Display device, display chip, electronic equipment, brightness adjusting circuit and method

Abstract

The invention provides a display device, a display chip, electronic equipment, a brightness adjusting circuit and a brightness adjusting method, and the brightness adjusting method comprises the steps: obtaining a display frame rate of a display screen when a fingerprint detection instruction is detected; calling a target brightness adjustment parameter corresponding to the display frame rate from a plurality of preset brightness adjustment parameters according to the display frame rate; and controlling the display screen to enter a highlight mode of fingerprint acquisition according to the target brightness adjustment parameter. According to the scheme, skipping of a specific frame rate is not needed during under-screen fingerprint detection, the response speed is higher, and smooth transition of screen brightness modes can be achieved in multiple scenes.

Description

Technical Field

[0001] The present application relates to the field of under-screen fingerprint recognition technology, and specifically to a display device, a display chip, an electronic device, a brightness adjustment circuit and method. Background Art

[0002] With the continuous advancement of technology, high screen-to-body ratio design has become a significant trend in the smartphone market, and the widespread application of under-screen fingerprint technology has greatly improved the convenience of user experience. In the current implementation of under-screen fingerprint recognition technology, a key step is to generate a high-brightness light spot in the fingerprint detection area. This mechanism effectively promotes the accurate capture of fingerprint information.

[0003] In order to ensure that the brightness of the fingerprint area is enhanced while maintaining the stability of the overall brightness of the screen, a gamma curve needs to be configured separately to achieve a perfect balance between local highlight and global visual comfort. Traditional under-screen fingerprint technology often needs to be pre-adjusted to a specific frame rate before switching to the under-screen fingerprint recognition mode, but this practice is often accompanied by a lag in the fingerprint response speed, which invisibly reduces the smoothness and satisfaction of user operations. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a display device, a display chip, an electronic device, a brightness adjustment circuit and a method, which aim to improve the response speed to fingerprint detection instructions and achieve rapid response to fingerprint detection in multiple scenarios.

[0005] According to a first aspect of the present application, a brightness adjustment method is provided, comprising:

[0006] When a fingerprint detection instruction is detected, the display frame rate of the display screen is obtained;

[0007] According to the display frame rate, calling a target brightness adjustment parameter corresponding to the display frame rate from a plurality of preset brightness adjustment parameters;

[0008] The display screen is controlled to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter.

[0009] Optionally, in the DC dimming mode, the multiple brightness adjustment parameters include multiple fingerprint gamma parameters, and the target brightness adjustment parameters include target fingerprint gamma parameters.

[0010] Optionally, in the PWM dimming mode, the multiple brightness adjustment parameters include multiple pulse width modulation signals, the target brightness adjustment parameters include target pulse width modulation signals, and / or the multiple brightness adjustment parameters include multiple driving voltages, and the target brightness adjustment parameters include target driving voltages.

[0011] Optionally, calling a target brightness adjustment parameter corresponding to the display frame rate from a plurality of preset brightness adjustment parameters according to the display frame rate includes:

[0012] generating a corresponding selection signal according to the display frame rate;

[0013] The target fingerprint gamma parameter is selected from a plurality of preset fingerprint gamma parameters based on the selection signal.

[0014] Optionally, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curves, and the target fingerprint gamma parameter includes a target fingerprint gamma curve;

[0015] Controlling the display screen to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter includes:

[0016] The target fingerprint gamma curve is used to perform brightness mapping on the display screen, so that the display screen enters a high-brightness mode for collecting fingerprints.

[0017] Optionally, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curve gain parameters, and the target fingerprint gamma parameter includes a target fingerprint gamma curve gain parameter;

[0018] Controlling the display screen to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter includes:

[0019] Performing gain adjustment on the reference fingerprint gamma curve according to the target fingerprint gamma curve gain parameter to obtain the target fingerprint gamma curve;

[0020] The target fingerprint gamma curve is used to perform brightness mapping on the display screen, so that the display screen enters a high-brightness mode for collecting fingerprints.

