Display device with automatic dimming mechanism and automatic dimming method of display panel of display device

Abstract

The invention discloses an automatic dimming method of a display panel, the display panel is operated in a current brightness interval and has a current brightness value, the automatic dimming method comprises the following steps: acquiring an ambient light brightness value of an environment where the display panel is located, and judging whether the ambient light brightness value exceeds the current brightness interval or not; corresponding to the situation that the ambient light brightness value exceeds the current brightness interval, the method further comprises the step of judging whether the duration of the ambient light brightness value exceeding the current brightness interval reaches a preset duration or not. When the duration time reaches the preset duration time, the method further comprises the step of converting the ambient light brightness value into a target brightness value; adjusting the current brightness value of the display panel to a target brightness value at a preset rate; and adjusting the current brightness interval to the target brightness interval according to the target brightness value, so as to monitor the ambient light brightness value of the environment where the display panel is located according to the target brightness interval.

Description

Technical Field

[0001] The present disclosure relates to a display device and a display panel thereof, and more particularly to a display device with an automatic dimming mechanism and an automatic dimming method for the display panel thereof. Background Art

[0002] When a display panel dims in response to ambient light changes, if the ambient light changes dramatically, the display brightness of the display panel will also change dramatically, which may cause screen flickering and discomfort to the human eye. In addition, if the display brightness of the display panel is adjusted intermittently or non-continuously, it will also affect viewing comfort. Summary of the Invention

[0003] Therefore, the present disclosure provides a display device with an automatic dimming mechanism and an automatic dimming method for its display panel, which can not only smoothly and continuously adjust the display brightness of the display panel, but also has a mechanism that can avoid overly sensitive dimming, thereby reducing the impact of sudden brightness changes on the user's vision and improving visual comfort.

[0004] An embodiment of the present disclosure provides an automatic dimming method for a display panel, comprising obtaining an ambient light brightness value of an environment in which the display panel is located, wherein the display panel operates in a current brightness interval of a plurality of brightness intervals and has a current brightness value; and determining whether the ambient light brightness value exceeds the current brightness interval. In response to the ambient light brightness value exceeding the current brightness interval, the automatic dimming method further comprises determining whether a duration during which the ambient light brightness value exceeds the current brightness interval reaches a predetermined duration. In response to the duration reaching the predetermined duration, the automatic dimming method further comprises converting the ambient light brightness value to a target brightness value of the display panel; adjusting the current brightness value of the display panel to the target brightness value at a predetermined rate; and adjusting the current brightness interval to the target brightness interval based on the target brightness value, thereby monitoring the ambient light brightness value of the environment in which the display panel is located based on the target brightness interval.

[0005] According to an embodiment of the present disclosure, the predetermined duration depends on the number of times the ambient light brightness value exceeds the current brightness range and the frequency at which the ambient light brightness value is sampled.

[0006] According to an embodiment of the present disclosure, in which the current brightness range has a first preset upper limit value and a first preset lower limit value, this automatic dimming method further includes determining whether the upper limit duration of the ambient light brightness value exceeding the first preset upper limit value reaches a preset duration; and determining whether the lower limit duration of the ambient light brightness value exceeding the first preset lower limit value reaches a preset duration.

[0007] According to an embodiment of the present disclosure, the target brightness range has a second preset upper limit value and a second preset lower limit value, and corresponding to the target brightness value being greater than the current brightness value, the difference between the second preset upper limit value and the second preset lower limit value is greater than the difference between the first preset upper limit value and the first preset lower limit value.

[0008] According to an embodiment of the present disclosure, the target brightness range has a second preset upper limit value and a second preset lower limit value, and corresponding to the target brightness value being less than the current brightness value, the difference between the second preset upper limit value and the second preset lower limit value is less than the difference between the first preset upper limit value and the first preset lower limit value.

[0009] According to an embodiment of the present disclosure, converting the ambient light brightness value to the target brightness value of the display panel further includes referring to a brightness mapping conversion table to map the target brightness value to which the ambient light brightness value needs to be converted, wherein the brightness mapping conversion table selectively applies a linear conversion formula, a logarithmic conversion formula, or a multi-stage conversion formula to map the ambient light brightness value to the target brightness value.

[0010] According to an embodiment of the present disclosure, when the difference between the current brightness value and the target brightness value is less than the preset value, the preset rate is the first adjustment rate, and when the difference between the current brightness value and the target brightness value exceeds the preset value, the preset rate changes from the first adjustment rate to the second adjustment rate.

