CN111445869A - Brightness control device, control method thereof and display panel - Google Patents
Brightness control device, control method thereof and display panel Download PDFInfo
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- CN111445869A CN111445869A CN202010366559.1A CN202010366559A CN111445869A CN 111445869 A CN111445869 A CN 111445869A CN 202010366559 A CN202010366559 A CN 202010366559A CN 111445869 A CN111445869 A CN 111445869A
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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
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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
- 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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Abstract
The embodiment of the invention provides a brightness control device, a control method thereof and a display panel, wherein the brightness control device is applied to the display panel and comprises a light detection module, a power supply module and a brightness adjusting module, wherein the light detection module comprises at least one TFT (thin film transistor) and is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment; the power supply module is connected with the light detection module and is configured to provide the working voltage of the light detection module; the brightness adjusting module is connected with the light detection module and configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment. The invention effectively reduces the cost of adjusting the display brightness of the display panel, and the optical detection module is not independent of the display panel, thus being beneficial to the electronic equipment applying the display panel to realize the function integration of the whole electronic equipment.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a brightness control device, a display panel, and a control method of a brightness control device.
Background
With the popularization of L CD (L acquired Crystal Display) Display panels, in order to enable users to have better use experience, the prior art often installs a photosensor on an electronic device applying the L CD Display panel to adjust the backlight brightness of the L CD Display panel, so as to bring better visual experience to the users, wherein the photosensor is independent from the L CD Display panel.
However, the prior art approach to adjust the backlight brightness of L CD display panels has the following drawbacks:
firstly, the cost of the photosensitive sensor is high, and the cost of the photosensitive sensor becomes the inevitable cost of each electronic device, so that the cost of the electronic device is also high;
secondly, independent photosensitive sensor is unfavorable for current electronic equipment to realize complete machine function integration, and the L CD display panel need open the thru hole alone and satisfy the needs that photosensitive sensor gathered the ambient light information in the electronic equipment, is unfavorable for electronic equipment to realize the full screen.
Disclosure of Invention
In view of the foregoing problems, an object of the embodiments of the present invention is to provide a luminance control apparatus, a display panel and a control method of the luminance control apparatus, so as to solve the problems of high cost and independence of the light sensing sensor and the display panel in the manner of adjusting the backlight luminance of L CD display panel in the prior art.
In order to solve the above problems, an embodiment of the present invention discloses a brightness control apparatus applied to a display panel, comprising a light detection module, a power supply module and a brightness adjustment module, wherein,
the light detection module comprises at least one TFT, and is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment;
the power supply module is connected with the light detection module and is configured to provide working voltage of the light detection module;
the brightness adjusting module is connected with the light detection module and configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment.
In order to solve the above problem, an embodiment of the present invention further discloses a display panel including the brightness control device.
In order to solve the above problems, the embodiment of the present invention further discloses a control method of the brightness control apparatus, which includes a power-on phase, a working phase and a power-off phase, wherein in the power-on phase, a power supply module is started; in the working phase, providing a working voltage of the light detection module through the power supply module; and in the power-down stage, the power supply module is turned off.
The embodiment of the invention has the following advantages: the brightness control device is arranged to be applied to the display panel and comprises a light detection module, a power supply module and a brightness adjusting module, wherein the light detection module comprises at least one TFT (thin film transistor), and the light detection module is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment; the power supply module is connected with the light detection module and is configured to provide working voltage of the light detection module; the brightness adjusting module is connected with the light detecting module and configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment. The display brightness of the display panel is adjusted according to the light intensity of the current environment, and the light detection module comprises at least one TFT, the cost of the light detection module is far smaller than that of the photosensitive sensor, the cost of adjusting the display brightness of the display panel is effectively reduced, in addition, the brightness control device is applied to the display panel, namely, the display panel comprises the light detection module, the light detection module is not independent of the display panel, the electronic equipment which is favorable for applying the display panel realizes the function integration of the whole machine, the display panel does not need to open through holes for the light detection module, and the electronic equipment which is favorable for applying the display panel realizes a full-screen.
Drawings
FIG. 1 is a block diagram of a brightness control apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a light detecting module in an embodiment of a brightness control apparatus according to the present invention;
FIG. 3 is a block diagram of a brightness control apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal processing module according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a power supply module according to an embodiment of the brightness control apparatus of the present invention;
FIG. 6 is a diagram illustrating a timer according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a structure of a level shifter unit according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a driving signal generating module in an embodiment of a luminance controlling apparatus according to the present invention;
fig. 9 is a schematic structural diagram of a light-emitting driving module in an embodiment of a brightness control apparatus according to the present invention;
fig. 10 is a signal waveform diagram of an embodiment of a brightness control apparatus according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a block diagram of a brightness control apparatus according to an embodiment of the present invention is shown, where the brightness control apparatus is applied to a display panel, and the brightness control apparatus may specifically include a light detection module 1, a power supply module 2, and a brightness adjustment module 3, where the light detection module 1 includes at least one TFT, and the light detection module 1 is configured to detect light intensity of a current environment and generate a corresponding electrical signal according to the light intensity of the current environment; the power supply module 2 is connected with the light detection module 1, and the power supply module 2 is configured to provide an operating voltage of the light detection module 1; the brightness adjusting module 3 is connected to the light detecting module 1, and the brightness adjusting module 3 is configured to adjust the display brightness of the display panel according to the electrical signal corresponding to the light intensity of the current environment.
