CN213277411U - Timing adjustment device and display apparatus - Google Patents
Timing adjustment device and display apparatus Download PDFInfo
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- CN213277411U CN213277411U CN202022375182.4U CN202022375182U CN213277411U CN 213277411 U CN213277411 U CN 213277411U CN 202022375182 U CN202022375182 U CN 202022375182U CN 213277411 U CN213277411 U CN 213277411U
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Abstract
Disclosed are a timing adjusting device and a display apparatus, the timing adjusting device including: the microcontroller outputs an enable signal and a pulse width modulation signal to the backlight module and outputs a control signal; the visual angle switching signal generating unit is connected with the microcontroller, generates and outputs a visual angle switching signal; the backlight module comprises a switch unit, a control unit and a backlight module, wherein the switch unit receives a control signal and a visual angle switching signal and outputs a driving signal to a visual angle switching control panel according to the control of the control signal; at least one of the enabling signal and the pulse width modulation signal is disconnected from transmission, and the driving signal is a grounding signal. The microcontroller of the time sequence adjusting device outputs control signals to the switch unit according to the signals received by the backlight module, and controls the driving signals output by the switch unit, so that the backlight module and the visual angle switching control panel can simultaneously receive effective starting signals, synchronous opening or closing is realized, and the phenomenon of picture flicker is eliminated.
Description
Technical Field
The utility model relates to a liquid crystal display technology field, in particular to chronogenesis adjusting device and display device.
Background
The liquid crystal display has the advantages of low power consumption, small volume, light weight, ultra-thin screen and the like, so that the liquid crystal display is widely applied to electronic products, and the requirements on the performance and the image quality of the display are higher and higher.
Fig. 1a shows a schematic block diagram of a prior art display device; fig. 1b shows a waveform diagram of the timing adjustment device of the display apparatus according to fig. 1a at power-on. As shown in fig. 1a, the display device 100 includes a display panel 101, a backlight module 102 and a viewing angle switching control panel 103 connected to each other, and a printed circuit board 104 for providing signals to the display device, and a timing adjusting device 110 is located on the printed circuit board 104. The timing adjusting device 110 includes a microcontroller 120 (MCU), a common voltage adjusting Unit 131, and an operational amplifier 141 (OP). The microcontroller 120 provides the enable signal EN and the PWM signal PWM to the backlight module 102 according to an externally input enable control signal EN1 and the PWM control signal PWM1, and also provides a viewing angle switching signal FB03 to the viewing angle switching control panel 103 through the common voltage regulator 131 and the operational amplifier 141, the backlight module 102 further receives the power signal VIN, and the backlight module 102 and the viewing angle switching control panel 103 operate according to the received signals to control the display panel 101 to display images.
At present, the backlight module 102 and the viewing angle switching control panel 103 may receive different signals at different receiving times, that is, the backlight module 102 and the viewing angle switching control panel 103 are not synchronized in on and off states, which may cause a screen flickering problem. As shown in fig. 1b, the power-on timings of the power signal VIN, the enable signal EN, the PWM signal PWM and the viewing angle switching signal FB03 are respectively shown, and it can be seen from the figure that the signal start timings are VIN, FB03, PWM and EN, respectively, so that the backlight module 102 and the viewing angle switching control panel 103 are not synchronized when powering on, and the viewing angle switching signal FB03 has a certain glitch, which may cause a flickering phenomenon with different degrees due to different ambient light intensities at the moment of powering on.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide a sequential control device and display device controls visual angle switching control panel received drive signal through a control signal of microcontroller output for backlight unit and visual angle switching control panel can synchronous receipt effective visual angle switching signal, guarantee the time sequence nature of signal, reduce the production of splash screen phenomenon, with the problem of solving among the prior art.
According to the utility model discloses an aspect provides a chronogenesis adjusting device, include:
the microcontroller outputs an enable signal and a pulse width modulation signal to the backlight module and outputs a control signal;
the visual angle switching signal generating unit is connected with the microcontroller, generates and outputs a visual angle switching signal; and
a switch unit connected with the microcontroller and the visual angle switching signal generating unit, receiving the control signal and the visual angle switching signal, outputting a driving signal to a visual angle switching control panel according to the control of the control signal,
the backlight module receives the enabling signal and the pulse width modulation signal, and the driving signal is the visual angle switching signal;
at least one of the enabling signal and the pulse width modulation signal is disconnected from transmission, and the driving signal is a grounding signal.