[0011] According to an embodiment of the present disclosure, the preset rate is a changing rate, and the changing rate gradually increases from a first changing rate to a second changing rate, and then gradually decreases from the second changing rate to the first changing rate.

[0012] Another embodiment of the present disclosure is a display device with an automatic dimming mechanism, comprising a display panel, a light sensing device, and a processing unit. The display panel operates in a current brightness interval of a plurality of brightness intervals and has a current brightness value. The light sensing device is configured to sense the ambient light brightness value of the environment in which the display panel is located. The processing unit is coupled to the light sensing device and the display panel, and is configured to receive the ambient light brightness value from the light sensing device, and to determine whether the ambient light brightness value exceeds the current brightness interval of the display panel. In response to the ambient light brightness value exceeding the current brightness interval, the processing unit is further configured to determine whether the duration for which the ambient light brightness value exceeds the current brightness interval reaches a preset duration. In response to the duration reaching the preset duration, the processing unit is further configured to convert the ambient light brightness value into a target brightness value of the display panel; adjust the current brightness value of the display panel to the target brightness value at a preset rate; and adjust the current brightness interval to the target brightness interval based on the target brightness value, so as to monitor the ambient light brightness value of the environment in which the display panel is located based on the target brightness interval.

[0013] According to an embodiment of the present disclosure, the preset duration depends on the number of times the ambient light brightness value exceeds the current brightness range and the frequency at which the light sensing device samples the ambient light brightness value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To make the above and other features, advantages and embodiments of the present disclosure more easily understood, the accompanying drawings are described as follows:

[0015] Figure 1 is a schematic diagram of a display device with an automatic dimming mechanism according to an embodiment of the present disclosure;

[0016] Figure 2 is a flow chart of an automatic dimming method for a display panel according to an embodiment of the present disclosure;

[0017] Figure 3 is a schematic diagram illustrating a current brightness range according to an embodiment of the present disclosure;

[0018] Figure 4 A schematic diagram illustrating that the range difference of each brightness interval is a constant value according to an embodiment of the present disclosure;

[0019] Figure 5 is a schematic diagram illustrating that the range difference of each brightness interval increases as the brightness interval becomes brighter according to an embodiment of the present disclosure;

[0020] Figure 6 is a schematic diagram of a brightness mapping conversion table constructed by applying a linear conversion formula according to an embodiment of the present disclosure;

[0021] Figure 7 is a schematic diagram of a brightness mapping conversion table constructed by applying a logarithmic conversion formula according to an embodiment of the present disclosure;

[0022] Figure 8 is a schematic diagram of a brightness mapping conversion table constructed by applying a multi-stage conversion method according to an embodiment of the present disclosure;

[0023] Figure 9 is a schematic diagram illustrating a preset rate according to an embodiment of the present disclosure;

[0024] Figure 10A is a schematic diagram illustrating a preset rate as a variable rate curve according to an embodiment of the present disclosure;

[0025] Figure 10B is a brightness variation curve diagram when the display brightness of the display panel is adjusted according to the variation rate curve according to an embodiment of the present disclosure;

[0026] Figure 11 A schematic diagram illustrating an automatic dimming method according to an embodiment of the present disclosure for adjusting the display brightness of a display panel to a target state in response to a decrease in the brightness of ambient light;

[0027] Figure 12A schematic diagram illustrating an automatic dimming method according to an embodiment of the present disclosure for adjusting the display brightness of a display panel to a target state in response to an increase in the brightness of ambient light; and

[0028] Figure 13 FIG. 1 is a schematic diagram illustrating an automatic dimming method according to an embodiment of the present disclosure that does not adjust the display brightness of a display panel when the ambient light brightness value changes for a time period that does not exceed a preset duration.

[0029] Wherein, the reference numerals:

