CN112669764B - Display brightness uniformity adjusting method - Google Patents
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Abstract
The invention provides a display brightness uniformity type adjusting method, which comprises the steps of obtaining a brightness signal of a display, and generating a signal input instruction according to the brightness signal; based on a parabola-like generation mechanism, transmitting the signal input instruction to the dimming signal generator, and generating an adjusting signal according to the signal input instruction; wherein the adjustment signal comprises a PWM signal or an I2C signal; transmitting the adjustment signal to the backlight controller, determining a brightness value of the display; acquiring rated voltage and rated current of a display, and determining the limit brightness value of the display according to the rated voltage and the rated current based on a pulse modulation mode; wherein the extreme luminance values include a highest luminance value and a lowest luminance value; and comparing the brightness value of the display with the limit brightness value, determining an adjustment brightness difference value, and updating the current brightness value according to the adjustment brightness difference value.
Description
Technical Field
The invention relates to the technical field of display brightness uniformity adjustment, in particular to a display brightness uniformity adjustment method.
Background
At present, the brightness of a display screen in the market is adjusted only from a few orders to a dozen orders, and due to the limitation of technical difficulty, the lowest brightness is about 15nits, so that the adjustment of lower nits cannot be realized. At present, the requirement of adjusting the screen brightness to the lowest limit is very high, but no good implementation scheme is provided due to the technical complexity. For example, some mobile phone readers put out a night mode, the stimulation to human eyes is reduced only by adjusting the background color of the reader, and the reader looks softer only in the reading environment, but still becomes dazzling when leaving the reader, and the problem is not solved fundamentally. There are many demands for general dark environment, which are more prominent in specific environments such as night in space, underground dark environment, closed dark environment, etc., and if the brightness is above 15nits in the absolutely dark environment, the eyes cannot bear the stimulation of the light when watching the environment at a close distance.
Disclosure of Invention
The invention provides a method for adjusting brightness uniformity of a display, which adjusts the optimal brightness of a light string set (a light emitting device based on an LED display technology) based on an external dimming signal (action of adjusting the backlight brightness of the display, dimming for short), and because human eyes are non-linear in sensitivity to the brightness, namely, the sensitivity of brightness change to the human eyes is very small at high brightness, and the sensitivity of the brightness change to the human eyes is very large at low brightness, on the basis of the point, the parabolic form is applied to the dimming signal change on a dimming mechanism, so that the human eyes basically cannot feel the rapid change of the brightness, and the experience effect of the human eyes is improved. The invention provides a limit display technology which can adjust the screen brightness of a handheld device and a mobile terminal to be low to ensure that the screen content can still be clearly seen in the dark environment without interfering the vision of human eyes and greatly reduce the stimulation injury to the human eyes, based on the background, the technology can be widely applied to the consumption field and the military industry, aviation, and outdoor. The invention can effectively protect eyesight from being damaged by strong light in dark environment, simultaneously, the extremely low screen brightness can greatly reduce energy consumption and enhance endurance, can reduce electromagnetic interference and reduce the risk of exposing a target, is mainly used for equipment equipped with an LED display screen, realizes high-precision brightness adjustment, and can identify the content on the LED display screen by human eyes in the extremely dark and extremely bright environment.
The method for adjusting the brightness uniformity of the display is characterized by comprising a dimming signal generator, a backlight controller, a power converter and the display, wherein the dimming signal generator is electrically connected with the backlight controller to generate an adjusting signal; the backlight controller is electrically connected with the power converter; the display is connected with the power converter through a light power supply;
the adjustment signal comprises a PWM signal or an I2C signal;
the extreme luminance values include a highest luminance value and a lowest luminance value;
and 5, comparing the brightness value of the display with the limit brightness value, determining an adjustment brightness difference value, and updating the current brightness value according to the adjustment brightness difference value.
The present invention provides an embodiment, the display further comprising a cathode, an anode, and an LED lamp;
the cathode and the backlight controller are electrically connected in a first series of lamp loops;
the anode and the backlight controller are electrically connected in a second string of lamp tube loops, wherein the backlight controller transmits signals to the power converter;
the cathode and the anode and the LED lamp in the display screen.
The invention provides an embodiment, wherein the step 1 comprises the following steps:
acquiring a brightness signal of the display;
determining a signal frequency according to the brightness signal;
transmitting the brightness signal to a pre-installed signal input device according to the signal frequency, performing noise reduction processing on the signal, and determining a corresponding input signal;
and processing the input signal based on a control system of the dimming signal generator to generate a corresponding signal input instruction.
The invention provides an embodiment, wherein the step 2 comprises the following steps:
transmitting the signal input command to an adjustment signal generator, wherein,
a timer is arranged in the adjusting signal generator and used for recording the input signal pulse at regular time;
determining and recording an input signal pulse of the input signal according to the input signal;
generating a duty ratio parabola-like of a corresponding PWM signal according to the input signal pulse based on a parabola-like generation mechanism;
and determining an adjusting signal according to the duty ratio parabola and the input signal pulse.
