CN112397034A - Dimming control circuit and display device - Google Patents
Dimming control circuit and display device Download PDFInfo
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- CN112397034A CN112397034A CN202011204713.1A CN202011204713A CN112397034A CN 112397034 A CN112397034 A CN 112397034A CN 202011204713 A CN202011204713 A CN 202011204713A CN 112397034 A CN112397034 A CN 112397034A
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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
Abstract
The invention discloses a dimming control circuit and display equipment, wherein the dimming control circuit comprises a main chip, a dimming selection module and a brightness adjusting module; the main chip is respectively connected with the dimming selection module and the brightness adjustment module; the main chip is used for outputting a dimming control signal to the dimming selection module and outputting a brightness adjusting signal to the brightness adjusting module; the dimming selection module is used for selecting the main chip to be in a first dimming mode or a second dimming mode according to the dimming control signal; the brightness adjusting module is used for outputting a corresponding dimming signal according to the brightness adjusting signal and adjusting the backlight brightness; the invention realizes that a single main board can be matched with a constant current board or a liquid crystal screen of a PWM dimming mode and a DC dimming mode, improves the compatibility of the main board and also avoids the problem of wrong use of the main board in the BOM of the whole machine.
Description
Technical Field
The invention relates to the technical field of LED dimming, in particular to a dimming control circuit and display equipment.
Background
The existing backlight dimming circuit comprises a backlight brightness control circuit and a dimming mode selection capacitor, and when the backlight brightness is required to be adjusted, a main chip outputs a high level signal or a low level signal to a constant current plate to complete backlight brightness adjustment; when the capacitor is selected not to be pasted, the output of the main board is in a PWM dimming mode, the corresponding software is required to be configured in the PWM dimming mode, when the capacitor is selected to be pasted, the output of the main board is in a DC dimming mode, and the corresponding software is required to be configured in the DC dimming mode. The actual corresponding main boards are divided into two types of PWM dimming and DC dimming, two types of main board materials exist, the wrong main board is easily used in the later actual complete machine BOM (Bill of Material: Bill of Material), the liquid crystal screen cannot be lightened, and the main board is troublesome to replace; in addition, in the aspect of software matching, a one-to-one correspondence is required, that is, a main board, main board software, and a constant current board/liquid crystal panel, and these three need to be implemented in a one-to-one correspondence, for example, a main board for PWM dimming, and software for matching a PWM dimming manner are required, and a constant current board/liquid crystal panel at the rear end also needs to be PWM dimming, if one of the three items is not correspondingly matched, the liquid crystal panel cannot be lit, so that the compatibility of the main board for setting the backlight dimming circuit is poor.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a dimming control circuit and a display device, so that a single main board can be matched with a constant current board or a liquid crystal display in a PWM dimming mode and a DC dimming mode, thereby improving compatibility of the main board and avoiding a problem of wrong use of the main board in a complete machine BOM.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dimming control circuit comprises a main chip, a dimming selection module and a brightness adjustment module; the main chip is respectively connected with the dimming selection module and the brightness adjustment module; the main chip is used for outputting a dimming control signal to the dimming selection module and outputting a brightness adjusting signal to the brightness adjusting module; the dimming selection module is used for selecting the main chip to be in a first dimming mode or a second dimming mode according to the dimming control signal; the brightness adjusting module is used for outputting a corresponding dimming signal according to the brightness adjusting signal and adjusting the backlight brightness.
In the dimming control circuit, the dimming selection module comprises a switch unit and a dimming selection unit; the switch unit is respectively connected with the main chip and the dimming selection unit; the switch unit is used for switching off when the dimming control signal is a first level signal, controlling the dimming selection unit to select a first dimming mode, or switching on when the dimming control signal is a second level signal, controlling the dimming selection unit to select a second dimming mode.
In the dimming control circuit, the dimming selection module further comprises a protection unit, and the protection unit is respectively connected with the main chip and the switch unit; the protection unit is used for providing current-limiting protection for the switch unit.