[0030] 100: Display device

[0031] 110: Display panel

[0032] 111: unit pixel

[0033] 120: Light sensing device

[0034] 130: Processing unit

[0035] 200: Automatic dimming method

[0036] 210, 220, 230, 240, 250, 260: Steps

[0037] R: Red sub-pixel

[0038] B: Blue sub-pixel

[0039] B1, B2, B3: Brightness change curve

[0040] G: Green sub-pixel

[0041] D1, D3: Upper limit duration

[0042] D2: Lower limit duration

[0043] Lc: Current brightness value

[0044] Ld: preset lower limit value

[0045] Le: ambient light brightness value

[0046] Lt, Lt1, Lt2, Lt3: target brightness values

[0047] Ltp, Ltp1, Ltp2, Ltp3: target display brightness ratio

[0048] Lu: preset upper limit value

[0049] M1, M2, M3: brightness mapping conversion table

[0050] m1: first stage conversion slope

[0051] m2: Second stage conversion slope

[0052] S1, S2, S3: Change rate curve

[0053] T1, T2: brightness range

[0054] Tc: Current brightness range

[0055] Tt: target brightness range

[0056] t1, t2, t3, t4, t5, t6: time points

[0057] V: Preset rate DETAILED DESCRIPTION

[0058] The following disclosure provides many different embodiments or examples for implementing the various features of the disclosure. The embodiments of components and configurations described below are provided as examples only and are not intended to be limiting. Furthermore, for the purposes of simplicity and clarity, the disclosure repeats reference symbols and / or numbers throughout the examples, which in themselves do not limit the relationships between the various embodiments and / or components discussed.

[0059] Please refer to Figure 1 , Figure 1 FIG1 is a schematic diagram of a display device 100 with an automatic dimming mechanism according to an embodiment of the present disclosure. The display device 100 with an automatic dimming mechanism includes a display panel 110, a light sensing device 120, and a processing unit 130. The display panel 110 includes a plurality of unit pixels 111 arranged in rows and columns, and each unit pixel 111 includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. In the embodiment of the present disclosure, the number and arrangement of the red sub-pixels R, green sub-pixels G, and blue sub-pixels B may vary depending on the actual application requirements of the display panel 110, and the present disclosure is not limited thereto.

[0060] The light sensing device 120 is configured to sense the ambient light brightness value Le of the environment surrounding the display panel 110. The light sensing device 120 can be a separate sensing device disposed outside the display panel 110 or a sensing module embedded in the display panel 110, but the present disclosure is not limited thereto. When the light sensing device 120 is disposed separately outside the display panel 110, it is disposed adjacent to the display panel 110 to obtain a more accurate ambient light brightness value Le.

[0061] The processing unit 130 is coupled to the light sensing device 120 and the display panel 110 and is configured to receive an ambient light brightness value Le from the light sensing device 120. When the ambient light brightness value Le exceeds the current brightness interval Tc operated by the display panel 110 for a predetermined duration, the processing unit 130 calculates a target brightness value Lt to which the ambient light brightness value Le should be converted. The processing unit 130 then adjusts the current brightness value Lc of the display panel 110 to the target brightness value Lt at a predetermined rate V and adjusts the current brightness interval Tc to the target brightness interval Tt. The automatic dimming method disclosed herein will be described in detail below and will not be further elaborated upon here.

[0062] The display device 100 with an automatic dimming mechanism disclosed herein has the ability to sense the ambient light brightness value Le and can automatically adjust the display brightness of the display panel 110 in accordance with the ambient light brightness value Le. In order to meet the requirements of human eye comfort, the processing unit 130 is provided with a brightness interval determination mechanism and a preset duration determination mechanism to further determine whether the display panel 110 needs to be dimmed. In this way, the display panel 110 will not be frequently dimmed in response to drastic environmental changes, resulting in excessive dimming sensitivity and discomfort to the human eye. In addition, the processing unit 130 further controls the dimming rate of the display panel 110 to ensure that the display panel 110 is gradually adjusted to the desired target brightness value Lt at a continuous and smooth preset rate V.

[0063] Please refer to Figure 2 , Figure 2 The automatic dimming method 200 for a display panel according to an embodiment of the present disclosure is a flow chart. The automatic dimming method 200 includes steps 210 to 260 and can be applied to Figure 1 The display device 100 and its display panel 110 shown in the figure, or other systems with similar configurations and functions. Figure 1 The display device 100 is shown as an example for illustration.

[0064] The disclosed automatic dimming method 200 divides the brightness that the display panel 110 can display into several brightness intervals, causing the display panel 110 to operate in the corresponding brightness interval based on the detected ambient light brightness value Le. The following steps will describe the dimming process of the display panel 110 from an initial state to a target state. The initial state is when the display panel 110 operates in a current brightness interval Tc based on the current ambient light brightness value Le and has a current brightness value Lc. The target state is when the display panel 110 operates in a target brightness interval Tt based on changes in the current ambient light brightness value Le and has a target brightness value Lt.

[0065] In step 210 , the light sensing device 120 disposed outside the display panel 110 or embedded in the display panel 110 first senses the ambient light brightness value Le of the environment where the display panel 110 is located.

