CN114120930A - Display screen with embedded temperature sensing function and regulating and controlling method thereof - Google Patents
Display screen with embedded temperature sensing function and regulating and controlling method thereof Download PDFInfo
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- CN114120930A CN114120930A CN202111287912.8A CN202111287912A CN114120930A CN 114120930 A CN114120930 A CN 114120930A CN 202111287912 A CN202111287912 A CN 202111287912A CN 114120930 A CN114120930 A CN 114120930A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 title claims description 22
- 230000001276 controlling effect Effects 0.000 title claims description 7
- 230000006870 function Effects 0.000 title description 2
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims abstract description 15
- 239000002356 single layer Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 11
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 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
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- 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
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Abstract
The invention discloses a display screen embedded with a temperature sensing function and a regulation and control method thereof, wherein the display screen comprises an LCD panel, the stacked structure of the LCD panel from top to bottom is an upper polaroid, a CF substrate, a TFT array substrate and a lower polaroid, the TFT array substrate consists of a display area and a non-display area, and the non-display area is provided with a temperature sensing TFT for detecting temperature. According to the invention, the temperature-sensitive TFT is arranged on the TFT array substrate, and the temperature characteristic of the temperature-sensitive TFT is utilized to introduce the leakage current of the temperature-sensitive TFT into the drive IC or the drive IC after the leakage current is converted into the temperature, so that the output voltage of the drive IC is kept stable, the adjustment of the display effect of the display screen is realized, and the display effect of the display screen is consistent with the normal temperature in a low-temperature or high-temperature environment.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a display screen with a built-in temperature sensing function and a regulating and controlling method thereof.
Background
At present, liquid crystal display screens in the market are all TFT screens, namely, a thin film transistor array technology is adopted. Based on the temperature characteristics of the TFT, the mobility of carriers in the TFT is decreased as the temperature increases, so that Vtft (source-drain voltage of the TFT) is decreased as the temperature increases, which causes different leakage currents in different temperature environments, and when the same voltage is applied externally, the leakage current is increased, which increases the standby power consumption, and also increases the liquid crystal driving voltage, which deteriorates the liquid crystal display effect and increases the power consumption.
On the contrary, as the temperature decreases, Vtft increases, which causes the driving voltage to decrease, the liquid crystal display effect to deteriorate, and the picture to become white or even to be turned off.
In order to solve the above problems, it is necessary to ensure the stability of the liquid crystal driving voltage, and therefore, the input voltage of the TFT needs to be adjusted, and further, the temperature of the display screen needs to be measured, and the input voltage of the TFT needs to be adjusted according to the temperature characteristic of the TFT and the current temperature, so as to ensure that the driving voltage output by the TFT remains stable, and ensure the display effect.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a display screen embedded with a temperature sensing function and a regulation and control method thereof, wherein the output of a drive IC can be regulated by detecting the temperature of the display screen, so that the drive voltage output by a TFT (thin film transistor) is kept stable, and the display effect of the display screen is ensured.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the utility model provides an embedded temperature sensing function's display screen, the display screen includes the LCD panel, the LCD panel is last polaroid, CF base plate, TFT array substrate and polaroid down from last stacked structure extremely down, the TFT array substrate comprises display area and non-display area, is equipped with the temperature sensing TFT that is used for detecting the temperature at non-display area.
Furthermore, the temperature-sensitive TFT and the display driving TFT in the display area of the TFT array substrate have the same structure and material, and are manufactured under the same process.
Preferably, the number of the temperature-sensitive TFTs is 2 or more.
Furthermore, the grid electrode, the source electrode and the drain electrode of the temperature-sensing TFT are respectively connected in parallel, namely the grid electrodes of all the temperature-sensing TFTs are connected in parallel, the source electrodes of all the temperature-sensing TFTs are connected in parallel, and the drain electrodes of all the temperature-sensing TFTs are connected in parallel.
Furthermore, the lower portion of the TFT array substrate is a single-layer area, the single-layer area is a portion of a non-display area, a driving IC and FPC binding pins are arranged in the single-layer area, and a grid electrode, a source electrode and a drain electrode of the temperature-sensing TFT are led to the FPC binding pins through routing wires respectively.
