Electronic device

Abstract

The invention relates to an electronic device. The electronic device comprises a display unit, a display driving circuit and a circuit assembly, the display driving circuit is coupled to the display unit, the display driving circuit can drive the display unit to display a picture in a plurality of update rate modes, and the plurality of update rate modes comprise a first update rate and a second update rate. The circuit assembly is arranged under a display area of the display unit, the circuit assembly is coupled to the display driving circuit and receives a dynamic updating signal generated by the display driving circuit, and the dynamic updating signal comprises a plurality of starting pulse waves and a plurality of delay pulse waves. Therefore, the problem that in the prior art, when the update rate of the screen is changed, mutual interference between the display pixels and the under-screen circuit assembly cannot be really avoided can be solved.

Description

Technical Field

[0001] The present invention relates to an electronic device, and more particularly to an electronic device in which a circuit component is disposed under a screen. Background Art

[0002] In today's consumer electronics (e.g., smartphones and tablets), manufacturers are striving to maximize screen size by moving circuit components previously located within the screen's bezel to the underside of the display area. This reduces the area previously occupied by these components and further reduces the bezel's size. This allows electronic products to have larger screens within a given form factor, achieving a better screen-to-body ratio. Currently, circuit components that can be relocated to the underside of the screen include lenses, fingerprint sensors, and various light sensors.

[0003] However, the display pixels of the screen and the circuit components installed under the screen may interact with each other. For example, the lens under the screen may receive the light emitted by the display pixels, causing image distortion. Conversely, when circuit components with light emitters (such as distance sensors, time-of-flight range finders, and dot projectors) are installed under the screen, the invisible light emitted may still affect the screen imaging, easily causing bright spots on the screen. Various manufacturers have proposed many different technical means to solve the problem of mutual interference between display pixels and circuit components under the screen, such as solutions that control the circuit components under the screen to not operate when the display pixels are emitting light, and solutions that control the display pixels to not emit light when the circuit components under the screen are activated.

[0004] As display technology advances toward higher screen resolutions and higher refresh rates, along with improvements in system computing and communication performance, the power consumption of electronic devices will increase. Given limited battery capacity, some industry players have proposed dynamically adjusting the screen refresh rate to reduce overall power consumption. For example, the screen refresh rate can be controlled to be above 120Hz for gaming, 60Hz for video playback, and 1Hz to 30Hz for static images.

[0005] Fluctuations in the screen's refresh rate make it difficult for electronic devices to accurately determine when display pixels should illuminate relative to their underlying circuitry. This renders many existing solutions for preventing interference between display pixels and the underlying circuitry ineffective. One existing approach involves providing the display panel's refresh rate information to the underlying circuitry via an additional pin, but this approach significantly increases overall system cost.

[0006] On the other hand, the applicant previously filed a patent application in China with the publication number CN116798350A, which describes a method of integrating the refresh rate information of the display panel into a dynamic refresh signal generated by a display driver circuit, and then decoding the refresh rate information by a circuit component under the screen and controlling the operation of the circuit component based on the refresh rate information. The applicant now proposes further improvements to this technology. Summary of the Invention

[0007] One purpose of the present invention is to provide an electronic device that allows an under-screen circuit component to receive a dynamic update signal generated by a display driver circuit. The dynamic update signal includes multiple start pulses and delay pulses. When the circuit component is controlled by the dynamic update signal, the actuation of the component can be controlled to cooperate with the display driver circuit to effectively avoid interference between the display pixels and the under-screen circuit component, thereby solving the problem of failure of the prior art when the screen refresh rate changes.