In the dimming control circuit, the dimming selection module further comprises a pull-down unit; the pull-down unit is respectively connected with the protection unit and the main chip; the pull-down unit is used for controlling the dimming control signal to be a first level signal.
In the dimming control circuit, the switch unit comprises a switch tube, the first end of the switch tube is connected with the main chip, the second end of the switch tube is connected with the dimming selection unit, and the third end of the switch tube is grounded.
In the dimming control circuit, the dimming selection unit comprises a first capacitor, one end of the first capacitor is connected with the output end of the brightness adjustment module, and the other end of the first capacitor is connected with the switch unit.
In the dimming control circuit, the protection unit comprises a first resistor, one end of the first resistor is connected with the main chip, and the other end of the first resistor is connected with the switch unit.
In the dimming control circuit, the pull-down unit comprises a second resistor, one end of the second resistor is connected with the main chip and the protection unit, and the other end of the second resistor is grounded.
In the dimming control circuit, the brightness adjusting module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor and a triode; one end of the third resistor is connected with a first power supply end, the other end of the third resistor, one end of the fourth resistor and one end of the seventh resistor are all connected with the main chip, and the other end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor and the collector of the triode are all connected with a dimming signal output end and the dimming selection module; the other end of the seventh resistor and one end of the second capacitor are both connected with the base electrode of the triode, the other end of the second capacitor is grounded, and the emitting electrode of the triode is grounded; the other end of the fifth resistor is connected with a second power supply end, and the other end of the sixth resistor is connected with a third power supply end.
The utility model provides a display device, includes mainboard, constant current board and the display screen that connects gradually, be provided with on the mainboard as above dimming control circuit.
Compared with the prior art, the dimming control circuit and the display device provided by the invention have the advantages that the dimming control circuit comprises a main chip, a dimming selection module and a brightness adjusting module; the main chip is respectively connected with the dimming selection module and the brightness adjustment module; the main chip is used for outputting a dimming control signal to the dimming selection module and outputting a brightness adjusting signal to the brightness adjusting module; the dimming selection module is used for selecting the main chip to be in a first dimming mode or a second dimming mode according to the dimming control signal; the brightness adjusting module is used for outputting a corresponding dimming signal according to the brightness adjusting signal and adjusting the backlight brightness; the invention realizes that a single main board can be matched with a constant current board or a liquid crystal screen of a PWM dimming mode and a DC dimming mode, improves the compatibility of the main board and also avoids the problem of wrong use of the main board in the BOM of the whole machine.
Drawings
Fig. 1 is a block diagram of a display device according to the present invention;
fig. 2 is a schematic circuit diagram of a dimming control circuit according to the present invention.
Detailed Description
The invention aims to provide a dimming control circuit and display equipment, so that a single main board can be matched with a constant current board or a liquid crystal screen in a PWM (pulse-width modulation) dimming mode and a DC (direct current) dimming mode, the compatibility of the main board is improved, and the problem of wrong use of the main board in a complete machine BOM (bill of material) is also solved.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the display device provided by the present invention includes a main board 10, a constant current board 20, and a display screen 30, which are connected in sequence, wherein a dimming control circuit is disposed on the main board 10, and the dimming control circuit includes a main chip 100, a dimming selection module 200, and a brightness adjustment module 300; the main chip 100 is respectively connected with the dimming selection module 200 and the brightness adjustment module 300; the main chip 100 is configured to output a dimming control signal PWM/DC _ SEL _ LVDS to the dimming selection module 200 and output a Brightness adjustment signal BL _ Brightness _ LVDS to the Brightness adjustment module 300; the dimming selection module 200 is configured to select the main chip 100 as a first dimming mode or a second dimming mode according to the dimming control signal PWM/DC _ SEL _ LVDS; the Brightness adjusting module 300 is configured to output a corresponding dimming signal to the constant current board 20 according to the Brightness adjusting signal BL _ Brightness _ LVDS, and the constant current board 20 adjusts the backlight Brightness of the display screen 30 according to the dimming signal to adjust the backlight Brightness of the display screen 30.