[0021] According to a second aspect of the present application, a brightness adjustment circuit is provided, comprising:

[0022] A selection signal generating unit, generating a corresponding selection signal according to a display frame rate of the display screen when a fingerprint detection instruction is detected;

[0023] The first dimming parameter selection unit obtains a target fingerprint gamma curve corresponding to the display frame rate according to the selection signal and a plurality of preset fingerprint gamma parameters when the DC dimming enable signal is valid, and the display screen enters a highlight mode for collecting fingerprints according to the target fingerprint gamma curve.

[0024] Optionally, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curves; and

[0025] The first dimming parameter selection unit includes:

[0026] The first selector has a data input terminal receiving the multiple fingerprint gamma curves, a selection terminal receiving the selection signal, and an output terminal outputting the target fingerprint gamma curve.

[0027] Optionally, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curve gain parameters; and

[0028] The first dimming parameter selection unit includes:

[0029] A second selector, wherein a data input terminal receives the plurality of fingerprint gamma curve gain parameters, a selection terminal receives the selection signal, and an output terminal outputs a target fingerprint gamma curve gain parameter;

[0030] The calculation unit has a first input terminal receiving the target fingerprint gamma curve gain parameter, a second input terminal receiving a reference fingerprint gamma curve, and an output terminal outputting the target fingerprint gamma curve.

[0031] Optionally, the brightness adjustment circuit further includes:

[0032] The second dimming parameter selection unit obtains a target pulse width modulation signal and / or a target driving voltage according to the selection signal and multiple pulse width modulation signals and / or multiple driving voltages when the PWM dimming enable signal is valid, and the display screen enters a highlight mode for collecting fingerprints according to the target pulse width modulation signal and / or the target driving voltage.

[0033] According to a third aspect of the present application, a display device is provided, including:

[0034] Display screen;

[0035] A brightness adjustment circuit as described in any embodiment of the present application.

[0036] The display screen includes at least one of an LCD display screen, an OLED display screen and a Mirco-LED display screen.

[0037] According to a fourth aspect of the present application, a display chip is provided, in which a brightness adjustment circuit as described in any embodiment of the present application is integrated.

[0038] According to a fifth aspect of the present application, an electronic device is provided, comprising: a display chip as described in any embodiment of the present application or a display device as described in any embodiment of the present application.

[0039] The beneficial effects of this application include at least:

[0040] When a fingerprint detection instruction is detected, the embodiment of the present application obtains the display frame rate of the display screen, and based on the obtained display frame rate, directly calls the target brightness adjustment parameter corresponding to the display frame rate from the preset multiple brightness adjustment parameters to control the display screen to enter the highlight mode for collecting fingerprints. Compared with the existing solutions, the solution of the present application does not need to jump to a specific frame rate when performing under-screen fingerprint detection. It can directly jump from the brightness mode in the current scene to the local highlight mode during fingerprint detection. It has a faster response speed to fingerprint detection instructions and can adapt well to operating environments under different frame rates, thereby achieving rapid response to fingerprint detection in multiple scenarios, that is, a smooth transition of the screen brightness mode from the normal display mode to the local highlight mode can be achieved in multiple scenarios, and the display effect is better.

[0041] It should be noted that the above general description and the following detailed description are merely exemplary and explanatory and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram showing the structure of a display device provided according to an embodiment of the present application is shown;

[0043] Figure 2 A schematic diagram showing the structure of a brightness adjustment circuit provided according to an embodiment of the present application is shown;

[0044] Figure 3 Show Figure 2 A schematic diagram of a first embodiment of a first dimming parameter selection unit;

[0045] Figure 4 Show Figure 2 A schematic diagram of a second embodiment of the first dimming parameter selection unit;

[0046] Figure 5 A schematic diagram showing a flow chart of a brightness adjustment method provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0048] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0049] In the description of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or advantageous than other embodiments. "And / or" in this article is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. "Multiple" means two or more than two.

[0050] In addition, the same figure marks in the figures represent the same or similar structures, and thus their repeated description will be omitted. That is, the various parts in this specification are described in a combination of parallel and progressive manners, and each part focuses on the differences from other parts. The same or similar parts between the various parts can be referenced to each other.