[0066] In step 220, the processing unit 130 determines whether the ambient light brightness value Le exceeds the current brightness interval Tc. Figure 3 As shown, when the display panel 110 has a current brightness value Lc and operates within a current brightness interval Tc, the ambient light brightness value Le detected by the light sensing device 120 must be within the brightness value range corresponding to the current brightness interval Tc, that is, between a preset upper limit Lu of 707 lux and a preset lower limit Ld of 807 lux. When the ambient light brightness value Le fluctuates within the current brightness interval Tc, it is determined that the ambient light brightness value Le does not exceed the current brightness interval Tc, and the process returns to step 210 to continue monitoring the ambient light brightness value Le. If the ambient light brightness value Le fluctuates beyond the current brightness interval Tc, the process proceeds to step 230.

[0067] In step 230, the processing unit 130 further determines whether the duration of the ambient light brightness value Le exceeding the current brightness interval Tc exceeds a preset duration. Figure 3 When the processing unit 130 determines that the upper limit duration of the ambient light brightness value Le exceeding the preset upper limit value Lu exceeds the preset duration, the process proceeds to step 240. Conversely, when the processing unit 130 determines that the upper limit duration of the ambient light brightness value Le exceeding the preset upper limit value Lu does not exceed the preset duration, the processing unit 130 determines that the ambient light brightness value Le is only momentarily or temporarily brightened, and chooses not to proceed to the step of adjusting the display brightness of the display panel 110 and returns to step 210 to continuously monitor the ambient light brightness value Le.

[0068] Similarly, when the processing unit 130 determines that the ambient light brightness value Le exceeds the preset lower limit value Ld for a lower limit duration exceeding the preset duration, the process proceeds to step 240. Conversely, when the processing unit 130 determines that the ambient light brightness value Le exceeds the preset lower limit value Ld for a lower limit duration not exceeding the preset duration, the process determines that the ambient light brightness value Le is only momentarily or temporarily dimmed, and chooses not to proceed to the step of adjusting the display brightness of the display panel 110 and returns to step 210 to continuously monitor the ambient light brightness value Le. It should be understood that Figure 3 The numerical range of the brightness values ​​indicated is for illustrative purposes only and is not intended to limit the setting range of the brightness values ​​of each brightness interval of the present disclosure.

[0069] In the embodiment of the present disclosure, the preset duration depends on the number of times the ambient light brightness value Le exceeds the current brightness interval Tc and the frequency at which the light sensing device 120 samples the ambient light brightness value Le. The setting equation of the preset duration can be expressed as:

[0070] Preset duration

[0071] =(number of times the ambient light brightness value exceeds the current brightness range)

[0072] ×(sampling frequency of the light sensing device).

[0073] For example but not limited to this, assuming that the number of times that the ambient light brightness value Le exceeds the current brightness interval Tc can be less than 400 times, the frequency of the light sensing device 120 sampling the ambient light brightness value Le is once every 10 milliseconds, so the preset duration is designed to be (400)×(10×10 -3 When the ambient light brightness value Le exceeds the preset lower limit value Ld for a duration exceeding 4 seconds, or exceeds the preset upper limit value Lu for a duration exceeding 4 seconds, it is determined that the display brightness of the display panel 110 needs to be adjusted.

[0074] It should be understood that the number of times the ambient light brightness value Le exceeds the current brightness range Tc and the frequency at which the light sensing device 120 samples the ambient light brightness value Le can be adjusted based on actual application requirements and the specifications of the light sensing device 120, and the present disclosure is not limited thereto. In some embodiments, the preset duration of the preset lower limit value Ld can be set to be different from the preset duration of the preset upper limit value Lu. For example, but not limited to this, the preset duration of the preset lower limit value Ld can be set to 4 seconds, and the preset duration of the preset upper limit value Lu can be set to 3 seconds.

[0075] In the embodiment of the present disclosure, the range difference of each brightness range of the display panel 110 can be a constant value, that is, the difference between the preset upper limit Lu and the preset lower limit Ld of each brightness range is a constant value. Figure 4 As shown, the same Figure 3 For example, the current brightness interval Tc has a preset upper limit Lu of 807 lux and a preset lower limit Ld of 707 lux, with a range difference of 100 lux. If the range difference of each brightness interval of the display panel 110 is set to a fixed value, the range difference of each brightness interval (e.g., brightness interval T1 and brightness interval T2) is 100 lux, and the same applies to other brightness intervals not marked with dotted lines.

[0076] In the embodiment of the present disclosure, the range difference of each brightness interval of the display panel 110 may increase as the brightness interval becomes brighter, that is, the difference between the preset upper limit Lu and the preset lower limit Ld of each brightness interval gradually increases. Figure 5 As shown, the same Figure 3 For example, the preset upper limit Lu is 807 lux, the preset lower limit Ld is 707 lux, and the difference between the two is 100 lux. If the range of values ​​in each brightness interval of the display panel 110 increases as the brightness interval becomes brighter, the difference in brightness interval T1 will be less than 100 lux, while the difference in brightness interval T2 will be greater than 100 lux.

