CN107424579B - Embedded light induction driving system and driving method thereof - Google Patents
Embedded light induction driving system and driving method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000006698 induction Effects 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 238000009966 trimming Methods 0.000 claims description 6
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 239000002210 silicon-based material Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 33
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 abstract 2
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 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
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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
- G09G3/3406—Control of illumination source
-
- 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
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- General Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides an embedded light induction driving system and a driving method thereof, wherein the embedded light induction driving system comprises a brightness adjusting module, a driving module and a display module; the display module comprises a backlight source and a display panel, and the display panel comprises a TFT element; the brightness adjusting module is connected with the drain electrode of the TFT element and is used for sampling the drain current of the TFT element and the voltage between the source electrode and the drain electrode, obtaining a corresponding current threshold according to the voltage and outputting a PWM signal of a corresponding gear to the driving module according to the difference value of the drain current and the current threshold; and the driving module drives the backlight source of the display module to emit light according to the received PWM signal. The invention uses the TFT element on the display panel as the optical sensor, does not need an external optical sensor and a related device thereof, and automatically adjusts the brightness of the gear according to the ambient illumination, thereby achieving the effect that the eyes watch the screen more comfortably under different ambient illuminations.
Description
Technical Field
The invention relates to the field of liquid crystal light induction control, in particular to an embedded light induction driving system and a driving method thereof.
Background
In the conventional vehicle-mounted display device, an external light sensing device is generally used for sensing ambient light, so that brightness changes of two gears are performed. However, such a display device needs to use an external light sensing device to perform ambient light sensing, and has limited adjustment steps, and the obtained screen brightness is not suitable for all users to watch the screen comfortably.
Disclosure of Invention
In order to solve the above problems, the present invention provides an embedded photo-sensing driving system and a driving method thereof.
An embedded light induction driving system comprises a brightness adjusting module, a driving module and a display module. The display module comprises a backlight source and a display panel, and the display panel comprises a TFT element. The brightness adjusting module is connected with the drain electrode and the source electrode of the TFT element and is used for sampling the drain current of the TFT element and the voltage between the source electrode and the drain electrode, obtaining a corresponding current threshold value according to the voltage and outputting a PWM signal of a corresponding gear to the driving module according to the difference value of the drain current and the current threshold value. And the driving module drives the backlight source of the display module to emit light according to the received PWM signal.
Furthermore, the semiconductor layer of the TFT element is an amorphous silicon material or a silicon oxide material.
Further, the brightness adjusting module comprises a switching unit for switching the brightness adjusting module into an automatic adjusting mode or a manual adjusting mode according to a switching instruction input by a user; and when the brightness adjusting module is in a manual adjusting mode, the brightness adjusting module outputs the PWM signal of the corresponding gear according to the received user setting instruction.
Further, the brightness adjustment module comprises an initialization unit, and the initialization unit is used for initializing the backlight source of the display module according to a system default value or the user setting instruction.
Further, the brightness adjusting module further includes a fine-tuning unit, configured to adjust the PWM signal according to the received fine-tuning instruction, so as to adjust the brightness of the backlight source.
The invention also provides a driving method of the embedded light sensing driving system, which comprises the steps of sampling the drain current of the TFT element in the display panel and the voltage between the drain and the source; obtaining a corresponding current threshold according to the voltage, and outputting a PWM signal of a corresponding gear to a driving module according to the difference value of the drain current and the current threshold; and driving a backlight source of the display module to emit light according to the received PWM signal.
Further, the step of sampling the drain current of the TFT element and the voltage between the drain and the source in the display panel includes receiving a switching instruction input by a user, so as to switch the brightness adjusting module to the automatic adjusting mode or the manual adjusting mode according to the switching instruction; judging whether the brightness adjusting module is in an automatic adjusting mode or not; if the brightness adjusting module is in an automatic adjusting mode, entering a step of sampling drain current of a TFT element in the display panel and voltage between a drain electrode and a source electrode; and if the brightness adjusting module is in a manual adjusting mode, receiving a user setting instruction to output a PWM signal of a corresponding gear, and setting the zone bit to be a high level.
Further, before the step of receiving a switching instruction input by a user, judging whether the flag bit is at a high level; if the flag bit is at a high level, initializing a backlight source of the display module according to the user setting instruction; and if the flag bit is at a low level, initializing a backlight source of the display module according to a system default value.
Further, the step of obtaining a corresponding current threshold according to the voltage, and outputting a PWM signal of a corresponding gear to the driving module according to a difference between the drain current and the current threshold includes receiving a trimming instruction to adjust the PWM signal, so as to adjust the brightness of the backlight source.
