Control methods and control equipment for ceiling-mounted screens

Abstract

This application discloses a control method and control device for a ceiling-mounted screen. The control method includes: real-time detection of the values ​​of each touch capacitor on the touch display screen using a touch chip; determining whether the touch display screen is in a closed state based on the values ​​of each touch capacitor using the touch chip; if the touch display screen is in a closed state, generating an indication signal and sending it to the display driver chip; if the touch display screen is in an open state, reporting the touch signal of the touch display screen to the main controller; and when the touch display screen is in a closed state, the display driver chip controls the gate drive circuit to stop outputting pulses to the pixel matrix so that the touch display screen stops refreshing the display screen. Since the gate drive circuit stops outputting line scanning pulses, it can no longer generate an alternating electric field, eliminating the main source of alternating electric field in the touch display screen surface, avoiding capacitive coupling between the touch display screen and the casing, and suppressing electromagnetic interference radiation.

Description

Technical Field

[0001] This application relates to the field of automotive electronic electromagnetic compatibility technology, and in particular to a control method and control device for a ceiling-mounted screen. Background Technology

[0002] In the development and verification of automotive electronic devices, electromagnetic compatibility (EMC) is a mandatory indicator that must be strictly controlled. During automotive EMC testing, it was found that when the ceiling-mounted screen is unfolded, it can usually pass conducted emission tests smoothly and does not cause significant electromagnetic radiation interference to the vehicle's power signals and related wiring harnesses. However, when the ceiling-mounted screen is closed, i.e., when the screen display surface is attached to the top metal casing, the coupling energy generated by the high-frequency scanning and driving inside the display is directly conducted to the top casing through the tight contact between the screen and the top casing. This results in serious electromagnetic interference (EMI) problems for the automotive ceiling-mounted screen when it is closed. Summary of the Invention

[0003] This application provides a control method and control device for a ceiling-mounted screen that can improve electromagnetic interference problems when the screen is closed.

[0004] In a first aspect, this application provides a control method for a ceiling-mounted screen. The ceiling-mounted screen includes a housing, a shock-absorbing pad, and a touch display screen. The housing is provided with a wiring harness, the shock-absorbing pad is embedded in the housing, the touch display screen rotates relative to the housing, and the touch display screen is provided with a main controller, a touch chip, a display driver chip, a touch capacitor, a gate drive circuit, and a pixel matrix. The methods include: The value of each touch capacitor on the touch screen is detected in real time by the touch chip; The touch chip determines whether the touch display is in a closed state based on the values ​​of each touch capacitor. If the touch display is in a closed state, an indication signal is generated and sent to the display driver chip. If the touch display is in an open state, the touch signal of the touch display is reported to the main controller. When the touch display is in a closed state, the light-emitting surface of the touch display is attached to the housing and in contact with the anti-vibration pad, and the pulse output by the gate drive circuit is coupled to the housing. When the touch screen is closed, the display driver chip controls the gate drive circuit to stop outputting pulses to the pixel matrix so that the touch screen stops refreshing the display screen.

[0005] In some feasible implementations, the touch display screen also includes a source driver chip, and the method further includes: the source driver chip remains active in both the closed and open states of the touch display screen, and the active state includes, but is not limited to: The source driver chip continuously receives image data; The source driver chip continuously outputs analog grayscale voltage to the data lines corresponding to the pixel matrix.

[0006] In some feasible implementations, the touch display screen also includes a backlight driver chip and a backlight module; other methods include: When the touch screen is closed, the backlight driver chip stops outputting pulse signals to the backlight module.

[0007] In some feasible implementations, the touch chip determines whether the touch display is in a closed state based on the values ​​of each touch capacitor, including: Retrieve the pre-stored capacitor reference value; The value of each touch capacitor and the reference capacitance value determine whether the touch display screen is in the closed state.

[0008] In some feasible implementations, the state of the touch display screen being closed is determined based on the values ​​of each touch capacitor and a capacitance reference value, including: The change value of each touch capacitor is obtained by calculating the difference between the value of each touch capacitor and the reference value of the capacitor; The touch screen is in a closed state when the change value of each touch capacitor is determined based on the first preset threshold. When there are multiple touch capacitors on the touch screen with a change value greater than or equal to the first preset threshold, the touch screen is in a closed state.

[0009] In some feasible implementations, the method further includes determining whether the touch screen is in a closed state based on the distribution state of multiple touch capacitors whose change value is greater than or equal to a first preset threshold. When the distribution state meets the preset conditions, the touch screen is in a closed state. The preset conditions include: The coordinates of multiple touch capacitive sensors are concentrated in the contact area between the touch display and the shock-absorbing pad; and, Multiple touch capacitive touch areas correspond to a second preset threshold; and, Within a preset time period, the coordinate positions of the multiple touch capacitive sensors did not shift; and, Within a preset time period, the coordinate positions of multiple touch capacitive devices do not show any coordinate changes that match the click frequency.

