Display device and electronic device

Abstract

The embodiment of the invention provides a display device and an electronic device. The display device comprises a display panel, a source driver, a time schedule controller, a level shifter and a discharge controller. And the source driver, the time schedule controller and the level converter are electrically connected with the display panel. The discharge controller is configured to output a discharge control signal to the display panel through the level shifter when the display device is in an abnormal shutdown state, and the display panel releases charges under the control of the discharge control signal. According to the embodiment of the invention, the technical problem that in the prior art, a display device adopting a structure of combining a time schedule controller and a source electrode driver cannot discharge a display panel during abnormal shutdown is solved, and occurrence of display anomalies such as display ghosting and splash screen is prevented.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and an electronic device. Background Art

[0002] At present, in-vehicle display devices mainly adopt two driving architectures: TDDI (Touch and Display Driver Integration) architecture and Tcon (Timing Controller) and SourceIC (source driver) combined architecture.

[0003] For display devices using the TDDI architecture, the TDDI driver chip integrates the discharge function during normal shutdown and abnormal shutdown, which can ensure that the display panel discharges normally in these two states. However, for display devices using a combination of a timing controller and a source driver, the timing controller only supports the discharge function during normal shutdown. The timing controller will stop working when the display device is abnormally shut down and cannot perform the discharge operation, which will cause the charge in the display panel to be unable to be released in time.

[0004] The residual charge in the display panel may cause display anomalies such as image retention and screen flickering, affecting the display quality and service life of the display device and reducing the user experience.

[0005] Therefore, how to ensure that the vehicle-mounted display device using the architecture of the combination of the timing controller and the source driver can discharge normally when abnormally shut down is a technical problem that urgently needs to be solved. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a display device and an electronic device, aiming to solve the technical problem that the existing display device using a combination of a timing controller and a source driver cannot discharge the display panel when abnormally shut down.

[0007] An embodiment of the present application provides a display device, including a display panel and a driving circuit, wherein the driving circuit is electrically connected to the display panel, and the driving circuit includes: a source driver; a timing controller; a level converter electrically connected to the timing controller and the source driver; and a discharge controller, wherein the discharge controller is configured to output a discharge control signal when the display device is in an abnormal shutdown state; wherein the driving circuit is configured to output the discharge control signal to the display panel, and the display panel is configured to release charge under the control of the discharge control signal.

[0008] In the above-mentioned display device, the discharge controller includes: a timing signal input terminal; a low-level signal generating module electrically connected to the timing signal input terminal; a high-level signal generating module electrically connected to the timing signal input terminal; and an output module electrically connected to the low-level signal generating module and the high-level signal generating module, and the output module is configured to generate the discharge control signal according to the low-level signal output by the low-level signal generating module and the high-level signal output by the high-level signal generating module.

[0009] In the above-mentioned display device, the discharge controller also includes: a power supply module, which is electrically connected to the low-level signal generating module and the high-level signal generating module, and the power supply module is configured to provide a power supply signal to the low-level signal generating module and the high-level signal generating module when it is detected that the driving voltage signal level is reduced to a preset level, and the low-level signal generating module and the high-level signal generating module are configured to generate the low-level signal and the high-level signal respectively according to the power supply signal and the timing signal received by the timing signal input terminal.

[0010] In the above-mentioned display device, the high-level signal generated by the high-level signal generating module is pulled up from the third potential to the fourth potential when the driving voltage signal is reduced from the first potential to the second potential, and is reduced from the fourth potential to the fifth potential after the discharge of the display panel is completed; the low-level signal generated by the low-level signal generating module is reduced from the sixth potential to the seventh potential when the driving voltage signal is reduced from the first potential to the second potential, and is pulled up from the seventh potential to the fifth potential after the discharge of the display panel is completed.

[0011] In the above display device, the fourth potential is maintained for a time greater than or equal to 5 milliseconds, and the seventh potential is maintained for a time greater than or equal to 5 milliseconds.

[0012] In the above-mentioned display device, the display device also includes a power manager, which is electrically connected to the discharge controller and the source driver, and the power manager is configured to provide the discharge controller with the driving voltage signal whose level is reduced to a preset level when the display device is in an abnormal shutdown state.