The present invention provides an embodiment, where the generating mechanism based on a quasi-parabola generates a duty ratio quasi-parabola of a corresponding PWM signal according to the input signal pulse, including:
calculating the pulse width of the input signal pulse according to the input signal pulse;
determining the duty ratio of the input signal pulse according to the pulse width;
recording, based on the timer, a corresponding input time of the input signal pulse;
acquiring the corresponding relation between the input time and the duty ratio of the input signal pulse;
based on the control system of the dimming signal generator, storing the signal pulse duty ratios and the corresponding input time one by one according to the corresponding relation, and determining a storage result;
and generating a duty ratio parabola-like of the corresponding PWM signal based on a parabola-like generation mechanism according to the storage result.
The invention provides an embodiment, wherein the step 3 comprises the following steps:
acquiring and recording a default brightness value through the backlight controller;
transmitting the adjusting signal to a backlight controller, and determining an adjusting brightness value;
determining a modification brightness value according to the adjustment brightness value;
and modifying the default brightness value according to the modified brightness value, and determining the brightness value of the display.
The invention provides an embodiment, wherein the step 4 comprises:
step 400: acquiring rated voltage and rated current of a display, and determining the maximum brightness Light of the display according to the rated voltage U and the rated current I of the displaymax；
Wherein the LightmaxRepresenting the maximum brightness of the display, Light (S)E) Represents a unit area of SEThe luminance value of the unit area of (a),
the area value representing the display is in the range (S)1，S2) Inner brightness value, μ (y)UI) Representing the pulse width y at UI rating, and the resulting influence coefficient mu (y)UI)，θminRepresenting the range of minimum angles to the rays of the light and the halo.
Step 401: acquiring a pulse signal of the display screen;
sig(t,sig)＝{(t1，sig1)，(t2，sig2)，…,(tn，sign)}
wherein sig (t)i,sigi) Is represented at tiSignal sig received at a timeiI is equal to (1, n), n represents the number of pulse signals sampled in one period, tiRepresenting the i-th time of reception, sigiRepresents tiThe ith signal received at a time; (ii) a
Step 402: determining the pulse width of the pulse according to the pulse signal, and meanwhile, adjusting the pulse width based on a pulse modulation mode to determine a modulation pulse width Y;
wherein Y is the modulation pulse width, T0Represents the start period, alpha represents the modulation index, A represents the amplitude of the pulse signal, xiIs sig (t)1，sig1) The pulses being the pulse width before modulation, TKRepresenting the sampling period of the acquired pulse signal, w representing the modulated phase;
step 403: according to the modulation pulse width, calculating the duty ratio of the modulation pulse width:
wherein p represents the duty cycle of the modulated pulse width;
step 404: when the duty ratio meets a preset threshold value, controlling the voltage and the current, and determining a corresponding working voltage UoAnd an operating current IoDetermining the lowest brightness corresponding to the display;
wherein beta is a preset threshold value, and LightminRepresenting the lowest brightness of the display, Light (S)E) Representative unitArea is SEThe luminance value of the unit area of (a),
the area value representing the display is in the range (S)1，S2) The luminance value of the light source within the luminance range,
representative power is UoIoPulse width Y of time, resulting in a coefficient of influence
θminRepresents the minimum angle range with the light rays and the light rays of the halation;
step 405: determining the limit brightness of the display according to the minimum brightness and the maximum brightness:
wherein light- > max is the brightness value tending to the maximum brightness value, light- > min is the brightness value tending to the minimum brightness value, and limit light is the limit brightness of the display.
The present invention provides an embodiment, wherein the step 5 includes:
obtaining a brightness value and a limit brightness value of a display, comparing the brightness value and the limit brightness value of the display, and determining a brightness difference value;
determining an adjusting brightness difference value according to the fixed brightness difference value based on a user key command;
and determining a brightness adjusting command according to the brightness adjusting difference value, and updating the current brightness value according to the brightness adjusting command.
The present invention provides an embodiment, wherein the user key commands include an up short key command, an up long key command, a down short key command, and a down long key command; wherein,
the upper short key command is used for increasing the brightness when the brightness of the display screen is less than 100%, or keeping the brightness unchanged when the brightness is equal to 100%;
the up-long key command is used for setting the brightness to be 100% when the brightness of the display screen is less than 95% and the brightness percentage is increased automatically, or when the brightness is less than 100% and 95% <;
the up-long key command is used for increasing the brightness percentage when the brightness of the display screen is less than 95%, or setting the brightness to 100% when the brightness is less than 100%.
The downward short key command is used for enabling the brightness of the display screen to be larger than 0%, and the brightness percentage to be reduced automatically, or keeping the current brightness unchanged;
and the down long key command is used for setting the brightness of the display screen to be greater than 5%, and the brightness is reduced by percentage, or setting the current brightness to be 0.