Furthermore, the lower portion of the TFT array substrate is a single-layer area, the single-layer area is a portion of a non-display area, a driver IC and FPC binding pins are arranged in the single-layer area, and a grid electrode, a source electrode and a drain electrode of the temperature-sensing TFT are respectively led to input pins of the driver IC through wires.
Further, the driving IC incorporates a voltage regulation module, and a control signal of the voltage regulation module is derived from an external input signal, which is a leakage current signal of the temperature-sensitive TFT.
A method for regulating and controlling a display screen with a built-in temperature sensing function is characterized in that the leakage current of a temperature sensing TFT is directly input into a driving IC by utilizing the direct proportional relation between the leakage current and the temperature of the temperature sensing TFT, and then the driving IC is regulated and controlled to enable the output driving voltage of the driving IC to be stable, or the leakage current of the temperature sensing TFT is converted into the temperature through calculation and then input into the driving IC, and then the driving IC is regulated and controlled to enable the output driving voltage of the driving IC to be stable, the temperature sensing TFT is manufactured in a single-layer area of the display screen, and the temperature sensing TFT and the display driving TFT in a display area of a TFT array substrate have the same structure and materials and are manufactured under the same process.
Further, the formula for calculating and converting the leakage current of the temperature-sensitive TFT into the temperature is as follows: and Tt ═ is (It/I0) ^ (2/3) × (T0+273) -273, wherein I0 is the leakage current of the temperature-sensitive TFT at the temperature T0, and It is the leakage current of the temperature-sensitive TFT at the temperature Tt.
Further, the I0 is leakage current of n temperature-sensitive TFTs at a temperature T0, the It is leakage current of n temperature-sensitive TFTs at a temperature Tt, and n is a natural number greater than 1.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the invention, the temperature-sensitive TFT is arranged on the TFT array substrate, and the temperature characteristic of the temperature-sensitive TFT is utilized to introduce the leakage current of the temperature-sensitive TFT into the drive IC or the drive IC after the leakage current is converted into the temperature, so that the output voltage of the drive IC is kept stable, the adjustment of the display effect of the display screen is realized, and the display effect of the display screen is consistent with the normal temperature in a low-temperature or high-temperature environment.
Drawings
FIG. 1 is a diagram of a temperature-sensitive TFT parallel circuit of the present invention;
FIG. 2 is a flow chart of the display screen adjustment and control of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a display screen with an embedded temperature sensing function and a regulation and control method of the display screen. The display screen is embedded with the temperature-sensing TFT with the temperature measuring function, the current temperature of the display screen is measured and calculated by utilizing the temperature characteristic (the temperature and the leakage current are in a proportional relation) of the temperature-sensing TFT, and the output voltage of the drive IC is regulated and controlled by utilizing the temperature, so that the display effect of the display screen is controlled.
Example 1
For the invention, the display screen at least comprises an LCD panel, and the basic structure of the LCD panel comprises an upper polarizer, a CF substrate, a TFT array substrate and a lower polarizer which are sequentially stacked from top to bottom, wherein the TFT array substrate consists of a display area and a non-display area, and the non-display area is provided with a temperature-sensitive TFT for detecting temperature.
As a preferred embodiment of the present invention, the temperature-sensitive TFT and the display driving TFT in the display region of the TFT array substrate have the same structure and material, and are manufactured by the same process.
Since the leakage of the temperature-sensitive TFTs is small, the number of the temperature-sensitive TFTs is 2 or more in order to facilitate measurement and ensure accuracy. As shown in fig. 1, the present invention employs n temperature-sensing TFTs, and the gates, the sources and the drains of the temperature-sensing TFTs are respectively connected in parallel, that is, the gates of all the temperature-sensing TFTs are connected in parallel, the sources of all the temperature-sensing TFTs are connected in parallel, and the drains of all the temperature-sensing TFTs are connected in parallel, as shown in fig. 1.
As a preferred embodiment of the present invention, the lower portion of the TFT array substrate of the present invention is a single-layer region, the single-layer region is a portion of a non-display region, a driver IC and an FPC bonding pin are disposed in the single-layer region, and a gate, a source, and a drain of the temperature-sensitive TFT are respectively led to the FPC bonding pin by routing. The temperature sensing TFT is connected with the temperature detection circuit through the FPC, the MCU calculates the current temperature, then the temperature data is sent to the drive IC through the FPC, the output voltage (the drive voltage of the TFT in the display area) is adjusted through the drive IC, the display effect of the display screen is further adjusted, and the output voltage of the drive IC is kept stable during adjustment.