[0013] In the above display device, the discharge controller is in a disabled state when the display device is in a normal power-on state and a normal power-off state, and the discharge controller is in an enabled state when the display device is in an abnormal power-off state.

[0014] In the above display device, the discharge controller is electrically connected between the level converter and the display panel, and the discharge controller is configured to output the discharge control signal to the display panel.

[0015] In the above display device, the discharge controller is electrically connected between the timing controller and the level converter, and the discharge controller is configured to output the discharge control signal to the display panel through the level converter.

[0016] An embodiment of the present application further provides an electronic device, comprising the above-mentioned display device.

[0017] The display device and electronic device provided by the embodiments of the present application add a discharge controller on the basis of the display panel, the source driver and the timing controller, and configure the discharge controller to output a discharge control signal to the display panel when the display device is in an abnormal shutdown state, so that the display panel can release the charge under the control of the discharge control signal, thereby solving the technical problem in the prior art that the display device using the combined architecture of the timing controller and the source driver cannot realize the discharge of the display panel when the display device is abnormally shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a first embodiment of a display device provided in the present application.

[0019] Figure 2 is a schematic diagram of a second embodiment of a display device provided in the present application.

[0020] Figure 3 yes Figure 1 or Figure 2 Schematic diagram of a discharge controller in a display device shown.

[0021] Figure 4 yes Figure 3 The diagram is a schematic diagram of the relationship between the waveform of the signal generated by the high-level signal generating module in the discharge controller and the waveform of the driving voltage signal output by the power manager.

[0022] Figure 5 yes Figure 3 The diagram is a schematic diagram of the relationship between the waveform of the signal generated by the low-level signal generating module in the discharge controller and the waveform of the driving voltage signal output by the power manager.

[0023] Figure 6 is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0025] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0026] The embodiments of the present application may be combined with each other.

[0027] The embodiment of the present application provides a display device, such as Figure 1 As shown, the display device includes a display panel 101 and a driving circuit 102, wherein the driving circuit 102 is electrically connected to the display panel 101, and the driving circuit 102 includes a timing controller 1021, a source driver 1025, a power manager 1022, a level converter 1023, and a discharge controller 1024. The power manager 1022 is electrically connected to the source driver 1025, the timing controller 1021, the discharge controller 1024, and the level converter 1023. The timing controller 1021 is electrically connected to the level converter 1023 and the display panel 101. The level converter 1023 is electrically connected to the discharge controller 1024. The discharge controller 1024 is electrically connected to the display panel 101. The timing controller 1021, the power manager 1022, and the level converter 1023 are all arranged on a printed circuit board, and the printed circuit board is electrically connected to the display panel 101. The discharge controller 1024 is arranged on the display panel 101.

[0028] like Figure 2 As shown, the display device includes a display panel 101 and a driving circuit 102, wherein the driving circuit 102 is electrically connected to the display panel 101, and the driving circuit 102 includes a timing controller 1021, a source driver 1025, a power manager 1022, a level converter 1023, and a discharge controller 1024. The power manager 1022 is electrically connected to the source driver 1025, the timing controller 1021, the discharge controller 1024, and the level converter 1023. The timing controller 1021 is electrically connected to the discharge controller 1024, the level converter 1023, and the display panel 101. The discharge controller 1024 is electrically connected to the level converter 1023, and the level converter 1023 is electrically connected to the display panel 101. The timing controller 1021, the power manager 1022, the level converter 1023, and the discharge controller 1024 are all arranged on a printed circuit board, and the printed circuit board is electrically connected to the display panel 101.

[0029] like Figure 3As shown, the discharge controller 1024 includes a low-level signal generating module 10242, a high-level signal generating module 10241, an output module 10244, a power module 10243, a timing signal input terminal 10245, a discharge control signal output terminal 10246, a power trigger signal input terminal 10247, a driving voltage signal input terminal 10248 and an enable signal input terminal 10249. The low-level signal generating module 10242 is electrically connected to the timing signal input terminal 10245, the output module 10244, the power trigger signal input terminal 10247, and the power module 10243; the high-level signal generating module 10241 is electrically connected to the timing signal input terminal 10245, the output module 10244, the power trigger signal input terminal 10247, and the power module 10243; the power module 10243 is electrically connected to the driving voltage signal input terminal 10248 and the enable signal input terminal 10249; and the output module 10244 is electrically connected to the discharge control signal output terminal 10246.

