KR20110096930A - High-brightness monitor auto temperature control system - Google Patents

High-brightness monitor auto temperature control system Download PDF

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Publication number
KR20110096930A
KR20110096930A KR1020100016497A KR20100016497A KR20110096930A KR 20110096930 A KR20110096930 A KR 20110096930A KR 1020100016497 A KR1020100016497 A KR 1020100016497A KR 20100016497 A KR20100016497 A KR 20100016497A KR 20110096930 A KR20110096930 A KR 20110096930A
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KR
South Korea
Prior art keywords
temperature
brightness
backlight
panel
led
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Application number
KR1020100016497A
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Korean (ko)
Inventor
배종철
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(주)지에스디
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Priority to KR1020100016497A priority Critical patent/KR20110096930A/en
Publication of KR20110096930A publication Critical patent/KR20110096930A/en

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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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • G02F1/133385—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell with cooling means, e.g. fans
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention is a system for automatically controlling the temperature of the high brightness TFT-LCD panel 40, more specifically, the temperature sensor 10 installed in the panel detects the temperature of the equipment in real time, the detected temperature data is a monitor board ( 20). The monitor board compares the temperature of the TFT-LCD panel with the initially set value based on the transmitted temperature data, and when the temperature exceeds the range of the set value, a cooling fan installed outside the panel to lower the temperature by hardware means (50). ), The software means sends a signal to the backlight control board 30 to adjust the brightness of the LED to lower and lower the brightness of the LED by lowering the brightness of the screen by increasing the contrast ratio Minimize user inconvenience. After changing the setting, if the panel temperature is detected and the initially set value is reached, the changed contents are changed to the initially set value. The present invention is to prevent the shortening of the life and safety of the equipment due to the temperature rise of the TFT-LCD panel, the black out that the screen turns black when used for a long time, it generates heat than installing a common heat sink The purpose is to control the temperature by adjusting the brightness of the backlight LED, which is a fundamental factor of the. It also manages by increasing the contrast ratio of the screen to minimize the display screen darkened by lowering the brightness of the LED, it is possible to automatically control the panel temperature while minimizing user inconvenience.

Description

High-Brightness Monitor Auto Temperature Control System

The present invention relates to a temperature control system of a high-brightness monitor product, and more particularly, to damage of a device due to an increase in the number of LEDs or an increase in the internal temperature of the display equipment due to prolonged use for a high-brightness screen of a display device installed outdoors. As a technology to prevent the damage, the temperature of the display equipment installed outdoors is sensed in real time and transmitted to the monitor board.As a hardware means to lower the temperature when the temperature rises, a cooling fan is installed outside the screen of the TFT-LCD panel. The temperature rise from external environmental factors is reduced, and the software means sends a signal to the backlight control board based on the transmitted temperature data to lower the brightness of the LED and lower the brightness of the LED. To compensate for losing It is a high-brightness monitor automatic temperature control system that can adjust the temperature of the display equipment while minimizing visual changes to the user by adjusting upward.

As the information society develops, the display screen equipments are variously developed as users' demand for display equipments is increased. Typically, liquid crystal displays (hereinafter referred to as "LCDs"), plasma display panels (PDPs), vacuum fluorescent displays (VFDs), and the like are used. Among them, LCD is the most widely used, and recently, a thin film transistor liquid crystal display device (Thin Film Transistor LCD, hereinafter referred to as 'TFT-LCD') is used a lot. TFT-LCD is used for mobile image display equipment because of its advantages of light weight and low power consumption along with the advantages of existing LCD, and it is used for the panel outside the building and requires high brightness display equipment. Was done. The LCD applies an electric field to the liquid crystal layer, and adjusts the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer to obtain a desired screen. At this time, the light may be natural light or artificial light source provided separately. In addition, the operating characteristics of the circuit elements mounted to drive the LCD are also affected by the temperature, and thus the operating characteristics are changed depending on the temperature. In order to drive the sensor, it is necessary to detect and control the temperature change of the LCD due to the heat generated from the surrounding environment or the inside. High brightness display can be achieved by increasing the number of backlight units used as backlights. In this case, when the temperature of the TFT-LCD panel rises due to the external environmental factors and the internal temperature increase caused by the use of multiple backlight units, Shortening lifespan, safety issues, and blackouts that can cause the display screen to turn black after prolonged use. Conventionally, in order to solve this problem, in order to lower the temperature of the TFT-LCD panel, heat sinks are installed when turning on a plurality of backlight units. Cause It does not solve. In addition, if the number of backlight units is reduced to lower the temperature, the display screen becomes dark, causing user dissatisfaction.