Based on the display screen structure, the invention provides a regulation and control method of a display screen embedded with a temperature sensing function, which is characterized in that the leakage current of a temperature sensing TFT is calculated and converted into temperature by utilizing the direct proportional relation between the leakage current and the temperature of the temperature sensing TFT, the temperature is input into a drive IC, and then the drive IC is regulated and controlled to ensure that the output drive voltage of the drive IC is kept stable. The flow chart of the display screen regulation and control method is shown in figure 2.
In the regulation and control method, the temperature-sensitive TFT leakage current and the temperature are in a direct proportional relation:
namely (Tt +273)/(T0+273) ═ It/I0 ^ (2/3),
from this, the leakage current It can be calculated: it is ((Tt +273)/(T0+273)) (3/2) × I0,
the formula for converting the leakage current of the temperature-sensitive TFT into temperature through calculation is as follows: and Tt ═ is (It/I0) ^ (2/3) × (T0+273) -273, wherein I0 is the leakage current of the temperature-sensitive TFT at the temperature T0, and It is the leakage current of the temperature-sensitive TFT at the temperature Tt.
In a preferred embodiment of the present invention, I0 is the leakage current of n temperature-sensitive TFTs at a temperature T0, and It is the leakage current of n temperature-sensitive TFTs at a temperature Tt. Namely, the measured current is the leakage current of n temperature-sensitive TFTs connected in parallel, and n is a natural number greater than 1.
In the invention, the MCU can also carry out judgment and comparison after calculating the current temperature, and can send out alarm information if the temperature exceeds the normal use temperature, wherein the alarm information can be a sound signal, a display signal or both.
Example 2
The present embodiment is different from embodiment 1 in that: in this embodiment, the lower portion of the TFT array substrate is a single-layer region, the single-layer region is a portion of a non-display region, a driver IC and an FPC bonding pin are disposed in the single-layer region, and a gate, a source, and a drain of the temperature-sensitive TFT are respectively led to an input pin of the driver IC through wires.
The driving IC is internally provided with a voltage regulating module, and a control signal of the voltage regulating module is from an external input signal, namely a leakage current signal of the temperature-sensitive TFT. A leakage current signal of the temperature-sensing TFT directly enters the drive IC, and the leakage current is converted into voltage by a voltage regulation module arranged in the drive IC and used as a regulation signal of the voltage regulation module to participate in the regulation work of the voltage regulation module, so that the drive IC is regulated and controlled to keep the output drive voltage stable, and the display effect of the display screen is regulated.
The method for regulating and controlling the display screen structure is different from the method in embodiment 1, in the method for regulating and controlling the display screen structure, the leakage current of the temperature-sensitive TFT is directly input into the driving IC by utilizing the direct proportional relation between the leakage current and the temperature of the temperature-sensitive TFT, and then the driving IC is regulated and controlled to enable the output driving voltage of the driving IC to be stable.
According to the control method, the leakage current directly enters the drive IC, so that circuits and conversion are reduced, and the efficiency is better.
For the invention, after the MCU calculates the current temperature, the MCU can convert the current temperature into a voltage signal to be input into the drive IC instead of the temperature signal, and the voltage signal enters the voltage regulation module of the drive IC to participate in the control of the output voltage of the drive IC.
Claims (10)
1. The utility model provides an embedded temperature sensing function's display screen, the display screen includes the LCD panel, the LCD panel is last polaroid, CF base plate, TFT array substrate and polaroid down from last stacked structure extremely down, the TFT array substrate comprises display area and non-display area, its characterized in that: a temperature-sensitive TFT for detecting temperature is provided in the non-display region.
2. The display screen with the embedded temperature sensing function according to claim 1, wherein: the temperature-sensitive TFT and the display driving TFT in the display area of the TFT array substrate have the same structure and material, and are manufactured under the same process.
3. The display screen with the embedded temperature sensing function according to claim 2, wherein: the number of the temperature-sensitive TFTs is more than 2.
