CN110867169B - Display device and display driving method - Google Patents
Display device and display driving method Download PDFInfo
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- CN110867169B CN110867169B CN201911032334.6A CN201911032334A CN110867169B CN 110867169 B CN110867169 B CN 110867169B CN 201911032334 A CN201911032334 A CN 201911032334A CN 110867169 B CN110867169 B CN 110867169B
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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
- G09G2320/02—Improving the quality of display appearance
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
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Abstract
The invention discloses a display device, comprising: a display panel for displaying image data according to the data signal; the time sequence controller is used for providing a time sequence control signal for the display panel; a power line disposed at a periphery of the display panel; and the time sequence controller is connected with the detection circuit and is used for switching codes when the mobile phone interference exists so as to switch the time sequence control signal. The invention also discloses a display driving method. Whether mobile phone interference exists or not can be automatically detected by the display panel, and data code switching is carried out in advance after the mobile phone interference is detected, so that the display panel is prevented from entering an unlocked state, and the risk of flashing of the display panel is reduced.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a display device and a display driving method.
Background
The liquid crystal display has many advantages of thin body, power saving, no radiation, etc., and is widely used. Most of the liquid crystal displays on the market are backlight type liquid crystal displays. The conventional lcd may use a Light Emitting Diode (LED) as a backlight source, and mainly includes an edge Light type and a direct type.
The liquid crystal display includes: a plurality of source driver Integrated Circuits (ICs) for supplying data voltages to data lines of the liquid crystal display panel; a plurality of gate driver ICs for sequentially supplying gate driving pulses (or scanning pulses) to scanning lines of the liquid crystal display panel; and a timing controller for controlling the source driver IC, the gate driver IC, and the like.
The timing controller supplies digital video data, a clock for sampling the digital video data, a control signal for controlling the operation of the source driver ICs, and the like to the source driver ICs through an interface, for example, a mini Low Voltage Differential Signaling (LVDS) interface. The source driver ICs convert digital video data received from the timing controller into analog data voltages and supply the analog data voltages to the data lines.
The existing performance test of the display panel has the problem of electromagnetic interference such as mobile phone interference, for example, a voice signal generated during a call of a mobile phone interferes with a source driver IC in the display panel and a connection wire between the source driver IC and a timing controller, for example, a point-to-point (P2P) wire, which causes abnormal pictures. The conventional solution is to generate an unlock signal with a low voltage when the source driver IC is abnormally operated (e.g., disturbed), so that the display panel enters an unlock state. The time schedule controller receives the unlock signal, thereby switching the data codes.
Fig. 1 is a flowchart illustrating a method for solving an anomaly of a source driver chip in the prior art, and referring to fig. 1, the following operations are generally performed when a mobile phone interference test is performed in the prior art:
powering on the system, transmitting a clock training analog signal to the source driver by the timing controller, and performing a clock training operation while outputting and recovering an internal clock by a clock recovery circuit of the source driver based on a clock training mode signal; when the phase and frequency of the internal clock are stably locked, a data link to which video data of an input image is transferred is formed between the source driver and the timing controller. When the mobile phone interference is detected, a low-level LOCK signal, i.e. LOCK ═ L, is output, and the timing controller starts to perform code switching in response to the LOCK signal received from the source driver, for example: the amplitude of the eye diagram is increased, the common voltage VCM in the circuit is adjusted, the SSC interface of the main control chip is closed, the parameters of the equalizer EQ are modified, and the like, so that the source driver can receive video/image data output by the time sequence controller, and the mobile phone interference is improved. And restoring the modification of various codes after a certain time.
Through many tests, the phenomenon of flashing lines appears on the display when an unlock signal (namely, the LOCK signal LOCK is equal to L) appears in the prior art, and certain display quality is abnormal, so that the customer experience is influenced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a display device and a display driving method, which can automatically detect whether there is a mobile phone interference by a display panel, and perform data code switching in advance after detecting the mobile phone interference, so as to prevent the display panel from entering an unlocked state, and reduce the risk of a flash line on the display panel.