There are problems such as shortening the lifespan and safety of the equipment due to the rise of the temperature of the TFT-LCD panel, and a black out which causes the display screen to turn black due to long time use. Based on the data, it is necessary to control the temperature of the TFT-LCD panel without user inconvenience by adjusting the brightness of the backlight LED and the contrast ratio of the screen.

The present invention is a high-brightness monitor automatic temperature control system for solving the above problems, which is designed to solve the problems caused by the temperature rise of the panel installed outdoors, by using a temperature sensor to detect the temperature of the panel in real time, Transmitting the detected temperature data to the monitor board and sending a signal to the backlight control board when the temperature rises compared to the initial set temperature to adjust the brightness of the LED and adjust the contrast ratio of the screen accordingly to reduce the temperature of the backlight LED It is characterized by minimizing the inconvenience, and also to install a cooling fan to reduce the temperature rise of the panel due to external factors.

The present invention is to adjust the brightness of the LED down to solve the heat problem of the backlight unit which is the main factor of the temperature rise when the temperature rise of the high-brightness TFT-LCD panel installed outdoors, and also to reduce the brightness of the LED It is possible to control the panel temperature while minimizing user's inconvenience by adjusting the contrast ratio of the display screen to solve the darkness, and controlling the temperature of the TFT-LCD panel by detecting the temperature sensor in real time even during long time use. In addition, it is possible to reduce the temperature rise of the panel due to external factors by additionally installing a cooling fan outside the TFT-LCD panel.

1 is an overall configuration diagram of a high brightness monitor automatic temperature control system according to the present invention.
2 is a flowchart of a high brightness monitor automatic temperature control system according to the present invention.
3A to 3F are circuit diagrams of a high brightness monitor automatic temperature control system according to the present invention.

Hereinafter, exemplary embodiments of a high brightness monitor automatic temperature control system will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a high brightness monitor automatic temperature control system according to the present invention.

As shown in Figure 1, the high brightness monitor automatic temperature control system,

A temperature sensor 10 for sensing the surface temperature of the TFT-LCD panel 40;

When the surface temperature of the panel sensed by the temperature sensor 10 exceeds the initial setting range, the signal controlling the operation of the cooling fan 50 installed outside the panel and the brightness of the LED on the backlight control board 30 A monitor board 20 characterized by sending a signal for controlling the signal and a signal for controlling the contrast ratio of the screen to the TFT-LCD panel 40;

The backlight control board 30 adjusts the temperature by controlling the brightness of the TFT-LCD panel 40 by using the control signal transmitted from the monitor board 20.

The temperature sensor 10,

Installed in the TFT-LCD panel 40 to detect the surface temperature of the raised panel due to external environmental factors and internal factors due to heat generation of the backlight LED in real time, and transmit the detected temperature data to the monitor board 20 Consists of doing,

The monitor board 20,

The temperature data received from the temperature sensor 10 is compared with the temperature initially set according to the time period, and when the set temperature is reached, the initial set value is maintained, and when the set temperature is exceeded, the TFT-LCD panel 40 is operated by hardware means. It is composed of reducing the temperature rise from external environmental factors by operating the device by transmitting a signal to the cooling fan 50 installed outside the panel to lower the temperature of,

It is composed of sending power and brightness control signals to the backlight control board 30 to lower the temperature of the TFT-LCD panel 40 by software means.

It applies the digital signal data to the panel and adjusts the contrast ratio within the range that is not perceived by the user to minimize the change of the screen.

The backlight control board 30,

In order to lower the temperature of the TFT-LCD panel 40 in response to the control signal of the monitor board 20 is configured to lower the voltage supplied to the backlight LED to adjust the brightness of the LED,

After controlling the brightness of the LED is configured to control the voltage supplied to the LED by using a current feedback in order to maintain a constant brightness, it is composed of a constant brightness,

After adjusting the brightness of the LED, the monitor board 20 compares the reset temperature with the temperature of the TFT-LCD panel 40 and sets the brightness of the LED and the contrast ratio of the screen to the initial values when the initial set value is reached. It consists of doing.

2 is a flowchart of a high brightness monitor automatic temperature control system according to the present invention.