[0030] The working process of the display device provided in the embodiment of the present application includes the following states:

[0031] 1. Normal boot status

[0032] When the display device is normally started (turned on), the timing controller 1021 is reset and outputs a normal (conventional) power-on signal to the level converter 1023. The level converter 1023 outputs a timing signal to the display panel 101. The timing signal includes a clock signal, a high-level signal, a low-level signal, and a start signal, etc. The gate driver of the display panel 101 generates a scanning signal according to these signals. At the same time, the timing controller 1021 outputs an image signal to the source driver 1025, and the power manager 1022 outputs a driving voltage signal to the source driver 1025. The driving voltage signal includes an operating voltage signal, a positive voltage signal, and a negative voltage signal. The display panel 101 displays a picture according to the scanning signal and the image signal. In this process, the power manager 1022 also outputs a driving voltage signal to the discharge controller 1024. The discharge controller 1024 is controlled by the driving voltage signal and / or the enable signal inputted by the enable signal input terminal 10249 and is in a disabled state.

[0033] 2. Normal shutdown state

[0034] When the display device is shut down normally, the timing controller 1021 outputs a normal (conventional) power-off signal to the level converter 1023, the level converter 1023 outputs a timing signal to the display panel 101, the source driver 1025 outputs a black screen signal (inserted black screen signal) to the display panel 101, the display panel 101 displays a black screen, and finally the power manager 1022 is turned off and no longer outputs a driving voltage signal to the source driver 1025, nor does it output high level signals and low level signals to the level converter 1023. During this process, the discharge controller 1024 is controlled by the driving voltage signal and / or the enable signal input by the enable signal input terminal 10249 and is in an inactive state.

[0035] 3. Abnormal shutdown state

[0036] When the display device is abnormally shut down, the timing controller 1021 stops working. Figure 3 As shown, the power trigger signal input terminal 10247 triggers the discharge controller 1024 to start, and after receiving the driving voltage signal output by the power manager 1022 and the level of which is reduced to the preset level, the power module 10243 outputs the power signal to the low level signal generating module 10242 and the high level signal generating module 10241. Driven by the power signal and the power trigger signal of the power trigger signal input terminal 10247, the low level signal generating module 10242 and the high level signal generating module 10241 generate the low level signal and the high level signal required for the discharge of the display panel 101 according to the timing signal received by the timing signal input terminal 10245, and the output module 10244 generates the discharge control signal according to these low level signals and the high level signals, and directly outputs it to the display panel 101 (such as Figure 1 ), or output to the display panel 101 through the level converter 1023 (such as Figure 2 Implementation shown).

[0037] like Figure 4 As shown, when the driving voltage signal decreases from the first potential 401 to the second potential 402 , the high level signal generated by the high level signal generating module 10241 is pulled up from the third potential 403 to the fourth potential 404 , and then decreased from the fourth potential 404 to the fifth potential 405 .

[0038] like Figure 5 As shown, when the driving voltage signal decreases from the first potential 401 to the second potential 402 , the low level signal generated by the low level signal generating module 10242 decreases from the sixth potential 501 to the seventh potential 502 , and then increases from the seventh potential 502 to the fifth potential 405 .

[0039] The display device of the embodiment of the present application can adopt two different implementations to realize the output of the discharge control signal:

[0040] The first implementation method is as follows Figure 1 As shown, the discharge controller 1024 is directly disposed on the display panel 101 , and the discharge controller 1024 is electrically connected to the level converter 1023 .

[0041] The second implementation method is as follows Figure 2 As shown, the discharge controller 1024 is disposed on a printed circuit board, and the discharge controller 1024 outputs a discharge control signal to the display panel 101 through the level converter 1023 .