[0051] Under-screen fingerprint recognition technology is a biometric technology used to identify the identity of the user. It integrates a fingerprint sensor under the screen or on the back of the mobile phone to collect and identify the user's fingerprint. The advantage of this technology is that it can achieve more convenient fingerprint recognition without the need for additional physical buttons or sensors, while also improving the overall aesthetics and design of the mobile phone. The principle of under-screen fingerprint recognition technology is to collect the user's fingerprint information through a fingerprint sensor integrated under or on the back of the screen, and compare it with the fingerprint template stored in the device in advance to confirm the user's identity. When collecting fingerprints under the screen, it is usually necessary to display a highlight spot on the display screen to guide the user to perform fingerprint recognition operations on the under-screen fingerprint sensor, and the highlight spot can also assist the device in collecting clear and visible fingerprint images, thereby improving user experience and operational convenience.

[0052] The embodiment of the present application provides an intelligent and scenario-based display brightness adjustment solution, that is, in combination with actual application scenarios, when fingerprint detection is required, according to the current different frame rates of the display, the fingerprint mode is directly entered by calling the target brightness adjustment parameters, so as to accurately fit the brightness adjustment parameters such as the gamma curve, without having to jump to a specific frame rate, thereby achieving a fast response to fingerprint detection instructions and well adapting to operating environments under different frame rates.

[0053] Figure 1 Shown is a schematic diagram of the structure of a display device provided in an embodiment of the present application.

[0054] like Figure 1 As shown, in this embodiment, the display device 100 includes: a gate driving circuit 110 , a source driving circuit 120 , a display screen (also called a display panel) 130 , a brightness adjustment circuit 140 and a data processing unit 150 .

[0055] The display screen 130 includes m row drive lines, a*n column drive lines, and a pixel array consisting of m*n pixels, and the m*n pixels are respectively arranged at the intersections of the m row drive lines and the n column drive lines, where m and n are both integers greater than or equal to 1.

[0056] Optionally, the display screen 130 may be, for example, an LCD display screen (i.e., liquid crystal display screen), an OLED display screen (i.e., organic light-emitting diode display screen), a Micro-LED display screen, or the like, which may realize an under-screen fingerprint recognition function.

[0057] For example, taking an OLED display screen as an example, Figure 1 In the display screen 130 shown, m*n pixels include m*n organic light-emitting diodes, and each organic light-emitting diode is connected to a common cathode, that is, the cathodes of the organic light-emitting diodes in the same row are connected to the same row drive line, and the anodes are connected to different column drive lines respectively. However, other implementations are also possible. For example, each organic light-emitting diode may also be connected to a common anode, that is, the anodes of the organic light-emitting diodes in the same row are connected to the same row drive line, and the cathodes are connected to different column drive lines respectively. The present application does not impose strict restrictions on this.

[0058] The gate drive circuit 110 is respectively connected to the m row drive lines, and opens the m row drive lines in sequence according to a plurality of row drive signals (also called row scanning signals), for example, connecting the ground path of each row drive line in sequence in each display frame. The source drive circuit 120 is respectively connected to the n column drive lines, and provides column drive signals to the n column drive lines. When a row drive line of the gate drive circuit 110 is controlled to be in an open state, the source drive circuit 120 controls the n column drive lines on the display screen 130 to be opened in sequence / simultaneously, connecting the current paths of the pixels on the corresponding rows and columns.

[0059] The brightness adjustment circuit 140 is coupled to the source driving circuit 120. When a fingerprint detection instruction is detected, a target brightness adjustment parameter is provided according to the current display frame rate of the display screen 130, so that the source driving circuit 120 drives each pixel in the display screen 130 according to the target brightness adjustment parameter, and controls the display screen 130 to enter a high-brightness mode for collecting fingerprints.

[0060] In some embodiments, the target brightness adjustment parameter includes a target fingerprint gamma curve Fps_gam. The target fingerprint gamma curve Fps_gam output by the brightness adjustment circuit 140 is converted into grayscale data Data by the data processing unit 150 and then output to the source driver circuit 120. The source driver circuit 120 controls the display screen 130 to enter a highlight mode for collecting fingerprints according to the grayscale data Data.