[0008] The present invention discloses an electronic device comprising a display unit, a display driving circuit, and a circuit component. The display driving circuit is coupled to the display unit and is capable of driving the display unit to display an image in a refresh rate mode, wherein the refresh rate mode comprises a first refresh rate and a second refresh rate. The circuit component is disposed under a display area of the display unit, the circuit component is coupled to the display driving circuit, and receives a dynamic update signal generated by the display driving circuit, wherein the dynamic update signal comprises a start pulse and a delay pulse. In the dynamic update signal, the start pulse represents the time point at which the display driving circuit controls the refresh of the display unit; the delay pulse comprises a first delay pulse corresponding to the first refresh rate and a second delay pulse corresponding to the second refresh rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG2 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

[0010] Figure 2 FIG2 is a schematic diagram showing a dynamic update signal of an electronic device according to a preferred embodiment of the present invention;

[0011] Figure 3 FIG2 is a schematic diagram showing the structure of a circuit component of an electronic device according to an embodiment of the present invention;

[0012] Figure 4 A schematic diagram showing a variation of the implementation of the dynamic update signal of the electronic device embodiment of the present invention; and

[0013] Figure 5 FIG. 1 is a schematic diagram showing another variation of the implementation of the dynamic update signal of the electronic device according to the embodiment of the present invention.

[0014] Description of the accompanying symbols:

[0015] 1. Electronic devices;

[0016] 12. Display driver circuit;

[0017] 14. Circuit components;

[0018] 142. Light-emitting unit;

[0019] 144. Sensing unit;

[0020] 146. Control circuit;

[0021] 16. Display unit;

[0022] 20. Substrate;

[0023] 202, transmission unit;

[0024] 22. Processing unit;

[0025] A. Display area;

[0026] A1, local display area;

[0027] B. Border area;

[0028] SS, dynamic update signal;

[0029] DS, sensor signal;

[0030] R1, sensing light;

[0031] R2, reflected light;

[0032] LD, light drive signal;

[0033] SD, sensor drive signal; S1, data synchronization signal; S2, display synchronization signal; SS, dynamic update signal; SS', dynamic update signal;

[0034] P, initial pulse wave;

[0035] D1, first delayed pulse;

[0036] D2, second delayed pulse;

[0037] T, time point;

[0038] T', time point. DETAILED DESCRIPTION

[0039] To help you, the review committee, gain a deeper understanding of the features and effects of the present invention, we would like to provide examples and accompanying explanations as follows:

[0040] Certain terms are used in the specification and claims to refer to specific components. However, those with ordinary skill in the art of the present invention should understand that different terms may be used to refer to the same component. Moreover, this specification and claims do not distinguish components based on differences in name, but rather on differences in the overall technology of the components. The terms "including," "having," and "having" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to." Furthermore, the term "coupled" includes both direct and indirect connection methods. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be directly connected to the second device, or can be indirectly connected to the second device through other devices or other devices, so that signals can be transmitted between the first and second devices.

[0041] The following further describes the characteristics and structures of the electronic device and its circuit components disclosed in the present invention using different embodiments:

[0042] First, see Figure 1 The figure shows a schematic diagram of the structure of an embodiment of an electronic device of the present invention. As shown in the figure, the electronic device 1 of the present invention includes a display driving circuit 12, a circuit component 14 and a display unit 16. In this embodiment, the circuit component 14 includes a light-emitting unit 142, a sensing unit 144 and a control circuit 146. The control circuit 146 is coupled to the light-emitting unit 142 and the sensing unit 144 respectively. The display unit 16 can include a display panel such as a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display, and the display unit 16 can generally also integrate a touch circuit that provides a touch function. The light-emitting unit 142 and the sensing unit 144 included in the circuit component 14 are arranged under a display area A of the display unit 16. Therefore, the circuit component 14 of this embodiment is an under-screen design. In this embodiment, the light emitting unit 142 and the sensing unit 144 can be integrated with the control circuit 146 into an integrated circuit chip. However, the present invention is not limited thereto. The light emitting unit 142 and the sensing unit 144 can be respectively disposed at different positions below the display area A and coupled to the control circuit 146. The so-called display area A refers to the area of the display unit 16 having effective display pixels, which can be used to display images and is not blocked by a frame area B of the electronic device.