[0042] In the above two implementations, the internal structure and working principle of the discharge controller 1024 are the same. Figure 3 As shown, the power module 10243 of the discharge controller 1024 receives the driving voltage signal output by the power manager 1022 through the driving voltage signal input terminal 10248. When the display device is in an abnormal shutdown state, the level of the driving voltage signal will be reduced to a preset level. At this time, the power module 10243 detects this change and then outputs the power signal to the low-level signal generating module 10242 and the high-level signal generating module 10241. The low-level signal generating module 10242 and the high-level signal generating module 10241 start working after receiving the power signal and the power trigger signal input by the power trigger signal input terminal 10247. These two modules also receive the timing signal through the timing signal input terminal 10245, and generate a low-level signal and a high-level signal respectively according to the timing signal. The output module 10244 receives these two signals and generates the final discharge control signal according to these two signals.

[0043] like Figure 4 and Figure 5 As shown, the waveforms of the low-level signal and the high-level signal have a specific change rule. When the driving voltage signal decreases from the first potential 401 to the second potential 402, it indicates that the display device is in an abnormal shutdown state, the high-level signal first rises from the third potential 403 to the fourth potential 404, and then decreases to the fifth potential 405 after a discharge process of greater than or equal to 5 milliseconds, while the low-level signal first decreases from the sixth potential 501 to the seventh potential 502, and then rises to the eighth potential 503 after a discharge process of greater than or equal to 5 milliseconds, and the eighth potential 503 is equal to the fifth potential 405.

[0044] The display device provided in the embodiment of the present application can be applied to a variety of vehicle-mounted display products, such as a vehicle-mounted central control display module, a vehicle-mounted instrument display module, a vehicle-mounted streaming media rearview mirror, a vehicle-mounted driving recorder, etc. These products all adopt a driving architecture combining a timing controller 1021 and a source driver 1025. The discharge controller 1024 provided in the embodiment of the present application can effectively solve the discharge problem of the display panel 101 when such products are abnormally shut down, thereby improving the display quality and reliability of the products.

[0045] The display device provided in the embodiment of the present application realizes controllable discharge of the display panel 101 by adding a discharge controller 1024, and configuring the discharge controller 1024 to generate and output a discharge control signal in an abnormal shutdown state, thereby effectively preventing the occurrence of display anomalies such as display afterimages and screen flickering.

[0046] like Figure 1 As shown, the first embodiment of the display device provided by the present application includes a display panel 101 and a driving circuit 102, wherein the driving circuit 102 is electrically connected to the display panel 101, and the driving circuit 102 includes a source driver 1025, a timing controller 1021, a level converter 1023, and a discharge controller 1024. The source driver 1025 is electrically connected to the display panel 101, the timing controller 1021 is electrically connected to the display panel 101, the level converter 1023 is electrically connected to the timing controller 1021 and the source driver 1025, and the discharge controller 1024 is electrically connected to the level converter 1023 and the gate driver of the display panel 101.

[0047] The display panel 101 may be, for example, a liquid crystal display panel 101 or the like. The display panel 101 includes a display area and a non-display area. The display area is provided with m×n pixel units arranged in an array, wherein m and n are integers greater than 1. The non-display area is located around the display area and is used to arrange a drive circuit and various signal lines. The display panel 101 also includes a plurality of scan lines, a plurality of data lines and a gate driver. The plurality of scan lines extend along a first direction and are arranged along a second direction, and the plurality of data lines extend along a second direction and are arranged along the first direction, and the first direction is perpendicular to the second direction. The gate driver is provided in the non-display area and is electrically connected to the plurality of scan lines. The source driver 1025 is electrically connected to the plurality of data lines through a flexible circuit board. The timing controller 1021 is electrically connected to the gate driver and the source driver 1025, respectively.

[0048] The display panel 101 includes a thin film transistor array substrate, an opposing substrate, and a liquid crystal layer disposed between the two substrates. The thin film transistor array substrate includes a glass substrate, a first metal layer disposed on the glass substrate, a gate insulating layer disposed on the first metal layer, a semiconductor layer disposed on the gate insulating layer, a second metal layer disposed on the semiconductor layer, a passivation layer disposed on the second metal layer, and a pixel electrode disposed on the passivation layer. The first metal layer includes a scan line, a gate electrode, etc. The second metal layer includes a data line, a source electrode, a drain electrode, etc. The opposing substrate includes a glass substrate, a black matrix disposed on the glass substrate, a color filter layer disposed on the black matrix, and a common electrode disposed on the color filter layer.

