A controller, a fingerprint unlocking method, and a display device

Abstract

The application discloses a controller, a fingerprint unlocking method and a display device. The controller of one embodiment is applied to a display panel, the display panel comprises a display area and a fingerprint unlocking area, and the controller comprises: a display brightness value acquisition module, which is used for acquiring a display brightness value of the display panel; a display brightness value judgment module, which is used for judging whether the display brightness value is greater than a preset inflection point brightness value, and generating a first judgment result if yes or a second judgment result if no; and a fingerprint unlocking control module, which is used for calling a corresponding driving voltage to perform fingerprint unlocking of the fingerprint unlocking area according to the display brightness value based on the first judgment result, or calling a corresponding driving voltage to perform fingerprint unlocking of the fingerprint unlocking area according to a brightness calibration parameter determined by the display brightness value based on the second judgment result. The controller of the embodiment of the application can improve the light spot brightness fluctuation and the flicker of the fingerprint background brightness in the fingerprint unlocking process.

Description

Technical Field

[0001] This invention relates to the field of display technology. More specifically, it relates to a controller, a fingerprint unlocking method, and a display device. Background Technology

[0002] When fingerprint unlocking is performed, there are unlocking schemes under different brightness environments. Therefore, when fingerprint unlocking is performed at any DBV (display brightness value), the ELVSS voltage (power supply negative terminal voltage) is different for different DBV (display brightness value). Different ELVSS will cause the brightness of the fingerprint spot to vary, which does not meet the optical acquisition characteristics required for fingerprint unlocking and affects the fingerprint unlocking performance. Summary of the Invention

[0003] The purpose of this invention is to provide a controller, a fingerprint unlocking method, and a display device to solve at least one of the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The first aspect of this invention provides a controller applied to a display panel, the display panel including a display area and a fingerprint unlocking area.

[0006] The controller includes:

[0007] The display brightness value acquisition module is used to acquire the display brightness value of the display panel;

[0008] The display brightness value judgment module is used to determine whether the display brightness value is greater than a preset inflection point brightness value. If it is, a first judgment result is generated; otherwise, a second judgment result is generated.

[0009] The fingerprint unlocking control module is used to unlock the fingerprint unlocking area by calling the corresponding driving voltage based on the first judgment result and the display brightness value, or to unlock the fingerprint unlocking area by calling the corresponding driving voltage based on the second judgment result and the brightness calibration parameter determined by the display brightness value.

[0010] Furthermore, the controller also includes a drive data acquisition module, which includes:

[0011] The gamma value calculation unit is used to determine the gamma value for calling the fingerprint unlocking area to unlock the fingerprint based on the display parameters of the display panel and the light spot parameters of the fingerprint unlocking area.

[0012] A driving voltage calculation unit is used to set multiple dimming bands of the display panel based on the display parameters and the light spot parameters, and to calculate the driving voltage of each dimming band, wherein the dimming band includes a set of multiple bands with different brightness values, and each brightness value band includes a different reference brightness value representing that brightness value band.

[0013] Furthermore, the dimming band includes a first dimming set and a second dimming set, wherein,

[0014] The first dimming set includes brightness value bands where the reference brightness value is less than the inflection point brightness value;

[0015] The second dimming set includes brightness value bands whose reference brightness value is greater than or equal to the inflection point brightness value.

[0016] Furthermore, the reference brightness value is equal to the driving voltage corresponding to the brightness value band of the inflection point brightness value, which is equal to the driving voltage corresponding to each brightness value band in the first dimming set.

[0017] The driving voltage corresponding to the brightness value band of the reference brightness value is equal to the brightness value of the inflection point, which is different from the driving voltage corresponding to other brightness value bands in the second dimming set.

[0018] Furthermore, the fingerprint unlocking control module includes a first unlocking unit, which is used to find a brightness value band that matches the display brightness value based on the first judgment result, and call the driving voltage of the dimming band corresponding to the brightness value band and the gamma value to unlock.

[0019] Furthermore, the fingerprint unlocking control module includes a second unlocking unit, the second unlocking unit comprising:

[0020] A brightness value matching subunit is used to find a brightness value band that matches the display brightness value based on a second judgment result, wherein the brightness value band is located in the first dimming set;

[0021] A brightness value calibration subunit is used to determine brightness calibration parameters based on the display brightness value, wherein the brightness calibration parameters make the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value.

[0022] The background call subunit is used to utilize brightness calibration parameters to transition the background brightness of the display area from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value; and

[0023] The second result unlocking subunit is used to call the driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value to unlock.

[0024] Furthermore, the brightness calibration subunit is further configured to determine the transparency data corresponding to the inflection point brightness value based on the display parameters and the light spot parameters; call the reference brightness value matched by the display brightness value as the first calculated value; call the reference brightness value matched by the inflection point brightness value as the second calculated value; and obtain the brightness calibration parameters based on the first calculated value, the second calculated value, and the transparency data.

[0025] Furthermore, the brightness calibration parameter Alpha gain The following formula is used to calculate:

[0026] Alpha gain =(Target_Lv / Threshold_Lv)^ (1 / 2.2) *Alpha0;

[0027] Where Target_Lv is the first calculated value; Threshold_Lv is the second calculated value; and Alpha0 is the transparency data.