In this embodiment, the first dimming mode is a PWM dimming mode, and the second dimming mode is a DC dimming mode; when the actual constant current board 20 or the display screen 30 is in the PWM dimming mode, the main chip 100 outputs the corresponding dimming control signal PWM/DC _ SEL _ LVDS to the dimming selection module 200 according to the software configuration of the dimming mode, and the dimming selection module 200 controls the dimming selection module 200 to select the main chip 100 as the PWM dimming mode, whereas when the actual constant current board 20 or the display screen 30 is in the DC dimming mode, the main chip 100 outputs the corresponding dimming control signal PWM/DC _ SEL _ LVDS to the dimming selection module 200 according to the software configuration of the dimming mode, and controls the dimming selection module 200 to select the main chip 100 as the DC dimming mode; therefore, different dimming modes are selected by setting the dimming control circuit in the main board 10 according to actual needs, and only the constant current board 20 or the display screen 30 is matched with the main board 10 through software, so that the main board 10 is fixedly configured, and different main board 10 configurations do not exist; that is, only one material number of the main board 10 exists, the wrong main board 10 cannot be used in the actual complete machine BOM at the later stage, the trouble that the main board 10 needs to be disassembled and replaced does not exist, and the abnormal condition that the screen cannot be replaced by the wrong main board 10 is solved; in the process of adapting the software of the main board 10, the software only needs to be adapted according to the dimming mode of the rear-end constant current board 20 or the display screen 30, and does not need to be in one-to-one correspondence with the main board 10 at the same time, so that software matching confusion is avoided, the problem that the screen cannot be lightened due to software adaptation errors is solved, and the compatibility of the main board 10 is improved; the main board 10 is fixedly configured, and manual welding of elements is not needed during debugging.
Further, when the main chip 100 performs dimming through the Brightness adjusting module 300, and the Brightness adjusting signal BL _ Brightness _ LVDS output by the main chip 100 is a high level signal, the Brightness adjusting module 300 outputs a low level dimming signal to the constant current board 20 according to the high level signal; when the Brightness adjusting signal BL _ Brightness _ LVDS output by the main chip 100 is a low level signal, the Brightness adjusting module 300 outputs a high level dimming signal to the constant current board 20 according to the low level signal; the constant current board 20 can correspondingly adjust different backlight brightness by identifying the high and low levels of the dimming signal to indicate that different voltages are received, so as to realize backlight brightness adjustment of the display screen 30; the model of the master chip in this embodiment is RK3288, but in other embodiments, a master chip having the same function may be selected, which is not limited in the present invention.
Further, referring to fig. 2, the dimming selection module 200 includes a switch unit 210 and a dimming selection unit 220; the switching unit 210 is connected to the main chip 100 and the dimming selection unit 220, respectively; the switch unit 210 is configured to switch off when the dimming control signal PWM/DC _ SEL _ LVDS is the first level signal, control the dimming selection unit 220 to select the first dimming mode, or switch on when the dimming control signal PWM/DC _ SEL _ LVDS is the second level signal, control the dimming selection unit 220 to select the second dimming mode, so as to implement correct matching of the constant current board 20 or the display screen 30 with different dimming modes at the rear end.
In the embodiment, the first level signal is a low level signal, and the second level signal is a high level signal; specifically, when the dimming control signal PWM/DC _ SEL _ LVDS output by the main chip 100 is a low level signal, the switch unit 210 is turned off, and the dimming selection unit 220 cannot be grounded and turned on through the switch unit 210, so that the main chip 100 realizes backlight adjustment in a PWM dimming manner through the brightness dimming module; when the dimming control signal PWM/DC _ SEL _ LVDS outputted by the main chip 100 is a high level signal, the switch unit 210 is turned on, and the dimming selection unit 220 is turned on through the switch unit 210 in a grounded manner, so that the main chip 100 realizes backlight adjustment of a DC dimming mode through the brightness dimming module, thereby completing effective selection of the dimming mode.