[0049] Each pixel unit includes at least one thin film transistor and a pixel electrode. The gate of the thin film transistor is electrically connected to the corresponding scan line, the source is electrically connected to the corresponding data line, and the drain is electrically connected to the corresponding pixel electrode. When the scan line outputs a high-level scan signal, the thin film transistor is turned on, and the data signal on the data line is transmitted to the pixel electrode through the thin film transistor; when the scan line outputs a low-level scan signal, the thin film transistor is turned off, and the pixel electrode maintains the voltage corresponding to the data signal.

[0050] The gate driver includes n-stage cascaded gate driving units, and each stage of the gate driving unit is electrically connected to a scan line. Under the control of the timing controller 1021, the gate driving unit sequentially outputs a scan signal to scan each row of pixel units in the display area line by line. The source driver 1025 can be an integrated circuit chip, and the source driver 1025 includes a plurality of digital-to-analog conversion units. The source driver 1025 is used to convert a digital image signal (image data) into an analog voltage signal and output it to the data line of the display panel 101 under the control of the timing controller 1021. The timing controller 1021 is used to receive and process externally input image data and timing signals, and drive the gate driver and the source driver 1025. The power manager 1022 is used to provide operating voltages for various parts of the liquid crystal display panel 101, including providing a common voltage for a common electrode, providing a gate driving voltage for a gate driver, and providing a gamma voltage for the source driver 1025.

[0051] The timing controller 1021 is used to provide driving signals to the gate driver and the source driver 1025 of the display panel 101 in a normal power-on state, and to control the display panel 101 to release charges through the gate driver and the source driver 1025 in a normal power-off state.

[0052] The discharge controller 1024 is configured to output a discharge control signal to the display panel 101 when the display device is in an abnormal shutdown state.

[0053] The driving circuit 102 is configured to output the discharge control signal to the display panel 101 , and the display panel 101 is configured to release charges under the control of the discharge control signal, specifically, to release charges in pixel units of the display panel 101 .

[0054] In this embodiment, the discharge controller 1024 is electrically connected between the level converter 1023 and the display panel 101 , and the discharge controller 1024 is configured to output the discharge control signal to the display panel 101 .

[0055] Specifically, in the normal power-on state, the timing controller 1021 first generates multiple clock signals and start signals, which are converted by the level converter 1023 and then output to the gate driver of the display panel 101. The gate driver generates scan signals based on these signals, and these scan signals are used to turn on the thin film transistors of each row of pixel units in sequence. At the same time, the timing controller 1021 processes the input image data and outputs it to the source driver 1025. The digital-to-analog conversion unit of the source driver 1025 converts the received digital image signal into a corresponding analog voltage signal, and writes these analog voltage signals into the corresponding pixel unit when the gate driver turns on the thin film transistor of a row of pixel units.

[0056] In the normal shutdown state, the timing controller 1021 first controls the source driver 1025 to output a black screen voltage signal, that is, to charge all pixel units with the black screen voltage, and then controls the gate driver to sequentially turn on the thin film transistors of each row of pixel units, so that the charge in the pixel unit can be released through the data line. This discharge process during normal shutdown is controlled, which can ensure that the charge in the display panel 101 is completely released.

[0057] In the abnormal shutdown state, the timing controller 1021 stops working because it loses the working power supply. At this time, the discharge controller 1024 takes over the discharge control operation of the display panel 101. The discharge controller 1024 generates a discharge control signal including high and low level signals according to the preset discharge timing. These signals are converted by the level converter 1023 and output to the gate driver of the display panel 101, so that the gate driver can still turn on the thin film transistor of the pixel unit when the display device is abnormally shut down, thereby realizing the discharge of the display panel 101, that is, the gate driver still maintains the minimum working capacity in the absence of the driving of the timing controller 1021, thereby turning on the thin film transistor of the pixel unit and realizing the emergency discharge of the display panel 101. Although this emergency discharge is not as accurate as the discharge process during normal shutdown, it can ensure that most of the charge is released to prevent display abnormalities.

[0058] like Figure 3As shown, the discharge controller 1024 includes a timing signal input terminal 10245, a low level signal generating module 10242, a high level signal generating module 10241, a power supply module 10243, and an output module 10244.