[0010] In some feasible implementations, if the coordinate positions of multiple touch capacitive devices do not shift within a preset time, the determination process includes: Obtain the coordinates of multiple touch capacitors; Calculate the displacement distance between the current coordinates and the previous coordinates of each touch capacitor. If the displacement distance is less than the third preset threshold within a preset time, then the coordinate positions of the multiple touch capacitors have not shifted.

[0011] In some feasible implementations, if the coordinate positions of multiple touch capacitive sensors do not show any coordinate changes consistent with the click frequency within a preset time period, the determination process includes: Determine whether multiple touch capacitives have generated a lift-off event. If the change value of the touch capacitives drops from greater than a first preset threshold to less than the first preset threshold, then the touch capacitives have generated a lift-off event. If no lift-off event is detected within the preset time, or if the frequency of detected lift-off events is lower than the fourth preset threshold, then the coordinate positions of the multiple touch capacities will not have coordinate changes that match the click frequency.

[0012] In some feasible implementations, after determining that the touch display is in a closed state, the method also includes: The touch chip detects the changes in the values ​​of each touch capacitor on the touch screen in real time. When the change values ​​of each touch capacitor are less than the first preset threshold, it is determined that the touch display screen is in an open state. The touch chip resumes reporting the touch signal of the touch display screen to the main controller, and the display driver chip controls the gate drive circuit to output pulses to the pixel matrix again so that the touch display screen resumes refreshing the display screen.

[0013] Secondly, this application provides a control device for a ceiling-mounted screen, including a memory and a processor. The memory stores computer-executable instructions, and the processor executes the computer-executable instructions stored in the memory, causing the processor to perform the control method as described in the first aspect.

[0014] This application uses a touch chip to obtain the capacitance values ​​of each touch capacitor within the touch display in real time, and determines whether the touch display is in a closed state based on these values. When the touch display is in a closed state, the display driver chip controls the gate drive circuit to stop outputting horizontal scanning pulses, thereby stopping the touch display from refreshing the screen. In this state, since the gate drive circuit stops outputting horizontal scanning pulses, no alternating electric field can be generated, eliminating the main source of alternating electric field within the touch display surface, avoiding capacitive coupling between the touch display and the casing, and suppressing electromagnetic interference radiation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1This is a schematic diagram of the structure of the ceiling screen provided in the embodiments of this application; Figure 2 A schematic diagram of a touch display screen provided in an embodiment of this application; Figure 3 This is a schematic diagram of the communication between internal components of a touch display screen provided in an embodiment of this application; Figure 4 A flowchart of the control method provided in the embodiments of this application; Figure 5 This is a schematic diagram of the pulse output by the gate drive line in an embodiment of this application; Figure 6 for Figure 4 The flowchart of step S102 in the method shown; Figure 7 This is a schematic diagram of the control device for the ceiling screen provided in an embodiment of this application.

[0017] Attached image captions: 1000-Ceiling-mounted screen, 100-Casing, 200-Anti-vibration pad, 300-Touch display screen, 310-Main controller, 320-Touch chip, 330-Display driver chip, 340-Touch capacitor, 350-Gate driver circuit, 360-Pixel matrix, 370-Source driver chip, 380-Backlight driver chip, 390-Backlight module, 401-Processor, 402-Communication interface, 403-Memory, 404-Bus, 405-Computer-readable instructions. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings.

[0019] Please see Figure 1 The ceiling-mounted screen 1000 includes a housing 100, a shock-absorbing pad 200, and a touch screen 300. The housing 100 is equipped with a wiring harness. The shock-absorbing pad 200 is embedded in the housing 100. The touch screen 300 rotates relative to the housing 100. When the touch screen 300 is in the closed state, the light-emitting surface of the touch screen 300 is attached to the housing 100 and in contact with the shock-absorbing pad 200. The pulse output by the gate drive circuit 350 is coupled to the housing 100.

[0020] The housing 100 is used to fix the touch display screen 300 and its electronic components. Since the ceiling-mounted screen 1000 needs to meet structural strength and heat dissipation requirements, its material is metal. The wiring harness provided in the housing 100 can be a wiring harness located inside the housing 100, a wiring harness passing through the housing 100, or a wiring harness fixed to the perimeter of the housing 100 by external force. This wiring harness can be a power harness or a signal harness, etc.

[0021] When the touch display screen 300 is closed, its light-emitting surface is tightly bonded to the inner surface of the metal housing 100. This makes it easy for the metal housing 100 to form capacitive coupling with the gate drive circuit 350 inside the touch display screen 300. The shock-absorbing pad 200 can be embedded in the corners or edges of the inner side of the housing 100 to prevent damage caused by hard collisions between the touch display screen 300 and the housing 100. The shock-absorbing pad 200 can be made of insulating cushioning materials with a certain compressibility, such as silicone, rubber, or elastic foam. When the touch display screen 300 is closed and presses against the shock-absorbing pad 200, it causes deformation and a change in capacitance value in the corresponding area of ​​the touch display screen 300, thus providing a basis for touch detection.