According to the present invention, there is provided a display device comprising: a display panel for displaying image data according to the data signal; the time sequence controller is used for providing a time sequence control signal for the display panel; a power line disposed at a periphery of the display panel; and the time sequence controller is connected with the detection circuit and is used for switching codes when the mobile phone interference exists so as to switch the time sequence control signal.
Preferably, the detection circuit includes: the comparator is used for receiving the threshold voltage at a non-inverting input end, receiving the reference voltage signal at an inverting input end and generating a corresponding detection signal according to the jump of the reference voltage signal; the input end of the processor is connected with the output end of the comparator and is used for receiving and judging whether the detection signal is a stable high-level signal with a certain frequency interval or not and outputting a corresponding control signal according to a judgment result;
preferably, the voltage value of the threshold voltage is smaller than the voltage value of the reference voltage signal which is not hopped and larger than the voltage value of the reference voltage signal after hopping.
Preferably, the processor comprises: a counting unit for counting a high level component of the detection signal; the calculating unit is connected with the counting unit, receives a counting value and calculates the frequency of the high-level component of the detection signal within a certain time; and the comparison unit is connected with the calculation unit and used for comparing whether the frequency of the detection signal is the same as the reference frequency or not and outputting a first control signal when the frequency is the same.
Preferably, the reference frequency is a frequency of a voice signal during a phone call.
Preferably, the code switching comprises: and increasing the amplitude of the eye pattern, adjusting the common voltage, closing a corresponding interface of the main control chip, and modifying corresponding parameters of the equalizer.
Preferably, the display device further includes: a source driver connected to the timing controller and the display panel, for supplying a data voltage to the display panel according to the timing control signal; and a gate driver connected to the timing controller and the display panel, for sequentially supplying scan pulses to the display panel according to the timing control signal.
Preferably, the detection circuit includes: the comparator is used for receiving the threshold voltage at the non-inverting input end and generating a corresponding detection signal according to the voltage on the power line at the inverting input end; the input end of the processor is connected with the output end of the comparator and is used for receiving and judging whether the detection signal is a stable high-level signal with a certain frequency interval or not and outputting a corresponding control signal according to a judgment result;
preferably, the voltage value of the threshold voltage is smaller than that of the non-jump reference voltage.
Preferably, the processor comprises: a counting unit for counting a high level component of the detection signal; the calculating unit is connected with the counting unit, receives a counting value and calculates the frequency of the high-level component of the detection signal within a certain time; and the comparison unit is connected with the calculation unit and used for comparing whether the frequency of the detection signal is the same as the reference frequency or not and outputting a first control signal when the frequency is the same.
Preferably, the reference frequency is a frequency of a voice signal during a phone call.
Preferably, the code switching comprises: and increasing the amplitude of the eye pattern, adjusting the common voltage, closing a corresponding interface of the main control chip, and modifying corresponding parameters of the equalizer.
Preferably, the display device further includes: a source driver connected to the timing controller and the display panel, for supplying a data voltage to the display panel; and a gate driver connected to the timing controller and the display panel, for sequentially supplying scan pulses to the display panel.
According to the present invention, there is provided a display driving method comprising: powering on the system; receiving an interference signal to generate a reference voltage signal transition; judging whether mobile phone interference exists according to the jump of the reference voltage signal; generating a first control signal when the mobile phone interference exists, and switching codes according to the first control signal; the code is initialized after a duration of time.
Preferably, the method for determining whether there is interference of the mobile phone includes: setting a threshold voltage, comparing the threshold voltage with the reference voltage signal and outputting a detection signal; calculating the frequency of the detection signal; and comparing whether the frequency of the detection signal is the same as the frequency of the voice signal during the call of the mobile phone, and if so, judging that the mobile phone interference exists.
