TW202131065A - Unlocking method for mobile device with in-display fingerprint - Google Patents

Abstract

An unlocking method for mobile device with in-display fingerprint is provided in the present invention. The unlocking method includes the steps of: determining whether an AOD (Always On Display) mode is entered or not; adjusting a duty cycle of an emission signal to a maximum value and adjusting a gamma setting to a low luminance setting when AOD mode is entered; determining whether a HBM mode is entered; and adjusting the gamma setting to a high luminance setting when the HBM mode is entered.

Description

Method for unlocking fingerprint mobile device under optical screen

The present invention relates to a display driving technology. More specifically, the present invention relates to an unlocking method of an optical under-screen fingerprint mobile device that can avoid flicker.

Figure 1 is a schematic diagram of the panel operation flow of the prior art optical under-screen fingerprint mobile device when unlocking. Please refer to Figure 1. Generally, the fingerprint unlocked screen under the optical screen will use an Active Matrix Organic Light Emitting Diode (OLED) panel. When the active matrix organic light-emitting diode panel enters the Always On Display (AOD mode), it will adjust the brightness to a lower brightness. As shown in Figure 1, adjust the 51H register to 03F, and the OLED power of the active matrix organic light-emitting diode panel is powered by the driver IC to save power.

When in the constant display mode, if a touch event occurs, it means that the finger touched the panel. At this time, the smartphone application The application processor (AP) will cause the display panel to exit the constant display mode and return to the normal mode. Because of the characteristics of the optical fingerprint sensor, the brightness of the fingerprint unlocking area must be high. Mode (High Brightness Mode, HBM) brightness, at this time the smartphone application processor (AP) will issue a command to make the active matrix organic light-emitting diode panel to the brightness of the high brightness mode, and let the brightness adjust the duty cycle of the signal (Emission duty) adjusted back to 100%.

Figure 2 is a schematic diagram of the corresponding relationship between the brightness level and the adjustment method of the panel when the optical under-screen fingerprint mobile device of the prior art is unlocked. Please refer to Figure 2. The brightness level used in the constant display mode is lower. In order to achieve the power saving effect, it will adjust the emission duty of the brightness adjustment signal to achieve the purpose of dimming. In this example, the above [03F] is taken as an example, but because the brightness is adjusted to a lower gear in the general constant display mode, this value falls within the range of the emission duty adjustment of the brightness adjustment signal. Because in the low brightness situation, the duty cycle of the brightness adjustment signal will not be 100%, it may be only 50%. Therefore, when a touch event occurs and returns to the normal display mode or even the high-brightness mode, the duty cycle of the brightness adjustment signal will be forced to 100% at this time, and the background will change from 50% to the duty cycle of the brightness adjustment signal. % Is adjusted to 100% and the brightness changes, and the problem of flickering occurs. In other words, the brightness change caused by the adjustment of the duty cycle will cause the screen to flicker.

An object of the present invention is to provide a method for unlocking an optical under-screen fingerprint mobile device that can avoid panel flickering, by controlling the brightness signal to maintain a constant, and GAMMA to adjust the luminous flux, so as not to affect the panel display effect , For example, under the premise that the screen does not flicker, the requirement of unlocking the mobile device with the fingerprint recognition under the optical screen can be successfully completed.

In view of this, the present invention provides a method for unlocking an optical under-screen fingerprint mobile device. The method includes the following steps: judging whether to enter an Always On Display mode (Always On Display AOD); when entering the constant display mode, adjust the brightness The duty cycle of the signal is set to the fully-on state, and the GAMMA setting is adjusted to a low-brightness GAMMA; it is judged whether to enter a high-brightness mode; and when the high-brightness mode is entered, the GAMMA is adjusted to a high-brightness GAMMA. Setting the above-mentioned duty cycle to the fully open state includes setting its value close to 100%.

According to the method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention, the above-mentioned determining whether to enter a high-brightness mode includes the following steps: determining whether a preset block is touched by a finger; and when in the constant Normal display mode, and the preset area is touched by a finger, enters high-brightness mode, and adjusts GAMMA to high-brightness GAMMA for fingerprint recognition.

According to the method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention, the above adjusting the GAMMA setting to a low brightness GAMMA includes adjusting the highest reference voltage VGMP and the lowest reference voltage VGSP of the slope of GAMMA to a minimum range. In a better In an embodiment, the above-mentioned highest reference voltage VGMP is 6V, and the above-mentioned lowest reference voltage VGSP is 4.5V.

According to the method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention, the above-mentioned adjusting GAMMA to high-brightness GAMMA includes the following steps: adjusting the highest reference voltage VGMP and the lowest reference voltage VGSP of the slope of GAMMA to a maximum range. In a preferred embodiment, the highest reference voltage VGMP is 6V, and the lowest reference voltage VGSP is 3V.