The present invention provides an embodiment, further comprising:
acquiring a historical modification brightness value, judging whether the modification brightness value is equal to the historical modification brightness value according to the historical modification brightness value, and determining a judgment result;
when the results of the determinations are equal to each other,
when the judgment results are not equal, updating the historical modification brightness value and determining an updated brightness value;
initializing the backlight controller, transmitting the adjusted brightness value to the backlight controller, generating an I2C command; wherein,
the I2C command is a set brightness command for transmission over bus I2C line;
generating a corresponding relation graph of the updated brightness value and the adjusting signal based on an adjusting signal generator;
converting the updated brightness value into a PWM signal according to the corresponding relation graph;
judging whether an I2C command is received or not according to the PWM signal to generate a judgment result; wherein,
when the judgment result is that a 12C command is received, acquiring a command for setting brightness, and setting a brightness value according to the command for setting brightness;
and when the judgment result is that the 12C command is not received, acquiring a user key command, and setting a brightness value according to the user key command.
The invention has the beneficial effects that: the technical method provided by the invention can adjust the screen brightness of the handheld device and the mobile terminal to be low to the utmost extent, so that the screen content can still be clearly seen in a dark environment, the vision of human eyes can not be interfered, and the stimulation damage to the human eyes is greatly reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart illustrating a method for adjusting brightness uniformity of a display according to an embodiment of the present invention;
FIG. 2 is a diagram of an apparatus for a method for adjusting brightness uniformity of a display according to an embodiment of the present invention;
fig. 3 is a generated parabola-like graph of a display brightness uniformity adjusting method according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1:
the method for adjusting the brightness uniformity of the display is characterized by comprising a dimming signal generator, a backlight controller, a power converter and the display, wherein the dimming signal generator is connected with the backlight controller; the backlight controller is connected with the power converter; the display is connected with the power converter through a light power supply;
the adjustment signal comprises a PWM signal or an I2C signal;
the extreme luminance values include a highest luminance value and a lowest luminance value;
and 5, comparing the brightness value of the display with the limit brightness value, determining an adjustment brightness difference value, and updating the current brightness value according to the adjustment brightness difference value.
The working principle of the technical scheme is as follows: as shown in fig. 2, the present invention includes a dimming signal generator, a backlight controller, a power converter and a display, wherein the dimming signal generator is connected to the backlight controller; the backlight controller is connected with the power converter; the display is connected with the power converter through a light power supply; as shown in the method flowchart of fig. 1, the present invention determines the limit brightness of the display by obtaining the rated voltage and the rated current of the display, based on the pulse modulation method, and according to the rated voltage and the rated current; wherein the limit brightness includes a highest brightness and a lowest brightness; determining a brightness signal according to the limit brightness, and generating a signal input instruction according to the brightness signal; generating an adjusting signal based on a parabola-like generation mechanism according to the signal input instruction; wherein the adjustment signal comprises a PWM signal or an I2C signal; transmitting the adjusting signal to a backlight controller to determine a brightness value; obtaining previous brightness values, determining a brightness adjustment difference value, storing the brightness values into a preset storage database, and updating the previous brightness values; the cathode and the backlight controller are electrically connected in a first series of lamp loops; the anode and the backlight controller are electrically connected in a second string of lamp tube loops, wherein the backlight controller transmits signals to the power converter; the adjusting signal generator is used for receiving a signal input instruction and transmitting the signal input instruction to the backlight controller to generate an adjusting signal, and the backlight controller is connected with the power converter and used for generating the adjusting signal according to the adjusting signal.
The beneficial effects of the above technical scheme are: the invention is very glaring to the handheld device and various terminal devices, such as mobile phones, tablet computers, notebook computers and the like, even if the screen brightness is adjusted to the lowest level in the dark environment at night, the high-contrast screen light in the dark environment can cause great stimulation and damage to human eyes, and meanwhile, peripheral personnel can be influenced. However, due to the technical complexity and the extremely high development cost, no corresponding technical measures are available to solve the problem. Based on the background, a limit display technology is provided, the screen brightness of the handheld device and the mobile terminal can be adjusted to be low, so that the screen content can still be clearly seen in a dark environment, the vision of human eyes can not be interfered, and stimulation and damage to the human eyes can be reduced. Can effectual protection eyesight not receive the highlight injury in dark surrounds, reduction energy consumption that simultaneously extremely low screen brightness can be very big strengthens the continuation of the journey, and can reduce electromagnetic interference, reduces the risk that exposes the target.
Example 2:
the present invention provides an embodiment, the display further comprising a cathode, an anode, and an LED lamp;
the cathode and the backlight controller are electrically connected in a first series of lamp loops;
the anode and the backlight controller are electrically connected in a second string of lamp tube loops, wherein the backlight controller transmits signals to the power converter;
the cathode and the anode and the LED lamp in the display screen.