[0022] Please see Figure 2 and Figure 3 The touch display screen 300 includes a main controller 310, a touch chip 320, a display driver chip 330, a touch capacitor 340, a gate drive circuit 350, and a pixel matrix 360. The touch sensor (touch capacitor 340) of the touch display screen 300 is directly integrated within the pixel matrix 360, and can be a TFT-LCD liquid crystal touch display screen 300 employing built-in touch technology. The touch capacitor 340 is a parasitic capacitance formed by transparent ITO electrodes, used to sense proximity or pressure on the surface of the touch display screen 300. The main controller 310 can be a system-on-a-chip or a microcontroller unit (MCU). The main controller 310 communicates with the display driver chip 330 to send the image or video stream to be displayed to the display driver chip 330. The main controller 310 also communicates with the touch chip 320 to receive touch signals within the touch display screen 300. The touch chip 320 can be configured independently or integrated with the display driver chip 330 as a Touch and Display Driver Integration (TDDI) chip. The touch chip 320 drives and scans the touch capacitors 340 within the surface of the touch display screen 300 to obtain their values. The display driver chip 330 can be configured independently or integrated with the touch chip 320 as a TDDI chip. The display driver chip 330 receives image data transmitted from the main controller 310 and converts it into driving timing. Under the control of the display driver chip 330, the gate drive line 350 outputs line scan pulses line by line to control the switching of the thin-film transistors in the corresponding rows of the pixel array, allowing image data to be written and thus updating the displayed image on the touch display screen 300.

[0023] Because the row scanning pulse output by the gate drive line 350 is a high-frequency periodic pulse, such as a high-frequency square wave pulse, it needs to drive the entire row of thin-film transistors to turn on in a short time. It has a high voltage swing and transient large current, making it a major source of high-frequency electromagnetic noise within the touch display screen 300. It is prone to capacitive coupling with the housing 100 when the touch display screen 300 is closed. Due to the large contact area between the housing 100 and the touch display screen 300, and the large area of ​​the housing 100 itself, capacitive coupling causes the housing 100 to form an equivalent radiating antenna, converting the coupled high-frequency noise into secondary radiation. This radiation affects power or signal lines surrounding or passing through the housing 100, leading to electromagnetic interference. This application provides a method to stop the row pulse output by controlling the gate drive line 350 with the display driver chip 330 when the touch display screen 300 is closed, thereby preventing capacitive coupling between the row scanning pulse output by the gate drive line 350 and the housing 100, which would cause electromagnetic interference.

[0024] Please see Figure 4 The present application provides a control method for a ceiling-mounted screen 1000, comprising the following steps: S101 uses a touch chip to detect the values ​​of each touch capacitor on the touch display screen in real time.

[0025] During the normal operating cycle of the touch display screen 300, the touch chip 320 sequentially sends driving signals to the touch capacitors 340 in each row / column of the touch display screen 300 according to the set scanning frequency, and receives sensing signals to calculate the real-time capacitance value of each touch node. This detection process continues in the background and does not affect the normal display of the touch display screen 300.

[0026] S102, the touch chip determines whether the touch display is in a closed state based on the value of each touch capacitor. If the touch display is in a closed state, an indication signal is generated and sent to the display driver chip; if the touch display is in an open state, the touch signal of the touch display is reported to the main controller.

[0027] When a user touches the screen with their finger, only a small number of touch capacitors 340 on the touch display 300 experience a slight shift in capacitance. The decision logic inside the touch chip 320 identifies this feature, calculates the specific touch coordinates, and reports the touch signal containing the coordinate information to the main controller 310 to execute a normal human-computer interaction response.

[0028] When the touch display screen 300 is closed onto the housing 100, the anti-vibration pads 200 on the housing 100 press against the touch display screen 300, causing mechanical deformation of the large-area touch capacitor 340 at the location of the anti-vibration pads 200 on the touch display screen 300. This results in a significant and large-amplitude capacitance value shift (far exceeding the amplitude of normal finger touch, and distributed over a large area in multiple points). The touch chip 320 determines that this specific capacitance change characteristic meets the closing condition. At this time, the touch chip 320 no longer reports touch signals to the main controller 310, but instead switches to generating specific indicator signals for indicating the prevention of accidental touches or for indicating that the touch display screen 300 is in the closed state, and sends them to the display driver chip 330.

[0029] S103, when the touch display is in the closed state, the display driver chip controls the gate drive circuit to stop outputting pulses to the pixel matrix so that the touch display stops refreshing the display screen.

[0030] Please see Figure 5 Upon receiving the indication signal, the display driver chip 330 determines that the touch display screen 300 is in a closed state and enters the anti-mistouch mode. At this time, the display driver chip 330 does not cut off image data reception from the main controller 310, nor does it shut down its internal source drive processing logic. Instead, it forcibly pulls the start signal and clock signal output by its internal timing controller, used to trigger the gate shift register, low to a low level. Due to the loss of the trigger pulse, the gate drive line 350 stops outputting row scan pulses; that is, the row scan pulses from row 1 to row N remain low when the touch display screen is closed. All thin-film transistor switches within the pixel matrix 360 remain off, source data cannot be written, and the touch display screen 300 stops refreshing the display image.