Specifically, the TFT may be an N-type TFT or a P-type TFT. If the TFT is an N-type TFT, the power supply module 2 may be configured to provide a gate terminal voltage and a drain terminal voltage of the N-type TFT, and at this time, the electrical signal output by the light detection module 1 may be a source terminal current of at least one TFT; if the TFT is a P-type TFT, the power supply module 2 may be configured to provide a gate terminal voltage and a source terminal voltage of the P-type TFT, and at this time, the electrical signal output by the light detection module 1 may be a drain terminal current of at least one TFT.
Specifically, the power supply module 2 and the brightness adjustment module 3 may be formed by any circuit and/or by any chip.
Alternatively, the display panel may be any display panel, such as an L CD display panel.
Specifically, if the light intensity of the current environment is higher, the brightness adjusting module 3 adjusts the display brightness of the display panel to be brighter; if the light intensity of the current environment is smaller, the brightness adjusting module 3 adjusts the display brightness of the display panel to be darker, so as to improve the visual experience of the user using the display panel.
As shown in FIG. 2, the display panel may include an array substrate 4, and the light detection module 1 may be integrated on the array substrate 4, so that not only the integration of the light detection module 1 and the array substrate 4 may be achieved, but also no through hole is required on the display panel (in the prior art, an L CD display panel needs to be separately provided with a through hole to satisfy the requirement of the photosensor to collect ambient light information) to satisfy the requirement of the light intensity of the current environment detected by the light detection module 1, which is beneficial for the electronic device applying the display panel to achieve a full-screen.
Alternatively, the light detection module 1 may include a light detection unit 11 disposed in an environment with incident light and a reference signal generation unit 12 disposed in an environment without incident light, the light detection unit 11 is connected to the power supply module 2 and the brightness adjustment module 3, as shown in fig. 2, the light detection unit 11 may be formed by arranging N TFTs (e.g., TFT1, TFT 2,....... and TFTN) in parallel, the light detection unit 11 is configured to receive an operating voltage and detect light intensity of the environment with incident light, and generate a corresponding first electrical signal Iin1 according to the light intensity of the environment with incident light, N being an integer greater than or equal to 2; the reference signal generating unit 12 is connected to the power supply module 2 and the brightness adjusting module 3, as shown in fig. 2, the reference signal generating unit 12 may be formed by arranging N TFTs (for example, TFT11, TFT 12, TFT1N) in parallel, and the reference signal generating unit 12 is configured to receive the operating voltage and generate a reference electrical signal Iin2 corresponding to a non-incident light environment; wherein, the first electrode voltage of the TFT in the light detection unit 11 is the same as the first electrode voltage of the TFT in the reference signal generation unit 12, the controller voltage of the TFT in the light detection unit 11 is the same as the controller voltage of the TFT in the reference signal generation unit 12, the sum of the second pole currents of N TFTs in the light detection unit 11 is used as the first electric signal Iin1 corresponding to the light intensity of the current environment, and the sum of the second pole currents of N TFTs in the reference signal generation unit 12 is used as the reference electric signal Iin2 corresponding to the light intensity of the current environment. Further, the N TFTs in the photodetection unit 11 and the N TFTs in the reference signal generating unit 12 are TFTs having the same parameter to realize the reference signal generating unit 12 as a collating unit of the photodetection unit 11.
Alternatively, any light shielding structure may be provided outside the reference signal generation unit 12 to realize that the reference signal generation unit 12 is in the non-incident light environment.
Specifically, if the TFT is a P-type TFT, the source terminal voltage of the TFT in the light detection unit 11 is the same as the source terminal voltage of the TFT in the reference signal generation unit 12, the gate terminal voltage of the TFT in the light detection unit 11 is the same as the gate terminal voltage of the TFT in the reference signal generation unit 12, the power supply module 2 provides the source terminal voltage of the TFT and the gate terminal voltage of the TFT, the sum of drain terminal currents of N TFTs in the light detection unit 11 is used as the first electrical signal Iin1 corresponding to the light intensity of the current environment, and the sum of drain terminal currents of N TFTs in the reference signal generation unit 12 is used as the reference electrical signal Iin2 corresponding to the light intensity of the current environment.
Correspondingly, if the TFT is an N-type TFT, the drain terminal voltage of the TFT in the light detection unit 11 is the same as the drain terminal voltage of the TFT in the reference signal generation unit 12, the gate terminal voltage of the TFT in the light detection unit 11 is the same as the gate terminal voltage of the TFT in the reference signal generation unit 12, the power supply module 2 provides the drain terminal voltage of the TFT and the gate terminal voltage of the TFT, the sum of the source terminal currents of N TFTs in the light detection unit 11 is used as the first electrical signal Iin1 corresponding to the light intensity of the current environment, and the sum of the source terminal currents of N TFTs in the reference signal generation unit 12 is used as the reference electrical signal Iin2 corresponding to the light intensity of the current.
Wherein, because the difference of the position of the TFT, the deviation caused by the temperature change to the current-voltage characteristic curve of the TFT, etc., will affect the accuracy of detecting the light intensity of the current environment by the light detection module 1, and in order to eliminate the above-mentioned factors and improve the accuracy of detecting the light intensity of the current environment by the light detection module 1, the light detection module 1 is configured to include the first electrical signal Iin1 corresponding to the light intensity of the light detection unit 11 under the environment with incident light and the reference electrical signal Iin2 corresponding to the environment without incident light generated by the reference signal generation unit 12 under the environment without incident light, because the other parameters of the light detection unit 11 and the reference signal generation unit 12 are basically consistent except for the different illumination parameters, the difference between the first electrical signal Iin1 and the reference electrical signal Iin2 is only caused by the different illumination parameters, so that the reference electrical signal Iin2 corresponding to the environment without incident light can be used as the second electrical signal Iin2 corresponding to the light intensity of the light A reference value of the electrical signal Iin1 to improve the accuracy of the light detection module 1 detecting the light intensity of the current environment.