4. The display screen with the embedded temperature sensing function according to claim 3, wherein: the grid electrode, the source electrode and the drain electrode of the temperature-sensing TFT are respectively connected in parallel, namely the grid electrodes of all the temperature-sensing TFTs are connected in parallel, the source electrodes of all the temperature-sensing TFTs are connected in parallel, and the drain electrodes of all the temperature-sensing TFTs are connected in parallel.
5. The display screen with the embedded temperature sensing function according to claim 4, wherein: the lower portion of the TFT array substrate is a single-layer area, the single-layer area is a portion of a non-display area, a driving IC and FPC binding pins are arranged in the single-layer area, and a grid electrode, a source electrode and a drain electrode of the temperature sensing TFT are led to the FPC binding pins through wiring respectively.
6. The display screen with the embedded temperature sensing function according to claim 1, wherein: the lower portion of the TFT array substrate is a single-layer area, the single-layer area is not part of a display area, a drive IC and an FPC binding pin are arranged in the single-layer area, and a grid electrode, a source electrode and a drain electrode of the temperature-sensing TFT are respectively led to an input pin of the drive IC through wiring.
7. The display screen with the embedded temperature sensing function according to claim 1, wherein: the driving IC is internally provided with a voltage regulating module, a control signal of the voltage regulating module is from an external input signal, and the external input signal is a leakage current signal of the temperature-sensitive TFT.
8. A regulation and control method of a display screen with a built-in temperature sensing function is characterized by comprising the following steps: the regulating method is characterized in that the leakage current of the temperature-sensing TFT is directly input into the drive IC by utilizing the direct proportional relation between the leakage current and the temperature of the temperature-sensing TFT, so that the output drive voltage of the drive IC is kept stable by regulating the drive IC, or the leakage current of the temperature-sensing TFT is converted into the temperature through calculation, the temperature is input into the drive IC, so that the output drive voltage of the drive IC is kept stable by regulating the drive IC, the temperature-sensing TFT is manufactured in a single-layer area of a display screen, and the temperature-sensing TFT and the display drive TFT in a display area of the TFT array substrate have the same structure and material and are manufactured under the same process.
9. The method according to claim 8, wherein the formula for converting the leakage current of the temperature-sensitive TFT into temperature through calculation is as follows: tt = (It/I0) ^ (2/3) × (T0+273) -273, wherein I0 is the leakage current of the temperature-sensitive TFT at the temperature T0, and It is the leakage current of the temperature-sensitive TFT at the temperature Tt.
10. The method for regulating and controlling the display screen with the embedded temperature sensing function according to claim 9, wherein the method comprises the following steps: the I0 is the leakage current of n temperature-sensitive TFTs at a temperature T0, It is the leakage current of n temperature-sensitive TFTs at a temperature Tt, and n is a natural number greater than 1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050066711A (en) * | 2003-12-27 | 2005-06-30 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display device and method for detecting temperature of the same |
| CN105278154A (en) * | 2015-11-25 | 2016-01-27 | 武汉华星光电技术有限公司 | Liquid crystal display device and liquid crystal display panel thereof |
| CN105741811A (en) * | 2016-05-06 | 2016-07-06 | 京东方科技集团股份有限公司 | Temperature compensating circuit, display panel and temperature compensating method |
| CN108803125A (en) * | 2018-06-27 | 2018-11-13 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and preparation method thereof |
| CN217113806U (en) * | 2021-11-02 | 2022-08-02 | 信利半导体有限公司 | Display screen with embedded temperature sensing function |
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- 2021-11-02 CN CN202111287912.8A patent/CN114120930A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050066711A (en) * | 2003-12-27 | 2005-06-30 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display device and method for detecting temperature of the same |
| CN105278154A (en) * | 2015-11-25 | 2016-01-27 | 武汉华星光电技术有限公司 | Liquid crystal display device and liquid crystal display panel thereof |
| CN105741811A (en) * | 2016-05-06 | 2016-07-06 | 京东方科技集团股份有限公司 | Temperature compensating circuit, display panel and temperature compensating method |
| CN108803125A (en) * | 2018-06-27 | 2018-11-13 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and preparation method thereof |
| CN217113806U (en) * | 2021-11-02 | 2022-08-02 | 信利半导体有限公司 | Display screen with embedded temperature sensing function |
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