Further, the step of adjusting the PWM signal according to the received fine adjustment command to adjust the brightness of the backlight source includes outputting a fine adjustment command for gradual or vertical adjustment according to a user setting command.
The invention provides an embedded light sensing driving system and a driving method thereof, wherein a TFT element on a display panel is used as a light sensor, an external light sensing sensor and a related device thereof are not needed, the brightness of gears is automatically adjusted according to the ambient illumination, and the effect that the eyes of people with different ambient illumination can watch a screen more comfortably is achieved.
Drawings
Fig. 1 is a system configuration diagram of an embodiment of the present invention.
Fig. 2 is a flowchart of a driving method according to an embodiment of the invention.
Fig. 3 is a flowchart of selecting an adjustment mode of a driving method according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating initialization of a driving method according to an embodiment of the present invention.
Fig. 5 is a flowchart of adjusting the PWM signal according to the driving method of the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Fig. 1 is a system configuration diagram of an embodiment of the present invention. An embedded light induction driving system comprises a brightness adjusting module 1, a driving module 2 and a display module 3.
The display module 3 includes a backlight 4 and a display panel 5, and the display panel 5 includes a TFT element 6. The brightness adjusting module 1 is connected to the drain d and the source s of the TFT element 6, and is configured to sample a drain current of the TFT element 6 and a voltage between the source s and the drain d, and obtain a corresponding current threshold according to the voltage, so as to output a PWM signal of a corresponding gear to the driving module 2 according to a difference between the drain current and the current threshold. The driving module 2 drives the backlight 4 of the display module 3 to emit light according to the received PWM signal.
The TFT element 6 generates a photoelectric effect under illumination, and the magnitude of the drain current of the TFT element 6 changes under illumination of different intensities of ambient light. Therefore, under the preset illumination (no illumination or a certain illumination value), the corresponding drain current threshold (also referred to as a reference value) can be obtained according to the voltage between the source and the drain of the TFT element 6, and therefore, the drain current threshold (also referred to as a reference value) of the TFT element 6 under the preset illumination (no illumination or a certain illumination value) can be known by measuring the voltage between the source and the drain under the ambient illumination, and the difference value of the intensity of the ambient illumination based on the preset illumination can be obtained according to the difference value between the drain current and the current threshold (reference value) under the ambient illumination. In this embodiment, the ambient light level is sampled without providing an external light sensing sensor and related devices.
Specifically, the above process of obtaining the ambient light is illustrated as follows: the voltage between the source and the drain is measured to be 1V, it can be known that the drain current threshold (also referred to as a reference value) of the TFT element 6 based on the preset illumination of 100lx is 1A, and the difference of the ambient light intensity based on the preset illumination of 100lx can be obtained according to the difference between the drain current measured under the ambient illumination of 2A and the current threshold (reference value) 1A; if the difference value of the ambient light illumination intensity based on the preset illumination 100lx can be obtained according to the difference value between the drain current measured under the ambient light and the current threshold (reference value) 1A, wherein the difference value is larger than 900 lx; that is, the larger the difference between the drain current measured under the ambient light and the current threshold (reference value) 1A, the larger the difference between the intensity of the ambient light based on the preset illumination 100lx can be obtained. The present invention is not limited to a set of preset illumination data to determine the ambient illumination, and may call another set of corresponding preset illumination data to determine the ambient illumination according to the difference between the obtained drain current and the current threshold (reference value).
The brightness adjustment module 1 of the embedded photo-sensing driving system of the present invention compares the difference between the drain current and the current threshold (reference value), not limited to the comparison of the magnitude of the comparison data value itself, but may be the comparison of the magnitude of the comparison data value after the amplification and other processing. Specifically, the brightness adjusting module 1 samples to obtain a drain current signal under ambient illumination, and then obtains an amplified sampling value through amplification, filtering, and analog-to-digital conversion, and inputs the amplified sampling value to a data processor inside the brightness adjusting module 1, and the data processor compares the amplified sampling value with a value obtained by amplifying a current threshold (reference value) and the like.
The embedded light sensing driving system further comprises a power circuit 9, a gate driving circuit 11, a source driving circuit 10 and a timing control circuit 8, and is used for connecting the input module 7 and displaying a picture on the display panel 5. The input module 7 outputs a corresponding instruction of interface control to the brightness adjusting module 1.
Specifically, the semiconductor layer of the TFT element 6 is an amorphous silicon material or a silicon oxide material. The ratio of the maximum source-drain current to the minimum source-drain current of the amorphous silicon material is easily 106Therefore, the amorphous silicon device becomes a very efficient switch, has photoelectric characteristics, causes the increase of leakage current under illumination, and is suitable for sampling the ambient illumination. The silicon oxide material also has the characteristic of changing drain current under illumination, and is also suitable for sampling ambient illumination.