[0028] A second aspect of the present invention provides a fingerprint unlocking method for a display panel, the display panel including a display area and a fingerprint unlocking area.

[0029] The fingerprint unlocking method includes:

[0030] Obtain the display brightness value of the display panel;

[0031] Based on the displayed brightness value, determine whether it is greater than or equal to a preset inflection point brightness value. If yes, generate a first judgment result; otherwise, generate a second judgment result.

[0032] Fingerprint unlocking of the fingerprint unlocking area is performed based on the first judgment result and by calling the corresponding driving voltage and preset gamma value according to the display brightness value; or, fingerprint unlocking of the fingerprint unlocking area is performed based on the second judgment result and by calling the corresponding driving voltage and preset gamma value according to the brightness calibration parameters determined by the display brightness value.

[0033] Furthermore, before obtaining the display brightness value of the display panel, the method further includes:

[0034] The gamma value for fingerprint unlocking is determined based on the display parameters and the light spot parameters;

[0035] Based on the display parameters and the light spot parameters, the display panel is configured with multiple dimming bands. The dimming bands include a set of multiple different brightness value bands, and each brightness value band includes a different reference brightness value representing that brightness value band.

[0036] The driving voltage for each dimming band is calculated based on the display parameters and the light spot parameters.

[0037] Furthermore, the step of unlocking the fingerprint unlocking area based on the first judgment result and calling the corresponding driving voltage according to the display brightness value further includes:

[0038] Find the brightness value band that matches the displayed brightness value;

[0039] The driving voltage of the dimming band corresponding to the brightness value band and the gamma value are used to unlock the signal.

[0040] Furthermore, the step of unlocking the fingerprint unlocking area based on the second judgment result and the corresponding driving voltage determined by the display brightness value further includes:

[0041] Find a brightness value band that matches the display brightness value, the brightness value band being located in the first dimming set;

[0042] A brightness calibration parameter is determined based on the display brightness value, and the brightness calibration parameter makes the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value.

[0043] Using brightness calibration parameters, the background brightness of the display area is transitioned from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value;

[0044] The driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value are used to unlock the circuit.

[0045] Furthermore, determining the brightness calibration parameters based on the displayed brightness value further includes:

[0046] Based on the display parameters and the light spot parameters, determine the transparency data corresponding to the inflection point brightness value;

[0047] The reference brightness value matched by the displayed brightness value is used as the first calculated value, and the reference brightness value matched by the inflection point brightness value is used as the second calculated value;

[0048] The brightness calibration parameters are obtained based on the first calculated value, the second calculated value, and the transparency data.

[0049] A third aspect of the present invention provides a display device, including the controller and display panel described in the first aspect of the present invention.

[0050] The beneficial effects of this invention are as follows:

[0051] The controller in this embodiment of the invention makes a judgment based on the current display brightness value of the display panel and generates different judgment results. Based on the first judgment result, it directly calls the driving data and gamma value to unlock the fingerprint. Based on the second judgment result, it calls the brightness calibration value to calibrate and then calls the driving data and gamma value to unlock the fingerprint. The controller in this embodiment of the invention uses only the same set of gamma values ​​to unlock the fingerprint, reducing data occupation. The brightness calibration parameters can reduce the fluctuation of the light spot brightness and the flicker of the fingerprint background brightness during the fingerprint unlocking process. Attached Figure Description

[0052] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0053] Figure 1 A timing diagram showing the voltage crossing at the negative terminal of the power supply during fingerprint unlocking in a relevant embodiment is shown.

[0054] Figure 2 A schematic diagram of the architecture of a controller according to an embodiment of the present invention is shown;

[0055] Figure 3 A top view schematic diagram of a display panel according to an embodiment of the present invention is shown;

[0056] Figure 4 This diagram illustrates the architecture of another alternative embodiment of the controller according to an embodiment of the present invention;

[0057] Figure 5 A schematic diagram illustrating an optional embodiment of the fingerprint unlocking control module of the present invention is shown.

[0058] Figure 6 A schematic diagram illustrating an optional embodiment of the fingerprint unlocking control module of the present invention is shown.

[0059] Figure 7 A flowchart illustrating another embodiment of the fingerprint unlocking method of the present invention is shown;

[0060] Figure 8 A flowchart illustrating step S65 of an embodiment of the present invention is shown;

[0061] Figure 9 The flowchart of step S67 of an embodiment of the present invention is shown. Detailed Implementation

[0062] To more clearly illustrate the present invention, the following description, in conjunction with embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0063] When performing fingerprint unlocking, the related fingerprint unlocking scheme first switches the background to LHBM (Local Highlight Mode). Above the preset brightness value inflection point, the fingerprint spot in the fingerprint unlocking area reuses the current DBV (Display Brightness Value) and calls the first set of Gamma values ​​stored in the register. Below the preset brightness value inflection point, another set of Gamma values ​​is calculated and stored in the register. Therefore, the related fingerprint unlocking scheme occupies two sets of Gamma values.