Preferably, the code switching comprises: and increasing the amplitude of the eye pattern, adjusting the common voltage, closing a corresponding interface of the main control chip, and modifying corresponding parameters of the equalizer.
The invention has the beneficial effects that: the power line is arranged on the periphery of the display panel and can be used as a detection wiring, whether mobile phone interference exists or not is detected through jumping of a reference voltage signal generated when the display panel has the interference, and the time schedule controller is controlled to switch codes in advance when the mobile phone interference is judged, so that the display panel does not enter an unlocked state, the display signal is stabilized, and the risk of flash lines of the display panel is reduced.
The invention can also be applied to any driving chip without a detection function, so that the display panel can have the detection function of the mobile phone interference.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
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. 1 is a flow chart illustrating a method for solving the abnormality of a source driver chip in the prior art;
FIG. 2 is a schematic view showing a structure of a display device;
FIG. 3 is a schematic diagram of a source driver in the display device of FIG. 2;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating cell phone interference in an embodiment of the present invention;
FIG. 6 is a waveform diagram of the PCB ground terminal after the display panel has the cell phone interference according to the embodiment of the present invention;
FIG. 7(a) is a signal waveform diagram showing the inverting input of the comparator of FIG. 4;
FIG. 7(b) shows a signal waveform diagram of the output terminal of the comparator in FIG. 4;
fig. 8 is a flowchart illustrating a display driving method according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a method for solving an abnormality of a source driver chip according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 illustrates a schematic configuration of a display device, and fig. 3 illustrates a schematic configuration of a source driver in the display device of fig. 2. as shown in fig. 2& 3, the display device includes a display panel PNL, a timing controller TCON, one or more source driver Integrated Circuits (ICs) SIC _1 to SIC _4, and a gate driver (IC) GIC.
The display panel PNL includes data lines DL, scan lines GL, and liquid crystal cells arranged in a matrix form based on a crossing structure of the data lines DL and the scan lines GL. The liquid crystal cells include a thin film transistor, a storage capacitor, and the like, and each liquid crystal cell is driven by an electric field between a pixel electrode to which a data voltage is supplied through the thin film transistor and a common electrode to which a common voltage is supplied.
The gate electrode of the thin film transistor is connected to the scan line GL, and the drain electrode is connected to the data line DL. The source of the thin film transistor is connected to the pixel electrode of the liquid crystal cell, turned on in response to a gate driving pulse supplied through the scan line GL and supplies a data voltage from the data line DL to the pixel electrode of the liquid crystal cell.
The signal line pairs 101 are respectively connected between the timing controller TCON and the source drivers SIC _1 to SIC _4, for transmitting differential signal pairs of EPIC data to the source drivers SIC _1 to SIC _ 4. The LOCK line 102 is connected between the timing controller TCON and one source driver SIC _4 for transmitting the LOCK signal LOCK to the timing controller TCON.
The timing controller TCON receives external timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an external data enable signal DE, and a main clock CLK from an external host system through, for example, a Low Voltage Differential Signaling (LVDS) interface and a Transition Minimized Differential Signaling (TMDS) interface. The timing controller TCON may convert the clock training mode signal CT, the control data CTR, and the pixel data RGB into a differential signal pair of low voltage based on an Embedded Panel Interface (EPI) protocol and transmit them to the source drivers SIC _1 to SIC _4 through the signal line pair 101. The clock training pattern signal CT, the control data CTR, and the pixel data RGB each include an EPI clock.
Each of the clock recovery circuits of the source drivers SIC _1 to SIC _4 generates a LOCK signal LOCK of a high logic level indicating a LOCK state when the phase and frequency of the internal clock recovered from the received EPI clock are locked. On the other hand, when the phase and frequency of the internal clock recovered from the received EPI clock are not locked, each of the clock recovery circuits of the source drivers SIC _1 to SIC _4 generates a LOCK signal LOCK of a low logic level indicating an unlocked state. The LOCK signal LOCK is transmitted to the next source driver. The last source driver SIC _ M transmits the LOCK signal LOCK to the timing controller TCON through the LOCK line 102. The power supply voltage VCC is input to the lock signal input terminal of the first source driver SIC _ 1.