Specifically, the brightness adjusting module 1 includes a switching unit, configured to switch the brightness adjusting module 1 into an automatic adjusting mode or a manual adjusting mode according to a switching instruction input by a user; when the brightness adjusting module 1 is in the manual adjusting mode, the brightness adjusting module 1 outputs the PWM signal of the corresponding gear according to the received user setting instruction.
Specifically, the brightness adjusting module 1 includes an initializing unit, and the initializing unit is configured to initialize the backlight 4 of the display module 3 according to a system default value or a user setting instruction, so that after the power is turned on, a gear of the display panel 5 displaying brightness is a system default gear or a gear set by a user.
Specifically, the brightness adjusting module 1 further includes a fine-tuning unit, configured to adjust the PWM signal according to the received fine-tuning instruction, so as to adjust the brightness of the backlight 4, and achieve fine tuning of the automatically matched gear of the system, for example, a user sets a corresponding change of brightness or darkness of the gear according to personal preference of light brightness, and stores the setting in the fine-tuning instruction, and then the fine-tuning unit adjusts the PWM signal according to the received fine-tuning instruction, so as to adjust the brightness of the backlight 4 to achieve a more comfortable effect of viewing the display panel 5.
Fig. 2 is a flowchart of a driving method according to an embodiment of the invention. The invention provides a driving method of an embedded light induction driving system, which comprises the following steps:
step S21: sampling a drain current and a voltage between a source and a drain of the TFT element 6 in the display panel 5;
step S22: obtaining a corresponding current threshold according to the voltage, and outputting a PWM signal of a corresponding gear to the driving module 2 according to the difference value of the drain current and the current threshold;
step S23: and driving the backlight 4 of the display module 3 to emit light according to the received PWM signal.
Fig. 3 is a flowchart of selecting an adjustment mode of a driving method according to an embodiment of the present invention. Further, step S21 of sampling the drain current of the TFT element 6 and the voltage between the source and the drain in the display panel 5 and obtaining the corresponding current threshold from the voltage includes:
step S201: receiving a switching instruction input by a user, and switching the brightness adjusting module 1 into an automatic adjusting mode or a manual adjusting mode according to the switching instruction;
step S202: judging whether the brightness adjusting module 1 is in an automatic adjusting mode;
step S203: if the brightness adjusting module 1 is in the auto-adjusting mode, the step S21 of sampling the drain current of the TFT device 6 in the display panel 5 is performed;
step S204: if the brightness adjusting module 1 is in the manual adjusting mode, a user setting instruction is received to output a PWM signal of a corresponding gear, and the flag bit is set to be a high level.
Fig. 4 is a flowchart illustrating initialization of a driving method according to an embodiment of the present invention. Further, step S201 of receiving a switching instruction input by a user previously includes:
step S11: judging whether the flag bit is at a high level;
step S12: if the flag bit is at a high level, initializing a backlight source 4 of the display module 3 according to a user setting instruction;
step S13: if the flag is low level, the backlight 4 of the display module 3 is initialized according to the default value of the system.
The above steps can be used for initialization at the start of operation of the present embodiment.
Fig. 5 is a flowchart of adjusting the PWM signal according to the driving method of the embodiment of the invention. Further, the step S22 of obtaining a corresponding current threshold according to the voltage, and outputting the PWM signal of the corresponding gear to the driving module 2 according to the difference between the drain current and the current threshold includes:
step S222: the PWM signal is adjusted by receiving the trimming command to adjust the brightness of the backlight 4.
Further, the step S222 of adjusting the PWM signal according to the received trimming command to adjust the brightness of the backlight 4 includes:
step S221: and outputting fine adjustment instructions of gradual change or vertical change adjustment according to the setting instructions of the user. When a user sets an instruction to be gradual change adjustment, a plurality of intermediate gears are sequentially output in the process of outputting the ambient light matching gear brightness, so that the gear brightness slowly reaches the ambient light matching gear brightness; and the user sets the instruction to be the vertical shift adjustment, only a few intermediate gears are sequentially output or the intermediate gears are not output in the process of outputting the ambient light matching gear brightness, so that the gear brightness reaches the ambient light matching gear brightness at once. For example, the gear of the brightness matched with the ambient light is m, the gear of the current screen brightness is n, if m is larger than n, the user sets the instruction to be gradual adjustment, n +1 is sequentially output, n +2 is sequentially increased by 1 to m in the process of outputting the brightness matched with the gear of the ambient light, the number of output middle gears is large, and the brightness of the screen is slowly changed; when the user sets the instruction to be the vertical shift adjustment, n +5 is sequentially output in the process of outputting the ambient light matched with the gear brightness, n +10 is sequentially increased by 5 to m, the output middle gears are fewer, the brightness of the screen is rapidly changed, and similarly, the brightness can be correspondingly set and realized when m is smaller than n; the above is only one implementation of implementing gradual or vertical adjustment, but the invention is not limited thereto.