[0061] In other embodiments, the target brightness adjustment parameters include at least one of a target pulse width modulation signal PWM and a target driving voltage pic, and the brightness adjustment circuit 140 outputs the target pulse width modulation signal PWM and / or the target driving voltage pic to the source driving circuit 120, and the source driving circuit 120 controls the display screen 130 to enter a highlight mode for collecting fingerprints according to the target pulse width modulation signal PWM and / or the target driving voltage pic.

[0062] In some preferred embodiments, in order to avoid problems such as uneven brightness and uneven chromaticity during the brightness adjustment process, the brightness adjustment circuit 140 can be configured to adopt a PWM (Pulse Width Modulation) dimming mode when the display screen 130 is at low brightness, and to adopt a DC (Direct Current) dimming mode when the display screen 130 is at high brightness, wherein in the PWM dimming mode, the brightness adjustment circuit 140 provides a target pulse width modulation signal PWM and / or a target driving voltage pic as a target brightness adjustment parameter according to the current display frame rate of the display screen 130; in the DC dimming mode, the brightness adjustment circuit 140 provides a target fingerprint gamma curve Fps_gam as a target brightness adjustment parameter according to the current display frame rate of the display screen 130.

[0063] Figure 2 FIG. 1 is a schematic diagram of a brightness adjustment circuit according to an embodiment of the present application. Figure 2 In the example shown, the brightness adjustment circuit 140 specifically includes a selection signal generating unit 141 , a first dimming parameter selecting unit 142 , and a second dimming parameter selecting unit 144 .

[0064] The selection signal generating unit 141 generates a corresponding selection signal Fr_mode according to the display frame rate Fr of the display screen 130 when the fingerprint detection instruction is detected. The first dimming parameter selecting unit 142 is connected to the selection signal generating unit 141, and when the DC dimming enable signal DC_EN is valid, the target fingerprint gamma curve Fr_gam corresponding to the display frame rate Fr is obtained according to the selection signal Fr_mode and the preset multiple fingerprint gamma parameters. The second dimming parameter selecting unit 143 is connected to the selection signal generating unit 141, and when the PWM dimming enable signal PWM_EN is valid, the target pulse width modulation signal PWM and / or the target driving voltage pic are obtained according to the selection signal Fr_mode and multiple pulse width modulation signals and / or multiple driving voltages.

[0065] Furthermore, in the DC dimming mode, the display screen 130 enters a highlight mode for collecting fingerprints according to the target fingerprint gamma curve Fr_gam output by the brightness adjustment circuit 140; in the PWM dimming mode, the display screen 130 enters a highlight mode for collecting fingerprints according to the target pulse width modulation signal PWM and / or the target driving voltage pic output by the brightness adjustment circuit 140.

[0066] It can be understood that in some other embodiments, only one of the first dimming parameter selection unit 142 and the second dimming parameter selection unit 144 can be set in the brightness adjustment circuit 140, so that only the PWM dimming mode or the DC dimming mode is used to adjust the brightness of the display screen 130 within the entire brightness range, so as to enable the display screen 130 to enter the high-brightness mode when under-screen fingerprint collection is required.

[0067] The display frame rate Fr can be directly obtained from the corresponding storage unit or control module when the brightness adjustment circuit 140 or other circuit modules in the display device detects a fingerprint detection instruction, or obtained by calculating through the obtained relevant data.

[0068] The method of generating the fingerprint detection instruction includes, but is not limited to: generating when a finger is sensed pressing the fingerprint detection area on the display screen in the screen-off state, generating when fingerprint collection is required in certain applications (such as when identity verification is required), etc.

[0069] Optionally, the selection signal generating unit 141 generates a corresponding selection signal Fr_mode according to the obtained numerical value of the display frame rate Fr or the frame rate range of the display frame rate Fr. In this embodiment, the signal form of the selection signal Fr_mode is not strictly limited. For example, the selection signal Fr_mode can be an analog signal with multiple level values, or a digital signal with at least one digital bit, or other representation forms that can trigger the realization of selecting one output of multiple input parameters.