[0031] This application uses the touch chip 320 to obtain the capacitance values ​​of each touch capacitor 340 within the touch display screen 300 in real time, and determines whether the touch display screen 300 is in a closed state based on the capacitance values ​​of each touch capacitor 340. When the touch display screen 300 is in a closed state, the display driver chip 330 controls the gate drive line 350 to stop outputting horizontal scanning pulses, thereby stopping the touch display screen 300 from refreshing the display screen. In this state, since the gate drive line 350 stops outputting horizontal scanning pulses, it can no longer generate an alternating electric field, eliminating the main source of alternating electric field within the surface of the touch display screen 300, avoiding capacitive coupling between the gate drive line 350 and the housing 100, and suppressing electromagnetic interference radiation.

[0032] Please see Figure 3The touch display screen 300 also includes a source driver chip 370. The method further includes: the source driver chip 370 remains active in both the closed and open states of the touch display screen 300. The active state includes, but is not limited to: the source driver chip 370 continuously receiving image data; and the source driver chip 370 continuously outputting analog grayscale voltage to the data line corresponding to the pixel matrix 360.

[0033] When the touch display screen 300 is open, the source driver chip 370 receives the image data parsed by the display driver chip 330, converts it into corresponding analog grayscale voltages via an internal digital-to-analog converter, and charges the liquid crystal capacitors of the pixel matrix 360 with the analog grayscale voltages when the gate drive line 350 turns on the thin-film transistor switch, thus enabling normal image display. When the touch display screen 300 is closed, after receiving an indication signal, the display driver chip 330's internal timing controller only cuts off the start signal and shift clock signal output to the gate drive line 350, while continuing to output data clock signals, data enable signals, and serial image data to the source driver chip 370. Because the source driver chip 370 can still receive complete clock and data enable signals, its internal shift register and latch can continue to operate synchronously, thus enabling continuous reception of image data. When the screen is closed, because the gate drive line 350 stops outputting pulses, all thin-film transistors in all rows of the pixel matrix 360 are in the off state. At this time, although the source driver chip 370 continuously outputs analog grayscale voltage to the data lines corresponding to the pixel matrix 360, since the thin-film transistor is not turned on, the analog grayscale voltage only charges and discharges the tiny parasitic capacitance of the data lines themselves and cannot penetrate to the liquid crystal capacitor. This voltage jump under a small load generates a weak transient current, which is far from enough to form a high-frequency alternating electromagnetic field, and therefore will not cause electromagnetic coupling interference to the metal casing 100.

[0034] By keeping the source driver chip 370 active, the main controller 310, display driver chip 330, and source driver chip 370 are always connected. When the touch screen 300 is in the open state, the display driver chip 330 only needs to restore the pulse output of the gate drive line 350, and the analog voltage output by the source driver chip 370 to the data line can be quickly charged into the pixel array. This allows the touch screen 300 to fully restore the display image in a very short time, such as within one frame, and the user can hardly see any screen delay or screen tearing after the touch screen 300 is opened. This design, which stops the horizontal scanning pulse output of the gate drive line 350 when the touch screen 300 is closed and keeps the source driver chip 370 active, avoids electromagnetic interference problems and allows the touch screen 300 to respond to the image promptly after the cover is opened. At the same time, it does not cut off the path for the source driver chip 370 to receive image data, avoiding abnormalities in the image data transmission link and improving the stability of the ceiling screen 1000 and the entire vehicle system.

[0035] Please see Figure 3 The touch display screen 300 also includes a backlight driver chip 380 and a backlight module 390. The method further includes: when the touch display screen 300 is in the closed state, the backlight driver chip 380 stops outputting pulse signals to the backlight module 390. When the touch chip 320 determines that the touch display screen 300 is in the closed state, it can send an indication signal to the main controller 310, which then sends a backlight turn-off command to the backlight driver chip 380; or, the touch chip 320 can directly send a backlight turn-off command to the backlight driver chip 380. After receiving the backlight turn-off command, the backlight driver chip 380 shuts down its internal boost converter and PWM generator, stopping the output of PWM pulses and drive current, thereby turning off the LED strips of the backlight module 390.

[0036] This application, after the touch display screen 300 is closed, not only controls the gate drive line 350 to stop outputting horizontal scanning pulses, but also further controls the backlight drive chip 380 to stop outputting pulses to the backlight module 390. This avoids electromagnetic interference caused by the horizontal scanning pulses output by the gate drive line 350 coupling to the housing 100, and also avoids electromagnetic interference caused by the conducted interference generated by the pulses output by the backlight drive chip 380 on the power lines or ground lines coupling to the housing 100. This further eliminates the potential for electromagnetic interference caused by the coupling between the internal electronic components of the touch display screen 300 and the housing 100. Simultaneously, with the touch display screen 300 closed, the backlight module 390 is off, preventing it from generating excessive heat that could cause the anti-vibration pad 200 to fail due to thermal deformation. This extends the lifespan of the ceiling-mounted screen 1000 and ensures the physical safety of the touch display screen 300 when it is opened again and the accuracy of determining the closing state the next time.