The working principle of the technical scheme is as follows: the device comprises a dimming signal generator, a backlight controller, a power converter and a display; the dimming signal generator is connected with the backlight controller, and is used for receiving a signal input instruction, transmitting the signal input instruction to the backlight controller, generating an adjusting signal and transmitting the adjusting signal to the backlight controller; the display is connected with the power converter through a light power supply.
The beneficial effects of the above technical scheme are: the invention has the beneficial effects that the brightness of the display screen on the market is only adjusted from several orders to dozens of orders, and the lowest brightness is about 15nits due to the limitation of technical difficulty, so that the adjustment of lower nits cannot be realized. At present, the requirement that the screen brightness can be adjusted to be extremely low is very high, but no good implementation scheme exists due to the technical complexity, for example, some mobile phone readers put out a night mode, the stimulation to human eyes is reduced only by adjusting the background color of the readers, the mobile phone readers look softer only in the reading environment, but leave the readers and still become dazzling, and the problem is not solved fundamentally. The invention can be applied to various products containing display screens, such as consumer mobile phones, tablet computers, notebook computers, desktop computers and the like, even electronic flight terminals, vehicle-mounted computers, deep well operation terminals and the like in industry in a large scale by realizing a display technology with extreme brightness, thereby solving the blank problem in the industry at present and realizing extremely high industrial value.
Example 3:
the invention provides an embodiment, wherein the step 1 comprises the following steps:
acquiring a brightness signal of the display;
determining a signal frequency according to the brightness signal;
transmitting the brightness signal to a pre-installed signal input device according to the signal frequency, performing noise reduction processing on the signal, and determining a corresponding input signal;
and processing the input signal based on a control system of the dimming signal generator to generate a corresponding signal input instruction.
The working principle of the technical scheme is as follows: determining a brightness range according to the limit brightness, and determining a brightness signal of the display screen according to the brightness range; determining a signal frequency according to the brightness signal; and transmitting the brightness signal to a pre-installed signal input device according to the signal frequency to generate a corresponding signal input instruction.
The beneficial effects of the above technical scheme are: the invention provides a beneficial effect, the dimming signal generator has a default brightness signal to the backlight controller, the dimming signal generator receives the dimming signal sent by the signal output device in the figure to determine whether the backlight is increased or decreased, the signal generally adopts a pulse signal, the dimming signal generator changes the dimming signal on the basis of the current brightness after receiving an instruction, and the dimming signal modulates the signal according to a parabola-like mechanism to obtain the default brightness signal; acquiring a dimming signal, wherein the dimming signal is received by the dimming signal and sent to a backlight controller to determine a sending signal; the backlight controller changes the current power supply of the lamp tube according to the sending signal and determines the lowest brightness; the dimming signal can be a pulse signal or an I2C bus signal, and the backlight controller changes the power supply current of the lamp tube according to the incoming dimming signal, so as to adjust the backlight to change the uniformity of the backlight.
Example 4:
the invention provides an embodiment, wherein the step 2 comprises the following steps:
transmitting the signal input command to an adjustment signal generator, wherein,
a timer is arranged in the adjusting signal generator and used for recording the input signal pulse at regular time;
determining and recording an input signal pulse of the input signal according to the input signal;
generating a duty ratio parabola-like of a corresponding PWM signal according to the input signal pulse based on a parabola-like generation mechanism;
and determining an adjusting signal according to the duty ratio parabola and the input signal pulse.
The working principle of the technical scheme is as follows: the invention determines whether the backlight is increased or decreased by transmitting the signal input instruction to the adjusting signal generator, the light signal generator receives a dimming signal sent by a signal output device in the figure, and the signal is generally adjusted by adopting a pulse signal so as to determine an input signal; wherein the input signal refers to an input PWM signal or an I2C signal; a timer is arranged in the adjusting signal generator and used for recording the input signal pulse at regular time; determining and recording an input signal pulse of the input signal according to the input signal; and generating a duty ratio parabola of the corresponding PWM signal according to the input signal pulse.
The beneficial effects of the above technical scheme are: the invention provides the so-called ultra-display, namely the limit of the screen brightness of the display, including the maximum brightness and the minimum brightness, wherein the maximum brightness is the maximum brightness supported by the display, and the maximum brightness has no technical difficulty and can be realized by meeting the rated voltage and current of the backlight of the display. The minimum brightness is not a concept of the brightness of the display, but the minimum screen brightness that the human eye can recognize in an environment close to absolute darkness.
As shown in fig. 3, the parabola-like algorithm generates a graph, in an embodiment of the present invention, the super-apparent brightness is about 0.5cd/m2, and in addition, the brightness adjusting signal generally adopts a pulse modulation mode, i.e., the pulse width of the pulse is changed, according to the formula, the duty ratio of the pulse needs to reach 0.0001% to realize the minimum brightness adjustment of 0.5cd/m2, so the invention needs a signal generator with at least 13bit storage unit to meet the requirement.