As shown in Figure 2, the high brightness monitor automatic temperature control system of the present invention,

A temperature sensor 10 installed on the TFT-LCD panel 40 detects the surface temperature of the panel in real time (100);

Transmitting (110) the temperature data of the sensed panel to a monitor board (20);

Comparing the sensed panel's temperature data with an initially set temperature (120);

If the temperature is higher than the initial set temperature, the monitor board transmits a signal for operating the cooling fan 50 installed outside the TFT-LCD panel 40 (130);

Transmitting a LED control signal to the backlight control board 30 (140);

Based on the transmitted signal, the brightness of the backlight LED is adjusted downward and the contrast ratio of the screen is adjusted upward (150);

Detecting the surface temperature of the TFT-LCD panel 40 after controlling the brightness of the backlight LED and operating the cooling fan 50 and comparing the temperature with the temperature data initially set (160);

When the temperature data value is initially set, the brightness of the backlight LED and the contrast ratio of the screen are set to an initial value (170).

In more detail, the temperature sensor 10 installed in the TFT-LCD panel 40 detects the surface temperature rise of the panel in real time due to external environmental factors and internal factors caused by the heating of the backlight LED (100). The detected temperature data is transmitted to the monitor board 20 as a digital signal (110). The monitor board 20 compares the initially set temperature with the initial temperature based on the transmitted temperature data of the panel. If the setting is maintained and the temperature is higher than the set temperature, a processor for lowering the temperature of the TFT-LCD panel 40 is executed (120), and as a hardware means for lowering the temperature, the outside of the TFT-LCD panel 40 is The operating signal is sent to the installed cooling fan 50 to operate the equipment to reduce the temperature rise of the panel from external environmental factors (130), and LED means to control the backlight control board 30 by software means In order to solve the heat generation problem of the backlight LED which is the main factor of the TFT-LCD panel temperature rise by transmitting the signal (140), the voltage supplied to the LED is lowered based on the control signal (Dimming) applied from the monitor board 20. The brightness of the LED is lowered, and the brightness of the LED is lowered. Therefore, the display screen becomes darker, and the effect of the TFT-LCD panel screen installed by the user is reduced. The screen darkening is minimized accordingly. (150) After controlling the temperature of the TFT-LCD panel 40 by such hardware and software means, the surface temperature and initial temperature of the panel detected by the temperature sensor 10 are minimized. When the temperature reaches the set value by comparing the set temperature of the monitor board 20 transmits a signal to the backlight control board 30 and the brightness of the set LED It consists of setting the contrast ratio of the screen to the initial value.

3A to 3F are circuit diagrams of a high brightness monitor automatic temperature control system according to the present invention.

3A illustrates operation 1 of FIG. 1,

The temperature sensor 10 is installed in the TFT-LCD panel 40 to detect the surface temperature of the panel which is raised due to internal factors due to external environmental factors and heat generation of the backlight LED in real time, and detects the temperature of the panel. A circuit diagram showing transmission of data to the monitor board 20 as a digital signal.

3B illustrates operation 2 of FIG. 1,

This is a circuit diagram of P1 and P2 for operating the cooling fan 50 by supplying a voltage of 12V to 24V by the output control signal of the monitor board 20 to reduce the rise from external environmental factors when the panel temperature rises. .

3C to 3F illustrate operation 3 and operation 4 of FIG. 1,

3C illustrates a configuration 310 of P3 for applying power and control signals (ON / OFF, Dimming) transmitted from the monitor board 20 to the backlight control board 30, and the monitor board 20 and the backlight control board ( 30) consists of a configuration 320 of the communication port P6, P7 for signal transmission between,

3D illustrates a configuration 330 for controlling a power level supplied to a backlight by changing a dimming signal received from the monitor board 20 and a configuration of PWM_ON for applying a signal to control the brightness of the LED by the control signal 340. ),

Figure 3e is made of a configuration 350 of P4, P5 to control the brightness of the LED by controlling the voltage supplied to the LED based on the applied voltage signal,

FIG. 3F is configured to control the voltage supplied to the LED using the current feedback to maintain the brightness after controlling the brightness of the LEDs.

As described above, the present invention adjusts the brightness of the LED downward in order to solve the heat generation problem of the backlight unit, which is a main factor of the temperature increase when the temperature of the high-brightness TFT-LCD panel installed in the outdoors is lowered, and also lowers the brightness of the LED. It is possible to control the temperature of the panel while minimizing user's inconvenience by adjusting the contrast ratio of the display screen to solve the darkness of the screen, and the TFT-LCD panel detects the temperature in real time even when using it for a long time. It is possible to control the temperature of the panel, and additionally, by installing a cooling fan outside the TFT-LCD panel, it is possible to reduce the temperature rise of the panel due to external factors, which extends the life of the panel and increases safety. Can be.