Further, the dimming selection module 200 further includes a protection unit 230, and the protection unit 230 is connected to the main chip 100 and the switch unit 210 respectively; the protection unit 230 is used for providing current-limiting protection for the switching unit 210, and the protection unit 230 is arranged between the switching unit 210 and the main chip 100, so that damage to a circuit due to excessive instantaneous current is avoided, and the safety of the dimming control circuit is further improved.
Further, the dimming selection module 200 further includes a pull-down unit 240; the pull-down unit 240 is connected to the protection unit 230 and the main chip 100, respectively; the pull-down unit 240 is configured to control the dimming control signal PWM/DC _ SEL _ LVDS to be a first level signal; the pull-down unit 240 is disposed in the dimming selection module 200, so that the dimming control signal PWM/DC _ SEL _ LVDS received by the dimming selection module 200 defaults to a low level signal, that is, the dimming control circuit defaults to a PWM dimming mode, which is equivalent to that the initial dimming mode of the motherboard 10 is the PWM dimming mode.
Further, the switching unit 210 includes a switching tube Q1, a first end of the switching tube Q1 is connected to the main chip 100, a second end of the switching tube Q1 is connected to the dimming selection unit 220, and a third end of the switching tube Q1 is grounded; in this embodiment, the switching transistor Q1 may be a MOS transistor, or may be another component having the same function, which is not limited in the present invention. In the corresponding embodiment, the first end is a grid electrode of the MOS tube, the second end is a drain electrode of the MOS tube, and the third end is a source electrode of the MOS tube; when the main chip 100 outputs the dimming control signal PWM/DC _ SEL _ LVDS as a low level signal, the gate voltage Vg of the MOS transistor is at a low level, and the source voltage Vs of the MOS transistor is grounded, so that the threshold voltage Vgs of the MOS transistor is Vg-Vs 0V, which does not satisfy the turn-on condition, and therefore the MOS transistor is in a cut-off state, and the drain of the MOS transistor cannot be turned on with the source, so that the dimming selection unit 220 is not grounded, and thus the main chip 100 outputs the PWM dimming mode through the brightness adjustment module 300; when the main chip 100 outputs the dimming control signal PWM/DC _ SEL _ LVDS as a high level signal, the gate voltage Vg of the MOS transistor is at a high level, and the source voltage Vs of the MOS transistor is grounded, so that the threshold voltage Vgs of the MOS transistor is Vg-Vs at a high level, which satisfies the conducting condition, and therefore the MOS transistor is in a conducting state, and flows from the drain to the source, that is, the drain and the source are conducted, so that the dimming selection unit 220 is grounded, and the main chip 100 outputs the DC dimming mode through the brightness adjustment module 300.
Further, the dimming selecting unit 220 includes a first capacitor C1, one end of the first capacitor C1 is connected to the output terminal of the brightness adjusting module 300, and the other end of the first capacitor C1 is connected to the second terminal of the switching tube Q1; the first capacitor C1 in this embodiment is a selection capacitor, and when the MOS transistor is in an off state, the first capacitor C1 cannot be grounded, and then the main chip 100 outputs a PWM dimming mode through the brightness adjustment module 300; when the MOS transistor is turned on, at this time, the first capacitor C1 is grounded through the MOS transistor, and then the main chip 100 outputs a DC dimming mode through the brightness adjusting module 300; the invention controls whether the MOS tube is conducted or not through software to realize whether the capacitor is grounded or not, thereby realizing different dimming mode selections; it should be noted that the components in the dimming control circuit on the motherboard 10 are fixed patches, different configurations are not distinguished, only one type of motherboard 10 exists, and the specific dimming mode is controlled and selected only by the motherboard 10 software.
Further, the protection unit 230 includes a first resistor R1, one end of the first resistor R1 is connected to the main chip 100, and the other end of the first resistor R1 is connected to the gate of the switching tube Q1; the first resistor R1 is a series resistor for protecting the switching tube Q1 and preventing the switching tube Q1 from being broken down by an excessive transient current, so as to improve the safety and reliability of the dimming control circuit.