[0059] The low level signal generating module 10242 is electrically connected to the timing signal input terminal 10245 .

[0060] The high level signal generating module 10241 is electrically connected to the timing signal input terminal 10245 .

[0061] The power supply module 10243 is electrically connected to the low level signal generating module 10242 and the high level signal generating module 10241. The power supply module 10243 is configured to provide a power supply signal to the low level signal generating module 10242 and the high level signal generating module 10241 when it is detected that the driving voltage signal level is reduced to a preset level. The low level signal generating module 10242 and the high level signal generating module 10241 are configured to generate a low level signal and a high level signal respectively according to the power supply signal and the timing signal received by the timing signal input terminal 10245.

[0062] The output module 10244 is electrically connected to the low-level signal generating module 10242 and the high-level signal generating module 10241. The output module 10244 is configured to generate a discharge control signal based on the low-level signal output by the low-level signal generating module 10242 and the high-level signal output by the high-level signal generating module 10241, and output the discharge control signal to the display panel 101.

[0063] The low-level signal generating module 10242 is an analog circuit composed of an operational amplifier and a voltage comparator, including a signal sampling unit, a level adjustment unit and an output driving unit. The signal sampling unit is used to sample the timing signal input by the timing signal input terminal 10245, the level adjustment unit is used to dynamically adjust the output level according to the sampling result, and the output driving unit is used to provide sufficient driving capability to ensure the stable output of the low-level signal. The high-level signal generating module 10241 is also implemented by an analog circuit composed of an operational amplifier and a voltage comparator, and also includes a signal sampling unit, a level adjustment unit and an output driving unit, wherein the structure of the signal sampling unit and the output driving unit is the same as that of the low-level signal generating module 10242, but the level adjustment unit adopts a different reference voltage source, wherein the reference voltage source provides a positive voltage as a reference level.

[0064] The power module 10243 includes a voltage detection unit, a power conversion unit and a power control unit. The voltage detection unit is a voltage comparator circuit, which is used to monitor the level change of the driving voltage signal in real time, and trigger the power control unit when the level of the driving voltage signal is detected to be reduced to a preset level. The power control unit is a digital control circuit, which is used to control the working state of the power conversion unit according to the monitoring result. The power conversion unit is a DC-DC conversion circuit, which is used to convert the input driving voltage signal into the working voltage required by the low-level signal generation module 10242 and the high-level signal generation module 10241.

[0065] The output module 10244 is a signal synthesis circuit composed of a multi-stage operational amplifier, including a signal selection unit, a level synthesis unit and an output buffer unit. The signal selection unit alternately selects low-level signals and high-level signals according to preset timing requirements, the level synthesis unit synthesizes the selected signals, and the output buffer unit provides sufficient driving capability to ensure that the discharge control signal can be transmitted to the display panel 101.

[0066] like Figure 4 As shown, the high level signal generated by the high level signal generating module 10241 is pulled up from the third potential 403 to the fourth potential 404 when the driving voltage signal decreases from the first potential 401 to the second potential 402, and is decreased from the fourth potential 404 to the fifth potential 405 after the discharge of the display panel 101 is completed.

[0067] like Figure 5 As shown, the low level signal generated by the low level signal generating module 10242 is reduced from the sixth potential 501 to the seventh potential 502 when the driving voltage signal is reduced from the first potential 401 to the second potential 402, and is pulled up from the seventh potential 502 to the eighth potential 503 after the discharge of the display panel 101 is completed. The eighth potential is equal to the fifth potential 405.

[0068] The fifth potential 405 is the ground potential (GND), and the discharge time of the display panel 101 is greater than or equal to 5 milliseconds, that is, the maintenance time of the fourth potential 404 is greater than or equal to 5 milliseconds, and the maintenance time of the seventh potential 502 is greater than or equal to 5 milliseconds.

[0069] The display device further includes a power manager 1022 , which is electrically connected to the discharge controller 1024 and the source driver 1025 . The power manager 1022 is configured to provide a driving voltage signal whose level is reduced to a preset level to the discharge controller 1024 when the display device is in an abnormal shutdown state.