Optionally, the microcontroller is connected to the backlight module and the switch unit, and the microcontroller outputs the enable signal and the pwm signal to the backlight module at the same time and outputs the high-level control signal to the switch unit;
the microcontroller disconnects transmission of at least one of the enable signal and the pulse width modulation signal output by the backlight module and outputs the control signal of low level to the switch unit.
Optionally, the switch unit is connected to the viewing angle switching control panel, and the switch unit outputs a viewing angle switching signal to the viewing angle switching control panel to control the backlight module and the viewing angle switching control panel to work synchronously;
and the switch unit outputs a grounding signal to the visual angle switching control panel to control the backlight module and the visual angle switching control panel to be synchronously closed.
Optionally, the microcontroller outputs the control signal of high level to the switch unit, the driving signal output by the switch unit is the viewing angle switching control signal,
the microcontroller outputs the control signal with low level to the switch unit, and the driving signal output by the switch unit is a grounding signal.
Optionally, the switch unit includes an analog switch, and the analog switch switches the driving signal between the viewing angle switching signal and the ground signal according to control of the control signal.
Optionally, the analog switch comprises a transistor, and the control signal controls the transistor to be turned on and off.
Optionally, the viewing angle switching signal generating unit includes:
the common voltage regulator is connected with the microcontroller, receives the intermediate signal output by the microcontroller and outputs a first intermediate visual angle switching signal through the first operational amplifier;
the power chip is connected with the common voltage regulator and outputs a second intermediate visual angle switching signal through a second operational amplifier; and
and the third operational amplifier is connected with the common voltage regulator, the power chip and the switch unit and is used for generating the view switching signal from the received first intermediate view switching signal and the received second intermediate view switching signal.
According to the utility model discloses the second aspect provides a display device, including backlight unit and visual angle switching control panel, still include: the display panel is connected with the backlight module and the visual angle switching control panel; and
the above time sequence adjusting device is connected to the backlight module and the viewing angle switching control panel.
Optionally, the display device further comprises: a printed circuit board on which the timing adjustment device is located.
Optionally, the timing adjusting device receives an enable control signal and a pulse width adjusting control signal input from the outside, and outputs the enable signal and the pulse width adjusting signal to the backlight module.
The utility model provides a chronogenesis adjusting device and display device, including microcontroller and switch unit, microcontroller is according to backlight unit received signal to switch unit output control signal, the output of control switch unit, make backlight unit when receiving effective visual angle switching signal, visual angle switching control panel also can receive effective visual angle switching signal, and backlight unit is when closing, visual angle switching control panel also can be closed in step, reach backlight unit and visual angle switching control panel and open and turn-off's purpose in step, reduce the risk of picture scintillation.
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The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1a shows a schematic block diagram of a prior art display device;
FIG. 1b shows a waveform diagram of a timing adjustment device of the display apparatus according to FIG. 1a at power-on;
fig. 2 shows a schematic block diagram of a timing adjustment device according to an embodiment of the present invention.
Fig. 3 shows a schematic block diagram of a display device according to an embodiment of the present invention.
Fig. 4a and 4b show waveform diagrams of the timing adjusting device according to the embodiment of the present invention at the time of power on and power off, respectively.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to". The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 2 shows a schematic block diagram of a timing adjustment device according to an embodiment of the present invention.
Referring to fig. 1a, when the conventional display device is operated by a user, the flicker phenomenon with different degrees is caused by different ambient light brightness at the moment of starting up, mainly caused by the asynchronous work of the backlight module 102 and the view switching control panel 103, for example, the time sequence of starting up the actual measurement system is: vin → FB03 → PWM → EN, and the timing of shutdown is: EN → FB03& Vin → PWM, the viewing angle switching signal FB03 is an effective viewing angle switching signal received by the viewing angle switching control panel 103, and the enable signal EN and the pulse width modulation signal PWM are effective viewing angle switching signals received by the backlight module 102, so according to the above timing sequence, the viewing angle switching control panel 103 is started before the backlight module 102 is started when the display device is started, and the backlight module 102 is closed before the viewing angle switching control panel 103 is closed when the display device is stopped, so that the display device can see an obvious splash screen phenomenon when the display device is started and stopped at the timing sequence; in addition, when the view switching signal FB03 is turned on or off, the waveform has abnormal peaks or glitches, which may cause a screen flicker to some extent.
The utility model discloses improve it, provide a sequential control device, control backlight unit and visual angle switch control panel can lead to and not receive effective visual angle switching signal to reduce and flash the screen phenomenon.