When the LOCK signal LOCK is at a low logic level, the timing controller TCON transmits the clock training mode signal CT to the source drivers SIC _1 to SIC _ 4. When the level of the LOCK signal LOCK is converted to the high logic level, the timing controller TCON starts to transmit the pixel data RGB and the control data CTR of the input image to the source drivers SIC _1 to SIC _ 4.
The source drivers SIC _1 to SIC _4 decode the control data CTR input through the signal line pair 101 in a code mapping method and restore source control data and gate control data. The source drivers SIC _1 to SIC _4 convert video data of an input image into a positive analog video data voltage and a negative analog video data voltage in response to the restored source control data and supply the data voltages to the data lines DL of the display panel PNL. The source drivers SIC _1 to SIC _4 may transmit gate control data to at least one of the gate drivers GIC.
The gate driver GIC sequentially supplies gate driving pulses synchronized with the positive and negative analog video data voltages to the scan lines GL of the display panel PNL in response to the gate control data.
As shown in fig. 3, each source driver includes an equalizer 10, a decoder 11, a digital-to-analog converter 12, and an output circuit 13, which are connected in this order. The equalizer 10 may amplify an output of the receiving terminal Rx of the source driver according to an Equalization (EQ) setting value. The decoder 11 restores an EPI clock received from the timing controller TCON using the DLL, generates internal clocks, samples received data bits at the timing of each internal clock, and samples received control data based on the internal clocks and restores source control data (including the output enable signal SOE, the make control signal POL, and the like). The digital-to-analog converter 12 converts the video data received from the decoder 11 into a positive gamma compensation voltage GH and a negative gamma compensation voltage GL, and generates a positive analog data voltage and a negative analog data voltage; the digital-to-analog converter 12 inverts the polarity of the data voltage in response to the polarity control signal POL. The output circuit 13 is used to supply positive/negative data voltages or positive/negative analog voltages to the data lines D1 to Dk through a charge sharing or output buffer. Wherein k is a positive integer.
The output circuit 13 supplies an average voltage of the positive and negative data voltages or a half VDD voltage to the data lines D1 to Dk through charge sharing when the output enable signal SOE is at a logic high level. The output circuit 13 supplies the positive and negative analog voltages to the data lines D1 to Dk through the output buffer when the output enable signal SOE is at a logic low level.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the invention, and as shown in fig. 4, the display device includes a display panel 100, a power line 103, a detection circuit 200, and a timing controller 300.
The display panel 100 is used for displaying image data according to a data signal. Which may be implemented as a liquid crystal display panel (LCD), a field emission display panel (FED), a Plasma Display Panel (PDP), an organic light emitting display panel, and the like.
The display panel 100 is provided with a Flexible Printed Circuit (FPC) and metal traces (WOA).
The power line 103 enters the display panel 100 through the Flexible Printed Circuit (FPC) and the metal wire WOA and is arranged on the periphery of the display panel 100, and the power line 103 is used for generating voltage jump when detecting the interference of the mobile phone.
Preferably, a reference voltage signal (e.g., 1.8V) is provided on the power line 103.
Fig. 5 shows a schematic diagram of the mobile phone interference in the embodiment of the present invention, fig. 6 shows a waveform diagram of the PCB ground terminal after the mobile phone interference exists on the display panel in the embodiment of the present invention, and referring to fig. 5 and fig. 6, the mobile phone is in a 2G communication state during a call, that is, the mobile phone may use the GSM frequency band to load signals. The GSM band has strong signals, but the electromagnetic radiation around the mobile phone is also large during the call. When testing the mobile phone interference, the principle is explained by taking the mobile phone communication frequency bands as GSM850 and GSM900 as examples:
when the mobile phone is in a call, that is, when there is mobile phone interference on the display panel, the phone voice will be transmitted in the form of a full-rate voice block after one path of call coding, in this embodiment, each voice block has a time length of 20ms, and each voice block contains 456 bits of voice message. Taking a voice block 5 as an example, after performing voice decoding on the voice block after channel coding by using an inter-block interleaving technique, a Time Division Multiple Access (TDMA) signal appears, that is, information at every 217Hz contains signals of 850MHz/900 MHz.