Example 5:
the present invention provides an embodiment, where the generating mechanism based on a quasi-parabola generates a duty ratio quasi-parabola of a corresponding PWM signal according to the input signal pulse, including:
calculating the pulse width of the input signal pulse according to the input signal pulse;
determining the duty ratio of the input signal pulse according to the pulse width;
recording, based on the timer, a corresponding input time of the input signal pulse;
acquiring the corresponding relation between the input time and the duty ratio of the input signal pulse;
based on the control system of the dimming signal generator, storing the signal pulse duty ratios and the corresponding input time one by one according to the corresponding relation, and determining a storage result;
and generating a duty ratio parabola-like of the corresponding PWM signal based on a parabola-like generation mechanism according to the storage result.
The working principle of the technical scheme is as follows: the invention applies a parabola-like form to the change of the dimming signal on the dimming mechanism, the dimming signal generator outputs a corresponding PWM signal or I2C signal to be transmitted to the backlight controller according to the signal input instruction (signal output), the part can be generated by software or realized by hardware, and the pulse duty ratio of the input signal is calculated through the input signal pulse; recording, based on the timer, a corresponding input time of the input signal pulse; acquiring the corresponding relation between the input time and the duty ratio of the input signal pulse; based on the control system of the dimming signal generator, storing the signal pulse duty ratios and the corresponding input time one by one according to the corresponding relation, and determining a storage result; and generating a duty ratio parabola-like of the corresponding PWM signal according to the storage result and a parabola-like generation mechanism.
The beneficial effects of the above technical scheme are: the invention provides a new method of brightness uniformity display technology, which adjusts the optimal brightness of a light string set (based on a light emitting device of LED display technology) based on an external dimming signal (action of adjusting the backlight brightness of a display, dimming for short), because the sensitivity of human eyes to the brightness is nonlinear, namely the sensitivity of brightness change to human eyes is very small at high brightness, and the sensitivity of the brightness change to human eyes is very large at low brightness, based on the point, the change of the dimming signal is in a parabola-like form on a dimming mechanism, a dimming signal generator outputs a corresponding PWM signal or an I2C signal to a backlight controller according to a signal input instruction (signal output), the part can be generated by software or realized by hardware, the invention adopts software to realize that the output is the PWM signal for explanation, the dimming signal generator can realize the output according to the input instruction, the duty ratio of the PWM signal is output by a parabola-like algorithm to realize the effect of brightness adjustment uniformity, so that human eyes basically cannot feel the rapid change of brightness, and the experience effect of the human eyes is improved.
Example 6:
the invention provides an embodiment, wherein the step 3 comprises the following steps:
acquiring and recording a default brightness value through the backlight controller;
transmitting the adjusting signal to a backlight controller, and determining an adjusting brightness value;
determining a modification brightness value according to the adjustment brightness value;
and modifying the default brightness value according to the modified brightness value, and determining the brightness value of the display.
The working principle of the technical scheme is as follows: the invention is based on the backlight controller, and obtains and records a default brightness value; transmitting the adjusting signal to a backlight controller, and determining an adjusting brightness value; determining a modification brightness value according to the adjustment brightness value; and determining the brightness value of the display according to the default brightness value, the adjusted brightness value and the modified brightness value.
The beneficial effects of the above technical scheme are: the brightness adjustment data of the display screen is determined by calculating the brightness value.
Example 7:
the invention provides an embodiment, wherein the step 4 comprises the following steps:
step 400: acquiring rated voltage and rated current of a display, and determining the maximum brightness Light of the display according to the rated voltage U and the rated current I of the displaymax；
Wherein the LightmaxRepresenting the maximum brightness of the display, Light (S)E) Represents a unit area of SEThe luminance value of the unit area of (a),
the area value representing the display is in the range (S)1，S2) Inner brightness value, μ (y)UI) Representing the pulse width y at UI rating, and the resulting influence coefficient mu (y)UI)，θminRepresenting the range of minimum angles to the rays of the light and the halo.
Step 401: acquiring a pulse signal of the display screen;
sig(t,sig)＝{(t1，sig1)，(t2，sig2)，…,(tn，sign)}
wherein sig (t)i,sigi) Is represented at tiSignal sig received at a timeiI is equal to (1, n), n represents the number of pulse signals sampled in one period, tiRepresenting the i-th time of reception, sigiRepresents tiThe ith signal received at a time;
step 402: determining the pulse width of the pulse according to the pulse signal, and meanwhile, adjusting the pulse width based on a pulse modulation mode to determine a modulation pulse width Y;
wherein Y is the modulation pulse width, T0Represents the start period, alpha represents the modulation index, A represents the amplitude of the pulse signal, xiIs sig (t)1，sig1) The pulses being the pulse width before modulation, TKRepresenting the sampling period of the acquired pulse signal, w representing the modulated phase;
step 403: according to the modulation pulse width, calculating the duty ratio of the modulation pulse width:
wherein p represents the duty cycle of the modulated pulse width;
step 404: when the duty ratio meets a preset threshold value, controlling the voltage and the current, and determining a corresponding working voltage UoAnd an operating current IoDetermining the lowest brightness corresponding to the display;
wherein beta is a preset threshold value, and LightminRepresenting the lowest brightness of the display, Light (S)E) Represents a unit area of SEThe luminance value of the unit area of (a),
the area value representing the display is in the range (S)1，S2) The luminance value of the light source within the luminance range,
representative power is UoIoPulse width Y of time, generatedCoefficient of influence
θminRepresents the minimum angle range with the light rays and the light rays of the halation;
step 405: determining the limit brightness of the display according to the minimum brightness and the maximum brightness:
wherein light- > max is the brightness value tending to the maximum brightness value, light- > min is the brightness value tending to the minimum brightness value, and limit light is the limit brightness of the display.