[0037] Please see Figure 6 In step S102, the touch chip 320 determines whether the touch display screen 300 is in a closed state based on the values ​​of each touch capacitor 340, including: S201, retrieve the pre-stored capacitor reference value.

[0038] The capacitance reference value represents the inherent capacitance of the touch display screen 300 under conditions of no external force and no proximity. The capacitance reference value can be a fixed value pre-stored within the touch chip 320. Alternatively, the pre-stored capacitance reference value can be the average value obtained by the touch chip 320 after multiple samplings of all touch capacitors 340 on the entire screen when the ceiling-mounted screen 1000 is powered on and the touch display screen 300 is in an open, non-touch state. During normal operation with the touch display screen 300 open, the algorithm within the touch chip 320 dynamically fine-tunes and updates the capacitance reference value based on slow changes in ambient temperature and humidity.

[0039] S202 determines whether the touch display screen is in a closed state based on the values ​​of each touch capacitor and the capacitor reference value.

[0040] After detecting the current value of each touch capacitor 340 in real time, the touch chip 320 calculates the difference between the current value of each touch capacitor 340 and the pre-stored capacitance reference value to obtain the change value of each touch capacitor 340. When a finger touches normally, the change value is usually within the first value range; however, when the touch display screen 300 is closed and presses against the anti-vibration pad 200, the touch capacitors 340 in the surface of the touch display screen 300 are mechanically squeezed, and the change value of the touch capacitors 340 in the pressure area will increase sharply, far exceeding the normal touch range, and falling into the second value range. At this time, it indicates that the touch display screen 300 is in the closed state.

[0041] The base capacitance of the touch capacitor 340 will drift as a whole depending on the environment in which the touch display screen 300 is located. This application determines whether the touch display screen 300 is in a closed state based on the pre-stored capacitance reference value and the current capacitance value of each touch capacitor 340, avoiding judgment errors caused by environmental changes and improving the stability of detecting whether the touch display screen 300 is in a closed state in extreme vehicle environments.

[0042] In some feasible implementations, determining whether the touch display screen 300 is in a closed state based on the values ​​of each touch capacitor 340 and the capacitance reference value includes: calculating the difference between the values ​​of each touch capacitor 340 and the capacitance reference value to obtain the change value of each touch capacitor 340; determining whether the touch display screen 300 is in a closed state based on the change value of each touch capacitor 340 and a first preset threshold; when there are multiple touch capacitors 340 on the touch display screen 300 with change values ​​greater than or equal to the first preset threshold, the touch display screen 300 is in a closed state.

[0043] The first preset threshold is greater than the maximum change produced by normal finger pressure on the touch capacitor 340, but less than the minimum change produced by the shock-absorbing pad 200 pressing against the touch display screen 300. The touch chip 320 calculates the real-time change value of each touch capacitor 340 and compares it with the first preset threshold. Because the hardness of the shock-absorbing pad 200 is greater than that of a human finger, and it is strongly supported by a motor or mechanical hinge when closed, the pressure of the shock-absorbing pad 200 on the touch display screen 300 causes significant microscopic deformation of the touch capacitors 340 within the surface of the touch display screen 300, resulting in a capacitance change value greater than or equal to the first preset threshold. When multiple touch capacitors 340 on the touch display screen 300 show a change value greater than or equal to the first preset threshold, it means that physical pressure from the shock-absorbing pad 200 has been detected, thus determining that the touch display screen 300 is in a closed state. Distinguishing between human touch and pressure from the shock-absorbing pad 200 using the first preset threshold improves the accuracy of determining the closed state of the touch display screen 300.

[0044] The method for determining the first preset threshold may include: during the factory calibration phase of the ceiling-mounted screen 1000, controlling the touch display screen 300 to be closed, so that the anti-vibration pads 200 on the casing 100 press against the touch display screen 300, and recording the change values ​​of each touch capacitor 340 at this time as a first sample set; controlling the touch display screen 300 to be open, using a simulated finger to press the touch display screen 300 with the maximum preset force, and recording the change values ​​of the touch capacitors 340 at this time as a second sample set; comparing the minimum value in the first sample set with the maximum value in the second sample set, and selecting any value within the range between the two as the first preset threshold. This calibration method ensures that the first preset threshold can accurately distinguish between the rigid mechanical pressure of the anti-vibration pads 200 and the normal touch operation of the human body.

[0045] In some feasible implementations, the method further includes determining whether the touch display screen 300 is in a closed state based on the distribution state of multiple touch capacitors 340 whose change values ​​are greater than or equal to a first preset threshold. When the distribution state meets preset conditions, the touch display screen 300 is in a closed state. The preset conditions include: The coordinates of multiple touch capacitors 340 are concentrated in the contact area between the touch display screen 300 and the anti-vibration pad 200. For example, the touch chip 320 internally stores a mapping table of the projection positions of the anti-vibration pad 200 on the touch display screen 300. When a touch capacitor 340 with a change value greater than or equal to a first preset threshold is detected, its coordinate position is extracted. When the coordinates of these touch capacitors 340 fall within the contact area corresponding to the projection mapping table, it is determined that the coordinates of multiple touch capacitors 340 on the touch display screen 300 with a change value greater than or equal to the first preset threshold are concentrated in the contact area between the touch display screen 300 and the anti-vibration pad 200, thus eliminating interference from other areas of the touch display screen 300.