[0077] This implementation allows the dimming mechanism to better suit the human eye's needs, taking into account the fact that the human eye is more sensitive to low brightness ranges and less sensitive to high brightness ranges. It should be understood that while the difference between the preset upper limit Lu and the preset lower limit Ld for each brightness range is described as "gradually increasing," in reality, the range difference for each brightness range can be adjusted based on actual application needs or the user's eye preference, as long as the range difference for the high brightness range is greater than the range difference for the low brightness range.

[0078] Please return Figure 2 In step 240, when it is determined that the ambient light brightness value Le exceeds the current brightness interval Tc and the duration of the duration exceeding the current brightness interval Tc exceeds a predetermined duration, step 240 is performed to convert the ambient light brightness value Le to the target brightness value Lt of the display panel 110. Specifically, the conversion between the ambient light brightness value Le and the target brightness value Lt must take into account human eye comfort, user needs, and the specifications and characteristics of the display panel 110. A brightness mapping conversion table between the ambient light brightness value Le and the target brightness value Lt can be pre-built in the memory of the processing unit 130 or stored in an additional memory device.

[0079] In the embodiment of the present disclosure, the brightness mapping conversion table can be selectively constructed by applying a linear conversion method, a logarithmic conversion method, or a multi-stage conversion method to map the ambient light brightness value Le to the target brightness value Lt. These brightness mapping conversion tables M1 to M3 can be collectively constructed in the memory of the processing unit 130 or an additional memory device to select a more appropriate conversion method based on actual application conditions and user needs.

[0080] Figure 6 The brightness mapping conversion table M1 is constructed by applying a linear conversion formula to linearly map the ambient light brightness value Le to the target brightness value Lt1, where the target brightness value Lt1 is expressed as a percentage (%) as a target display brightness ratio Ltp1 (i.e., the target brightness value Lt1 is divided by the maximum brightness value of the display panel 110, and then multiplied by 100%). The target display brightness ratio Ltp1 can be expressed based on the linear conversion formula as follows:

[0081]

[0082] Among them, Lt min is the minimum display brightness ratio (%) of the display panel 110, Lt max is the maximum display brightness ratio (%) of the display panel 110, Le is the ambient light brightness value, Le min is the minimum brightness of the ambient light, Le max is the maximum brightness value of the ambient light. By setting the minimum display brightness ratio Lt of the display panel 110 min and maximum display brightness ratio Lt max , minimum display brightness ratio Lt min The corresponding minimum brightness value of the ambient light Le min , and maximum display brightness ratio Lt max The corresponding maximum brightness value of the ambient light Le max , we can draw the following equation based on the linear transformation: Figure 6 The brightness mapping conversion table M1 is used to satisfy the linear mapping relationship between the ambient light brightness value Le and the target brightness value Lt1.

[0083] Figure 7 The brightness mapping conversion table M2 is constructed by applying a logarithmic conversion formula, and can logarithmically map the ambient light brightness value Le to a target brightness value Lt2, where the target brightness value Lt2 is expressed as a percentage (%) as a target display brightness ratio Ltp2 (i.e., the target brightness value Lt2 is divided by the maximum brightness value of the display panel 110, and then multiplied by 100%). The target display brightness ratio Ltp2 can be expressed based on the logarithmic conversion formula as follows:

[0084] Ltp2=k×ln(Le)+Lt min .

[0085] Among them, Lt min is the minimum display brightness ratio of the display panel 110, Le is the ambient light brightness value, and k is a constant for adjusting the influence of the ambient light brightness value Le. By setting the minimum display brightness ratio Lt of the display panel 110 min , Maximum display brightness ratio Lt max , minimum display brightness ratio Lt min The corresponding minimum brightness value of the ambient light Le min , and maximum display brightness ratio Lt max The corresponding maximum brightness value of the ambient light Le max , we can draw the following equation based on the logarithmic transformation: Figure 7 The brightness mapping conversion table M2 is used to satisfy the logarithmic mapping relationship between the ambient light brightness value Le and the target brightness value Lt2.