As shown in fig. 2, the timing adjustment device 210 of the embodiment includes: a microcontroller 220, a viewing angle switching signal generating unit 230 (an EQ panel), and a switching unit 250. The microcontroller 220 outputs an enable signal EN and a pulse width modulation signal PWM to the backlight module 202, and outputs a control signal IN; the viewing angle switching signal generating unit 230 is connected to the microcontroller 210, receives the intermediate signal S1 output by the microcontroller 210, generates and outputs a viewing angle switching signal FB03, and is used for controlling the viewing angle of the display panel; the switch unit 250 is connected to the microcontroller 220 and the viewing angle switching signal generating unit 230, receives the control signal IN and the viewing angle switching signal FB03, outputs a driving signal FB03_ O to the viewing angle switching control panel 203 according to the control of the control signal IN, and outputs a driving signal FB03_ O to be received by the viewing angle switching control panel 203 to control the operation of the viewing angle switching control panel 203. In addition, the microcontroller 220 receives an enable control signal EN1 and a pulse width modulation signal PWM1, which are externally input, such as a client input device, and outputs the enable signal EN and the pulse width modulation signal PWM to the backlight module 202 according to the two signals.
When the backlight module 202 receives the enable signal EN and the PWM signal PWM (here, the backlight module 202 receives both the enable signal EN and the PWM signal PWM), the control signal IN output by the microcontroller 220 is at a high level, and the driving signal FB03_ O output by the switch unit 250 is the viewing angle switching signal FB 03; when at least one of the enable signal EN and the pulse width modulation signal PWM is turned off (i.e. the enable signal EN received by the backlight module 202 is 0, or the received pulse width modulation signal PWM is 0, or both the enable signal EN and the pulse width modulation signal PWM are 0), the control signal IN output by the microcontroller 220 is at a low level, and the driving signal FB03_ O output by the switch unit 250 is the ground signal GND.
Further, IN the on state, the enable signal EN and the PWM signal PWM are both received by the backlight module 202, the control signal IN is at a high level, the driving signal FB03_ O is the viewing angle switching signal FB03, otherwise the driving signal FB03_ O is the ground signal GND. That is, in the on state, when the backlight module 202 receives the effective viewing angle switching signal (the enable signal EN and the PWM signal PWM), the viewing angle switching control panel 203 also receives the effective viewing angle switching signal (the viewing angle switching signal FB03), and the two are turned on synchronously.
IN the power-off state, at least one of the enable signal EN and the PWM signal PWM is turned off, the control signal IN is at a low level, the driving signal FB03_ O is the ground signal GND, otherwise, the driving signal FB03_ O is the view switching signal FB 03. That is, in the power-off state, when at least one of the effective viewing angle switching signals of the backlight module 202 is at a low level, the driving signal received by the viewing angle switching control panel 203 is also at a low level, so that the viewing angle switching control panel 203 stops working while the backlight module 202 stops working, and the two are turned off synchronously.
Therefore, the timing adjustment device 210 provided IN this embodiment can output the control signal IN according to the signal status received by the backlight module 202, and control the operation of the viewing angle switching control panel 203 according to the control signal IN, specifically, when the control signal IN is at a high level, the backlight module 202 and the viewing angle switching control panel 203 are controlled to operate synchronously; when the control signal IN is at a low level, the backlight module 202 and the viewing angle switching control panel 203 are controlled to be turned off synchronously, so as to avoid the image flicker phenomenon caused by the asynchronous switching of the backlight module 202 and the viewing angle switching control panel 203.
Fig. 3 shows a schematic block diagram of a display device according to an embodiment of the present invention.
As shown in fig. 3, the present invention further provides a display device, the display device 200 includes a display panel 201, a backlight module 202, a viewing angle switching control panel 203 and a printed circuit board (not shown in the figure), and the timing adjusting device 210 shown in fig. 2 is located on the printed circuit board. The display panel 201 is connected to the backlight module 202 and the viewing angle switching control panel 203, and the timing adjusting device 210 is also connected to the backlight module 202 and the viewing angle switching control panel 203. The backlight module 202 provides backlight to the display panel, and the viewing angle switching control panel 203 is another panel attached to the display panel 201 and is used for controlling the switching of the viewing angle of the display panel 201.
The backlight module 202 receives the power signal VIN, the enable signal EN and the PWM signal PWM outputted from the timing adjusting device 210, and the viewing angle switching control panel 203 receives the driving signal FB03_ O outputted from the timing adjusting device 210.