[0046] The touch area corresponding to multiple touch capacitors 340 is greater than a second preset threshold. The touch chip 320 clusters adjacent touch capacitors 340 with a change value greater than or equal to a first preset threshold into a connected region, and calculates the equivalent area of ​​the connected region, such as the number of touch capacitors 340 contained therein or the geometric area. When the area of ​​the connected region is greater than the second preset threshold, it is determined that the multiple touch capacitors 340 on the touch display screen 300 with a change value greater than or equal to the first preset threshold are distributed over a large area. This excludes the situation where the touch display panel is subjected to point-like heavy pressure.

[0047] Within a preset time period, the coordinate positions of the multiple touch capacitive sensors 340 did not slip. The touch chip 320 tracks the centroid coordinates or bounding boxes of the connected components in consecutive scan frames. It calculates the displacement of the centroid coordinates between adjacent frames. If the displacement is less than a small jitter tolerance (e.g., 1 to 2 pixels), it is determined that the coordinate positions of the connected components between adjacent frames have not slipped. This utilizes the physical characteristic of the shock-absorbing pad 200 remaining stationary after being closed, eliminating interference from the user sliding their finger along the screen edge.

[0048] Within a preset time period, no coordinate changes matching the click frequency are reported for the coordinate positions of multiple touch capacitors 340. The touch chip 320 monitors the duration from the appearance to disappearance, or from being greater than or equal to the first threshold to being less than the first threshold, of touch capacitors 340 on the touch display screen 300, as well as the frequency of such state transitions. Since the pressure from the anti-vibration pad 200 is continuous, high-frequency clicks on the touch display screen 300 will not occur. If no coordinate changes matching the human click frequency are detected within the preset time period, interference from user clicks on the touch display screen 300 is ruled out.

[0049] When the distribution of multiple touch capacitors 340 whose change value on the touch display screen 300 is greater than or equal to the first preset threshold simultaneously meets the above four preset conditions, the touch display screen 300 is determined to be in the closed state. This eliminates interference from situations such as accidental touches by the palm on unusual areas of the touch display screen 300, interference from situations such as point-like heavy pressure on the touch display screen 300, and interference from situations such as user sliding or clicking on the touch display screen 300. This reduces accidental touches caused by human operation and improves the accuracy of judging the closed state of the touch display screen 300.

[0050] In some feasible implementations, the coordinate positions of multiple touch capacitors 340 do not slide shift within a preset time. The judgment process includes: obtaining the coordinates of multiple touch capacitors 340; calculating the displacement distance between the current coordinate and the previous coordinate of each touch capacitor 340; if the displacement distance is less than a third preset threshold within the preset time, then the coordinate positions of multiple touch capacitors 340 do not slide shift.

[0051] The third preset threshold is used to represent the allowable coordinate jitter tolerance of the touch display screen 300, such as the physical spacing between one or two touch capacitors 340, specifically determined according to the type of touch display screen 300. The touch chip 320 periodically scans the touch display screen 300 at a fixed frequency. In each frame scan, the coordinate values ​​of multiple touch capacitors 340 whose change value is greater than or equal to the first preset threshold are recorded, and the difference between the coordinates of each touch capacitor 340 in the current frame and the coordinates of each touch capacitor 340 in the previous frame is calculated. If, within a preset time, such as within a series of frames, the displacement distance between each adjacent frame of the touch capacitor 340 is less than the third preset threshold, it indicates that the pressure area between the touch display screen 300 and the anti-vibration pad 200 only experiences noise-level jitter, and the coordinate positions of the multiple touch capacitors 340 have not shifted. By calculating the displacement distance of the touch capacitors 340 between adjacent frames, continuous large-scale shifts in coordinates when a finger slides can be accurately captured, thereby improving the accuracy of excluding user sliding of the touch display screen 300.

[0052] In some feasible implementations, if the coordinate positions of multiple touch capacitors 340 do not show any coordinate changes that match the click frequency within a preset time period, the determination process includes: determining whether multiple touch capacitors 340 generate a lift-off event; if the change value of the touch capacitor 340 drops from greater than a first preset threshold to less than a first preset threshold, then the touch capacitor 340 generates a lift-off event; if no lift-off event is detected within the preset time period, or the frequency of detected lift-off events is lower than a fourth preset threshold, then the coordinate positions of multiple touch capacitors 340 do not show any coordinate changes that match the click frequency.