[0043] This embodiment uses a circuit component 14 having a light-emitting unit 142, a sensing unit 144, and a control circuit 146 as an example. The circuit components 14 can be used to form various sensing components such as a proximity sensor, a time of flight sensor, and a dot projector. However, the reason for using these circuit components 14 for illustration is that the light-emitting unit 142 contained therein may affect the screen imaging, resulting in how to avoid mutual interference between the display pixels of the display unit 16 and the light-emitting unit 142 becoming crucial. Compared to circuit components such as lenses, fingerprint sensors, and ambient light sensors that are usually only unilaterally affected by the light emitted by the screen, it is easier to fully explain the various technical effects brought about by the improvements of the present invention using the circuit components 14.

[0044] Continuing from the above, the circuit component 14 of this embodiment is further coupled to a display driver circuit 12, and the display driver circuit 12 is coupled to the display unit 16. In detail, the display driver circuit 12 can be coupled to the control circuit 146 of the circuit component 14 via a transmission unit 202. The transmission unit 202 can be a flat cable or other electrical connection structure. The transmission unit 202 and the circuit component 14 can be arranged on a substrate 20. The substrate 20 can be a motherboard of an electronic product such as a mobile phone, but the present invention is not limited to this. The display driver circuit 12 is generally composed of one or more independent integrated circuit chips, which are responsible for controlling the drive timing, drive voltage and display data access of the display unit 16, so that the display unit 16 can be correctly driven to display the screen.

[0045] The display driver circuit 12 generates a dynamic refresh signal SS, which may include information about the refresh rate (i.e., refresh frequency) of the display unit 16. In this embodiment, the display driver circuit 12 outputs the dynamic refresh signal SS to the control circuit 146 of the circuit assembly 14. It is worth noting that in actual commercially available products, the display driver circuit 12 and the circuit assembly 14 are often designed and manufactured by different manufacturers. Therefore, if the technology of the present invention is to gain greater market acceptance, it is necessary to reduce the design difficulty of both the display driver circuit 12 and the circuit assembly 14.

[0046] Therefore, for the display driving circuit 12, this embodiment adopts a technical solution that easily integrates the refresh rate of the display unit 16 into the dynamic refresh signal SS. For details, please refer to Figure 2The signal diagram shown is shown. Wherein S1 is a synchronization signal of display data (hereinafter referred to as data synchronization signal), for example, a vertical synchronization signal. Assuming that in the environment where the display driving circuit 12 is located, the display data is fixedly updated at a frequency of 120Hz for one frame, the frequency of the data synchronization signal S1 can be fixed to 120Hz. However, in order to provide the function of dynamically adjusting the refresh rate of the display unit 16, the display driving circuit 12 uses a synchronization signal S2 (hereinafter referred to as display synchronization signal) for display control. The frequency is not fixed to 120Hz. For example, as shown in the figure, it includes three modes such as 120Hz, 60Hz and 30Hz. The display synchronization signal S2 can be a tearing effect (TE) signal, a scan line synchronization signal or other synchronization signal used for display control. Note that the three modes of 120Hz, 60Hz and 30Hz are only examples given for the purpose of illustration of the present invention, and the present invention is not limited thereto.

[0047] The dynamic update signal SS includes multiple start pulses P and multiple delay pulses D1 and D2. The start pulse P represents the point in time when the display driver circuit 12 actually controls the display unit 16 to begin refreshing and can be synchronized with the display synchronization signal S2. Delay pulses D1 and D2 are inserted when the display driver circuit 12 controls the display unit 16 to pause refreshing in order to reduce the refresh rate. When the display synchronization signal S2 is 120 Hz, the dynamic update signal SS may not include a delay pulse. When the display synchronization signal S2 is 60 Hz, the dynamic update signal SS may include a shorter first delay pulse D1 in the second half. When the display synchronization signal S2 is 30 Hz, the dynamic update signal SS may include a longer second delay pulse D2 in the last three-quarters.