In addition, since manufacturing errors exist in the TFT manufacturing process and resistance differences exist among the TFTs, the light detection unit 11 is formed by arranging N TFTs in parallel, the reference signal generation unit 12 is formed by arranging N TFTs in parallel, and the detected light intensity error caused by the TFT resistance differences can be effectively reduced, and since the output current of a single TFT is small, the sum of the second pole currents of the N TFTs in the light detection unit 11 is used as the first electric signal Iin1 corresponding to the light intensity of the current environment, and the sum of the second pole currents of the N TFTs in the reference signal generation unit 12 is used as the reference electric signal Iin2 corresponding to the light intensity of the current environment, which is beneficial for the brightness adjustment module 3 to acquire the first electric signal Iin1 and the reference electric signal Iin 2.
Alternatively, the display panel may include a light emitting module 5 and a light emitting driving module 6, the light emitting driving module 6 is used for driving the light emitting module 5, as shown in fig. 3, the brightness adjusting module 3 may include a signal processing module 31 and a driving signal generating module 32, the signal processing module 31 is respectively connected with the light detecting unit 11 and the reference signal generating unit 12, the signal processing module 31 is configured to amplify the first electric signal Iin1 and the reference electric signal Iin2, and obtain a first signal difference value Vout between the amplified first electric signal Iin1 and the reference electric signal Iin 2; the driving signal generating module 32 is respectively connected to the signal processing module 31 and the light-emitting driving module 6, the driving signal generating module 32 is configured to determine a first driving signal Vled for driving the light-emitting module 5 according to the first signal difference Vout, and send the first driving signal Vled to the light-emitting driving module 6, and the light-emitting driving module 6 drives the light-emitting module 5 with the first driving signal Vled, so as to adjust the display brightness of the display panel.
Specifically, the signal processing module 31 and the driving signal generating module 32 may be constituted by any circuit, and/or by any chip.
Specifically, since the currents of the first electrical signal Iin1 output by the light detection unit 11 and the reference electrical signal Iin2 output by the reference signal generation unit 12 are small, the currents output by the light detection unit 11 and the reference signal generation unit 12 are inconvenient to process, and thus the currents output by the light detection unit 11 and the reference signal generation unit 12 are amplified by the signal processing module 31, respectively.
Specifically, since the current output by the reference signal generation unit 12 is used as the reference value of the current output by the light detection unit 11, the driving signal generation module 32 determines the first driving signal Vled for driving the light emitting module 5 according to the first signal difference Vout, and the accuracy of determining the first driving signal Vled for driving the light emitting module 5 can be improved.
Alternatively, as shown in fig. 4, the signal processing module 31 may include: a first operational amplifier OP1, a first input terminal of the first operational amplifier OP1 being connected to the light detecting unit 11, a second input terminal of the first operational amplifier OP1 being grounded, the first operational amplifier OP1 being configured to amplify the first electrical signal Iin1 into a first voltage V1; a second operational amplifier OP2, a first input terminal of the second operational amplifier OP2 being connected to the reference signal generating unit 12, a second input terminal of the second operational amplifier OP2 being grounded, the second operational amplifier OP2 being configured to amplify the reference electrical signal Iin2 into a second voltage V2; a subtractor OP3, a first input terminal of the subtractor OP3 is connected to the output terminal of the first operational amplifier OP1, a second input terminal of the subtractor OP3 is connected to the output terminal of the second operational amplifier OP2, and the subtractor OP3 is configured to subtract the first voltage V1 and the second voltage V2 into a first voltage difference value, which is used as the first signal difference value Vout.
In an embodiment of the present invention, as shown in fig. 4, the signal processing module 31 may further include: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14. One end of the first resistor R1 is connected to the photodetection unit 11, and the other end of the first resistor R1 is connected to the first input terminal of the first operational amplifier OP 1; one end of the second resistor R2 is connected with the other end of the first resistor R1, and the other end of the second resistor R2 is grounded; one end of the third resistor R3 is connected with one end of the first resistor R1, and the other end of the third resistor R3 is grounded; one end of the fourth resistor R4 is connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is connected to the second input terminal of the first operational amplifier OP 1; one end of the fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is connected to the output terminal of the first operational amplifier OP 1. One end of the sixth resistor R6 is connected to the reference signal generating unit 12, and the other end of the sixth resistor R6 is connected to the first input terminal of the second operational amplifier OP 2; one end of the seventh resistor R7 is connected with the other end of the sixth resistor R6, and the other end of the seventh resistor R7 is grounded; one end of the eighth resistor R8 is connected with one end of the sixth resistor R6, and the other end of the eighth resistor R8 is grounded; one end of the ninth resistor R9 is connected to the other end of the eighth resistor R8, and the other end of the ninth resistor R9 is connected to the second input terminal of the second operational amplifier OP 2; one end of the tenth resistor R10 is connected to the other end of the ninth resistor R9, and the other end of the tenth resistor R10 is connected to the output terminal of the second operational amplifier OP 2. One end of the eleventh resistor R11 is connected to the output end of the first operational amplifier OP1, and the other end of the eleventh resistor R11 is connected to the first input end of the subtractor OP 3; one end of the twelfth resistor R12 is connected with the other end of the eleventh resistor R11, and the other end of the twelfth resistor R12 is grounded; one end of the thirteenth resistor R13 is connected to the output end of the second operational amplifier OP2, and the other end of the thirteenth resistor R13 is connected to the second input end of the subtractor OP 3; one end of a fourteenth resistor R14 is connected with the other end of the thirteenth resistor R13, and the other end of the fourteenth resistor R14 is connected with the output end of the subtractor OP 3; the power supply terminal of the first operational amplifier OP1, the power supply terminal of the second operational amplifier OP2 and the power supply terminal of the subtractor OP3 input an eighth voltage V8, wherein the eighth voltage V8 may be provided by the power supply module 2. The third resistor R3 converts the first electrical signal Iin1 into a voltage signal, and the eighth resistor R8 converts the reference electrical signal Iin2 into a voltage signal.