[0053] Among the multiple touch capacitors 340 on the touch display screen 300 whose change value is greater than or equal to a first preset threshold, when the change value of a certain touch capacitor 340 falls back from greater than or equal to the first preset threshold to the first preset threshold, it is determined that the touch capacitor 340 has experienced a lift-off event. The touch chip 320 counts the number of lift-off events within a preset time to calculate the frequency of lift-off events. A fourth preset threshold is used to distinguish between static pressure of the anti-vibration pad 200 on the touch display screen 300 and dynamic human clicks on the touch display screen 300. For example, the fastest human tapping operation (such as double-clicking) frequency is usually between 2 and 4 Hz, so the fourth preset threshold can be set to 1 Hz or 2 Hz. If the touch chip 320 does not detect any lift-off event of a touch capacitor 340, it indicates that the touch display screen 300 is in contact with the anti-vibration pad 200 and is in a closed state. Alternatively, if the touch chip 320 detects a lift-off event from the touch capacitor 340, but the number of lift-off events is less than the fourth preset threshold, it indicates that this lift-off event was not caused by a human dynamic click on the touch display screen 300, and the touch display screen 300 can still be considered to be in a closed state. By detecting the occurrence and frequency of lift-off events and whether they reach the fourth preset threshold, the accuracy of determining the closed state of the touch display screen 300 is improved, avoiding the problem of normal user operation being mistakenly interpreted as closed, causing the touch display screen 300 to stop refreshing the display or go black.

[0054] In some feasible implementations, after determining that the touch display screen 300 is in a closed state, the method further includes: real-time detection of the change values ​​of each touch capacitor 340 on the touch display screen 300 by the touch chip 320; when the change values ​​of each touch capacitor 340 are all less than a first preset threshold, it is determined that the touch display screen 300 is in an open state, the touch chip 320 resumes reporting the touch signal of the touch display screen 300 to the main controller 310, and the display driver chip 330 controls the gate drive line 350 to re-output pulses to the pixel matrix 360 so that the touch display screen 300 resumes refreshing the display screen.

[0055] When the touchscreen is closed, the touch chip 320 continuously monitors the changes in the values ​​of each touch capacitor 340 at a low or normal frequency. When the changes in the values ​​of all touch capacitors 340 are less than a first preset threshold, it means that the mechanical pressure of the anti-vibration pad 200 on the touchscreen display 300 has disappeared, thus determining that the touchscreen display 300 is in an open state. After determining that the touchscreen display 300 is open, the touch chip 320 resumes reporting touch signals to the main controller 310; at the same time, the touch chip 320 or the main controller 310 sends a wake-up instruction to the display driver chip 330. After receiving the instruction, the display driver chip 330 controls the timing controller to output a start signal and a shift clock signal to the gate driver chip again, so as to control the gate driver line 350 to turn on the thin-film transistor switches row by row. During the period when the touchscreen display 300 is closed, the source driver chip 370 continuously receives image data, and the data line of the pixel matrix 360 maintains the analog grayscale voltage of the latest frame. When the touch display 300 is opened, the gate drive circuit 350 only needs to output a line scan pulse to turn on the thin-film transistor switch, and the analog grayscale voltage prepared on the data line is charged into the pixel matrix 360. Without any data reconnection and reload process, the picture is restored in a very short time (one to two frame cycles), which improves the smoothness of the display and the human-computer interaction experience of the in-vehicle ceiling screen 1000.

[0056] Please see Figure 7 , Figure 7 This is a schematic diagram of a control device for a ceiling-mounted screen provided in an embodiment of this application. The control device can be a server, or a device or component within a server, or a computer program, etc. Alternatively, the control device can be the ceiling-mounted screen 1000, or a device or component within the ceiling-mounted screen 1000, or a computer program, etc. Figure 7 As shown, the control device includes a processor 401, a communication interface 402, and a memory 403. The processor 401, the communication interface 402, and the memory 403 can be interconnected via a bus 404 or in other ways.

[0057] The processor 401 includes one or more processors, such as one or more central processing units (CPUs). When the processor 401 is a CPU, the CPU can be a single-core CPU or a multi-core CPU. In this embodiment, the processor 401 is used to control the ceiling-mounted screen. Figure 4 The example shown.

[0058] The memory 403 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or compact disc read-only memory (CD-ROM), and is used to store related instructions and data.

[0059] Communication interface 402 is used to enable communication with other devices. For example, the server's communication interface is used to enable communication with the ceiling-mounted screen 1000, and the ceiling-mounted screen 1000's communication interface is used to enable communication with the server. In this embodiment, memory 403 stores computer-readable instructions 405, and processor 401 is used to call the instructions stored in memory 403. When the control device is a server, the above instructions are used to perform the following steps: (1) Real-time detection of the values ​​of each touch capacitor on the touch screen via the touch chip; (2) The touch chip determines whether the touch display screen is in the closed state based on the value of each touch capacitor. If the touch display screen is in the closed state, an indication signal is generated and sent to the display driver chip; if the touch display screen is in the open state, the touch signal of the touch display screen is reported to the main controller. (3) When the touch screen is closed, the display driver chip controls the gate drive circuit to stop outputting pulses to the pixel matrix so that the touch screen stops refreshing the display screen.