[0064] like Figure 1 As shown, the ELVSS voltages corresponding to the first and second display brightness are not the same. Therefore, when fingerprint unlocking is performed at different DBV values ​​(display brightness values), the ELVSS voltage (power supply negative terminal voltage) is different for different DBV values. The ELVSS voltage difference will cause the brightness of the fingerprint spot to vary, which does not meet the optical acquisition environment required for fingerprint acquisition and affects the fingerprint unlocking performance of the display product.

[0065] Furthermore, during the fingerprint unlocking process, color distortion can occur when there is an error between the calculated background brightness and the current background brightness. If it is a batch of display panels, the product differences of the display panels will cause the background color distortion to be more serious.

[0066] In view of this, the present invention proposes a controller, a fingerprint unlocking method, and a display device to solve the above problems.

[0067] The first embodiment of the present invention proposes a controller, applied to, for example... Figure 3 The display panel shown includes a display area AA and a patterned fingerprint unlocking area FA. The display panel dims using a first dimming scheme when the display brightness value is greater than or equal to a preset inflection point brightness value, and uses a second dimming scheme when the display brightness value is less than the preset inflection point brightness value. In a specific example, taking an inflection point brightness value of 90 nits as an example, when the display panel displays at a brightness value greater than or equal to 90 nits, a DC (direct current) dimming scheme is used; when the display panel displays at a brightness value less than 90 nits, a PWM (pulse width modulation) dimming scheme is used. In this embodiment, the inflection point brightness value is used as the basis for the controller to determine fingerprint unlocking, reducing the amount of data. In another example, the preset inflection point brightness value in this embodiment may differ from the boundary point between the first and second dimming schemes; those skilled in the art can design according to actual applications.

[0068] like Figure 2 As shown, the controller in this embodiment of the invention includes:

[0069] The display brightness value acquisition module is used to acquire the display brightness value of the display panel;

[0070] The display brightness value judgment module is used to determine whether the display brightness value is greater than a preset inflection point brightness value. If it is, a first judgment result is generated; otherwise, a second judgment result is generated.

[0071] The fingerprint unlocking control module is used to unlock the fingerprint unlocking area FA by calling the corresponding driving voltage based on the first judgment result and the display brightness value, or to unlock the fingerprint unlocking area FA by calling the corresponding driving voltage based on the second judgment result and the brightness calibration parameter determined by the display brightness value.

[0072] The controller in this embodiment of the invention makes a judgment based on the current display brightness value of the display panel and generates different judgment results. Based on the first judgment result, it directly calls the driving data and gamma value to unlock the fingerprint. Based on the second judgment result, it calls the brightness calibration value to calibrate and then calls the driving data and gamma value to unlock the fingerprint. The controller in this embodiment of the invention uses only the same set of gamma values ​​to reduce data occupation. The brightness calibration parameters can reduce the fluctuation of the light spot brightness and the flicker of the fingerprint background brightness during the fingerprint unlocking process.

[0073] In this embodiment, the Display Brightness Value (DBV) represents the display brightness of the display panel, and the DBV can be positively correlated with the display brightness. For example, the minimum display brightness of the display panel is 1 nit, and the maximum display brightness is 1000 nits. The transparency data value corresponding to 1 nit is 0, and the transparency data value corresponding to 1000 nits is 4095. The display brightness between 1 nit and 1000 nits can be represented by transparency data values ​​between 0 and 4095, where the transparency data values ​​are integers.

[0074] In this embodiment of the invention, the preset inflection point brightness value is determined based on the display parameters of the display panel. For example, the preset inflection point brightness value in this embodiment is 90 nits. The display brightness is low when it is between 0 and 90 nits and high when it is between 90 and 1000 nits.

[0075] In an optional embodiment, such as Figure 4 As shown, the controller further includes a drive data acquisition module, which includes a gamma value calculation unit and a drive voltage calculation unit.

[0076] In this embodiment of the invention, the gamma value calculation unit is used to determine the gamma value for calling the fingerprint unlocking area FA to perform fingerprint unlocking based on the display parameters of the display panel and the light spot parameters of the fingerprint unlocking area FA;

[0077] The display parameters of the display panel in this embodiment include the display panel refresh rate, display brightness and other related display parameter designs. The light spot parameters of the fingerprint unlocking area FA are related parameters such as the light spot brightness and light spot size of the fingerprint light spot. The gamma value calculation unit is set according to the above parameters to obtain the gamma value for calling the fingerprint unlocking area FA to unlock the fingerprint, and stores the gamma value in the register of the display panel. The gamma data is called when unlocking the fingerprint.

[0078] The driving voltage calculation unit of this embodiment is used to set multiple dimming bands of the display panel based on the display parameters and the light spot parameters, and to calculate the driving voltage of each dimming band. The dimming band includes a set of multiple bands with different brightness values, and each brightness value band includes a different reference brightness value representing that brightness value band.

[0079] For example, Table 1 below shows the dimming bands. As shown in Table 1, the dimming bands of the display panel in this embodiment include brightness value bands NOR1 to NOR9. For example, the reference brightness value corresponding to brightness value band NOR1 is 1000 nits, and the optimal driving voltage of brightness value band NOR1 is -4.5V. The other brightness value bands are similar. Using this setting, fingerprint unlocking design with different brightness bands can be realized.

