:
first step S1: before the voltage acquisition chip 3 outputs power (i.e. before the system is powered on first), the voltage acquisition chip 3 executes primary initialization voltage acquisition and sends an acquisition result to the main control chip 1 for calibrating a measurement result; specifically, the voltage value DA1 obtained at this time is static power consumption in the initial state, and can be used for calibration of later acquired values.
Second step S2: after receiving the voltage setting parameters, the main control chip 1 controls the power output of the power management chip 2 according to the voltage setting parameters so as to power on the system; and then, closed-loop regulation is carried out through a power supply sampling chip of the acquisition source end until the power supply output is stable and an accurate set value is obtained. At this time, the output flag bit of the power supply may be set to indicate that the system source power supply has been adjusted.
The voltage output by the power management chip 2 is the voltage required by the display screen. For example, if the required 3.3V voltage of the screen is output, the controller will first regulate the power chip to output a stable 3.3V. At this point, the adjusted flag is set. But due to on-line losses, the termination voltage is now below 3.3V.
Third step S3: continuously performing display screen terminal voltage sampling by using the voltage acquisition chip 3 to acquire terminal voltage; if the voltage used by the path has a large current when lighting up, the value acquired by the terminal voltage at the moment is smaller than the source end voltage due to the on-line impedance. With a loop through which no current flows, there is no voltage drop across the loop. Therefore, the sampling chip of the source end can accurately acquire the power supply condition of the terminal.
For example, when it is detected that the power-on flag is set, the system performs terminal voltage acquisition. Since the current is not passed through the line, the terminal voltage DA2 can be accurately detected.
Fourth step S4: and judging whether the voltage value of the terminal of the display screen is lower than a preset voltage threshold value, and if the voltage value of the terminal of the display screen is lower than the preset voltage threshold value, the power supply management chip 2 raises the power supply voltage provided for the display screen.
For example, the values obtained by DA2-DA1 are actual voltage adjustment values. At this time, if the voltage of the terminal is smaller than the set threshold (e.g. 3.2V), the terminal compensation is performed by appropriately raising the voltage at this time; if above the threshold voltage, the power supply may be shut down for troubleshooting, for example.
Since the third step S3 continuously performs the display screen terminal voltage sampling using the voltage acquisition chip 3 to acquire the terminal voltage, the acquired value and the first acquired value are processed after the fourth step S4 to obtain the accurate voltage value of the terminal, and then the accurate voltage value is compared with the set power value. And if the voltage is smaller than the threshold value, performing boosting operation. And then the operation is executed circularly until the current power output is accurately sent to the terminal.
According to the power-on voltage-stabilizing power supply method for the display screen, the problem of power loss from the source end to the terminal due to long line running can be well solved under the condition that the risk of screen burning is not increased, so that the most appropriate power supply is provided for lighting, and the lighting effect of the lighting equipment is improved.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a be applied to power-on steady voltage power supply system of liquid crystal display module test of lighting a lamp which characterized in that includes: the system comprises a main control chip, a power management chip and a voltage acquisition chip; the voltage acquisition chip is used for performing voltage sampling of the display screen terminal to acquire the voltage of the display screen terminal and sending the acquired voltage value of the display screen terminal to the main control chip; the main control chip is used for sending a power output instruction signal to the power management chip according to the voltage setting parameter or the display screen terminal voltage value received from the voltage acquisition chip; the power supply management chip is used for executing power supply output to the display screen according to the power supply output instruction signal received from the main control chip so as to provide power supply voltage for the display screen.
2. The power-on voltage-stabilizing power supply system applied to the lighting test of the liquid crystal display module as claimed in claim 1, wherein the main control chip sends a power output instruction signal for raising the power voltage provided to the display screen to the power management chip when the received voltage value of the terminal of the display screen is lower than the predetermined voltage threshold.
3. The power-on voltage-stabilizing power supply system for the lighting test of the liquid crystal display module as claimed in claim 2, wherein the rising value when the power voltage supplied to the display screen rises is determined according to the difference value obtained by subtracting the voltage value of the terminal of the display screen received from the voltage acquisition chip from the predetermined voltage threshold.
4. The power-on voltage-stabilizing power supply system applied to the lighting test of the liquid crystal display module as claimed in claim 1 or 2, wherein the main control chip sends a power output instruction signal for reducing the power voltage provided to the display screen to the power management chip when the received voltage value of the terminal of the display screen is higher than the predetermined voltage threshold by more than a predetermined difference value.
5. The power-on voltage-stabilized power supply system for the lighting test of the liquid crystal display module as claimed in claim 2, wherein the predetermined voltage threshold is a terminal voltage rating of the display panel.
6. A power-on voltage-stabilizing power supply method applied to a liquid crystal display module lighting test is characterized by comprising the following steps:
the first step is as follows: before the system is powered on firstly, the voltage acquisition chip executes initialization voltage acquisition once and sends an acquisition result to the main control chip to calibrate a measurement result;
the second step is as follows: after receiving the voltage setting parameters, the main control chip controls the power supply output of the power supply management chip according to the voltage setting parameters so as to electrify the system;
the third step: continuously performing display screen terminal voltage sampling by using a voltage acquisition chip to acquire terminal voltage;
the fourth step: the main control chip receives a voltage value of a display screen terminal from the voltage acquisition chip, and if the voltage value of the display screen terminal is lower than a preset voltage threshold, the power supply voltage provided by the power supply management chip to the display screen is increased; or, if the display screen terminal voltage value is higher than the preset voltage threshold value, the power supply voltage provided by the power supply management chip to the display screen is reduced.
7. The power-on voltage-stabilizing power supply method applied to the lighting test of the liquid crystal display module as claimed in claim 6, wherein the rising value when the power voltage supplied to the display screen rises is determined according to the difference value obtained by subtracting the voltage value of the terminal of the display screen received from the voltage acquisition chip from the predetermined voltage threshold.
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| CN201710707483.2A CN109407356B (en) | 2017-08-17 | 2017-08-17 | Power-on voltage-stabilizing power supply system and method for display screen |
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| CN113257170B (en) * | 2021-06-17 | 2021-09-24 | 深圳市新龙鹏科技有限公司 | TypeC device power correction method, device, equipment and storage medium |
| CN114116371A (en) * | 2021-10-09 | 2022-03-01 | 北京比特大陆科技有限公司 | Voltage monitoring method and device, electronic equipment and storage medium |
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