The resistance of the first resistor R1, the resistance of the fourth resistor R4, the resistance of the sixth resistor R6, and the resistance of the ninth resistor R9 may be the same, the resistance of the second resistor R2, the resistance of the fifth resistor R5, the resistance of the seventh resistor R7, and the resistance of the tenth resistor R10 may be the same, and the resistance of the third resistor R3 and the resistance of the eighth resistor R8 may be the same. The resistance of the eleventh resistor R11, the resistance of the twelfth resistor R12, the resistance of the thirteenth resistor R13, and the resistance of the fourteenth resistor R14 may be the same. Optionally, the resistance of the first resistor R1 may be much larger than that of the third resistor R3, and the resistance of the sixth resistor R6 may be much larger than that of the eighth resistor R8, so as to ensure that the current signals output by the light detection unit 11 all flow through the third resistor R3, and the current signals output by the reference signal generation unit 12 all flow through the eighth resistor R8, thereby improving the accuracy of the first voltage difference.
When the first electrical signal Iin1 and the reference electrical signal Iin2 are too small, if the subtractor OP3 directly performs subtraction processing on the first electrical signal Iin1 and the reference electrical signal Iin2, the difference between the first electrical signal Iin1 and the reference electrical signal Iin2 is too small, which is not beneficial for the driving signal generation module 32 to recognize the difference. After the first electrical signal Iin1 and the reference electrical signal Iin2 are amplified by the first resistor R1, the fourth resistor R4, the sixth resistor R6, the ninth resistor R9, the second resistor R2, the fifth resistor R5, the seventh resistor R7, the tenth resistor R10, the first operational amplifier OP1 and the second operational amplifier OP2, the first voltage difference can be easily identified by the driving signal generating module 32.
Specifically, the first input terminal voltage Vin1 ═ Iin1 × R3 of the first operational amplifier OP1, where R3 is the resistance value of the third resistor, and the first input terminal voltage Vin2 ═ Iin2 × R8 of the second operational amplifier OP2, where R8 is the resistance value of the eighth resistor.
Specifically, the output terminal voltage V1 of the first operational amplifier OP1 is (R5/R1) × Vin1, where R5 is the resistance value of the fifth resistor, R1 is the resistance value of the first resistor, the output terminal voltage V2 of the second operational amplifier OP2 is (R10/R6) × Vin2, where R6 is the resistance value of the sixth resistor, R10 is the resistance value of the tenth resistor, the first input terminal voltage of the subtractor OP3 is V1, the second input terminal voltage of the subtractor OP3 is V2, and the output terminal voltage of the subtractor 3 is Vout.
In an embodiment of the invention, the resistance of the first resistor R1, the resistance of the fourth resistor R4, the resistance of the sixth resistor R6, and the resistance of the ninth resistor R9 may be 100K ohms, the resistance of the second resistor R2, the resistance of the fifth resistor R5, the resistance of the seventh resistor R7, and the resistance of the tenth resistor R10 may be 2M ohms, the resistance of the third resistor R3 and the resistance of the eighth resistor R8 may be 2K ohms, the resistance of the eleventh resistor R11, the resistance of the twelfth resistor R12, the resistance of the thirteenth resistor R13, and the resistance of the fourteenth resistor R14 may be 100K ohms, and the first operational amplifier OP1, the second operational amplifier OP2, and the subtractor OP3 may be a chip OPA 177. Thus, the first operational amplifier OP1 can amplify the voltage signal converted by the first electrical signal Iin1 by 20 times, and the second operational amplifier OP2 can amplify the voltage signal converted by the reference electrical signal Iin2 by 20 times. Assuming that the first electrical signal Iin1 is a current in the range of 70uA to 100uA, the first operational amplifier OP1 outputs the first voltage V1 in the range of 140mV to 200 mV. Assume that the difference between the first electrical signal Iin1 and the reference electrical signal Iin2 is in the range of 2.5uA to 30uA, or the difference between the converted voltage signal of the first electrical signal Iin1 and the converted voltage signal of the reference electrical signal Iin2 is in the range of 5mV to 60 mV. The first voltage difference range output by the subtractor OP3 is 0.1V to 1.2V, and falls within the voltage range recognizable by the driving signal generating module 32. In one embodiment of the present invention, the voltage range recognizable by the driving signal generation module 32 may be 0.1V to 2.5V.
Alternatively, as shown in fig. 3, the driving signal generating module 32 may include a memory 321 and a controller 322, the memory 321 being configured to store a mapping relationship between the signal difference and the driving signal; the controller 322 is connected to the signal processing module 31 and the memory 321, respectively, and the controller 322 is configured to determine a first driving signal Vled corresponding to the first signal difference Vout according to the first signal difference Vout and the mapping relationship, and send the first driving signal Vled to the light-emitting driving module 6. Alternatively, the driving signal may be a PWM signal or other signals, and if the driving signal is a PWM signal, the mapping relationship between the signal difference and the driving signal may be a mapping relationship between the signal difference and a duty ratio of the PWM signal. Alternatively, the memory 321 and the controller 322 may be the existing memory and controller in the display panel, or may be an additional memory and controller.