[0080]

[0081] Table 1: Different brightness values ​​and driving voltages of the dimming bands

[0082] In an optional embodiment, the dimming band includes a first dimming set and a second dimming set, wherein the first dimming set includes a brightness value band where the reference brightness value is less than the inflection point brightness value; and the second dimming set includes a brightness value band where the reference brightness value is greater than or equal to the inflection point brightness value.

[0083] As shown in Table 1, the first dimming set corresponds to the brightness value band of NOR6 to NOR9, the second dimming set corresponds to the brightness value band of NOR1 to NOR5, and the brightness value band corresponding to the inflection point brightness value of 90 nits is NOR5.

[0084] The dimming sets in this embodiment of the invention correspond to two dimming modes. In the first dimming set, the reference brightness value for each brightness band is less than the inflection point brightness value. For example, the reference brightness value for brightness band NOR8 is 8 nits, which is less than the reference brightness value for brightness band NOR5. In the second dimming set, the reference brightness value for each brightness band is greater than or equal to the inflection point brightness value. For example, the reference brightness value for brightness band NOR5 is 90 nits, which is equal to the reference brightness value for brightness band NOR5. Similarly, the reference brightness value for brightness band NOR2 is 600 nits, which is greater than the reference brightness value for brightness band NOR2.

[0085] In an optional embodiment, the dimming scheme corresponding to the first dimming set is PWM (Pulse Width Modulation) dimming, and the dimming scheme corresponding to the second dimming set is DC dimming. On the basis of realizing the fingerprint unlocking function, different dimming modes are realized by using dimming bands to improve the performance of the display panel.

[0086] In an optional embodiment, as shown in Table 1, the driving voltage corresponding to the brightness value band of the reference brightness value is equal to the driving voltage corresponding to each brightness value band in the first dimming set; the driving voltage corresponding to the brightness value band of the reference brightness value is equal to the driving voltage corresponding to other brightness value bands in the second dimming set.

[0087] Based on the aforementioned embodiments, the driving voltage for fingerprint unlocking differs for different brightness value bands in this embodiment. In this embodiment, the brightness value band corresponding to 90 nits (NOR5) is used as the dividing point for the driving voltage. The driving voltage of the first dimming set is set to be the same as that of the brightness value band corresponding to 90 nits (NOR5). The driving voltage of the brightness value band corresponding to the inflection point brightness value in the second dimming set is set to be different from the driving voltage of other brightness value bands in the second dimming set. This setting can avoid the problem of large voltage range during fingerprint unlocking.

[0088] Based on the design of the brightness value bands and driving voltage in Table 1 of this invention, the fingerprint unlocking control module uses the first unlocking unit and the second unlocking unit to perform fingerprint unlocking at different display brightness values.

[0089] In an optional embodiment, such as Figure 5 As shown, the fingerprint unlocking control module includes a first unlocking unit, which is used to find a brightness value band that matches the display brightness value, and call the driving voltage of the dimming band corresponding to the brightness value band and the gamma value to unlock.

[0090] In this embodiment, the first unlocking unit corresponds to the first judgment result, that is, when the display brightness value is greater than or equal to the preset inflection point brightness value, it directly enters fingerprint unlocking under the brightness value band matched by the current display brightness value. For example, when the display brightness value is 950 nits, the brightness value band matched with it is NOR1 (1000 nits). In this case, according to the first judgment result of the display brightness value judgment module, the first unlocking unit performs fingerprint unlocking based on the driving voltage corresponding to the NOR1 brightness value band calculated by the driving data acquisition unit, such as -4.5V in Table 1, and based on the gamma value.

[0091] In an optional embodiment, such as Figure 5 and Figure 6 As shown, the fingerprint unlocking control module further includes a second unlocking unit, which includes:

[0092] A brightness value matching subunit is used to find a brightness value band that matches the display brightness value based on a second judgment result, wherein the brightness value band is located in the first dimming set;

[0093] A brightness value calibration subunit is used to determine brightness calibration parameters based on the display brightness value, wherein the brightness calibration parameters make the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value.

[0094] The background call subunit is used to utilize brightness calibration parameters to transition the background brightness of display area AA from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value; and

[0095] The second result unlocking subunit is used to call the driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value to unlock.

[0096] In this embodiment of the invention, the second unlocking unit is modularly designed. When the second judgment result is determined, that is, the display brightness value is less than the preset inflection point brightness value, the second unlocking unit is used to load the current display brightness value into the display brightness value corresponding to the inflection point brightness value using the brightness value calibration unit and the background recall unit, and to unlock the display brightness value by driving the display brightness value band corresponding to the inflection point brightness value and using the gamma value.