When the mobile phone in the call state is close to the exposed PCB of the display panel, the GSM frequency band signal contained in the call signal is transmitted to the PCB. It was measured that interference of 1V in amplitude intensity at intervals of 217Hz as shown in fig. 6 occurs on the ground GND of the PCB board.
In this embodiment, when the anti-interference capability of the mobile phone is tested, the anti-interference capability generally starts from the edge position of the display panel 100, and sequentially passes through the edge driving chips located on the display panel 100 according to a certain direction (e.g., a folding line). Therefore, the power lines 103 are disposed around the display panel 100, and since the power lines 103 do not have a certain anti-interference capability with respect to the source driver chips on the display panel 100, the power lines 103 can serve as detection traces, and a detection signal is generated by a voltage jump on the power lines 103 caused by the interference of the mobile phone.
The detection circuit 200 includes a comparator 210 and a processor 220. The detection circuit 200 is connected to the power line 103 to obtain a reference voltage signal on the power line 103, and is configured to determine whether there is a cell phone interference according to a jump of the reference voltage signal on the power line 103, and generate a first control signal when it is determined that there is the cell phone interference.
The non-inverting input terminal of the comparator 210 receives the threshold voltage, the inverting input terminal thereof is connected to the power line 103 to receive the reference voltage signal, and the comparator 210 is configured to generate the corresponding detection signal according to a transition of the reference voltage signal on the power line 103.
In this embodiment, the non-inverting input terminal of the comparator 210 is connected to the voltage of 1.5V on the display panel 100 as the threshold voltage, the inverting input terminal thereof is connected to the power line 103 to receive the reference voltage signal on the power line 103, and the power supply terminal of the comparator 210 is connected to the high level voltage (e.g., 3.3V). The threshold voltage of the non-inverting input terminal of the comparator 210 can be compared with the reference voltage of the inverting input terminal. In a normal state, the voltage value of the threshold voltage at the non-inverting input terminal of the comparator 210 is smaller than the voltage value of the reference voltage signal which is not jumped on the power line 103, and the comparator 210 outputs a low-level detection signal; when the power line 103 is interfered by the mobile phone, the voltage value of the reference voltage signal jumps to be smaller than the voltage value of the threshold voltage, and the comparator 210 outputs a high-level detection signal.
Fig. 7(a) shows a waveform diagram of a signal on the power line after the display panel is interfered in fig. 4, fig. 7(b) shows a waveform diagram of a signal on the output terminal of the comparator with interference in fig. 4, as shown in fig. 7(a), when there is cell phone interference in the display panel 100, a jump occurs in the reference voltage signal on the power line 103, and when the voltage value of the reference voltage signal on the power line 103 is lower than the threshold voltage input by the non-inverting input terminal of the comparator 210, the comparator 210 outputs a high-level detection signal, as shown in fig. 7(b), and when the detection signal output by the comparator 210 is a high-level signal with stable interval, such as 217HZ, it can be determined that cell phone interference exists.
The input terminal of the MCU is connected to the output terminal of the comparator 210, and is configured to receive the detection signal output by the comparator 210, and determine whether the detection signal is a stable high level signal with a certain frequency, such as 217HZ, to output a corresponding control signal according to the determination result.
In this embodiment, the processor MCU includes a counting unit 221, a calculating unit 222, and a comparing unit 223.
The counting unit 221 is used for counting the high level component of the detection signal, and counting up by one every time the high level occurs.