 The foregoing description of the present invention is not limited to the above embodiments, and it will be understood by those skilled in the art that the present invention may be embodied in a modified form without departing from the essential characteristics of the present invention. will be. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

10: temperature sensor
20: monitor board
30: backlight control board
40: TFT-LCD Panel
50: cooling fan

Claims (8)

A temperature sensor 10 installed in the TFT-LCD panel 40 for sensing a surface temperature of the panel;
A monitor board 20 for transmitting control signals to the cooling fan 50, the backlight control board 30, and the TFT-LCD panel 40; In the high brightness monitor automatic temperature control system consisting of; a backlight control board 30 for controlling the brightness of the backlight LED
The temperature sensor 10,
It consists of transmitting the surface temperature data of the panel detected in real time to the monitor board 20,
The monitor board 20,
When the received temperature data rises above the initial set temperature, it consists of sending a control signal for controlling the temperature of the panel to the backlight control board 30 by hardware means and software means,
The backlight control board 30,
Receiving a control signal of the monitor board 20, by controlling the voltage supplied to the backlight LED, high brightness monitor automatic temperature control system, characterized in that consisting of adjusting the temperature by lowering the brightness of the LED. The method of claim 1,
The temperature sensor 10,
Installed in the TFT-LCD panel 40 to detect the surface temperature of the raised panel due to external environmental factors and internal factors due to heat generation of the backlight LED in real time, and transmit the detected temperature data to the monitor board 20 High brightness monitor automatic temperature control system, characterized in that consisting of. The method of claim 1,
The hardware means of the monitor board 20 transmits an operation signal to a cooling fan 50 installed outside of the panel to lower the temperature of the TFT-LCD panel 40 to operate the device, thereby removing the external environmental factors. High brightness monitor automatic temperature control system, characterized by reducing the temperature rise. The method of claim 1,
The software means of the monitor board 20 is configured to send power and brightness control signals (ON / OFF, Dimming) to the backlight control board 30 to lower the temperature of the TFT-LCD panel 40. High brightness monitor automatic temperature control system. The method of claim 1,
The monitor board 20,
In order to solve the inconvenience of the user due to the darkness of the screen by adjusting the brightness of the backlight LED down, the digital signal is applied to the panel to adjust the contrast ratio within the range that is not perceived by the user to minimize the change of the screen. High brightness monitor automatic temperature control system. The method according to any one of claims 1 and 4,
The backlight control board 30,
Converts the dimming signal transmitted from the monitor board 20 to control the voltage supplied to the backlight, applies a PWM_ON signal to the backlight to control the brightness of the backlight LED by the control signal, the backlight based on the applied signal A high-brightness monitor automatic temperature control system, characterized by controlling the voltage of the LED to control the brightness of the LED. The method of claim 6,
The backlight control board 30 is configured to maintain a constant brightness by controlling the voltage supplied to the backlight LED using a current feedback in order to maintain a constant brightness after controlling the brightness of the backlight LED. Monitor automatic temperature control system. The method according to any one of claims 4 and 5,
After controlling the brightness of the backlight LED, the monitor board 20 compares the reset temperature with the temperature of the TFT-LCD panel to set the brightness of the backlight LED and the contrast ratio of the panel to the initial value when the initial setting value is reached. High brightness monitor automatic temperature control system, characterized in that consisting of sending a signal.
KR1020100016497A 2010-02-24 2010-02-24 High-brightness monitor auto temperature control system KR20110096930A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015083942A1 (en) * 2013-12-03 2015-06-11 Samsung Electronics Co., Ltd. Image processing apparatus and control method thereof
KR20170001435U (en) 2015-10-14 2017-04-24 심무보 Complex information display device
CN115443498A (en) * 2020-05-01 2022-12-06 索尼集团公司 Signal processing device, signal processing method and display device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015083942A1 (en) * 2013-12-03 2015-06-11 Samsung Electronics Co., Ltd. Image processing apparatus and control method thereof
US9641788B2 (en) 2013-12-03 2017-05-02 Samsung Electronics Co., Ltd. Image processing apparatus and control method for thermal mitigation of sub processors
KR20170001435U (en) 2015-10-14 2017-04-24 심무보 Complex information display device
CN115443498A (en) * 2020-05-01 2022-12-06 索尼集团公司 Signal processing device, signal processing method and display device

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