The working principle of the technical scheme is as follows: the method comprises the steps of obtaining the rated voltage U and the rated current I of the display, and determining the maximum brightness Light of the display according to the rated voltage U and the rated current I of the displaymax(ii) a Acquiring pulse signal sig of display screeni(ii) a According to the pulse signal sigiDetermining the pulse width Y of the pulse; based on a pulse modulation mode, adjusting the pulse width and determining the duty ratio of the pulse width; when the duty ratio p<Beta satisfies a preset threshold value, and determines the minimum brightness limlight-＞minlight; according to the minimum brightness limlight-＞minlight and maximum luminance
Determining a limit brightness limit light of the display.
The beneficial effects of the above technical scheme are: the invention determines the lowest brightness and the highest brightness of the display by acquiring the limit brightness value of the display, thereby controlling the frequency range of the pulse signal.
Example 8:
the present invention provides an embodiment, wherein the step 5 includes:
obtaining a brightness value and a limit brightness value of a display, comparing the brightness value and the limit brightness value of the display, and determining a brightness difference value;
determining an adjusting brightness difference value according to the fixed brightness difference value based on a user key command;
and determining a brightness adjusting command according to the brightness adjusting difference value, and updating the current brightness value according to the brightness adjusting command.
The working principle of the technical scheme is as follows: the brightness difference value is determined by obtaining the brightness value and the limit brightness value of the display and comparing the brightness value and the limit brightness value of the display; determining an adjusting brightness difference value according to the fixed brightness difference value based on a user key command; and determining a brightness adjusting command according to the brightness adjusting difference value, and updating the current brightness value according to the brightness adjusting command.
The beneficial effects of the above technical scheme are: according to the invention, the current brightness value is updated, so that the visual experience of the user is better, and the stimulation and damage to eyes are reduced.
Example 9:
the present invention provides an embodiment, wherein the user key commands include an up short key command, an up long key command, a down short key command, and a down long key command; wherein,
the upper short key command is used for increasing the brightness when the brightness of the display screen is less than 100%, or keeping the brightness unchanged when the brightness is equal to 100%;
the up-long key command is used for setting the brightness to be 100% when the brightness of the display screen is less than 95% and the brightness percentage is increased automatically, or when the brightness is less than 100% and 95% <;
the up-long key command is used for increasing the brightness percentage when the brightness of the display screen is less than 95%, or setting the brightness to 100% when the brightness is less than 100%.
The downward short key command is used for enabling the brightness of the display screen to be larger than 0%, and the brightness percentage to be reduced automatically, or keeping the current brightness unchanged;
and the down long key command is used for setting the brightness of the display screen to be greater than 5%, and the brightness is reduced by percentage, or setting the current brightness to be 0.
The working principle of the technical scheme is as follows: according to the invention, when the judging result is that the 12C command is not received, a user key command is obtained; the user key commands comprise an up short key command, an up long key command, a down short key command and a down long key command; the upper short key command is used for increasing the brightness when the brightness of the display screen is less than 100%, or keeping the brightness unchanged when the brightness is equal to 100%; the up-long key command is used for setting the brightness to be 100% when the brightness of the display screen is less than 95% and the brightness percentage is increased automatically, or when the brightness is less than 100% and 95% <; the up-long key command is used for increasing the brightness percentage when the brightness of the display screen is less than 95%, or setting the brightness to 100% when the brightness is less than 100%. The downward short key command is used for enabling the brightness of the display screen to be larger than 0%, and the brightness percentage to be reduced automatically, or keeping the current brightness unchanged; and the down long key command is used for setting the brightness of the display screen to be greater than 5%, and the brightness is reduced by percentage, or setting the current brightness to be 0.
The beneficial effects of the above technical scheme are: the invention realizes the requirements of the user by carrying out different operations through different commands.