Wherein each drive signal may be mapped to a signal difference value, or each drive signal may be mapped to a signal difference value range. When each driving signal is mapped to one signal difference range, the controller 322 determines the first driving signal Vled corresponding to the signal difference range where the first signal difference Vout is located according to the sum mapping relationship of the signal difference ranges where the first signal difference Vout is located, and the first driving signal Vled is used as the first driving signal Vled corresponding to the first signal difference Vout.
Optionally, the power supply module 2 may be further configured to provide a third voltage V3 and a fourth voltage V4, as shown in fig. 3, the luminance controlling apparatus may further include a timing generation module 6, the timing generation module 6 is respectively connected to the gate of the TFT and the power supply module 2, the timing generation module 6 is configured to generate a first timing signal gateburst, and each clock cycle of the first timing signal gateburst may include a high level signal corresponding to the third voltage V3 and a low level signal corresponding to the fourth voltage V4. Because each clock cycle of the first timing signal gateburst includes a high level signal corresponding to the third voltage V3 and a low level signal corresponding to the fourth voltage V4, the TFT may be turned on or off when the first timing signal gateburst is a high level signal corresponding to the third voltage V3, and the TFT may be turned off or on correspondingly when the first timing signal gateburst is a low level signal corresponding to the fourth voltage V4, thereby preventing the TFT from drifting under a high level signal corresponding to the third voltage V3 and ambient light for a long time, and enabling the TFT to operate more stably. In one embodiment of the present invention, the fourth voltage V4 is a negative voltage, for example, the third voltage V3 may be +10V and the fourth voltage V4 may be-10V.
Alternatively, the timing generation module 6 may include a timer 61 and a level conversion unit 62, where the timer 61 is configured to generate a square wave timing reference signal OUTPUT, and each clock cycle of the square wave timing reference signal OUTPUT includes a high level signal corresponding to a fifth voltage and a low level signal corresponding to a sixth voltage; the level converting unit 62 is respectively connected to the timer 61, the power supply module 2 and the control electrode of the TFT, and the level converting unit 62 is configured to convert a high level signal corresponding to the fifth voltage into a high level signal corresponding to the third voltage V3, convert a low level signal corresponding to the sixth voltage into a low level signal corresponding to the fourth voltage V4, and use the converted square wave timing reference signal OUTPUT as the first timing signal gateoutput, where the first timing signal gateoutput is a square wave timing signal synchronized with the square wave timing reference signal OUTPUT. The third voltage V3 is greater than the fifth voltage, and the fourth voltage V4 is greater than the sixth voltage.
Specifically, the power supply module 2 and the level conversion unit 62 may be constituted by any circuit or any chip.
In an embodiment of the present invention, if the TFT is a P-type TFT, as shown in fig. 3, the power supply module 2 provides a source terminal voltage of the TFT, such as a seventh voltage V7, a third voltage V3 and a fourth voltage V4 in the first timing signal gatepull, and an eighth voltage V8., as shown in fig. 5, the power supply module 2 may include a first chip IC1, such as an RT6801, and a second chip IC2, such as an ANX6701, wherein the first chip IC1 provides a source terminal voltage of the TFT, such as a seventh voltage V7, such as a +12V, a fourth voltage V4, such as a-10V, and an eighth voltage V8, such as a +16V, the second chip IC2 provides a third voltage V3, such as a +10V, and the power supply voltages of the first chip IC1 and the second chip IC2 may each be a first logic voltage V84, such as a 3.3V, in fig. 5, the DVRP provides a signal OUTPUT by the first chip 1, in an OUTPUT pin, in an embodiment of the first chip IC 396, such as a timing signal, such as an outt 466, may provide a third chip IC 465, such as a timing signal OUTPUT by the third chip IC 466, such as an outt chip IC 465, such as an operation module 5, such as an outt 466, such as an operation IC 465, such.
Specifically, the calculation formula of the frequency of the square wave timing reference signal OUTPUT is as follows:
f is 1.44/[ (R15+2R16) C1], where f is the frequency of OUTPUT, R15 is the resistance of the fifteenth resistor R15, R16 is the resistance of the sixteenth resistor R16, and C1 is the capacitance of the first capacitor.
Specifically, the calculation formula of the duty ratio of the square wave timing reference signal OUTPUT is as follows:
d ═ R16/(R15+2R16), where D is the duty cycle of OUTPUT.
In an embodiment of the present invention, as shown in fig. 7, the level conversion unit 62 may include a fourth chip IC4, e.g., RT8935, a supply voltage of the fourth chip IC4 may be a first logic voltage V L, e.g., 3.3V, the fourth chip IC4 receives an OUTPUT signal OUTPUT by the third chip IC4, the fourth chip IC4 OUTPUTs a first timing signal gatepull-in an embodiment of the present invention, as shown in fig. 8, the driving signal generating module 32 may include a fifth chip IC4, e.g., STM32G070, having a memory 321 and a controller 322, the supply voltage of the fifth chip IC4 may be the first logic voltage V4, e.g., 3.3V, the fifth chip IC4 receives a first signal difference Vout, the fifth chip IC4 OUTPUTs a first driving signal vlled, the fifth chip IC4 may be connected to an MCU of the display panel, as shown in fig. 9, the light emitting driving module 6 may include a sixth light emitting diode driving voltage V4, e.g., a sixth light emitting diode driving signal input by a sixth light emitting diode 4, a second light emitting diode 4, a sixth light emitting diode driving voltage, e.g., a light emitting diode 72, a second light emitting diode driving signal driving voltage V4, a sixth driving signal driving circuit 4, a sixth diode 4, a light emitting diode 72, a light emitting diode driving circuit 4, e, a second light emitting diode 72, a second light emitting diode driving circuit 4, e, a second light emitting diode driving circuit 4, a light emitting diode driving circuit, a second light emitting diode 72, a second light emitting diode driving circuit 4, a second light emitting diode 72, a second light emitting diode driving circuit 4, a second light emitting diode.