[0060] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0061] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a ceiling-mounted screen, characterized in that, The ceiling-mounted screen includes a housing, a shock-absorbing pad, and a touch display screen. The housing is equipped with a wiring harness, the shock-absorbing pad is embedded in the housing, and the touch display screen rotates relative to the housing. The touch display screen contains a main controller, a touch chip, a display driver chip, a touch capacitor, a gate drive circuit, and a pixel matrix. The method includes: The touch chip detects the values ​​of each touch capacitor on the touch display screen in real time. The touch chip determines whether the touch display is in a closed state based on the values ​​of each touch capacitor. If the touch display is in a closed state, an indication signal is generated and sent to the display driver chip. If the touch display is in an open state, the touch signal of the touch display is reported to the main controller. When the touch display is in a closed state, the light-emitting surface of the touch display is attached to the housing and in contact with the anti-vibration pad, and the pulse output by the gate drive circuit is coupled to the housing. When the touch screen is closed, the display driver chip controls the gate drive line to stop outputting pulses to the pixel matrix so that the touch screen stops refreshing the display screen.

2. The control method as described in claim 1, characterized in that, The touch display screen also includes a source driver chip, and the method further includes: the source driver chip remains active in both the closed and uncovered states of the touch display screen, and the active state includes, but is not limited to: The source driver chip continuously receives image data; The source driver chip continuously outputs analog grayscale voltage to the data lines corresponding to the pixel matrix.

3. The control method as described in claim 1, characterized in that, The touch display screen also includes a backlight driver chip and a backlight module, and the method further includes: When the touch display screen is closed, the backlight driver chip stops outputting pulse signals to the backlight module.

4. The control method according to any one of claims 1-3, characterized in that, The step of determining whether the touch display screen is in a closed state based on the values ​​of each touch capacitor by the touch chip includes: Retrieve the pre-stored capacitor reference value; The value of each touch capacitor and the reference capacitance value determine whether the touch display screen is in a closed state.

5. The control method as described in claim 4, characterized in that, The step of determining whether the touch display screen is in a closed state based on the values ​​of each touch capacitor and the capacitance reference value includes: The change value of each touch capacitor is obtained by calculating the difference between the value of each touch capacitor and the reference value of the capacitor; The touch display screen is in a closed state when the change value of each touch capacitor is determined based on the first preset threshold. When there are multiple touch capacitors on the touch display screen with a change value greater than or equal to the first preset threshold, the touch display screen is in a closed state.

6. The control method as described in claim 5, characterized in that, The method further includes determining whether the touch display screen is in a closed state based on the distribution state of multiple touch capacitors on the touch display screen whose change value is greater than or equal to a first preset threshold; when the distribution state meets the preset conditions, the touch display screen is in a closed state. The preset conditions include: The coordinates of the plurality of touch capacitive sensors are concentrated in the contact area between the touch display screen and the shock-absorbing pad; and, The touch area corresponding to the plurality of touch capacitive sensors is greater than a second preset threshold; and, Within a preset time period, the coordinate positions of the plurality of touch capacitors did not slip or shift; and, Within a preset time period, the coordinate positions of the multiple touch capacitives do not show any coordinate changes that correspond to the click frequency.

7. The control method as described in claim 6, characterized in that, The determination process for ensuring that the coordinate positions of the plurality of touch capacitive devices do not shift within a preset time period includes: Obtain the coordinates of the plurality of touch capacitors; Calculate the displacement distance between the current coordinates and the previous coordinates of each of the touch capacitors. If the displacement distance is less than a third preset threshold within a preset time, then the coordinate positions of the multiple touch capacitors have not shifted.

8. The control method as described in claim 6, characterized in that, If, within a preset time period, the coordinate positions of the plurality of touch capacitive devices do not show any coordinate changes consistent with the click frequency, the determination process includes: Determine whether the plurality of touch capacitors have generated a lift-off event. If the change value of the touch capacitor drops from greater than a first preset threshold to less than a first preset threshold, then the touch capacitor has generated a lift-off event. If no lift-off event is detected within the preset time period, or if the frequency of the lift-off event is lower than the fourth preset threshold, then the coordinate positions of the multiple touch capacitors do not show any coordinate changes that match the click frequency.

9. The control method as described in claim 5, characterized in that, After determining that the touch display screen is in the closed state, the method further includes: The touch chip detects the changes in the values ​​of each touch capacitor on the touch display screen in real time. When the change values ​​of each of the touch capacitors are less than the first preset threshold, it is determined that the touch display screen is in an open state. The touch chip resumes reporting the touch signal of the touch display screen to the main controller, and the display driver chip controls the gate drive line to output pulses to the pixel matrix again so that the touch display screen resumes refreshing the display screen.

10. A control device for a ceiling-mounted screen, characterized in that, include: A memory and a processor, the memory storing computer-executable instructions, the processor executing the computer-executable instructions stored in the memory, causing the processor to perform the control method as described in any one of claims 1-9.

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