The invention provides an embedded light sensing driving system and a driving method thereof, wherein a TFT (thin film transistor) element 6 on a display panel 5 is used as a light sensor, an external light sensing sensor and a related device thereof are not needed, the brightness of gears is automatically adjusted according to the ambient illumination, and the effect that people can watch a screen more comfortably by eyes under different ambient illumination is achieved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An embedded light induction driving system is characterized by comprising a brightness adjusting module, a driving module and a display module;
the display module comprises a backlight source and a display panel, and the display panel comprises a TFT element;
the brightness adjusting module is connected with a drain electrode and a source electrode of the TFT element and is used for sampling drain current of the TFT element and voltage between the source electrode and the drain electrode, obtaining a corresponding current threshold value according to the voltage and outputting a PWM signal of a corresponding gear to the driving module according to the difference value of the drain current and the current threshold value;
and the driving module drives the backlight source of the display module to emit light according to the received PWM signal.
2. The embedded photo-sensing driving system as claimed in claim 1, wherein the semiconductor layer of the TFT device is an amorphous silicon material or a silicon oxide material.
3. The embedded light sensing driving system according to claim 1, wherein the brightness adjustment module comprises a switching unit for switching the brightness adjustment module into an automatic adjustment mode or a manual adjustment mode according to a switching instruction input by a user;
and when the brightness adjusting module is in a manual adjusting mode, the brightness adjusting module outputs the PWM signal of the corresponding gear according to the received user setting instruction.
4. The embedded light sensing driving system according to claim 3, wherein the brightness adjustment module comprises an initialization unit, and the initialization unit is configured to initialize a backlight source of the display module according to a system default or the user setting instruction.
5. The embedded photo-sensing driving system as claimed in claim 1, wherein the brightness adjustment module further includes a trimming unit for adjusting the PWM signal according to the received trimming command to adjust the brightness of the backlight source.
6. A driving method of an embedded light sensing driving system is characterized by comprising the following steps:
sampling drain current of a TFT element in a display panel and voltage between a source electrode and a drain electrode;
obtaining a corresponding current threshold according to the voltage, and outputting a PWM signal of a corresponding gear to a driving module according to the difference value of the drain current and the current threshold;
and driving a backlight source of the display module to emit light according to the received PWM signal.
7. The driving method of an embedded photo-sensing driving system as claimed in claim 6, wherein the step of sampling the drain current and the voltage between the source and the drain of the TFT device in the display panel comprises:
receiving a switching instruction input by a user, and switching a brightness adjusting module into an automatic adjusting mode or a manual adjusting mode according to the switching instruction;
judging whether the brightness adjusting module is in an automatic adjusting mode or not;
if the brightness adjusting module is in an automatic adjusting mode, entering a step of sampling drain current of a TFT element in the display panel and voltage between a source electrode and a drain electrode;
and if the brightness adjusting module is in a manual adjusting mode, receiving a user setting instruction to output a PWM signal of a corresponding gear, and setting the zone bit to be a high level.
8. The driving method of an embedded photo-sensing driving system as claimed in claim 7, wherein the step of receiving a switching command input by a user comprises:
judging whether the flag bit is at a high level;
if the flag bit is at a high level, initializing a backlight source of the display module according to the user setting instruction;
and if the flag bit is at a low level, initializing a backlight source of the display module according to a system default value.
9. The method as claimed in claim 7, wherein the step of obtaining a corresponding current threshold according to the voltage, and outputting a PWM signal of a corresponding step to the driving module according to a difference between the drain current and the current threshold comprises:
and receiving a fine adjustment instruction to adjust the PWM signal so as to adjust the brightness of the backlight source.
10. The driving method of an embedded photo-sensing driving system as claimed in claim 9, wherein the step of adjusting the PWM signal according to the received trimming command to adjust the brightness of the backlight source comprises:
and outputting fine adjustment instructions of gradual change or vertical change adjustment according to the setting instructions of the user.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11818939B2 (en) | 2020-11-30 | 2023-11-14 | Wuhan Tianma Micro-Electronics Co., Ltd. | Display panel and electronic device |
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| CN110057306B (en) * | 2019-06-03 | 2024-06-07 | 呜啦啦(广州)科技有限公司 | Driving device of circumference sensor and automatic zeroing initialization method thereof |
| CN110108234B (en) * | 2019-06-03 | 2024-06-07 | 呜啦啦(广州)科技有限公司 | Current type bidirectional bending sensor driving device and automatic return-to-zero initialization method |
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