In the above embodiments, the peripheral circuits of the first chip IC1, the second chip IC2, the third chip IC3, the fourth chip IC4, the fifth chip IC5 and the sixth chip IC6 are only exemplary circuits, and if the models of the first chip IC1, the second chip IC2, the third chip IC3, the fourth chip IC4, the fifth chip IC5 and the sixth chip IC6 are changed, the peripheral circuits of the first chip IC1, the second chip IC2, the third chip IC3, the fourth chip IC4, the fifth chip IC5 and the sixth chip IC6 are also adjusted accordingly.
Alternatively, the first chip IC1, the second chip IC2, the third chip IC3, the fourth chip IC4, and the fifth chip IC5 may be integrated in the same chip.
The brightness control device of the embodiment of the invention has the following advantages:
the brightness control device is arranged to be applied to a display panel and comprises a light detection module 1, a power supply module 2 and a brightness adjusting module 3, wherein the light detection module 1 comprises at least one TFT, and the light detection module 1 is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment; the power supply module 2 is connected with the light detection module 1, and the power supply module 2 is configured to provide an operating voltage of the light detection module 1; the brightness adjusting module 3 is connected with the light detecting module 1, and the brightness adjusting module 3 is configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment; the display brightness of the display panel is adjusted according to the light intensity of the current environment, and the light detection module 1 comprises at least one TFT, the cost of the light detection module 1 module is far less than that of the photosensitive sensor, so that the cost of adjusting the display brightness of the display panel is effectively reduced, in addition, the brightness control device is applied to the display panel, namely the display panel comprises the light detection module 1, the light detection module 1 is not independent of the display panel, the electronic equipment applying the display panel is favorable for realizing the function integration of the whole electronic equipment, the display panel does not need to be provided with a through hole for the light detection module 1, and the electronic equipment applying the display panel is favorable for realizing a full-screen;
the set light detection module 1 comprises a light detection unit 11 arranged in an environment with incident light and a reference signal generation unit 12 arranged in an environment without incident light, wherein the light detection unit 11 is formed by arranging N TFTs in parallel, the reference signal generation unit 12 is formed by arranging N TFTs in parallel, the first electrode voltage of the TFTs in the light detection unit 11 is the same as the first electrode voltage of the TFTs in the reference signal generation unit 12, the control electrode voltage of the TFTs in the light detection unit 11 is the same as the control electrode voltage of the TFTs in the reference signal generation unit 12, the sum of the second electrode currents of the N TFTs in the light detection unit 11 is used as a first electric signal Iin1 corresponding to the light intensity of the current environment, and the sum of the second electrode currents of the N TFTs in the reference signal generation unit 12 is used as a reference electric signal Iin2 corresponding to the light intensity of the current. Therefore, the influence of factors such as difference of positions of the TFTs, deviation of temperature change to volt-ampere characteristic curves of the TFTs, impedance difference among the TFTs, small output current of the TFTs and the like on the accuracy of the light intensity of the current environment detected by the light detection module 1 can be eliminated, and the accuracy of the light intensity of the current environment detected by the light detection module 1 can be improved;
the brightness control device comprises a time sequence generating module 6, the time sequence generating module 6 provides a first time sequence signal gateburst for a control electrode of the TFT, and each clock cycle of the first time sequence signal gateburst may include a high level signal corresponding to a third voltage V3 and a low level signal corresponding to a fourth voltage V4, so that a phenomenon that the TFT is subjected to a high level signal corresponding to the third voltage V3 for a long time and under ambient light, a volt-ampere characteristic curve drifts occurs, and the TFT operates more stably.
The embodiment of the invention also discloses a display panel which comprises the brightness control device.
For the embodiment of the display panel, since it includes the above-mentioned brightness control device, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the embodiment of the brightness control device.