[0086] Figure 8The brightness mapping conversion table M3 is constructed by applying a multi-stage conversion formula, which can map the ambient light brightness value Le to the target brightness value Lt3 according to different stages. Figure 8 In the illustrated example, the brightness mapping conversion table M3 has two conversion stages. When the ambient light brightness value Le is between 0 lux and 1000 lux, it corresponds to the first stage conversion slope m1. When the ambient light brightness value Le is greater than 1000 lux, it corresponds to the second stage conversion slope m2. This maps the ambient light brightness value Le to the target brightness value Lt3 according to the different stages. It should be understood that to better meet user needs, the multi-stage conversion method can also have more conversion slopes, and the present disclosure is not limited to this.

[0087] After performing step 240 to obtain the target brightness value Lt to be converted, step 250 is performed to adjust the current brightness value Lc of the display panel 110 to the target brightness value Lt according to the preset rate V. Figure 9 As shown, the target brightness value Lt of the display panel 110 is expressed as a percentage as a target display brightness ratio Ltp (%). If the current display brightness ratio is 25% and the desired target display brightness ratio Ltp is 37%, the preset rate V is set to 0.004% / ms. This means that the display brightness of the display panel 110 will be adjusted at a rate of 0.004% of the display brightness ratio per millisecond until the current display brightness ratio is adjusted from 25% to the target display brightness ratio Ltp of 37%. In the embodiment of the present disclosure, the preset rate V is set to less than or equal to 0.004% / ms, which enables smooth and gradual adjustment of the display brightness of the display panel 110, avoiding excessively rapid dimming that may cause eye discomfort.

[0088] In some embodiments, while taking into account human eye comfort, the preset rate V may vary depending on the magnitude of the required brightness adjustment. For example, if the difference between the current brightness value Lc and the target brightness value Lt is less than a preset value (i.e., the magnitude of the required brightness adjustment is small or within an acceptable range), the preset rate V is a first adjustment rate. If the difference between the current brightness value Lc and the target brightness value Lt exceeds the preset value (i.e., the magnitude of the required brightness adjustment is larger), the preset rate V is changed from the first adjustment rate to a second adjustment rate, thereby increasing the brightness adjustment speed and thereby reducing the time required to reach the target brightness value Lt from the current brightness value Lc.

[0089] In some embodiments, the predetermined rate V of brightness adjustment of the display panel 110 is a varying rate. Figure 10AThree example change rate curves S1 to S3 are drawn, where the change rate curve S1 corresponds to a range where the brightness needs to be adjusted by a larger amplitude, that is, the amplitude of the preset rate change is larger and the brightness adjustment rate is faster; the change rate curve S2 corresponds to a range where the brightness needs to be adjusted by a smaller amplitude, and the change rate curve S3 corresponds to a range where the brightness needs to be adjusted by the smallest amplitude, that is, the amplitude of the preset rate change is smaller and the brightness adjustment rate is slower. It can be found that these change rate curves S1 to S3 all increase from a first change rate (initial rate) to a second change rate (peak rate), and then decrease from the second change rate (peak rate) to the first change rate (initial rate). It should be understood that the initial rate of zero is only an example to show the change curve of the change rate. In fact, the present disclosure does not limit the initial rate to starting from zero.

[0090] As can be seen from the changes in the rate curves S1 to S3, when the display brightness of the display panel 110 is initially adjusted, its adjustment rate will gradually increase. When the brightness of the display panel 110 is almost adjusted to the target brightness value Lt, it can gradually slow down, so that the entire dimming process presents a slow-fast-slow adjustment sequence, thereby improving the comfort of the human eye.

[0091] Figure 10B Brightness change curves B1 to B3 corresponding to change rate curves S1 to S3 are plotted. It can be seen that change rate curve S1 corresponds to a range where the brightness adjustment range is larger (for example, the target display brightness ratio Ltp changes from 0% to 100%). The target display brightness ratio Ltp of brightness change curve B1 changes more significantly due to the faster adjustment rate of change rate curve S1, and the brightness changes gradually, gradually, and gradually as the adjustment rate changes from slow to fast to slow.

[0092] Rate of change curve S3 corresponds to a range where the required brightness adjustment is smaller (for example, when the target display brightness ratio Ltp changes from 50% to 100%). The target display brightness ratio Ltp of brightness change curve B3 changes more slowly due to the slower adjustment rate of rate of change curve S3. The brightness changes similarly follow a slow-fast-slow adjustment rate pattern, with the brightness changing slowly, then sharply, then slowly. The interpretation of brightness change curve B2 is similar to that of brightness change curves B1 and B3, and therefore will not be further explained here.