Further, the pull-down unit 240 includes a second resistor R2, one end of the second resistor R2 is connected to the main chip 100 and the protection unit 230, and the other end of the second resistor R2 is grounded; the second resistor R2 is a pull-down circuit, so that the dimming control signal PWM/DC _ SEL _ LVDS defaults to a low level signal, i.e., a default PWM dimming mode.
Further, the brightness adjusting module 300 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, and a transistor Q2; one end of the third resistor R3 is connected to the first power supply terminal, the other end of the third resistor R3, one end of the fourth resistor R4 and one end of the seventh resistor R7 are all connected to the main chip 100, and the other end of the fourth resistor R4, one end of the fifth resistor R5, one end of the sixth resistor R6 and the collector of the transistor Q2 are all connected to the dimming signal output terminal and the dimming selection module 200; the other end of the seventh resistor R7 and one end of the second capacitor C2 are both connected with the base electrode of the triode Q2, the other end of the second capacitor C2 is grounded, and the emitting electrode of the triode Q2 is grounded; the other end of the fifth resistor R5 is connected with the second power supply end, and the other end of the sixth resistor R6 is connected with the third power supply end; in the invention, the main chip 100 controls the GPIO port to output high and low levels through software, so that the constant current board 20 receives the corresponding low and high levels, thereby adjusting the brightness of the display screen 30.
Specifically, when the Brightness adjustment signal BL _ Brightness _ LVDS output by the main chip 100 is at a high level, the dimming signal output to the constant current board 20 is a low level signal after being inverted by the transistor Q2; when the Brightness adjusting signal BL _ Brightness _ LVDS outputted from the main chip 100 is at a low level, and is inverted by the transistor Q2, the dimming signal outputted to the constant current board 20 is a high level signal, so that the constant current board 20 can adjust different backlight Brightness by recognizing the high and low levels of the dimming signal to indicate that different voltages are received.
Further, the dimming selection module 200 further includes an eighth resistor R8, one end of the eighth resistor R8 is connected to the other end of the first capacitor C1 and the second end of the switching tube Q1, the other end of the eighth resistor R8 is grounded, the eighth resistor R8 is a reserved ground resistor, when the main chip 100 is inconvenient to output the dimming control signal PWM/DC _ SEL _ LVDS, the dimming mode can be fixed by selecting the patch or not by the patch of the eighth resistor R8, when the eighth resistor R8 is not patch, the dimming mode is fixed to the PWM dimming mode, and when the eighth resistor R8 is patch, the dimming mode is fixed to the DC dimming mode.
The dimming control circuit is characterized in that a main chip controls whether an MOS tube is conducted or not through software to realize whether a selection capacitor is grounded or not, so that different dimming modes are selected; the components of the circuit are always pasted, different mainboard configurations do not exist, namely, only one mainboard is provided, software only needs to be matched according to the dimming mode of a rear-end constant current board or a display screen, and the mainboard software does not need to correspond to the dimming modes of the mainboard and the constant current board/a liquid crystal screen one by one; when the constant current board or the display screen is in the PWM dimming mode, the main chip outputs a dimming control signal with a low level through software control, and when the constant current board or the display screen is in the DC dimming mode, the main chip outputs a dimming control signal with a high level through software control, so that the main board is fixedly configured, namely, only one material number main board exists, the constant current board or the liquid crystal screen can be matched with the PWM dimming mode and the DC dimming mode, the compatibility of the main board is improved, and the problem of wrong use of the main board in the whole BOM is also avoided.
The present invention also provides a dimming control circuit, which is not described herein again because the dimming control circuit is described in detail above.