IN conjunction with fig. 2 and 3, the switching unit 250 includes an analog switch that switches the driving signal FB03_ O between the viewing angle switching signal FB03 and the ground signal GND according to the control of the control signal IN. The analog switch mainly completes the signal switching function in the signal link, and the switching-off or switching-on of the signal link is realized by adopting the switching mode of the MOS tube; because its function is similar to a switch, but is realized by the characteristics of an analog device, the switch becomes an analog switch. Therefore, the analog switch 250 of the present embodiment includes a transistor, and the control signal IN controls the transistor to be turned on and off, thereby controlling the link to be turned on or off.
The viewing angle switching signal generating unit 230 includes: a common voltage regulator 231, a first operational amplifier 232, a power chip 233, a second operational amplifier 234, and a third operational amplifier 241. The common voltage regulator 231 is connected to the microcontroller 220, receives the intermediate signal S1 output by the microcontroller 220, and outputs a first intermediate viewing angle switching signal FB01 via the first operational amplifier 232; the power chip 233 is connected to the common voltage regulator 231, and outputs a second intermediate view switching signal FB02 via the second operational amplifier 234; the third operational amplifier 241 is connected to the common voltage regulator 231, the power chip 233 and the switch unit 250, and is configured to generate the view switching signal FB03 from the received first intermediate view switching signal FB01 and second intermediate view switching signal FB 02. The viewing angle switching signal FB03 output by the viewing angle switching signal generating unit 230 is connected to the NC terminal of the analog switch, the ground signal GND input from the outside is connected to the NO terminal of the analog switch, the control signal IN output by the microcontroller 220 is connected to the control terminal of the analog switch, the output terminal COM terminal of the analog switch is connected to the viewing angle switching control panel 203, and the driving signal FB03_ O is output to the viewing angle switching control panel 203.
The operation principle of the display device and the timing adjustment device of the present embodiment is the same as that described in fig. 2, and will not be described in detail. According to the timing adjusting device of the embodiment, when the backlight module is turned on, the microcontroller 220 receives an external enable control signal EN1 and a pulse width modulation signal PWM1, outputs the enable signal EN and the pulse width modulation signal PWM to the backlight module 202, the backlight module 202 further receives a power signal VIN, at this time, the microcontroller 220 outputs a high-level control signal IN to the analog switch, the analog switch controls the driving signal FB03_ O to be switched to the viewing angle switching signal FB03 according to the control signal IN, and the backlight module 202 and the viewing angle switching control panel 203 are synchronously turned on; similarly, in the power-off state, the backlight module 202 and the viewing angle switching control panel 203 are turned off synchronously. According to the control signal outputted by the microcontroller 220, the backlight module 202 and the viewing angle switching control panel 203 work synchronously, and the image flicker is reduced.
Fig. 4a and 4b show waveform diagrams of the timing adjusting device according to the embodiment of the present invention at the time of power on and power off, respectively.
As shown IN fig. 4a and 4b, waveform diagrams of signals at the time of turning on and off are obtained according to the timing adjusting device 100, where fig. 4a and 4b are both a waveform obtained from an oscilloscope, the abscissa represents time, and the ordinate represents voltage, and mainly show waveform diagrams of the power supply signal VIN, the control signal IN, the driving signal FB03_ O, and the view switching signal FB 03.
As shown IN fig. 4a, IN the power-on state, the power signal VIN is first powered up to a high level, then the microcontroller 220 outputs an effective viewing angle switching signal to the backlight module 202, the control signal IN is switched from a low level to a high level, and during a period when the control signal IN is at the low level, the viewing angle switching signal FB03 is output, but the driving signal FB03_ O is always kept at the ground signal GND. When the control signal IN changes to high level, the driving signal FB03_ O follows the visual angle switching signal FB03, and the backlight module and the visual angle switching control panel are simultaneously activated. As can be seen from fig. 4a, the driving signal FB03_ O remains at the ground signal GND regardless of the change of the viewing angle switching signal FB03 until the control signal IN becomes high level, so the viewing angle switching control panel is not affected. Therefore, the driving signal FB03 can not affect the display image at the glitch or peak just after the power-on, and the backlight module and the viewing angle switching control panel are synchronously activated after the control signal IN is changed to high level.