Example 10:
the present invention provides an embodiment, further comprising:
acquiring a historical modification brightness value, judging whether the modification brightness value is equal to the historical modification brightness value according to the historical modification brightness value, and determining a judgment result;
when the results of the determinations are equal to each other,
when the judgment results are not equal, updating the historical modification brightness value and determining an updated brightness value;
initializing the backlight controller, transmitting the adjusted brightness value to the backlight controller, generating an I2C command; wherein,
the I2C command is a set brightness command for transmission over bus I2C line;
generating a corresponding relation graph of the updated brightness value and the adjusting signal based on an adjusting signal generator;
converting the updated brightness value into a PWM signal according to the corresponding relation graph;
judging whether an I2C command is received or not according to the PWM signal to generate a judgment result; wherein,
when the judgment result is that a 12C command is received, acquiring a command for setting brightness, and setting a brightness value according to the command for setting brightness;
and when the judgment result is that the 12C command is not received, acquiring a user key command, and setting a brightness value according to the user key command.
The working principle of the technical scheme is as follows: the method comprises the steps of obtaining a historical modification brightness value, judging whether the modification brightness value is equal to the historical modification brightness value according to the historical modification brightness value, and determining a judgment result; when the judgment results are equal, when the judgment results are not equal, updating the historical modification brightness value, and determining an updated brightness value; initializing the backlight controller, transmitting the adjusted brightness value to the backlight controller, generating an I2C command; wherein the I2C command is for a set brightness command transmitted on bus I2C line; generating a corresponding relation graph of the updated brightness value and the adjusting signal based on an adjusting signal generator; converting the updated brightness value into a PWM signal according to the corresponding relation graph; judging whether an I2C command is received or not according to the PWM signal to generate a judgment result; when the judgment result is that a 12C command is received, acquiring a command for setting brightness, and setting a brightness value according to the command for setting brightness; and when the judgment result is that the 12C command is not received, acquiring a user key command, and setting a brightness value according to the user key command.
The beneficial effects of the above technical scheme are: the invention determines different command requirements through different instructions, adjusts the brightness value according to the requirements of customers and generates PWM signals.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A display brightness uniformity type adjusting method is characterized by comprising a dimming signal generator, a backlight controller, a power converter and a display; wherein,
the dimming signal generator is electrically connected with the backlight controller, the backlight controller is electrically connected with the power converter, and the display is connected with the power converter through a lamplight power supply;
the method comprises the following steps:
step 1, acquiring a brightness signal of the display, and generating a signal input instruction according to the brightness signal;
step 2, based on a parabola-like generation mechanism, transmitting the signal input instruction to the dimming signal generator, and generating an adjusting signal according to the signal input instruction; wherein,
the adjustment signal comprises a PWM signal or an I2C signal;
step 3, transmitting the adjusting signal to the backlight controller, and determining the brightness value of the display;
step 4, obtaining rated voltage and rated current of the display, and determining the limit brightness value of the display according to the rated voltage and the rated current based on a pulse modulation mode; wherein,
the extreme luminance values include a highest luminance value and a lowest luminance value;
step 5, comparing the brightness value of the display with a limit brightness value, determining an adjustment brightness difference value, and updating the current brightness value according to the adjustment brightness difference value;
the step 4 comprises the following steps:
step 400: acquiring rated voltage and rated current of a display, and determining the maximum brightness Light of the display according to the rated voltage U and the rated current I of the displaymax；
Wherein the LightmaxRepresenting the maximum brightness of the display, Light (S)E) Represents a unit area of SEE represents a unit area,
the area value representing the display is in the range (S)1，S2) Inner brightness value, μ (y)UI) Representing the pulse width y at UI rating, and the resulting influence coefficient mu (y)UI)，θminRepresenting the range of minimum angles to the rays of the light and the halo.
Step 401: acquiring a pulse signal of the display screen;
sig(t,sig)＝{(t1，sig1)，(t2，sig2)，…,(tn，sign)}
wherein sig (t)i,sigi) Is represented at tiSignal sig received at a timeiI is equal to (1, n), n represents the number of pulse signals sampled in one period, tiRepresenting the i-th time of reception, sigiRepresents tiThe ith signal received at a time;
step 402: determining the pulse width of the pulse according to the pulse signal, and meanwhile, adjusting the pulse width based on a pulse modulation mode to determine a modulation pulse width Y;
wherein Y is the modulation pulse width, T0Represents the start period, alpha represents the modulation index, A represents the amplitude of the pulse signal, xiIs sig (t)1，sig1) The pulses being the pulse width before modulation, TKRepresenting the sampling period of the acquired pulse signal, w representing the modulated phase;
step 403: according to the modulation pulse width, calculating the duty ratio of the modulation pulse width:
wherein p represents the duty cycle of the modulated pulse width;
step 404: when the duty ratio meets a preset threshold value, controlling the voltage and the current, and determining a corresponding working voltage UoAnd an operating current IoDetermining the lowest brightness corresponding to the display;
wherein beta is a preset threshold value, and LightminRepresenting the lowest brightness of the display, Light (S)E) Represents a unit area of SEThe luminance value of the unit area of (a),
the area value representing the display is in the range (S)1，S2) The luminance value of the light source within the luminance range,
representative power is UoIoPulse width Y of time, resulting in a coefficient of influence
θminRepresents the minimum angle range with the light rays and the light rays of the halation;
step 405: determining the limit brightness of the display according to the minimum brightness and the maximum brightness:
wherein light- > max is the brightness value tending to the maximum brightness value, light- > min is the brightness value tending to the minimum brightness value, and limit light is the limit brightness of the display.