[0097] Based on the design of the second unlocking unit in this embodiment and the design of the dimming band in the foregoing embodiments, it can be seen that the driving voltage for each brightness value band of the first dimming set is consistent with the driving voltage corresponding to the inflection point brightness value, that is, the ELVSS voltage of NOR9 to NOR5 in Table 1 is the same. Therefore, when the second unlocking unit of this embodiment performs fingerprint unlocking based on the second judgment result, even if it enters the brightness value band corresponding to the higher brightness inflection point brightness value from different first dimming sets, the driving voltage when entering fingerprint unlocking will not have a voltage jump, so there is no problem of background flickering and light spot brightness fluctuation.

[0098] On the other hand, in this embodiment of the invention, the brightness value band corresponding to the inflection point brightness value is the DC dimming band with the lowest brightness value applied in the DC dimming scheme. When the background brightness value is 2 nit, the image displayed on the display panel is the image with the highest grayscale in the DC band. For example, the grayscale span from the brightness value corresponding to NOR5 to 2 nit is smaller than the grayscale span from the brightness value corresponding to NOR1 to 2 nit. Therefore, by selecting the brightness value band corresponding to the inflection point brightness value as the background brightness value before fingerprint unlocking in this embodiment, the grayscale span when the brightness value changes can be reduced, thereby further reducing the background flicker when the background brightness of the display area AA changes from the current display brightness value band to the brightness value band corresponding to the inflection point brightness value from the background call subunit.

[0099] In an optional embodiment, the brightness calibration subunit is further configured to determine the transparency data corresponding to the inflection point brightness value based on the display parameters and the spot parameters; call the reference brightness value matched by the display brightness value as a first calculated value; call the reference brightness value matched by the inflection point brightness value as a second calculated value; and obtain the brightness calibration parameters based on the first calculated value, the second calculated value, and the transparency data.

[0100] The transparency data mentioned in this embodiment is Alpha0. Based on the foregoing discussion, at the same refresh rate, the minimum display brightness of the display panel is 1 nit and the maximum display brightness is 1000 nits. The transparency data value corresponding to 1 nit is 0, and the transparency data value corresponding to 1000 nits is 4095. The display brightness between 1 nit and 1000 nits can be represented by the transparency data value between 0 and 4095, and the transparency data value is an integer.

[0101] Therefore, with the same refresh rate, different brightness values ​​correspond to different transparency data. The brightness calibration subunit is used to calculate the brightness calibration parameters required to reach the inflection point brightness value when transitioning from a display brightness value less than 90 nits to 90 nits. This ensures stable changes in background brightness when the background brightness call subunit calls the background brightness, avoiding issues such as screen flickering and large fluctuations in the optical acquisition environment mentioned in fingerprint unlocking.

[0102] In a specific example, the brightness calibration parameter Alpha gain The following formula is used to calculate:

[0103] Alpha gain =(Target_Lv / Threshold_Lv)^ (1 / 2.2) *Alpha0;

[0104] Where Target_Lv is the first calculated value; Threshold_Lv is the second calculated value; and Alpha0 is the transparency data.

[0105] Band Lv <![CDATA[Alpha gain ]]> NOR5 90 4095 NOR6 89.5 4084 NOR7 30 2483 NOR8 8 1362 NOR9 2 725

[0106] Table 2: Luminance calibration parameters (Alpha) for the NOR5–NOR9 luminance value bands gain Example data with brightness value Lv

[0107] As shown in Table 2, the transparency data Alpha0 is a constant value of 4095. In a specific example, if the display brightness value acquisition module obtains the display brightness value of the display panel as 2 nits, the display brightness value judgment module generates a second judgment result based on the display brightness value of 2 nits, and the second unlocking unit of the fingerprint unlocking module performs fingerprint unlocking according to the second judgment result.

[0108] In a specific example, the second unlocking unit works as follows:

[0109] The brightness value matching subunit is used to find a brightness value band that matches the displayed brightness value of 2 nits based on the second judgment result. For example, the displayed brightness value of 2 nits corresponds to the brightness value band NOR9 in Table 1.

[0110] The brightness calibration subunit uses the displayed brightness value of 2 nits as the first calculated value and the inflection point brightness value of 90 nits to be entered as the second calculated value.

[0111] Using the formula Alpha gain =(Target_Lv / Threshold_Lv)^ (1 / 2.2)*Alpha0 calculates the brightness calibration parameters NOR9Alpha from the current display brightness value of 2 nits (corresponding to the brightness value band NOR9) to the inflection point brightness value of 90 nits (corresponding to the brightness value band NOR5). gain for:

[0112] NOR9Alpha gain =(2 / 90)^ (1 / 2.2) *4095=725.

[0113] The brightness calibration parameters are obtained based on the brightness value calibration subunit.

[0114] Furthermore, the background call subunit uses the brightness calibration parameters to change the background brightness of the display area AA from the current 2-nit display brightness value corresponding to the brightness value band NOR9 to the brightness value band NOR5 corresponding to the 90-nit inflection point brightness value, in order to adjust the background brightness before fingerprint unlocking. The second result unlock subunit calls the driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value to unlock, thereby realizing fingerprint unlocking under low display brightness.