As shown IN fig. 4b, IN the off state, the effective viewing angle switching signal of the backlight module is first changed to low level, so that the control signal IN is changed from high level to low level, the driving signal FB03_ O always follows the viewing angle switching signal FB03 before the control signal IN is changed to low level, and when the control signal IN is changed to low level, the driving signal FB03_ O immediately changes to the ground signal GND and changes to low level. After that, the power supply signal VIN becomes low level. Therefore, when the backlight module stops working, the visual angle switching control panel stops working immediately, and no matter how many burrs or peaks exist behind the visual angle switching signal FB03, the display picture cannot be influenced, so that the backlight module and the visual angle switching control panel are synchronously closed.
To sum up, according to the utility model discloses a chronogenesis adjusting device and display device are through backlight unit received signal for microcontroller output control signal, control visual angle switch control panel received drive signal switches between visual angle switch signal and ground signal, thereby realizes backlight unit and visual angle switch control panel's synchronous working and close, reduces the risk of picture scintillation.
Finally, it should be noted that: in accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its practical application in conjunction with the modifications made to the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A timing adjustment device, comprising:
the microcontroller outputs an enable signal and a pulse width modulation signal to the backlight module and outputs a control signal;
the visual angle switching signal generating unit is connected with the microcontroller, generates and outputs a visual angle switching signal; and
a switch unit connected with the visual angle switching signal generating unit, receiving the control signal and the visual angle switching signal, outputting a driving signal to a visual angle switching control panel according to the control of the control signal,
the backlight module receives the enabling signal and the pulse width modulation signal, and the driving signal is the visual angle switching signal;
at least one of the enabling signal and the pulse width modulation signal is disconnected from transmission, and the driving signal is a grounding signal.
2. The timing adjustment device of claim 1,
the microcontroller is connected with the backlight module and the switch unit, and simultaneously outputs the enable signal and the pulse width modulation signal to the backlight module and outputs the control signal with high level to the switch unit;
the microcontroller disconnects transmission of at least one of the enable signal and the pulse width modulation signal output by the backlight module, and outputs the control signal of low level to the switch unit.
3. The timing adjustment device of claim 2,
the switch unit is connected with the visual angle switching control panel, outputs a visual angle switching signal to the visual angle switching control panel and controls the backlight module and the visual angle switching control panel to work synchronously;
and the switch unit outputs a grounding signal to the visual angle switching control panel to control the backlight module and the visual angle switching control panel to be synchronously closed.
4. The timing adjustment device of claim 3,
the microcontroller outputs the control signal with high level to the switch unit, the driving signal output by the switch unit is the visual angle switching control signal,
the microcontroller outputs the control signal with low level to the switch unit, and the driving signal output by the switch unit is a grounding signal.
5. The timing adjustment device of claim 1,
the switching unit includes an analog switch that switches the driving signal between the viewing angle switching signal and the ground signal according to control of the control signal.
6. The timing adjustment device of claim 5, wherein the analog switch comprises a transistor, and wherein the control signal controls the transistor to turn on and off.
7. The timing adjustment device according to claim 1, wherein the view switching signal generating unit comprises:
the common voltage regulator is connected with the microcontroller, receives the intermediate signal output by the microcontroller and outputs a first intermediate visual angle switching signal through the first operational amplifier;
the power chip is connected with the common voltage regulator and outputs a second intermediate visual angle switching signal through a second operational amplifier; and
and the third operational amplifier is connected with the common voltage regulator, the power chip and the switch unit and is used for generating the view switching signal from the received first intermediate view switching signal and the received second intermediate view switching signal.
8. The utility model provides a display device, includes backlight unit and visual angle switching control panel, its characterized in that still includes:
the display panel is connected with the backlight module and the visual angle switching control panel; and
the timing adjustment device according to any one of claims 1 to 7, connected to the backlight module and the viewing angle switching control panel.
9. The display device according to claim 8, further comprising: a printed circuit board on which the timing adjustment device is located.
10. The display device according to claim 9, wherein the timing adjusting device receives an enable control signal and a pulse width adjusting control signal input from outside, and outputs the enable signal and the pulse width adjusting signal to the backlight module.
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| CN202022375182.4U CN213277411U (en) | 2020-10-22 | 2020-10-22 | Timing adjustment device and display apparatus |
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| CN202022375182.4U CN213277411U (en) | 2020-10-22 | 2020-10-22 | Timing adjustment device and display apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113327559A (en) * | 2021-06-08 | 2021-08-31 | 昆山龙腾光电股份有限公司 | Control system, control method and display device |
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| CN113327559A (en) * | 2021-06-08 | 2021-08-31 | 昆山龙腾光电股份有限公司 | Control system, control method and display device |
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