[0093] Please return Figure 2In step 260, the current brightness interval Tc is adjusted to the target brightness interval Tt based on the target brightness value Lt, so as to monitor the ambient light brightness value Le of the environment in which the display panel 110 is located based on the target brightness interval Tt. Specifically, the target brightness interval Tt also has the aforementioned preset upper limit Lu and preset lower limit Ld. When the current brightness value Lc is adjusted to the target brightness value Lt in response to changes in the ambient light brightness value Le, the current brightness interval Tc must also be adjusted to the target brightness interval Tt, and the process returns to step 210 to re-monitor the ambient light brightness value Le based on the preset upper limit Lu and preset lower limit Ld of the target brightness interval Tt. At this point, the automatic dimming method 200 for a display panel disclosed herein is substantially complete.

[0094] Figure 11 FIG. 2 is a schematic diagram illustrating the automatic dimming method 200 of the present disclosure for adjusting the display brightness of the display panel 110 to a target state in response to a decrease in the ambient light brightness value Le.

[0095] At time t1 , the ambient light brightness value Le becomes darker and exceeds the preset lower limit Ld of the current brightness interval Tc. The processing unit 130 starts to calculate whether the duration of the ambient light brightness value Le exceeding the lower limit of the current brightness interval Tc exceeds the preset duration.

[0096] At time point t2, the duration of the ambient light brightness value Le exceeding the lower limit of the current brightness interval Tc reaches a preset duration, and the processing unit 130 begins to adjust the current brightness value Lc of the display panel 110 to the target brightness value Lt at a preset rate V, and adjusts the current brightness interval Tc to the target brightness interval Tt.

[0097] At time t3, the dimming step reaches stability. At this point, the display brightness of the display panel 110 has been adjusted to the target brightness value Lt, and the current brightness range Tc has been adjusted to the target brightness range Tt. It is worth noting that when the target state is reached, the ambient light brightness value Le is between the preset upper limit Lu and the preset lower limit Ld of the target brightness range Tt. Changes in the ambient light brightness value Le are monitored based on the preset upper limit Lu and the preset lower limit Ld of the target brightness range Tt.

[0098] Figure 12 FIG. 2 is a schematic diagram illustrating the automatic dimming method 200 of the present disclosure for adjusting the display brightness of the display panel 110 to a target state in response to an increase in the ambient light brightness value Le.

[0099] At time t1 , the ambient light brightness value Le becomes brighter than the preset upper limit Lu of the current brightness interval Tc, and the processing unit 130 starts to calculate whether the duration of the ambient light brightness value Le exceeding the upper limit of the current brightness interval Tc exceeds the preset duration.

[0100] At time point t2, the duration that the ambient light brightness value Le exceeds the upper limit of the current brightness interval Tc has reached a preset duration, and the processing unit 130 begins to adjust the current brightness value Lc of the display panel 110 to the target brightness value Lt at a preset rate V, and adjusts the current brightness interval Tc to the target brightness interval Tt.

[0101] At time point t3 , the brightness adjustment step reaches stability. At this time, the display brightness of the display panel 110 has been adjusted to the target brightness value Lt in response to the first brightening of the ambient light brightness value Le, and the current brightness interval Tc has been adjusted to the target brightness interval Tt.

[0102] In the embodiment of the present disclosure, the automatic dimming method 200 may be a continuous monitoring process, wherein the operation from time point t4 to time point t6 is similar to the operation from time point t1 to time point t3, so as to adjust the display brightness of the display panel 110 to a stable target state in response to the second brightening of the ambient light brightness value Le by continuously monitoring the ambient light brightness value Le.

[0103] Figure 13 A schematic diagram illustrates the automatic dimming method 200 of the present disclosure, wherein the display brightness of the display panel 110 is not adjusted in response to the ambient light brightness value Le not exceeding a predetermined duration. It can be seen that although the ambient light brightness value Le exceeds the current brightness interval Tc for a period of time, the upper limit durations of its exceeding the predetermined upper limit Lu of the current brightness interval Tc are D1 and D3, both of which do not reach the predetermined duration. Therefore, the display brightness of the display panel 110 is maintained at the current brightness value Lc, and the ambient light brightness value Le is monitored within the current brightness interval Tc.

[0104] Similarly, the ambient light brightness value Le exceeds the lower limit value Ld of the current brightness interval Tc for a duration D2 that does not reach the preset duration, so the display brightness of the display panel 110 is maintained at the current brightness value Lc, and the ambient light brightness value Le is monitored by the current brightness interval Tc.

[0105] In summary, the disclosed display device with an automatic dimming mechanism and the automatic dimming method for its display panel further determine whether the display panel needs to be dimmed by setting a brightness range determination mechanism and a preset duration determination mechanism. This prevents the display panel from frequently dimming in response to drastic environmental changes, which would cause excessive dimming sensitivity and discomfort to the eyes. A dimming rate control mechanism is also provided to smoothly and continuously adjust the brightness of the display panel, thereby reducing the impact of sudden brightness changes on the user's vision and improving visual comfort.