[0115] Based on the foregoing embodiments, in an optional embodiment, the controller further includes a background brightness control module, used to display the fingerprint at the specified brightness value after the fingerprint unlocking control module completes fingerprint unlocking. That is, after the fingerprint unlocking control module performs fingerprint unlocking based on the first and second judgment results, the background brightness control module displays the fingerprint at the current brightness. The difference lies in that, during fingerprint unlocking based on the first judgment result, the background brightness remains unchanged, while during fingerprint unlocking based on the second judgment result, the background brightness is first increased to the inflection point brightness value before fingerprint unlocking, and then reduced from the inflection point brightness value to a lower display brightness value after fingerprint unlocking is completed. This ensures consistent brightness before and after fingerprint unlocking, avoiding flickering on the display panel.

[0116] Based on the above description, the controller proposed in this embodiment of the invention determines the fingerprint unlocking method based on the display brightness value of the display panel. When the display brightness value is greater than or equal to the inflection point brightness value, a first judgment result is generated. According to the first judgment result, the controller directly enters the brightness value band corresponding to the current background brightness for fingerprint unlocking. When the display brightness value is less than the inflection point brightness value, a second judgment result is generated. According to the second judgment result, a brightness calibration parameter is set. The brightness calibration parameter is used to adjust the current background brightness to the brightness value band corresponding to the inflection point brightness value for background call before fingerprint unlocking. Then, after background call, fingerprint unlocking of the fingerprint unlocking area FA is performed. Compared with the prior art, the controller of this embodiment of the invention only uses the same set of gamma values ​​and does not need to occupy data memory. The brightness calibration parameter can reduce the fluctuation of the light spot brightness and the flicker of the fingerprint background brightness during the fingerprint unlocking process, thereby improving the unlocking efficiency and unlocking accuracy of fingerprint unlocking.

[0117] Another embodiment of the present invention provides a fingerprint unlocking method for a display panel, the display panel including a display area AA and a patterned fingerprint unlocking area FA located in the display area AA.

[0118] like Figure 7 As shown, the fingerprint unlocking method of this invention includes:

[0119] S61. Obtain the display brightness value of the display panel;

[0120] S63. Based on the displayed brightness value, determine whether it is greater than or equal to a preset inflection point brightness value. If yes, generate a first judgment result; otherwise, generate a second judgment result.

[0121] S65. Based on the first judgment result and according to the display brightness value, call the corresponding driving voltage and preset gamma value to unlock the fingerprint unlock area.

[0122] or,

[0123] S67. Based on the second judgment result and according to the brightness calibration parameters determined by the display brightness value, call the corresponding driving voltage and preset gamma value to unlock the fingerprint unlock area.

[0124] The fingerprint unlocking method of this invention generates different judgment results based on the current display brightness value of the display panel. According to the first judgment result, the driver data and gamma value are directly called to unlock the fingerprint. According to the second judgment result, the brightness calibration value is called to calibrate and then the driver data and gamma value are called to unlock the fingerprint. This fingerprint unlocking method is implemented using only the same set of gamma values. The brightness calibration parameters can reduce the fluctuation of the light spot brightness and the flicker of the fingerprint background brightness during the fingerprint unlocking process.

[0125] The definition of display brightness value, determination of inflection point brightness value, and acquisition of gamma value in the fingerprint unlocking method of this invention can be found in the controller of the aforementioned embodiment, and the relevant principles and processes can be referenced.

[0126] In an optional embodiment, before obtaining the display brightness value of the display panel, the method further includes:

[0127] The gamma value for fingerprint unlocking is determined based on the display parameters and the light spot parameters;

[0128] Based on the display parameters and the light spot parameters, the display panel is configured with multiple dimming bands. The dimming bands include a set of multiple different brightness value bands, and each brightness value band includes a different reference brightness value representing that brightness value band.

[0129] The driving voltage for each dimming band is calculated based on the display parameters and the light spot parameters.

[0130] In the above steps, multiple dimming bands of the display panel are set based on the display parameters and the light spot parameters, and the driving voltage of each dimming band is calculated, thereby performing... Figure 7 The fingerprint unlocking method shown is used to achieve fingerprint unlocking under multiple different brightness value bands.

[0131] In an optional embodiment, such as Figure 8 As shown, step S65, "based on the first judgment result and calling the corresponding driving voltage according to the display brightness value to perform fingerprint unlocking of the fingerprint unlocking area," further includes:

[0132] S651. Find the brightness value band that matches the displayed brightness value;

[0133] S653. Unlock by calling the driving voltage of the dimming band corresponding to the brightness value band and the gamma value.

[0134] In the steps of this embodiment of the invention, when the display brightness value is greater than or equal to the inflection point brightness value, a first judgment result is generated. Based on the first judgment result, the system directly enters the brightness value band corresponding to the current background brightness to perform fingerprint unlocking, thereby realizing fingerprint unlocking under high brightness.

[0135] Furthermore, in an optional embodiment, such as Figure 9 As shown, step S67, "based on the second judgment result and according to the brightness calibration parameters determined by the display brightness value, calling the corresponding driving voltage to unlock the fingerprint unlocking area," further includes:

[0136] S671. Find a brightness value band that matches the display brightness value, wherein the brightness value band is located in the first dimming set;

[0137] S673. Determine brightness calibration parameters based on the display brightness value, wherein the brightness calibration parameters make the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value.