The calculating unit 222 is connected to the counting unit 221, and is configured to receive the count value of the counting unit 221 and calculate a frequency of occurrence of a high level component of the detection signal within a certain time. The frequency of the received detection signal can be calculated, for example, by calculating the interval between every two high level components.
The comparing unit 223 is connected to the calculating unit 222, and configured to compare whether the frequency of the detection signal is the same as the reference frequency, determine that the display panel 100 has the mobile phone interference when the frequencies are the same, and output a first control signal; when the frequencies are different, it is determined that the display panel 100 has no interference from the mobile phone, and a second control signal is output.
Further, the reference frequency is a frequency of a voice signal during a call of the mobile phone.
The timing controller TCON is configured to provide a timing control signal to the display panel 100, and has an input terminal connected to the output terminal of the detection circuit 200, and is configured to receive the control signal output by the detection circuit 200 and perform code switching when receiving the first control signal, so as to switch the timing control signal.
In this embodiment, the timing controller TCON starts to perform code switching in response to the first control signal received from the processor MCU in the detection circuit 200, for example: the amplitude of the eye diagram is increased, the common voltage VCM in the circuit is adjusted, the SSC interface of the main control chip is closed, the corresponding parameters of the equalizer EQ and the like are modified, and therefore the time sequence control signal generated by the time sequence controller 300 is switched, the source driver can receive video/image data output by the time sequence controller TCON, and mobile phone interference is improved.
Preferably, in the embodiment of the present invention, the display device further includes a source driver and a gate driver as described in fig. 2 and 3. Further, the source driver is connected to the timing controller 300 and the display panel 100, and supplies the data voltage to the display panel 100 according to a timing control signal provided from the timing controller 300. The gate driver is also connected to the timing controller 300 and the display panel 100, and sequentially supplies scan pulses to the display panel 100 according to a timing control signal supplied from the timing controller 300.
In a preferred embodiment of the present invention, the source driver and the gate driver are integrated at the periphery of the display area of the display panel 100.
In the embodiment, the display panel can automatically detect whether the mobile phone interference exists, and data code switching is performed in advance after the mobile phone interference exists, so that the display panel is prevented from entering an unlocked state, and the risk of flashing of the display panel is reduced.
Fig. 8 is a flowchart illustrating a display driving method according to an embodiment of the present invention, fig. 9 is a flowchart illustrating a method for solving an abnormality of a source driver chip according to an embodiment of the present invention, and with reference to fig. 2 to 4, in this embodiment, when the source driver chip is caused by an abnormality, the display driving method shown in fig. 8 and 9 includes:
in step S01, the system is powered up.
In step S02, an interference signal is received to generate a reference voltage signal transition.
In this embodiment, the power line 103 is disposed around the display panel 100, and when the display panel 100 has interference, the power line 103 in the display panel 100 can serve as a detection trace, receive an interference signal, and generate a jump of the reference voltage signal under the influence of the interference signal.
In step S03, it is determined whether there is a cell phone interference according to the jump of the reference voltage signal.
In this embodiment, the power line 103 is connected to the detection circuit 200, and the detection circuit 200 can determine whether the display panel 100 has the mobile phone interference according to the jump of the reference voltage signal on the power line 103. The specific judgment method comprises the following steps: setting a threshold voltage, transmitting a reference voltage signal on the power line 103 to the comparator 210, comparing the reference voltage signal with a voltage value of the threshold voltage by the comparator 210, and outputting a detection signal; the processor 220 receives the detection signal and calculates the frequency of the detection signal; and comparing whether the frequency of the detection signal is the same as the frequency of the voice signal during the call of the mobile phone, and if so, judging that the display panel 100 has mobile phone interference.
In step S04, a first control signal is generated when there is handset interference, and code switching is performed according to the first control signal.