In summary, the present invention provides a dimming control circuit and a display device, wherein the dimming control circuit includes a main chip, a dimming selection module and a brightness adjustment module; the main chip is respectively connected with the dimming selection module and the brightness adjustment module; the main chip is used for outputting a dimming control signal to the dimming selection module and outputting a brightness adjusting signal to the brightness adjusting module; the dimming selection module is used for selecting the main chip to be in a first dimming mode or a second dimming mode according to the dimming control signal; the brightness adjusting module is used for outputting a corresponding dimming signal according to the brightness adjusting signal and adjusting the backlight brightness; the invention realizes that a single main board can be matched with a constant current board or a liquid crystal screen of a PWM dimming mode and a DC dimming mode, improves the compatibility of the main board and also avoids the problem of wrong use of the main board in the BOM of the whole machine.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A dimming control circuit is characterized by comprising a main chip, a dimming selection module and a brightness adjusting module; the main chip is respectively connected with the dimming selection module and the brightness adjustment module; the main chip is used for outputting a dimming control signal to the dimming selection module and outputting a brightness adjusting signal to the brightness adjusting module; the dimming selection module is used for selecting the main chip to be in a first dimming mode or a second dimming mode according to the dimming control signal; the brightness adjusting module is used for outputting a corresponding dimming signal according to the brightness adjusting signal and adjusting the backlight brightness.
2. The dimming control circuit of claim 1, wherein the dimming selection module comprises a switching unit and a dimming selection unit; the switch unit is respectively connected with the main chip and the dimming selection unit; the switch unit is used for switching off when the dimming control signal is a first level signal, controlling the dimming selection unit to select a first dimming mode, or switching on when the dimming control signal is a second level signal, controlling the dimming selection unit to select a second dimming mode.
3. The dimming control circuit of claim 2, wherein the dimming selection module further comprises a protection unit, and the protection unit is respectively connected with the main chip and the switch unit; the protection unit is used for providing current-limiting protection for the switch unit.
4. The dimming control circuit of claim 3, wherein the dimming selection module further comprises a pull-down unit; the pull-down unit is respectively connected with the protection unit and the main chip; the pull-down unit is used for controlling the dimming control signal to be a first level signal.
5. The dimming control circuit of claim 2, wherein the switching unit comprises a switching tube, a first end of the switching tube is connected to the main chip, a second end of the switching tube is connected to the dimming selection unit, and a third end of the switching tube is grounded.
6. The dimming control circuit of claim 2, wherein the dimming selection unit comprises a first capacitor, one end of the first capacitor is connected to the output end of the brightness adjustment module, and the other end of the first capacitor is connected to the switch unit.
7. The dimming control circuit of claim 3, wherein the protection unit comprises a first resistor, one end of the first resistor is connected to the main chip, and the other end of the first resistor is connected to the switching unit.
8. The dimming control circuit of claim 4, wherein the pull-down unit comprises a second resistor, one end of the second resistor is connected to the main chip and the protection unit, and the other end of the second resistor is grounded.
9. The dimming control circuit of claim 1, wherein the brightness adjustment module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, and a triode; one end of the third resistor is connected with a first power supply end, the other end of the third resistor, one end of the fourth resistor and one end of the seventh resistor are all connected with the main chip, and the other end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor and the collector of the triode are all connected with a dimming signal output end and the dimming selection module; the other end of the seventh resistor and one end of the second capacitor are both connected with the base electrode of the triode, the other end of the second capacitor is grounded, and the emitting electrode of the triode is grounded; the other end of the fifth resistor is connected with a second power supply end, and the other end of the sixth resistor is connected with a third power supply end.
10. A display device, comprising a main board, a constant current board and a display screen connected in sequence, wherein the main board is provided with the dimming control circuit according to any one of claims 1 to 9.
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| CN108377595A (en) * | 2018-03-14 | 2018-08-07 | 合肥惠科金扬科技有限公司 | A kind of multifunctional integrated low-cost backlight circuit and display equipment |
| CN109215597A (en) * | 2018-10-12 | 2019-01-15 | 合肥惠科金扬科技有限公司 | A kind of display driver circuit and television set |
| CN110164366A (en) * | 2019-04-22 | 2019-08-23 | 联想(北京)有限公司 | A kind of information processing method, electronic equipment |
| CN211406377U (en) * | 2019-12-27 | 2020-09-01 | 武汉韦尔半导体有限公司 | Mixed dimming and duty ratio control circuit |
| CN111182680A (en) * | 2020-01-20 | 2020-05-19 | 深圳市创维群欣安防科技股份有限公司 | Button device and conference are dull and stereotyped |
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Application publication date: 20210223 |