[0070] The discharge controller 1024 is in a disabled state when the display device is in a normal power-on state or a normal power-off state, and is in an enabled state when the display device is in an abnormal power-off state. Disabling means not working or being disabled; enabling means being triggered to work or being enabled.

[0071] In the normal startup and normal shutdown states, the discharge controller 1024 is kept in the disabled state under the control of the enable control signal, at which time the power supply signal of each functional module is turned off and the power consumption is reduced to the minimum. After detecting the abnormal shutdown signal, the enable control signal activates the power module 10243, so that the discharge controller 1024 enters the enabled state and starts to perform the discharge control operation.

[0072] In the normal startup and normal shutdown states, the discharge controller 1024 is ensured to be in a disabled state through an enable control signal. The enable control signal is fixed at a low level through a pull-up resistor, which can prevent the discharge controller 1024 from being enabled by mistake.

[0073] During abnormal shutdown, when it is detected that the driving voltage signal drops to a preset level, the discharge controller 1024 first unlocks the enable control signal, then activates the internal clock generator, and then enables the power supply of each functional module in turn.

[0074] In addition, the display device provided in the embodiment of the present application further includes a temperature sensor and an analog-to-digital converter, and the discharge controller 1024 further includes a compensation control module. The temperature sensor is used to monitor the temperature of the working environment in real time. The analog-to-digital converter is used to convert the analog signal of the temperature value output by the temperature sensor into a digital signal. The compensation control module is used to obtain the corresponding compensation parameter from the pre-stored lookup table according to the temperature value of the current working environment, and the compensation parameter is used to adjust the level and timing parameters of the discharge control signal.

[0075] For example, when the ambient temperature is in the range of -40°C to 0°C, since the low temperature will cause the response speed of the display panel 101 to slow down, the compensation control module increases the fourth potential 404 of the high-level signal from 10V to 12V and extends the holding time of the signal from 5ms to 8ms to ensure sufficient discharge. When the ambient temperature is in the range of 0°C to 40°C, the discharge control signal maintains the standard parameters unchanged. When the ambient temperature is in the range of 40°C to 80°C, the compensation control module reduces the fourth potential 404 of the high-level signal to 8V and shortens the holding time of the signal to 3ms to prevent excessive discharge from damaging the display panel 101.

[0076] The compensation method of the low-level signal is similar to that of the high-level signal: in the range of -40°C to 0°C, the seventh potential 502 is reduced from -10V to -12V, and the holding time is extended to 8ms; in the range of 40°C to 80°C, the seventh potential 502 is increased to -8V, and the holding time is shortened to 3ms. This technical solution ensures that the display device can maintain stable discharge performance under different temperature conditions. This is particularly important for vehicle-mounted display devices because the temperature range of the vehicle environment is large.

[0077] like Figure 2 As shown, the first embodiment of the display device provided by the present application is similar to the above-mentioned first embodiment, except that:

[0078] In this embodiment, the discharge controller 1024 is electrically connected between the timing controller 1021 and the level converter 1023 , and the discharge controller is configured to output the discharge control signal to the display panel 101 through the level converter 1023 .

[0079] The level converter 1023 is electrically connected to the display panel 101 , the timing controller 1021 , and the source driver 1025 .

[0080] The discharge controller 1024 is electrically connected to the timing controller 1021 and the level converter 1023. The discharge controller 1024 is configured to output a discharge control signal to the display panel 101 through the level converter 1023 when the display device is in an abnormal shutdown state. The level converter 1023 is used to convert the level of the discharge control signal and output it to the display panel 101.

[0081] The output module 10244 is configured to generate a discharge control signal according to the low level signal output by the low level signal generating module 10242 and the high level signal output by the high level signal generating module 10241 , and output the discharge control signal to the display panel 101 through the level converter 1023 .

[0082] In normal working state, the discharge controller 1024 is also used to receive configuration data sent by the timing controller 1021 to adjust the discharge parameters; in abnormal shutdown state, the timing controller 1021 stops working, and the discharge controller 1024 is used to generate a discharge control signal according to the discharge parameters.

[0083] like Figure 6 As shown, an embodiment of the present application further provides an electronic device, which includes a display device. The electronic device may be, for example, a mobile phone, a television, a laptop, a display, a tablet computer, etc.