The spirit of the present invention is to set the duty cycle of the brightness adjustment signal to full on in the constant display mode, and adjust the GAMMA setting to low brightness GAMMA. Therefore, even if the fingerprint recognition under the screen requires a high brightness mode, there is no need to adjust the brightness separately. Adjust the duty cycle of the signal so that the screen will not flicker due to changes in brightness.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

S301~S305: Steps of a method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention

Figure 1 is a schematic diagram of the panel operation flow of the prior art optical under-screen fingerprint mobile device unlocking.

Figure 2 is a schematic diagram of the corresponding relationship between the brightness level and the adjustment method of the unlocked panel of the optical under-screen fingerprint mobile device of the prior art.

Figure 3 shows the light of a preferred embodiment of the present invention The flow chart of the unlocking method of the fingerprint mobile device under the learning style screen.

FIG. 4 is a schematic diagram of the GAMMA adjustment method of the unlocking method of the optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention.

FIG. 3 is a flowchart of a method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention. Please refer to Figure 3. In this embodiment, the Active Matrix Organic Light Emitting Diode (AMOLED) display is still taken as an example. However, those skilled in the art should know that passive matrix organic Passive matrix Organic Light Emitting Diode (PMOLED) displays can also be implemented, and the present invention can also be implemented if there is a display panel that can transmit light later, so the present invention is not limited to this. The unlocking method of this optical under-screen fingerprint mobile device includes the following steps:

Step S300: Start each step of the embodiment of the present invention. To facilitate the description of the present invention, it is assumed that the active matrix organic light emitting diode display at this time is in a normal mode.

Step S301: Determine whether to enter the Always On Display (AOD mode) from the general display mode, or it may also be referred to as the never-extinguishing mode. For example, smart mobile devices have When the holster is covered, the smart mobile device judges whether the holster is closed by sensing the sensing device on the smart holster, thereby judging whether it enters the constant display mode. When it is determined that the active matrix organic light emitting diode display enters the constant display mode from the normal display mode, step S302 is executed

Step S302: Enter the constant display mode. When the active matrix organic light-emitting diode display enters the constant display mode from the normal display mode, the present embodiment, for example, adjusts the emission duty of the emission signal to full on, and gives an independent group Constant display mode GAMMA setting value, so that the brightness reaches the brightness required by the constant display mode. For example, adjust the value of the register 51H so that the duty cycle of the brightness adjustment signal is set to 100%. In addition, the following figure 5 will explain how to set the GAMMA setting value in the constant display mode. It can be seen from the above step S302 that the duty cycle of the brightness adjustment signal in the constant display mode of this embodiment still maintains the set full-open value. The above-mentioned duty cycle may also be referred to as a light-emitting period or a light-emitting duty cycle.

Step S303: Determine whether to enter a high brightness mode (High Brightness Mode, HBM). Generally, in the constant display mode, if a touch occurs, it is necessary to enter the high-brightness mode to unlock the mobile device.

Step S304: Enter a high brightness mode (High Brightness Mode, HBM). When entering high-brightness mode, adjust GAMMA to high-brightness GAMMA to unlock by fingerprint recognition. At this time, the duty cycle of the brightness adjustment signal is still the set full open value, and no change is needed. Therefore, the background brightness will not change due to the duty cycle of adjusting the brightness adjustment signal, and therefore the screen will not produce the phenomenon of flickering. After entering the high brightness, the fingerprint recognition process steps are executed to unlock the mobile device.

In the above step S304, when the touch is detected, the high-brightness mode is entered, that is, the display enters the high-brightness mode (HBM) from the constant display mode to unlock. However, those skilled in the art should know that in step S304 of the embodiment of the present invention, the display may first enter the normal display mode from the constant display mode, and then trigger the high-brightness mode, so that the display enters the normal display mode. High brightness mode.

Since in some mobile device designs, fingerprint recognition only needs to be performed in a partial area, in another preferred embodiment of this embodiment, the aforementioned step S303 only needs to determine whether a predetermined area is touched by a finger, for example. touch. The above step S304 only needs to enter the high-brightness mode of the preset block and adjust the GAMMA to high-brightness GAMMA for fingerprint recognition.

FIG. 4 is a schematic diagram of the GAMMA adjustment method of the unlocking method of the optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention. Please refer to Figure 4. Because the brightness is different between the constant display mode and the normal display mode, and the duty cycle of the brightness adjustment signal is maintained at 100%, the brightness part needs to be adjusted by GAMMA. Inside the circuit, the reference voltage that determines the slope of GAMMA is generally used as the set value of GAMMA. This voltage is divided into the highest reference voltage VGMP and the lowest reference voltage VGSP. In general display mode, the highest reference voltage VGMP is 6V, and the lowest reference voltage VGSP is 3V. In the constant display mode (lower brightness), the highest reference voltage VGMP is also 6V. However, the lowest reference voltage VGSP is set to 4.5V, for example.