[0070] In some embodiments, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curves. Figure 3 As shown, the first dimming parameter selection unit 142 includes a first selector 1421, a data input terminal of the first selector 1421 receives a plurality of fingerprint gamma curves, a selection terminal of the first selector 1421 receives a selection signal Fr_mode, and an output terminal of the first selector 1421 outputs a target fingerprint gamma curve Fr_gam.

[0071] In these embodiments, the multiple fingerprint gamma curves are, for example, pre-stored in a storage unit, each fingerprint gamma curve corresponds to a display frame rate or a display frame rate range of the display screen 130, and each display frame rate or display frame rate range corresponds to an interface state (such as a screen-off unlock state, a video playback state, a variety of game states, or other interface operation states).

[0072] When a fingerprint detection instruction is detected, the brightness adjustment circuit 140 generates a corresponding selection signal Fr_mode according to the current display frame rate Fr of the display screen 130, and selects a fingerprint gamma curve corresponding to the current display frame rate Fr as the target fingerprint gamma curve Fr_gam according to the selection signal Fr_mode for output. After the data processing unit 150 converts the target fingerprint gamma curve Fr_gam into corresponding grayscale data Data, the source driving circuit 120 can control the display screen 130 to enter the highlight mode of fingerprint collection according to the grayscale data Data output by the data processing unit 150.

[0073] For example, assuming that before the fingerprint detection instruction is detected, the interface state of the display screen 130 is a certain game state. By adopting the technical solution disclosed in the embodiment of the present application, a fingerprint gamma curve corresponding to the display frame rate Fr1 can be selected from the preset multiple fingerprint gamma curves according to the display frame rate (such as Fr1) corresponding to the game interface state obtained when the fingerprint detection instruction is detected, and the display screen 130 is controlled to directly enter the highlight state of fingerprint collection from the game state based on the fingerprint gamma curve. Compared with the existing solution that needs to first transition from the game state to a non-game state with a specific frame rate, and then enter the highlight state of fingerprint collection from the non-game state, the solution of this embodiment only needs to pre-configure the configuration parameters of multiple fingerprint gamma curves and store them, so that when off-screen fingerprint collection is required, it can directly jump from the brightness mode in the current scene to the local highlight mode during fingerprint detection. The response speed to the fingerprint detection instruction is faster, and it can also adapt well to the operating environment under different frame rates, so as to achieve seamless response to fingerprint detection in multiple scenes, that is, the smooth transition of the screen brightness mode from the normal display mode to the local highlight mode can be achieved in multiple scenes.

[0074] It should be noted that Figure 3The multiple fingerprint gamma curves shown in the figure include: a first fingerprint gamma curve Fps_gam_hf0, a second fingerprint gamma curve Fps_gam_hf1, a third fingerprint gamma curve Fps_gam_hf2 and a fourth fingerprint gamma curve Fps_gam_hf3, but in other embodiments, the number of the multiple fingerprint gamma curves received by the first dimming parameter selection unit 142 can also be other smaller or larger values.

[0075] In some embodiments, the plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curve gain parameters. Figure 4 As shown, the first dimming parameter selection unit 142 includes: a second selector 1422 and a calculation unit 1423, the data input end of the second selector 1422 receives a plurality of fingerprint gamma curve gain parameters, the selection end of the second selector 1422 receives a selection signal Fr_mode, and the output end of the second selector 1422 outputs a target fingerprint gamma curve gain parameter Fps_offset; the first input end of the calculation unit 1423 receives the target fingerprint gamma curve gain parameter Fps_offset, the second input end of the calculation unit 1423 receives a reference fingerprint gamma curve Fps_gam0, and the output end of the calculation unit 1423 outputs the target fingerprint gamma curve Fps_gam.

[0076] In these embodiments, the multiple fingerprint gamma curve gain parameters are, for example, pre-stored in a storage unit, each fingerprint gamma curve gain parameter corresponds to a display frame rate or a display frame rate range of the display screen 130, and each display frame rate or display frame rate range corresponds to an interface state (such as a screen-off unlock state, a video playback state, a variety of game states, or other interface operation states).