[0138] S675. Using brightness calibration parameters, the background brightness of the display area is moved from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value.

[0139] S677. Unlock by calling the driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value.

[0140] In the steps of this embodiment of the invention, when the displayed brightness value is less than the inflection point brightness value, a second judgment result is generated. Based on the second judgment result, a brightness calibration parameter is set. The brightness calibration parameter is used to adjust the current background brightness to the brightness value band corresponding to the inflection point brightness value to perform background call before fingerprint unlocking. Then, after the background call, fingerprint unlocking of the fingerprint unlocking area is performed. Compared with the prior art, the controller of this embodiment of the invention only uses the same set of gamma values ​​and does not need to occupy data memory. The brightness calibration parameter can reduce the fluctuation of the light spot brightness and the flicker of the fingerprint background brightness during the fingerprint unlocking process, ensure the consistency of background switching before and after fingerprint unlocking, and improve the unlocking efficiency and unlocking accuracy of fingerprint unlocking.

[0141] In this embodiment, the brightness value band, the corresponding driving voltage of the brightness value band, and the reference brightness value are designed according to the controller in the previous embodiment. The inflection point brightness value is used as the dividing point. Since the driving voltage when the displayed brightness value is less than the inflection point brightness value is the same as the driving voltage corresponding to the inflection point brightness value, this process can eliminate the problems of fingerprint flickering and fingerprint spot brightness fluctuation caused by Elvss voltage crossing.

[0142] In an optional embodiment, step S673, "determining brightness calibration parameters based on the displayed brightness value," further includes:

[0143] S6731. Based on the display parameters and the light spot parameters, determine the transparency data corresponding to the inflection point brightness value;

[0144] S6733. Call the reference brightness value matched by the display brightness value as the first calculated value, and call the reference brightness value matched by the inflection point brightness value as the second calculated value;

[0145] S6735. The brightness calibration parameters are obtained based on the first calculated value, the second calculated value, and the transparency data.

[0146] In this embodiment, the display brightness value is used as the first calculated value, and the brightness value of the inflection point to be entered is used as the second calculated value, using the calculation formula:

[0147] Alpha gain =(Target_Lv / Threshold_Lv)^ (1 / 2.2) *Alpha0;

[0148] The system calculates the brightness calibration parameters from the current display brightness value to the inflection point brightness value to enable fingerprint unlocking, thus achieving fingerprint unlocking under low display brightness.

[0149] In an optional embodiment, the method further includes step S69: after fingerprint unlocking is completed based on the first judgment result and the second judgment result, the display brightness value is used as the background brightness for display.

[0150] In other words, during the fingerprint unlocking process based on the first judgment result, the background brightness remains unchanged. However, during the fingerprint unlocking process based on the second judgment result, the background brightness is first increased to the inflection point brightness value before fingerprint unlocking, and then the background brightness is reduced from the inflection point brightness value to a lower display brightness value after fingerprint unlocking is completed. This ensures that the background brightness is consistent before and after fingerprint unlocking, avoiding the problem of flickering on the display panel.

[0151] It is worth noting that specific embodiments of the fingerprint unlocking method of this invention can be found in the controller of the foregoing embodiments, and will not be repeated here.

[0152] Another embodiment of the present invention provides a display device, which includes the controller and display panel of the above embodiments of the present invention. The display device can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, etc., and this embodiment does not limit it.

[0153] In the description of this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0154] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A controller, characterized in that, Applied to a display panel, the display panel includes a display area and a patterned fingerprint unlocking area. The display panel dims using a first dimming scheme when the display brightness value is greater than or equal to a preset inflection point brightness value, and dims using a second dimming scheme when the display brightness value is less than the preset inflection point brightness value. The controller includes: The display brightness value acquisition module is used to acquire the display brightness value of the display panel; The display brightness value judgment module is used to determine whether the display brightness value is greater than the preset inflection point brightness value. If it is, a first judgment result is generated; otherwise, a second judgment result is generated. The fingerprint unlocking control module is used to unlock the fingerprint unlocking area by calling the corresponding driving voltage based on the first judgment result and the display brightness value, or to unlock the fingerprint unlocking area by calling the corresponding driving voltage based on the second judgment result and the brightness calibration parameter determined by the display brightness value. The controller further includes a drive data acquisition module, which includes: The gamma value calculation unit is used to determine the gamma value for calling the fingerprint unlocking area to unlock the fingerprint based on the display parameters of the display panel and the light spot parameters of the fingerprint unlocking area. A driving voltage calculation unit is used to set multiple dimming bands of the display panel based on the display parameters and the light spot parameters, and to calculate the driving voltage of each dimming band, wherein the dimming band includes a set of multiple different brightness value bands, and each brightness value band includes a different reference brightness value representing that brightness value band. The dimming band includes a first dimming set and a second dimming set, wherein... The first dimming set includes brightness value bands where the reference brightness value is less than the inflection point brightness value; The second dimming set includes brightness value bands whose reference brightness value is greater than or equal to the inflection point brightness value; The reference brightness value is equal to the driving voltage corresponding to the brightness value band of the inflection point brightness value, and is equal to the driving voltage corresponding to each brightness value band in the first dimming set. The driving voltage corresponding to the brightness value band where the reference brightness value is equal to the inflection point brightness value is different from the driving voltage corresponding to other brightness value bands in the second dimming set. The fingerprint unlocking control module includes a second unlocking unit, which includes: A brightness value matching subunit is used to find a brightness value band that matches the display brightness value based on a second judgment result, wherein the brightness value band is located in the first dimming set; A brightness value calibration subunit is used to determine brightness calibration parameters based on the display brightness value, wherein the brightness calibration parameters make the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value. The background call subunit is used to utilize brightness calibration parameters to transition the background brightness of the display area from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value; and The second result unlocking subunit is used to call the driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value to unlock.