The display panel of the embodiment of the invention has the following advantages:
the brightness control device is arranged to be applied to a display panel and comprises a light detection module 1, a power supply module 2 and a brightness adjusting module 3, wherein the light detection module 1 comprises at least one TFT, and the light detection module 1 is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment; the power supply module 2 is connected with the light detection module 1, and the power supply module 2 is configured to provide an operating voltage of the light detection module 1; the brightness adjusting module 3 is connected with the light detecting module 1, and the brightness adjusting module 3 is configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment; the display brightness of the display panel is adjusted according to the light intensity of the current environment, and the light detection module 1 comprises at least one TFT, the cost of the light detection module 1 module is far less than that of the photosensitive sensor, so that the cost of adjusting the display brightness of the display panel is effectively reduced, in addition, the brightness control device is applied to the display panel, namely the display panel comprises the light detection module 1, the light detection module 1 is not independent of the display panel, the electronic equipment applying the display panel is favorable for realizing the function integration of the whole electronic equipment, the display panel does not need to be provided with a through hole for the light detection module 1, and the electronic equipment applying the display panel is favorable for realizing a full-screen;
the set light detection module 1 comprises a light detection unit 11 arranged in an environment with incident light and a reference signal generation unit 12 arranged in an environment without incident light, wherein the light detection unit 11 is formed by arranging N TFTs in parallel, the reference signal generation unit 12 is formed by arranging N TFTs in parallel, the first electrode voltage of the TFTs in the light detection unit 11 is the same as the first electrode voltage of the TFTs in the reference signal generation unit 12, the control electrode voltage of the TFTs in the light detection unit 11 is the same as the control electrode voltage of the TFTs in the reference signal generation unit 12, the sum of the second electrode currents of the N TFTs in the light detection unit 11 is used as a first electric signal Iin1 corresponding to the light intensity of the current environment, and the sum of the second electrode currents of the N TFTs in the reference signal generation unit 12 is used as a reference electric signal Iin2 corresponding to the light intensity of the current. Therefore, the influence of factors such as difference of positions of the TFTs, deviation of temperature change to volt-ampere characteristic curves of the TFTs, impedance difference among the TFTs, small output current of the TFTs and the like on the accuracy of the light intensity of the current environment detected by the light detection module 1 can be eliminated, and the accuracy of the light intensity of the current environment detected by the light detection module 1 can be improved;
the brightness control device comprises a time sequence generating module 6, the time sequence generating module 6 provides a first time sequence signal gateburst for a control electrode of the TFT, and each clock cycle of the first time sequence signal gateburst may include a high level signal corresponding to a third voltage V3 and a low level signal corresponding to a fourth voltage V4, so that a phenomenon that the TFT is subjected to a high level signal corresponding to the third voltage V3 for a long time and under ambient light, a volt-ampere characteristic curve drifts occurs, and the TFT operates more stably.
The embodiment of the invention also discloses a control method of the brightness control device, which comprises a power-on stage T1, a working stage T2 and a power-off stage T3, wherein the power supply module 2 is started in the power-on stage T1; in the working period T2, the power supply module 2 supplies the working voltage of the light detection module 1; in the power-down phase T3, the power supply module 2 is turned off.
Alternatively, the brightness control device may include a timing generation module 6, which provides the operating voltage of the light detection module 1 through the power supply module 2 during the operating period T2, and includes:
in the operation phase T2, the power supply module 2 supplies a seventh voltage V7 to a first electrode, e.g., a source terminal or a drain terminal, of the TFT in the photodetection module 1, and the power supply module 2 supplies the third voltage V3 and the fourth voltage V4 to the timing generation module 6, and the timing generation module 6 supplies the first timing signal gateburst to the control electrode of the TFT.
In an embodiment of the present invention, waveforms of signals during the power-up phase T1, the working phase T2 and the power-down phase T3 are shown in fig. 10.
The control method of the embodiment of the invention has the following advantages: the brightness control device is arranged to be applied to a display panel and comprises a light detection module 1, a power supply module 2 and a brightness adjusting module 3, wherein the light detection module 1 comprises at least one TFT, and the light detection module 1 is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment; the power supply module 2 is connected with the light detection module 1, and the power supply module 2 is configured to provide an operating voltage of the light detection module 1; the brightness adjusting module 3 is connected with the light detecting module 1, and the brightness adjusting module 3 is configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment; the display brightness of the display panel is adjusted according to the light intensity of the current environment, and the light detection module 1 comprises at least one TFT, the cost of the light detection module 1 module is far less than that of the photosensitive sensor, so that the cost of adjusting the display brightness of the display panel is effectively reduced, in addition, the brightness control device is applied to the display panel, namely the display panel comprises the light detection module 1, the light detection module 1 is not independent of the display panel, the electronic equipment applying the display panel is favorable for realizing the function integration of the whole electronic equipment, the display panel does not need to be provided with a through hole for the light detection module 1, and the electronic equipment applying the display panel is favorable for realizing a full-screen;
the set light detection module 1 comprises a light detection unit 11 arranged in an environment with incident light and a reference signal generation unit 12 arranged in an environment without incident light, wherein the light detection unit 11 is formed by arranging N TFTs in parallel, the reference signal generation unit 12 is formed by arranging N TFTs in parallel, the first electrode voltage of the TFTs in the light detection unit 11 is the same as the first electrode voltage of the TFTs in the reference signal generation unit 12, the control electrode voltage of the TFTs in the light detection unit 11 is the same as the control electrode voltage of the TFTs in the reference signal generation unit 12, the sum of the second electrode currents of the N TFTs in the light detection unit 11 is used as a first electric signal Iin1 corresponding to the light intensity of the current environment, and the sum of the second electrode currents of the N TFTs in the reference signal generation unit 12 is used as a reference electric signal Iin2 corresponding to the light intensity of the current. Therefore, the influence of factors such as difference of positions of the TFTs, deviation of temperature change to volt-ampere characteristic curves of the TFTs, impedance difference among the TFTs, small output current of the TFTs and the like on the accuracy of the light intensity of the current environment detected by the light detection module 1 can be eliminated, and the accuracy of the light intensity of the current environment detected by the light detection module 1 can be improved;
the brightness control device comprises a time sequence generating module 6, the time sequence generating module 6 provides a first time sequence signal gateburst for a control electrode of the TFT, and each clock cycle of the first time sequence signal gateburst may include a high level signal corresponding to a third voltage V3 and a low level signal corresponding to a fourth voltage V4, so that a phenomenon that the TFT is subjected to a high level signal corresponding to the third voltage V3 for a long time and under ambient light, a volt-ampere characteristic curve drifts occurs, and the TFT operates more stably.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The present invention provides a brightness control device, a display panel and a control method of the brightness control device, which are introduced in detail above, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (11)
1. A brightness control device applied to a display panel is characterized by comprising a light detection module, a power supply module and a brightness adjusting module, wherein,
the light detection module comprises at least one TFT, and is configured to detect the light intensity of the current environment and generate a corresponding electric signal according to the light intensity of the current environment;
the power supply module is connected with the light detection module and is configured to provide working voltage of the light detection module;
the brightness adjusting module is connected with the light detection module and configured to adjust the display brightness of the display panel according to the electric signal corresponding to the light intensity of the current environment.