[0077] When a fingerprint detection instruction is detected, the brightness adjustment circuit 140 generates a corresponding selection signal Fr_mode according to the current display frame rate Fr of the display screen 130, selects a fingerprint gamma curve gain parameter Fps_offset corresponding to the current display frame rate Fr according to the selection signal Fr_mode, and then obtains the target fingerprint gamma curve Fr_gam after the gain parameter Fps_offset and the reference fingerprint gamma curve Fps_gam0 are calculated by the calculation unit 1423. After the target fingerprint gamma curve Fr_gam is converted into the corresponding grayscale data Data by the data processing unit 150, the source driving circuit 120 can control the display screen 130 to enter the highlight mode of fingerprint collection according to the grayscale data Data output by the data processing unit 150.

[0078] Understandably, Figure 4 The illustrated embodiment can be implemented with Figure 3 The same technical effect as the embodiment is shown, and compared with the aforementioned Figure 3 The embodiment shown, Figure 4 The illustrated embodiment only requires pre-configuration of multiple fingerprint gamma curve gain parameters and storage, requiring fewer additional configurations and data storage, effectively avoiding an increase in the number of gamma sets, and achieving better performance while ensuring low area and low power consumption of the system.

[0079] It should be noted that Figure 4 The multiple fingerprint gamma curve gain parameters shown in the figure include: a first fingerprint gamma curve gain parameter Fps_offset_hf0, a second fingerprint gamma curve gain parameter Fps_offset_hf1, a third fingerprint gamma curve gain parameter Fps_offset_hf2 and a fourth fingerprint gamma curve gain parameter Fps_offset_hf3, but in other embodiments, the number of the multiple fingerprint gamma curve gain parameters received by the first dimming parameter selection unit 142 may also be other smaller or larger values.

[0080] After the fingerprint collection is completed, the brightness adjustment circuit 140 no longer outputs the target brightness adjustment parameters. At this time, the source driving circuit 120 controls the display screen 130 to exit the high brightness mode and enter the normal display mode according to the grayscale data corresponding to the gamma curve in the normal display mode, the pulse width modulation signal and the driving voltage.

[0081] Furthermore, an embodiment of the present application also provides a display chip, in which a brightness adjustment circuit 140 as disclosed in any of the aforementioned embodiments is integrated.

[0082] Furthermore, an embodiment of the present application also provides an electronic device, which includes a display chip as disclosed in any of the foregoing embodiments or a display device 100 as disclosed in any of the foregoing embodiments. It can be understood that the electronic device can be, for example, a mobile phone, a tablet, or other device with a display screen and supporting under-screen fingerprint recognition.

[0083] Furthermore, the embodiment of the present application also provides a brightness adjustment method, which can be applied to the brightness adjustment circuit 140 and the display device 100 disclosed in any of the above embodiments, with reference to Figure 5 , Figure 5 The figure is a flow chart of the brightness adjustment method provided in the embodiment of the present application. When implemented specifically, the brightness adjustment method includes executing the following steps:

[0084] In step 510, when a fingerprint detection instruction is detected, a display frame rate of the display screen is acquired.

[0085] In this step, the display frame rate Fr can be directly obtained from the corresponding storage unit or control module when the brightness adjustment circuit 140 or other circuit modules in the display device detects a fingerprint detection instruction, or obtained by calculating through the obtained relevant data.

[0086] The method of generating the fingerprint detection instruction includes, but is not limited to: generating when a finger is sensed pressing the fingerprint detection area on the display screen in the screen-off state, generating when fingerprint collection is required in certain applications (such as when identity verification is required), etc.

[0087] In step 520, a target brightness adjustment parameter corresponding to the display frame rate is called from a plurality of preset brightness adjustment parameters according to the display frame rate.