[0048] Through the above preferred embodiments of the present invention, the technical effect of reducing the design difficulty of both the display driver circuit 12 and the circuit component 14 can be achieved, as detailed below:

[0049] For the display driver circuit 12, the data synchronization signal S1, the display synchronization signal S2, and the refresh rate information of the display unit 16 are all existing signals. Therefore, it is easy to infer the timing at which the display driver circuit 12 controls the display unit 16 to pause updating in order to reduce the refresh rate. This allows the display driver circuit 12 to generate the dynamic update signal SS with the inserted delayed pulses D1 and D2, without requiring any special signal processing. Furthermore, the delayed pulses D1 and D2 do not require additional circuitry. For example, a system typically has a clock signal C with a relatively high frequency (e.g., 360 Hz). Therefore, the display driver circuit 12 can directly use segments of the existing clock signal C as the delayed pulses D1 and D2. In other words, the display driver circuit 12 can generate the dynamic update signal SS required by the preferred embodiment of the present invention through a simple design.

[0050] On the other hand, for the circuit element 14, after receiving the dynamic update signal SS, the circuit element 14 does not need to decode the dynamic update signal SS to control the operation of other components to cooperate with the display driving circuit 12. Figure 1 、 Figure 2 As shown, since the circuit assembly 14 is fixed in position within the electronic device 1, when the light-emitting unit 142 is positioned below the display unit 16, the sensing light R1 it emits will only affect one or several rows of display pixels within a local display area on the display unit 16. Therefore, by simply controlling the light-emitting unit 142 to activate at a specific time, the display pixels in the local display area A1 can be prevented from emitting light, thereby preventing interference with the display unit 16 and causing bright spots or flickering. For example, if the light-emitting unit 142 needs to be activated only after the local display area A1 is enabled, at a 120Hz refresh rate, a default duration can be calculated based on the position of the start pulse P in the dynamic update signal SS. By repeatedly activating the light-emitting unit 142 at the same 120Hz frequency, the light-emitting unit 142 can be controlled to activate at the appropriate time.

[0051] When the refresh rate of the display unit 16 is dynamically adjusted, for example, to 60 Hz, if no processing is performed, the light-emitting unit 142 will be activated twice in a single display update, which may affect the screen imaging. However, because the dynamic update signal SS is inserted with a shorter first delay pulse D1 when the refresh rate is adjusted to 60 Hz, the first delay pulse D1 can be used to prevent the light-emitting unit 142 from being activated at the original time point T ( Figure 2 The dashed box here indicates that the original activation of the light-emitting unit 142 has been suspended. This ensures that the circuit element 14 does not activate twice during a single display update when controlled by the dynamic update signal SS. Similarly, if the refresh rate of the display unit 16 is adjusted to 30 Hz, without any processing, the light-emitting unit 142 will activate four times during a single display update. However, because the dynamic update signal SS inserts a longer second delay pulse D2 at this time, the circuit element 14 does not activate four times during a single display update when controlled by the dynamic update signal SS.

[0052] It should be noted that, in fact, when the circuit component 14 is controlled by the dynamic update signal SS, it is not necessary to decode the dynamic update signal SS to confirm the current update rate of the display unit 16. In order to control the operation of the light-emitting unit 142 to cooperate with the display driver circuit 12, this greatly simplifies the design difficulty of the circuit component 14 and significantly reduces the control delay, making the present invention particularly suitable for applications in products where the screen refresh rate needs to be continuously changed.