In this embodiment, when it is determined that the display panel 100 has the mobile phone interference, the processor 220 outputs a first control signal. The timing controller 300 receives the first control signal and switches codes in advance according to the first control signal, for example: the amplitude of the eye pattern is increased, the common voltage VCM in the circuit is adjusted, the SSC interface of the main control chip is closed, the parameters of the equalizer EQ and the like are modified, thereby switching the timing control signal generated by the timing controller 300 so that the source driver can receive the video/image data output from the timing controller 300.
In step S05, the code is initialized after a period of time.
In the embodiment, whether the mobile phone interference exists can be automatically detected by the display panel, and the data code switching is carried out in advance after the mobile phone interference exists, so that the display panel is prevented from entering an unlocked state, and abnormal display of the display panel is reduced.
Meanwhile, the display driving device and the method disclosed by the invention can also be suitable for any display panel driving chip without a detection function (comprising a time sequence control chip and a source electrode driving chip), can realize the detection function of the mobile phone interference of the display panel, and are compatible with any display panel driving chip.
It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A display device, comprising:
a display panel for displaying image data according to the data signal;
the time sequence controller is used for providing a time sequence control signal for the display panel;
the power line is arranged on the periphery of the display panel and used for generating voltage jump when mobile phone interference is detected;
a detection circuit connected with the power line to obtain a reference voltage signal, for generating a corresponding detection signal according to the voltage jump of the reference voltage signal, and judging whether there is mobile phone interference by comparing the frequency of the detection signal with the reference frequency,
the time sequence controller is connected with the detection circuit and used for switching codes when mobile phone interference exists so as to switch the time sequence control signal.
2. The display device according to claim 1, wherein the detection circuit comprises:
the comparator is used for receiving the threshold voltage at a non-inverting input end, receiving the reference voltage signal at an inverting input end and generating a corresponding detection signal according to the jump of the reference voltage signal; and
and the input end of the processor is connected with the output end of the comparator and is used for receiving and judging whether the detection signal is a stable high-level signal with a certain frequency interval or not and outputting a corresponding control signal according to a judgment result.
3. The display device according to claim 2, wherein the voltage value of the threshold voltage is smaller than the voltage value of the un-toggled reference voltage signal and larger than the voltage value of the toggled reference voltage signal.
4. The display device according to claim 2, wherein the processor comprises:
a counting unit for counting a high level component of the detection signal;
the calculating unit is connected with the counting unit, receives a counting value and calculates the frequency of the high-level component of the detection signal within a certain time; and
and the comparison unit is connected with the calculation unit and used for comparing whether the frequency of the detection signal is the same as the reference frequency or not and outputting a first control signal when the frequency is the same.
5. The display device according to claim 4, wherein the reference frequency is a frequency of a voice signal during a phone call.
6. The display device according to claim 1, wherein the code switching comprises: and increasing the amplitude of the eye pattern, adjusting the common voltage, closing a corresponding interface of the main control chip, and modifying corresponding parameters of the equalizer.
7. The display device according to claim 1, further comprising:
a source driver connected to the timing controller and the display panel, for supplying a data voltage to the display panel according to the timing control signal; and
and a gate driver connected to the timing controller and the display panel for sequentially supplying scan pulses to the display panel according to the timing control signal.
8. A display driving method, comprising:
powering on the system;
receiving an interference signal to generate a reference voltage signal transition;
judging whether mobile phone interference exists according to the jump of the reference voltage signal;
generating a first control signal when the mobile phone interference exists, and switching codes according to the first control signal;
the code is initialized after a duration of time.
9. The display driving method according to claim 8, wherein the method of determining whether there is a cell phone interference comprises:
setting a threshold voltage, comparing the threshold voltage with the reference voltage signal and outputting a detection signal;
calculating the frequency of the detection signal;
and comparing whether the frequency of the detection signal is the same as the frequency of the voice signal during the call of the mobile phone, and if so, judging that the mobile phone interference exists.
10. The display driving method according to claim 8, wherein the code switching includes: and increasing the amplitude of the eye pattern, adjusting the common voltage, closing a corresponding interface of the main control chip, and modifying corresponding parameters of the equalizer.
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