2. The method of claim 1, wherein the display further comprises a cathode, an anode and an LED lamp;
the cathode and the backlight controller are electrically connected in a first series of lamp loops;
the anode and the backlight controller are electrically connected in a second string of lamp tube loops, wherein the backlight controller transmits signals to the power converter;
the cathode and the anode and the LED lamp in the display screen.
3. The method as claimed in claim 1, wherein the step 1 comprises:
acquiring a brightness signal of the display;
determining a signal frequency according to the brightness signal;
transmitting the brightness signal to a pre-installed signal input device according to the signal frequency, performing noise reduction processing on the signal, and determining a corresponding input signal;
and processing the input signal based on a control system of the dimming signal generator to generate a corresponding signal input instruction.
4. The method as claimed in claim 1, wherein said step 2 comprises:
transmitting the signal input command to an adjustment signal generator, wherein,
a timer is arranged in the adjusting signal generator and used for recording the input signal pulse at regular time;
determining and recording an input signal pulse of the input signal according to the input signal;
generating a duty ratio parabola-like of a corresponding PWM signal according to the input signal pulse based on a parabola-like generation mechanism;
and determining an adjusting signal according to the duty ratio parabola and the input signal pulse.
5. The method as claimed in claim 4, wherein the generating of the duty ratio parabola-like of the corresponding PWM signal according to the input signal pulse based on the parabola-like generating mechanism comprises:
calculating the pulse width of the input signal pulse according to the input signal pulse;
determining the duty ratio of the input signal pulse according to the pulse width;
recording, based on the timer, a corresponding input time of the input signal pulse;
acquiring the corresponding relation between the input time and the duty ratio of the input signal pulse;
according to the corresponding relation, the signal pulse duty ratio and the corresponding input time are stored one by one through a control system of the dimming signal generator, and a storage result is determined;
and generating a duty ratio parabola-like of the corresponding PWM signal based on a parabola-like generation mechanism according to the storage result.
6. The method as claimed in claim 1, wherein said step 3 comprises:
acquiring and recording a default brightness value through the backlight controller;
transmitting the adjusting signal to a backlight controller, and determining an adjusting brightness value;
determining a modification brightness value according to the adjustment brightness value;
and modifying the default brightness value according to the modified brightness value, and determining the brightness value of the display.
7. The method as claimed in claim 1, wherein said step 5 comprises:
obtaining a brightness value and a limit brightness value of a display, comparing the brightness value and the limit brightness value of the display, and determining a brightness difference value;
determining an adjusting brightness difference value according to the fixed brightness difference value based on a user key command;
and determining a brightness adjusting command according to the brightness adjusting difference value, and updating the current brightness value according to the brightness adjusting command.
8. The method as claimed in claim 7, wherein the user's key commands comprise an up short key command, an up long key command, a down short key command and a down long key command, wherein,
the upper short key command is used for increasing the brightness when the brightness of the display screen is less than 100%, or keeping the brightness unchanged when the brightness is equal to 100%;
the up-long key command is used for setting the brightness to be 100% when the brightness of the display screen is less than 95% and the brightness percentage is increased automatically, or when the brightness is less than 100% and 95% <;
the up-long key command is used for setting the brightness to be 100% when the brightness of the display screen is less than 95% and the brightness percentage is increased, or when the brightness is less than 100% and 95%;
the downward short key command is used for enabling the brightness of the display screen to be larger than 0%, and the brightness percentage to be reduced automatically, or keeping the current brightness unchanged;
and the down long key command is used for setting the brightness of the display screen to be greater than 5%, and the brightness is reduced by percentage, or setting the current brightness to be 0.
9. The method of claim 1, wherein the method further comprises:
acquiring a historical modification brightness value, judging whether the modification brightness value is equal to the historical modification brightness value according to the historical modification brightness value, and determining a judgment result;
when the results of the determinations are equal to each other,
when the judgment results are not equal, updating the historical modification brightness value and determining an updated brightness value;
initializing the backlight controller, transmitting the adjusted brightness value to the backlight controller, generating an I2C command; wherein,
the I2C command is a set brightness command for transmission over bus I2C line;
generating a corresponding relation graph of the updated brightness value and the adjusting signal based on an adjusting signal generator;
converting the updated brightness value into a PWM signal according to the corresponding relation graph;
judging whether an I2C command is received or not according to the PWM signal to generate a judgment result; wherein,
when the judgment result is that an I2C command is received, acquiring a command for setting brightness, and setting a brightness value according to the command for setting brightness;
and when the judgment result is that the I2C command is not received, acquiring a user key command, and setting a brightness value according to the user key command.
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| CN114281291A (en) * | 2021-12-28 | 2022-04-05 | 海信视像科技股份有限公司 | Display device, control device and low-power prompting method of control device |
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