[0106] Although the present disclosure has been disclosed above with reference to various embodiments, they are not intended to limit the present disclosure. Anyone with ordinary skill in the art may make slight changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the scope of the appended patent applications.

Claims

1. A method for automatically dimming a display panel, characterized in that: Include: Acquiring an ambient light brightness value of an environment in which the display panel is located, wherein the display panel operates in a current brightness interval of a plurality of brightness intervals and has a current brightness value; as well as Determining whether the ambient light brightness value exceeds the current brightness range, and corresponding to the ambient light brightness value exceeding the current brightness range, the automatic dimming method further includes: Determining whether a duration during which the ambient light brightness value exceeds the current brightness range reaches a preset duration, and corresponding to the duration reaching the preset duration, the automatic dimming method further includes: Converting the ambient light brightness value into a target brightness value of the display panel; Adjusting the current brightness value of the display panel to the target brightness value at a predetermined rate; and The current brightness range is adjusted to a target brightness range according to the target brightness value, so as to monitor the ambient light brightness value of the environment where the display panel is located according to the target brightness range.

2. The automatic dimming method according to claim 1, wherein: The preset duration depends on the number of times the ambient light brightness value exceeds the current brightness range and the frequency at which the ambient light brightness value is sampled.

3. The automatic dimming method according to claim 1, wherein: The current brightness range has a first preset upper limit and a first preset lower limit, and the automatic dimming method further includes: Determine whether the ambient light brightness value exceeds the first preset upper limit value for an upper limit duration reaching the preset duration; as well as It is determined whether a lower limit duration during which the ambient light brightness value exceeds the first preset lower limit value reaches the preset duration.

4. The automatic dimming method according to claim 3, wherein: The target brightness range has a second preset upper limit value and a second preset lower limit value, and corresponding to the target brightness value being greater than the current brightness value, a difference between the second preset upper limit value and the second preset lower limit value is greater than a difference between the first preset upper limit value and the first preset lower limit value.

5. The automatic dimming method according to claim 3, wherein: The target brightness range has a second preset upper limit value and a second preset lower limit value, and corresponding to the target brightness value being less than the current brightness value, a difference between the second preset upper limit value and the second preset lower limit value is less than a difference between the first preset upper limit value and the first preset lower limit value.

6. The automatic dimming method according to claim 1, wherein: Converting the ambient light brightness value to the target brightness value of the display panel further comprises: A brightness mapping conversion table is referred to map the target brightness value to which the ambient light brightness value needs to be converted, wherein the brightness mapping conversion table selectively applies a linear conversion formula, a logarithmic conversion formula or a multi-stage conversion formula to map the ambient light brightness value to the target brightness value.

7. The automatic dimming method according to claim 1, wherein: When the difference between the current brightness value and the target brightness value is less than a preset value, the preset rate is a first adjustment rate, and when the difference between the current brightness value and the target brightness value exceeds the preset value, the preset rate changes from the first adjustment rate to a second adjustment rate.

8. The automatic dimming method according to claim 1, wherein: The preset rate is a changing rate, which gradually increases from a first changing rate to a second changing rate, and then gradually decreases from the second changing rate to the first changing rate.

9. A display device with an automatic dimming mechanism, characterized in that: Include: A display panel operating in a current brightness range of a plurality of brightness ranges and having a current brightness value; a light sensing device configured to sense an ambient light brightness value of an environment where the display panel is located; and a processing unit coupled to the light sensing device and the display panel and configured to: receiving the ambient light brightness value from the light sensing device; as well as Determine whether the ambient light brightness value exceeds the current brightness range of the display panel, and corresponding to the ambient light brightness value exceeding the current brightness range, the processing unit is further configured to: Determine whether a duration during which the ambient light brightness value exceeds the current brightness range reaches a preset duration, and corresponding to the duration reaching the preset duration, the processing unit is further configured to: Converting the ambient light brightness value into a target brightness value of the display panel; Adjust the current brightness value of the display panel to the target brightness value at a preset rate; as well as The current brightness range is adjusted to a target brightness range according to the target brightness value, so as to monitor the ambient light brightness value of the environment where the display panel is located according to the target brightness range.

10. The display device according to claim 9, wherein The preset duration depends on the number of times the ambient light brightness value exceeds the current brightness range and the frequency at which the light sensing device samples the ambient light brightness value.

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