2. The luminance control device as claimed in claim 1, wherein the display panel includes an array substrate, and the light detection module is integrated on the array substrate.
3. The luminance control device according to claim 1 or 2, wherein the light detection module includes a light detection unit provided in an environment with incident light and a reference signal generation unit provided in an environment without incident light,
the light detection unit is respectively connected with the power supply module and the brightness adjustment module, is formed by arranging N TFTs in parallel, is configured to receive the working voltage and detect the light intensity of the incident light environment, and generates a corresponding first electric signal according to the light intensity of the incident light environment; n is an integer greater than or equal to 2;
the reference signal generating unit is respectively connected with the power supply module and the brightness adjusting module, is formed by arranging N TFTs in parallel, and is configured to receive the working voltage and generate a reference electric signal corresponding to the non-incident light environment;
the first electrode voltage of the TFT in the light detection unit is the same as the first electrode voltage of the TFT in the reference signal generation unit, the control electrode voltage of the TFT in the light detection unit is the same as the control electrode voltage of the TFT in the reference signal generation unit, the sum of the second pole currents of the N TFTs in the light detection unit is used as the first electric signal corresponding to the light intensity of the current environment, and the sum of the second pole currents of the N TFTs in the reference signal generation unit is used as the reference electric signal corresponding to the light intensity of the current environment.
4. The luminance control device according to claim 3, wherein the display panel includes a light emitting module and a light emission driving module, the luminance adjusting module includes a signal processing module and a driving signal generating module,
the signal processing module is respectively connected with the light detection unit and the reference signal generation unit, and is configured to amplify the first electric signal and the reference electric signal and acquire a first signal difference value between the amplified first electric signal and the reference electric signal;
the driving signal generation module is respectively connected with the signal processing module and the light-emitting driving module, and is configured to determine a first driving signal for driving the light-emitting module according to the first signal difference and send the first driving signal to the light-emitting driving module.
5. The luminance control apparatus according to claim 4, wherein the signal processing module comprises:
a first operational amplifier, a first input end of which is connected with the light detection unit, a second input end of which is grounded, and which is configured to amplify the first electrical signal into a first voltage;
a second operational amplifier, a first input end of which is connected to the reference signal generating unit, a second input end of which is grounded, and which is configured to amplify the reference electrical signal into a second voltage;
a subtractor, a first input terminal of which is connected to an output terminal of the first operational amplifier, a second input terminal of which is connected to an output terminal of the second operational amplifier, the subtractor being configured to subtract the first voltage and the second voltage into a first voltage difference value, the first voltage difference value being the first signal difference value.
6. The luminance control device according to claim 4, wherein the driving signal generating module includes a memory and a controller,
the memory is configured to store a mapping between the signal difference and the drive signal;
the controller is respectively connected with the signal processing module and the memory, and the controller is configured to determine the first driving signal corresponding to the first signal difference value according to the first signal difference value and the mapping relation, and send the first driving signal to the light-emitting driving module.
7. The luminance control device according to claim 1, wherein the power supply module is further configured to supply a third voltage and a fourth voltage, the luminance control device further comprising a timing generation module,
the timing generation module is respectively connected with the control electrode of the TFT and the power supply module, and is configured to generate a first timing signal, wherein each clock cycle of the first timing signal comprises a high level signal corresponding to a third voltage and a low level signal corresponding to a fourth voltage.
8. The luminance control apparatus according to claim 7, wherein the timing generation block includes a timer and a level conversion unit,
the timer is configured to generate a square wave timing reference signal, wherein each clock cycle of the square wave timing reference signal comprises a high-level signal corresponding to a fifth voltage and a low-level signal corresponding to a sixth voltage;
the level conversion unit is respectively connected with the timer, the power supply module and the control electrode of the TFT, and is configured to convert a high level signal corresponding to the fifth voltage into a high level signal corresponding to the third voltage, convert a low level signal corresponding to the sixth voltage into a low level signal corresponding to the fourth voltage, and use the converted square wave timing reference signal as the first timing signal.
9. A display panel comprising the luminance control apparatus as claimed in any one of claims 1 to 8.
10. A control method of a luminance controlling apparatus according to any one of claims 1 to 8, comprising a power-up phase, an operating phase, and a power-down phase, in which a power supply module is started; in the working phase, providing a working voltage of the light detection module through the power supply module; and in the power-down stage, the power supply module is turned off.
11. The control method according to claim 10, wherein the brightness control device comprises a timing generation module, and the providing an operating voltage of the light detection module by the power supply module in the operating phase comprises:
in the working phase, a seventh voltage is provided for the first electrode of the TFT in the light detection module through the power supply module, the third voltage and the fourth voltage are provided for the time sequence generation module through the power supply module, and a first time sequence signal is provided for the control electrode of the TFT through the time sequence generation module.
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