2. The controller according to claim 1, characterized in that, The fingerprint unlocking control module includes a first unlocking unit, which is used to find a brightness value band that matches the display brightness value based on a first judgment result, and call the driving voltage of the dimming band corresponding to the brightness value band and the gamma value to unlock.

3. The controller according to claim 1, characterized in that, The brightness calibration subunit is further configured to determine the transparency data corresponding to the inflection point brightness value based on the display parameters and the light spot parameters; call the reference brightness value matched by the display brightness value as the first calculated value; call the reference brightness value matched by the inflection point brightness value as the second calculated value; and obtain the brightness calibration parameters based on the first calculated value, the second calculated value, and the transparency data.

4. The controller according to claim 3, characterized in that, The brightness calibration parameters The following formula is used to calculate: ； in, This is the first calculated value; This is the second calculated value; This is transparency data.

5. A fingerprint unlocking method for a display panel, characterized in that, The display panel includes a display area and a fingerprint unlocking area. The display panel dims using a first dimming scheme when the display brightness value is greater than or equal to a preset inflection point brightness value, and dims using a second dimming scheme when the display brightness value is less than the preset inflection point brightness value. The fingerprint unlocking method includes: Obtain the display brightness value of the display panel; Based on the displayed brightness value, determine whether it is greater than or equal to the preset inflection point brightness value. If yes, generate a first judgment result; otherwise, generate a second judgment result. Fingerprint unlocking of the fingerprint unlocking area is performed based on the first judgment result and the corresponding driving voltage and preset gamma value according to the display brightness value; or, fingerprint unlocking of the fingerprint unlocking area is performed based on the second judgment result and the corresponding driving voltage and preset gamma value according to the brightness calibration parameter determined by the display brightness value. Before obtaining the display brightness value of the display panel, the method further includes: The gamma value for fingerprint unlocking is determined based on the display parameters and the light spot parameters; Based on the display parameters and the light spot parameters, the display panel is configured with multiple dimming bands, each dimming band including a set of multiple different brightness value bands, and each brightness value band including a different reference brightness value representing that brightness value band. The driving voltage for each dimming band is calculated based on the display parameters and the light spot parameters; The dimming band includes a first dimming set and a second dimming set, wherein... The first dimming set includes brightness value bands where the reference brightness value is less than the inflection point brightness value; The second dimming set includes brightness value bands whose reference brightness value is greater than or equal to the inflection point brightness value; The reference brightness value is equal to the driving voltage corresponding to the brightness value band of the inflection point brightness value, and is equal to the driving voltage corresponding to each brightness value band in the first dimming set. The driving voltage corresponding to the brightness value band where the reference brightness value is equal to the inflection point brightness value is different from the driving voltage corresponding to other brightness value bands in the second dimming set. The step of unlocking the fingerprint unlocking area based on the second judgment result and by calling the corresponding driving voltage according to the brightness calibration parameters determined by the display brightness value further includes: Find a brightness value band that matches the display brightness value, the brightness value band being located in the first dimming set; A brightness calibration parameter is determined based on the display brightness value, and the brightness calibration parameter makes the background brightness corresponding to the current display brightness value consistent with the background brightness corresponding to the reference brightness value. Using brightness calibration parameters, the background brightness of the display area is transitioned from the brightness value band corresponding to the current display brightness value to the brightness value band corresponding to the inflection point brightness value; The driving voltage of the dimming band corresponding to the inflection point brightness value and the gamma value are used to unlock the circuit.

6. The method according to claim 5, characterized in that, The step of unlocking the fingerprint unlock area based on the first judgment result and calling the corresponding driving voltage according to the display brightness value further includes: Find the brightness value band that matches the displayed brightness value; The dimming band corresponding to the brightness value band is unlocked by calling the driving voltage and the gamma value.

7. The method according to claim 5, characterized in that, Determining brightness calibration parameters based on the displayed brightness value further includes: Based on the display parameters and the light spot parameters, determine the transparency data corresponding to the inflection point brightness value; The reference brightness value matched by the displayed brightness value is used as the first calculated value, and the reference brightness value matched by the inflection point brightness value is used as the second calculated value; The brightness calibration parameters are obtained based on the first calculated value, the second calculated value, and the transparency data.

8. A display device, characterized in that, The display device includes a controller and a display panel according to any one of claims 1 to 4.

Images