[0053] As described above, in this embodiment, the circuit components 14 include the light emitting unit 142, so that the circuit components 14 can be used to form various sensing components such as distance sensors, time-of-flight ranging sensors, and dot projectors. The following takes a distance sensor as an example to illustrate the operation of the circuit component 14 after receiving the dynamic update signal SS. Figure 3 As shown, the circuit assembly 14 may include a light drive signal LD and a sensing drive signal SD. The control circuit 146 receives a dynamic update signal SS and controls the operation of the light-emitting unit 142 based on the dynamic update signal SS. When the light-emitting unit 142 needs to be activated, the control circuit 146 generates the light drive signal LD and transmits it to the light-emitting unit 142, driving the light-emitting unit 142 to emit sensing light R1. Simultaneously, in this embodiment, the control circuit 146 may further generate the sensing drive signal SD and transmit it to the sensing unit 144, driving the sensing unit 144 to sense a reflected light R2 of the sensing light R1. Furthermore, in some embodiments of the present invention, the sensing unit 144 continuously senses light without stopping, so the control circuit 146 may only use the light drive signal LD to drive the light-emitting unit 142. The light-emitting unit 142 may be a light-emitting diode (LED) or a laser diode (LD). In typical distance sensing operations, the sensing light R1 is primarily invisible light, such as infrared light.

[0054] In addition, if Figure 1 The circuit component 14 transmits a sensing signal DS generated by the sensing unit 144 to a processing unit 22 on the substrate 20. The processing unit 22 can determine whether the display unit 16 is close to an object or a human body based on the sensing signal DS provided by the sensing unit 144, and further determine whether to disable the touch function and display function of the display unit 16.

[0055] Through the above-mentioned embodiment, the present invention allows the circuit component 14 to cooperate with the display driving circuit 12, so that no matter what the current refresh rate of the display unit 16 is, the circuit component 14 can control the light-emitting unit 142 to activate a default number of times in a single display update, thereby preventing the sensing light R1 of the light-emitting unit 142 from interfering with the normal display color of the display pixel, ensuring that it is unlikely to cause the display unit 16 to form bright spots or flicker.

[0056] The following describes various variations of the above preferred embodiments of the present invention:

[0057] Please continue to refer to Figure 2As shown, based on the teachings of the present invention, one skilled in the art may attempt to combine the aforementioned delayed pulses D1 and D2 with the immediately following start pulse P into a single pulse to form another form of dynamic update signal SS. This can further simplify the design of both the driver circuit 12 and the circuit element 14. However, the single pulse is still essentially composed of the delayed pulses D1 and D2 inserted at the point in time when the display driver circuit 12 controls the display unit 16 to pause updating in order to reduce the refresh rate, and the subsequent start pulse P, and thus does not depart from the scope of the present invention.

[0058] Although in the aforementioned embodiment, when the circuit element 14 is controlled by the dynamic update signal SS, it is not necessary to decode the dynamic update signal SS to confirm the current update rate of the display unit 16, and the operation of the light-emitting unit 142 can be controlled to cooperate with the display driving circuit 12. Figure 4 As shown, if one of ordinary skill in the art is willing to incur the circuit cost of decoding the dynamic update signal SS and tolerate the disadvantage of a control delay, he or she may still refer to the technical content disclosed in the applicant's previous Chinese patent application No. CN116798350A. By decoding the dynamic update signal SS (for example, determining that no delayed pulse is inserted, indicating 120 Hz; determining that the shorter first delayed pulse D1 is inserted, indicating 60 Hz; or determining that the longer second delayed pulse D2 is inserted, indicating 30 Hz), the current refresh rate of the display unit 16 can be determined. Then, based on the real-time refresh rate information, a specific time period can be calculated from the position of the starting pulse P in the dynamic update signal SS to obtain the most suitable time point T' for controlling the activation of the light-emitting unit 142 under various modes such as 120 Hz, 60 Hz, and 30 Hz. Although the applicant has also marked the same time points T' in the display synchronization signal S2, those skilled in the art will understand that in order to control the operation of the light-emitting unit 142 at these time points T' based on the display synchronization signal S2, it is necessary to obtain the refresh rate information of the display panel and perform corresponding signal processing.

[0059] It is worth noting that even in Figure 4 The variation shown still has the advantage of allowing the display driver circuit 12 to generate the dynamic update signal SS with the inserted delay pulses D1 and D2 without performing any special signal processing. This allows the display driver circuit 12 to generate the dynamic update signal SS required by the above variation implementation of the present invention through a simple design.