[0084] The display device and electronic device provided by the embodiments of the present application are provided with a discharge controller 1024 on the basis of the display panel 101, the source driver 1025 and the timing controller 1021, and the discharge controller 1024 is configured to output a discharge control signal to the display panel 101 when the display device is in an abnormal shutdown state, so that the display panel 101 can release the charge under the control of the discharge control signal, thereby solving the technical problem in the prior art that the display device using the combined architecture of the timing controller 1021 and the source driver 1025 cannot realize the discharge of the display panel 101 when the display device is abnormally shut down.

[0085] In addition, the discharge controller 1024 of the display device and the electronic device provided in the embodiments of the present application is in a disabled state in the normal power-on state and the normal power-off state, and is only enabled in the abnormal power-off state, ensuring that the discharge controller 1024 does not interfere with the normal operation of the display device, while being able to play a role in time during abnormal power-off.

[0086] Through the above technical solution, the display device and electronic device provided by the embodiments of the present application can release the charge in the display panel 101 in a timely and reliably manner during abnormal shutdown, effectively preventing the occurrence of display anomalies such as display afterimages and screen flickering, and improving the display quality and service life of the display device.

[0087] The embodiments of the present application are described in detail above, and the contents of this specification should not be construed as limiting the scope of protection of the present application.

Claims

1. A display device, characterized in that: The device comprises a display panel and a driving circuit, wherein the driving circuit is electrically connected to the display panel, and the driving circuit comprises: Source driver; Timing controller; a level converter, electrically connected to the timing controller and the source driver; and a discharge controller configured to output a discharge control signal when the display device is in an abnormal shutdown state; The driving circuit is configured to output the discharge control signal to the display panel, and the display panel is configured to release charges under the control of the discharge control signal.

2. The display device according to claim 1, characterized in that The discharge controller comprises: Timing signal input terminal; A low level signal generating module, electrically connected to the timing signal input terminal; a high level signal generating module, electrically connected to the timing signal input terminal; and An output module is electrically connected to the low-level signal generating module and the high-level signal generating module, and the output module is configured to generate the discharge control signal according to the low-level signal output by the low-level signal generating module and the high-level signal output by the high-level signal generating module.

3. The display device according to claim 2, characterized in that: The discharge controller further comprises: A power supply module is electrically connected to the low-level signal generating module and the high-level signal generating module. The power supply module is configured to provide a power supply signal to the low-level signal generating module and the high-level signal generating module when it is detected that the driving voltage signal level is reduced to a preset level. The low-level signal generating module and the high-level signal generating module are configured to generate the low-level signal and the high-level signal respectively according to the power supply signal and the timing signal received by the timing signal input terminal.

4. The display device according to claim 2, characterized in that: The high-level signal generated by the high-level signal generating module is pulled up from the third potential to the fourth potential when the driving voltage signal decreases from the first potential to the second potential, and is decreased from the fourth potential to the fifth potential after the discharge of the display panel is completed; The low-level signal generated by the low-level signal generating module decreases from the sixth potential to the seventh potential when the driving voltage signal decreases from the first potential to the second potential, and increases from the seventh potential to the fifth potential after the discharge of the display panel ends.

5. The display device according to claim 4, characterized in that: The fourth potential is maintained for a time greater than or equal to 5 milliseconds, and the seventh potential is maintained for a time greater than or equal to 5 milliseconds.

6. The display device according to claim 1, characterized in that: The display device further includes a power manager electrically connected to the discharge controller and the source driver, and configured to provide the discharge controller with the driving voltage signal whose level is reduced to a preset level when the display device is in an abnormal shutdown state.

7. The display device according to claim 1, characterized in that: The discharge controller is in a disabled state when the display device is in a normal power-on state and a normal power-off state, and is in an enabled state when the display device is in an abnormal power-off state.

8. The display device according to claim 1, characterized in that: The discharge controller is electrically connected between the level converter and the display panel, and is configured to output the discharge control signal to the display panel.

9. The display device according to claim 1, characterized in that: The discharge controller is electrically connected between the timing controller and the level converter, and is configured to output the discharge control signal to the display panel through the level converter.

10. An electronic device, characterized in that: Comprising the display device as claimed in any one of claims 1 to 9.

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