Therefore, the required brightness can be achieved by adjusting the lowest reference voltage VGSP. For example, in the constant display mode, adjust the highest reference voltage VGMP and the lowest reference voltage VGSP that determine the slope of GAMMA to a minimum range (such as the above 6V-4.5V); in the high-brightness mode, it will determine the highest reference for the slope of GAMMA The voltage VGMP and the lowest reference voltage VGSP are adjusted to a maximum range. However, those skilled in the art should know that adjusting the highest reference voltage VGMP or the lowest reference voltage VGSP to achieve different brightness is not the only method, so the present invention is not limited to this.

Table 1 below shows the corresponding unit timetables for full emission duty in different resolutions. Please refer to Table 1. In the above embodiment, although the duty cycle of the brightness adjustment signal is set to 100% as an example, those skilled in the art should know that the duty cycle (emission duty) of the brightness adjustment signal is fully on. At this time, it may be limited by the resolution and GOA (Gate on Array) timing design, and the duty cycle of the brightness adjustment signal may not necessarily reach 100%. Generally speaking, when the duty cycle is fully open, its actual value can be around 99.X%, for example, 99.7%. For example, in Table 1 below, when the FHD+ (Full HD) display panel is used, the closing time of the responsibility period is 6 unit time, and the opening time of the responsibility period is 2364 unit time, and the actual responsibility period after conversion is 99.7%. In the case of WQHD+ (Wide Quad HD) display panels, the responsibility The closing time of the cycle is 8 unit time, the opening time of the responsibility cycle is 3144 unit time, and the actual responsibility cycle converted is also 99.7%. It can be seen that when the duty cycle is fully open, its value will generally be close to 100%.

FIG. 5 is a schematic diagram of an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention. Please refer to Figure 5. 501 is the constant display mode display area, and 502 is the fingerprint recognition area under the screen. After entering the lock screen, according to the settings, the mobile device will enter the constant display mode. The constant display mode can display the current time, date, power and other information according to the user's settings. When the user wants to unlock the device, touch the fingerprint recognition area 502 under the screen. At this time, the screen will be set to the maximum brightness, and the fingerprint recognition area 502 under the screen will be lit to provide light for the optical fingerprint sensor. Perform fingerprint recognition. If the recognition is completed and the authentication is successful, the unlocking is completed.

In summary, the spirit of the present invention is to set the duty cycle of the brightness adjustment signal to full on and adjust the GAMMA setting to a low brightness GAMMA in the Always On Display (AOD mode) mode. Therefore, even if the optical The fingerprint recognition under the type screen requires a high-brightness mode, and there is no need to adjust the duty cycle of the brightness adjustment signal. Therefore, the screen will not flicker due to changes in brightness.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to facilitate the description of the technical content of the present invention, rather than restricting the present invention to the above-mentioned embodiments in a narrow sense, and do not exceed the spirit of the present invention and apply for patents below. The conditions of the scope, various changes and implementations made, all belong to the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

S301~S305: Steps of a method for unlocking an optical under-screen fingerprint mobile device according to a preferred embodiment of the present invention

Claims (7)

A method for unlocking an optical under-screen fingerprint mobile device, including: Judge whether to enter a constant display mode; When entering the constant display mode, set the duty cycle of a brightness adjustment signal to full on, and adjust the GAMMA setting to low brightness GAMMA; Determine whether to enter a high-brightness mode; and When entering the high-brightness mode, and adjust GAMMA to high-brightness GAMMA. For the unlocking method of the optical under-screen fingerprint mobile device described in the first item of the scope of patent application, the duty cycle of the brightness adjustment signal is set to fully open means that its value is set to close to 100%. For example, the method for unlocking an optical under-screen fingerprint mobile device described in item 1 of the scope of patent application, in which determining whether to enter a high-brightness mode includes: Determine whether a predetermined block is touched by a finger; and When in the constant display mode and the preset area is touched by a finger, the high-brightness mode is entered, and the GAMMA is adjusted to the high-brightness GAMMA for fingerprint recognition. For example, the unlocking method of an optical under-screen fingerprint mobile device described in the first item of the scope of patent application, in which, adjusting the GAMMA setting to a low brightness GAMMA includes: Adjust the highest reference voltage VGMP and the lowest reference voltage VGSP of the GAMMA slope to a minimum range. For example, the unlocking method of an optical under-screen fingerprint mobile device described in item 4 of the scope of patent application, in which: The highest reference voltage VGMP is 6V, and the lowest reference voltage VGSP is 4.5V. For example, the unlocking method of the optical under-screen fingerprint mobile device described in the first item of the scope of patent application, in which, adjusting GAMMA to high-brightness GAMMA includes: Adjust the highest reference voltage VGMP and the lowest reference voltage VGSP of the GAMMA slope to a maximum range. For example, the unlocking method of an optical under-screen fingerprint mobile device described in item 6 of the scope of patent application, in which: The highest reference voltage VGMP is 6V, and the lowest reference voltage VGSP is 3V.

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