[0060] Furthermore, although the delayed pulses D1 and D2 are inserted at the point when the display driving circuit 12 controls the display unit 16 to suspend updating in order to reduce the refresh rate in the aforementioned embodiments and variations, those skilled in the art may also try to adopt other simple variations to generate different forms of dynamic update signals SS based on the teachings of the present invention, in an attempt to achieve the same or similar technical effects. For example, please refer to Figure 5 As shown, those skilled in the art can attempt to insert delayed pulses D1 and D2 adjacent to the start pulse P. Although this approach may require additional signal processing steps in the display driver circuit 12, resulting in incurred costs, the dynamic update signal SS generated by inserting different delayed pulses D1 and D2 adjacent to the start pulse P can still timely control the circuit component 14. This effectively prevents the light-emitting unit 142 from activating at incorrect times, regardless of whether the update rate of the dynamic update signal SS is adjusted to 60 Hz or 30 Hz. This ensures that the light-emitting unit 142 only activates a default number of times during a single display update. Furthermore, in circuit systems with slower processing speeds, this variation can provide the circuit component 14 with more time to effectively prevent the light-emitting unit 142 from activating at incorrect times.

[0061] The difference between the different delayed pulses D1 and D2 may refer to the difference in the number of pulses (e.g. Figure 5 The delayed pulses D1 and D2 shown have 1 and 2 pulses respectively, or have different pulse durations, but the present invention is not limited thereto.

[0062] As mentioned above, in other embodiments of the present invention, the circuit component 14 may also be a lens (image sensor), a fingerprint sensor, or other various application components. However, even if the circuit component 14 does not have the light-emitting unit 142, the dynamic update signal SS can still be used to determine the current refresh rate of the display unit 16, thereby allowing the circuit component 14 to correspond to or avoid the display pixel light-emitting time of the display unit 16.

[0063] To highlight the outstanding effects of the various embodiments of the present invention, the following describes an example of a commercially available product that dynamically adjusts the image refresh rate. In products advertised as having adaptive features, to avoid flickering that would be noticeable to the human eye during the image refresh rate adjustment process, they generally make an adaptive, gradual adjustment between the initial refresh rate and the target refresh rate. For example, if the refresh rate of the display unit 16 needs to be reduced from 120Hz to 1Hz, the display unit 16 may be gradually adjusted in the order of 120Hz, 90Hz, 60Hz, 30Hz, and 1Hz over a very short period of time. In this case, if the preferred embodiment of the present invention is adopted to allow the display driver circuit 12 to output the dynamic update signal SS to the circuit component 14, and the circuit component 14 does not decode the dynamic update signal SS to confirm the current update rate of the display unit 16, but directly uses it to control the actuation of the component (for example, the light-emitting unit 142) to cooperate with the display driver circuit 12, this can significantly reduce the control delay, so that when the update rate changes in a very short time, the circuit component 14 can cooperate with the current picture update rate in real time to ensure that it is actuated at the appropriate time.

[0064] In summary, the present invention provides an electronic device that, by enabling an under-display circuit component to receive a dynamic update signal generated by a display driver circuit, comprising multiple start pulses and multiple delay pulses, controls the circuit component's operation in coordination with the display driver circuit when controlled by the dynamic update signal, thereby effectively preventing interference between display pixels and the under-display circuit component. In particular, when the under-display circuit component includes a light-emitting unit, this prevents the light emitted by the light-emitting unit from interfering with the normal display color of the display pixels, thereby minimizing the risk of bright spots or flickering on the display panel.

[0065] Furthermore, the display driving circuit of the present invention can generate the dynamic update signal required by the present invention through a simple design, and can also simplify the design difficulty of the circuit components, and even reduce the control delay of the circuit, which can effectively avoid the mutual interference between the display pixels and the circuit components under the screen.

[0066] Therefore, this invention is novel, progressive, and industrially applicable, and should undoubtedly meet the patent application requirements of the Patent Law. Therefore, I have filed an invention patent application in accordance with the law and pray that the patent office will be approved as soon as possible. I am deeply grateful.