[0088] In this embodiment, in the DC dimming mode, the plurality of brightness adjustment parameters include a plurality of fingerprint gamma parameters, and the target brightness adjustment parameter includes a target fingerprint gamma parameter. At this time, step 520 further includes: generating a corresponding selection signal according to the display frame rate; and selecting a target fingerprint gamma parameter from a plurality of preset fingerprint gamma parameters based on the selection signal.

[0089] In the PWM dimming mode, the multiple brightness adjustment parameters include multiple pulse width modulation signals and / or multiple driving voltages. When the multiple brightness adjustment parameters are expressed as multiple pulse width modulation signals, the target brightness adjustment parameter includes a target pulse width modulation signal. At this time, step 520 further includes: generating a corresponding selection signal according to the display frame rate; selecting the target pulse width modulation signal from the preset multiple pulse width modulation signals based on the selection signal. When the multiple brightness adjustment parameters are expressed as multiple driving voltages, the target brightness adjustment parameter includes a target driving voltage. At this time, step 520 further includes: generating a corresponding selection signal according to the display frame rate; selecting the target driving voltage from the preset multiple driving voltages based on the selection signal.

[0090] Furthermore, a corresponding selection signal may be generated according to the obtained numerical value of the display frame rate or the frame rate range of the display frame rate. In this embodiment, the signal form of the selection signal is not strictly limited. For example, the selection signal may be an analog signal with multiple level values, or a digital signal with at least one digital bit, or other representation forms that can trigger the realization of selecting one output of multiple input parameters.

[0091] Optionally, in some embodiments, the PWM dimming mode may be used to adjust the brightness within the low brightness range of the display screen, and the DC dimming mode may be used to adjust the brightness within the high brightness range of the display screen. In other embodiments, only the PWM dimming mode or the DC dimming mode may be used to adjust the brightness within the full brightness range of the display screen.

[0092] In step 530, the display screen is controlled to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter.

[0093] Taking the DC dimming mode as an example, in some embodiments, the multiple fingerprint gamma parameters include multiple fingerprint gamma curves, and the target fingerprint gamma parameters include a target fingerprint gamma curve. At this time, step 530 further includes: using the target fingerprint gamma curve to map the brightness of the display screen, so that the display screen enters the highlight mode of collecting fingerprints. The specific implementation of these embodiments can refer to the aforementioned Figure 3 The embodiments shown are understood for the sake of simplicity and are not described in detail here.

[0094] In some other embodiments, the multiple fingerprint gamma parameters include multiple fingerprint gamma curve gain parameters, and the target fingerprint gamma parameters include target fingerprint gamma curve gain parameters. In this case, step 530 further includes: performing gain adjustment on the reference fingerprint gamma curve according to the target fingerprint gamma curve gain parameter to obtain the target fingerprint gamma curve; and using the target fingerprint gamma curve to perform brightness mapping on the display screen so that the display screen enters the highlight mode for collecting fingerprints. The specific implementation of these embodiments can refer to the aforementioned Figure 4 The embodiments shown are understood for the sake of simplicity and are not described in detail here.

[0095] In specific implementation, the specific implementation of each step in the brightness adjustment method described above and the technical effects that can be achieved can refer to the various embodiments of the brightness adjustment circuit 140 described above, and will not be repeated here.

[0096] In summary, compared with the traditional solution, the brightness adjustment solution disclosed in each embodiment of the present application can achieve the following technical effects:

[0097] 1. The fingerprint response speed is faster, which greatly improves the smoothness and satisfaction of user operation.

[0098] 2. The system can adapt to the operating environment under different frame rates, realize smooth transition from normal display mode to local highlight fingerprint detection mode, and present better display effect.

[0099] 3. The solution of flexibly adjusting the gain parameters of the fingerprint gamma curve according to the different interface states of the display screen can avoid the increase of the number of gamma sets and achieve better performance while ensuring low area and low power consumption.

[0100] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present application, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present application.

Claims

1. A brightness adjustment method, comprising: When a fingerprint detection instruction is detected, the display frame rate of the display screen is obtained; According to the display frame rate, calling a target brightness adjustment parameter corresponding to the display frame rate from a plurality of preset brightness adjustment parameters; The display screen is controlled to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter.