[0067] However, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications based on the shape, structure, characteristics and spirit described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An electronic device, characterized in that: It includes: a display unit; a display driving circuit coupled to the display unit, capable of driving the display unit to display images at multiple refresh rate modes, the multiple refresh rate modes including a first refresh rate and a second refresh rate; a circuit component disposed under a display area of the display unit, the circuit component being coupled to the display driving circuit and receiving a dynamic update signal generated by the display driving circuit, the dynamic update signal comprising a plurality of start pulses and a plurality of delay pulses; Among them, in the dynamic update signal, the start pulse represents the time point when the display driving circuit controls the display unit to refresh; the delayed pulse includes a first delayed pulse corresponding to the first update rate and a second delayed pulse corresponding to the second update rate.

2. The electronic device according to claim 1, wherein: At the first update rate, the first delay pulse is inserted between two adjacent start pulses to control the display driver circuit to suspend updating of the display unit; at the second update rate, the second delay pulse is inserted between two adjacent start pulses to control the display driver circuit to suspend updating of the display unit.

3. The electronic device according to claim 2, wherein: The multiple update rate modes include a third update rate that is higher than the first update rate and the second update rate. Under the third update rate, the delayed pulse is not inserted between two adjacent start pulses.

4. The electronic device according to claim 3, wherein: Under the third update rate, the dynamic update signal controls the circuit component to repeatedly operate at a frequency of the third update rate.

5. The electronic device according to claim 4, wherein: Under the first update rate, the first delay pulse is used to prevent the circuit component from being activated at one time point; under the second update rate, the first delay pulse is used to prevent the circuit component from being activated at multiple time points.

6. The electronic device according to claim 1, wherein: The dynamic update signal includes update rate information of the display unit. When the circuit component is controlled by the dynamic update signal, the circuit component does not decode the dynamic update signal to obtain the update rate information.

7. The electronic device according to claim 2, wherein: The first delayed pulse and the second delayed pulse are formed by the display driving circuit using segments of a clock signal, and the frequency of the clock signal is greater than the first refresh rate and the second refresh rate.

8. The electronic device according to claim 2, wherein: The first delayed pulse and an immediately following initial pulse are combined into a single pulse; the second delayed pulse and another immediately following initial pulse are combined into a single pulse.

9. The electronic device according to claim 1, wherein: The dynamic update signal includes update rate information of the display unit. When the circuit component is controlled by the dynamic update signal, the dynamic update signal is decoded to obtain the update rate information.

10. The electronic device according to claim 1, wherein: At the first update rate, the first delayed pulse is inserted at a position adjacent to a start pulse; at the second update rate, the second delayed pulse is inserted at a position adjacent to another start pulse.

11. The electronic device according to claim 10, wherein: The first delayed pulse and the second delayed pulse are formed by the display driving circuit using segments of a clock signal, and the frequency of the clock signal is greater than the first refresh rate and the second refresh rate.

12. The electronic device according to claim 11, wherein: The first delayed pulse and the second delayed pulse contain different numbers of signal pulses of the frequency.

13. The electronic device according to claim 1, wherein: The circuit component includes a light emitting unit, and the circuit component controls the operation of the light emitting unit according to the dynamic update signal.

14. The electronic device according to claim 13, wherein: The light emitting unit is a light emitting diode or a laser diode.

15. The electronic device according to claim 13, wherein: The circuit component further includes a sensing unit. The control circuit generates a light driving signal to the light-emitting unit and a sensing driving signal to the sensing unit based on the dynamic update signal. The light-emitting unit generates a light source based on the light driving signal. The sensing unit receives a reflected light corresponding to the light source based on the sensing driving signal to generate a corresponding sensing signal.

16. The electronic device according to claim 13, wherein: The circuit component is activated according to the dynamic update signal to prevent the light emitted by the light emitting unit from interfering with the normal display of the display unit.

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