2. The brightness adjustment method according to claim 1, wherein: In the DC dimming mode, the plurality of brightness adjustment parameters include a plurality of fingerprint gamma parameters, and the target brightness adjustment parameters include a target fingerprint gamma parameter.

3. The brightness adjustment method according to claim 1, wherein: In the PWM dimming mode, the multiple brightness adjustment parameters include multiple pulse width modulation signals, the target brightness adjustment parameters include target pulse width modulation signals, and / or the multiple brightness adjustment parameters include multiple driving voltages, and the target brightness adjustment parameters include target driving voltages.

4. The brightness adjustment method according to claim 2, wherein: According to the display frame rate, calling a target brightness adjustment parameter corresponding to the display frame rate from a plurality of preset brightness adjustment parameters includes: generating a corresponding selection signal according to the display frame rate; The target fingerprint gamma parameter is selected from a plurality of preset fingerprint gamma parameters based on the selection signal.

5. The brightness adjustment method according to claim 2 or 4, wherein: The plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curves, and the target fingerprint gamma parameters include a target fingerprint gamma curve; Controlling the display screen to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter includes: The target fingerprint gamma curve is used to perform brightness mapping on the display screen, so that the display screen enters a high-brightness mode for collecting fingerprints.

6. The brightness adjustment method according to claim 2 or 4, wherein: The plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curve gain parameters, and the target fingerprint gamma parameters include a target fingerprint gamma curve gain parameter; Controlling the display screen to enter a highlight mode for collecting fingerprints according to the target brightness adjustment parameter includes: Performing gain adjustment on the reference fingerprint gamma curve according to the target fingerprint gamma curve gain parameter to obtain the target fingerprint gamma curve; The target fingerprint gamma curve is used to perform brightness mapping on the display screen, so that the display screen enters a high-brightness mode for collecting fingerprints.

7. A brightness adjustment circuit, comprising: A selection signal generating unit, generating a corresponding selection signal according to a display frame rate of the display screen when a fingerprint detection instruction is detected; The first dimming parameter selection unit obtains a target fingerprint gamma curve corresponding to the display frame rate according to the selection signal and a plurality of preset fingerprint gamma parameters when the DC dimming enable signal is valid, and the display screen enters a highlight mode for collecting fingerprints according to the target fingerprint gamma curve.

8. The brightness adjustment circuit according to claim 7, wherein: The plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curves; as well as The first dimming parameter selection unit includes: The first selector has a data input terminal receiving the multiple fingerprint gamma curves, a selection terminal receiving the selection signal, and an output terminal outputting the target fingerprint gamma curve.

9. The brightness adjustment circuit according to claim 7, wherein: The plurality of fingerprint gamma parameters include a plurality of fingerprint gamma curve gain parameters; as well as The first dimming parameter selection unit includes: A second selector, wherein a data input terminal receives the plurality of fingerprint gamma curve gain parameters, a selection terminal receives the selection signal, and an output terminal outputs a target fingerprint gamma curve gain parameter; The calculation unit has a first input terminal receiving the target fingerprint gamma curve gain parameter, a second input terminal receiving a reference fingerprint gamma curve, and an output terminal outputting the target fingerprint gamma curve.

10. The brightness adjustment circuit according to claim 7, wherein: The brightness adjustment circuit also includes: The second dimming parameter selection unit obtains a target pulse width modulation signal and / or a target driving voltage according to the selection signal and multiple pulse width modulation signals and / or multiple driving voltages when the PWM dimming enable signal is valid, and the display screen enters a highlight mode for collecting fingerprints according to the target pulse width modulation signal and / or the target driving voltage.

11. A display device, comprising: Display screen; A brightness adjustment circuit as described in any one of claims 7 to 10.

12. The display device according to claim 11, wherein: The display screen includes at least one of an LCD display screen, an OLED display screen and a Mirco-LED display screen.

13. A display chip, wherein the brightness adjustment circuit according to any one of claims 7 to 10 is integrated into the display chip.

14. An electronic device, comprising: The display chip as claimed in claim 13.

Images