JP2023125504A - Head-up display device - Google Patents

Abstract

To provide a head-up display device which offers improved display quality when re-displaying images.SOLUTION: A head-up display device 100 configured to output display light L to a windshield 201 is provided, comprising a light source 18a for outputting illumination light, a display 14 configured to output display light L when irradiated with the illumination light, and a drive control unit configured to perform driving operation for turning on and off the light source 18a according to an entered requested brightness signal Sa.SELECTED DRAWING: Figure 1

Description

The present invention relates to a head-up display device.

For example, the head-up display device described in Patent Document 1 includes an LED (Light Emitting Diode), a microcomputer that outputs a first PWM signal and obtains the cathode voltage of the LED, and a second PWM signal that receives the first PWM signal from the microcomputer. The driver includes a driver that lights up the LED by outputting a second PWM signal obtained by boosting the first PWM signal to the LED.

International Publication No. 2020/235683

The inventor discovered for the first time that in such a head-up display device, there is room for improvement in improving the display quality when the head-up display device is turned on again (re-displayed) from a temporarily turned off (non-displayed) state.

An object of the present invention is to address the above-mentioned problems and provide a head-up display device that improves the display quality upon redisplay.

In order to achieve the above object, a head-up display device according to the present invention includes:
A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input signal;
Equipped with
The drive control section performs a delay operation of delaying lighting by a first period when switching the light source from off to on.

In another aspect, the head-up display device according to the present invention includes:
A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input control signal;
Equipped with
When switching the light source from off to on at a first brightness, the drive control section performs a buffering operation in which the light source is turned on at a second brightness brighter than the first brightness and then turned on at the first brightness.

In another aspect, the head-up display device according to the present invention includes:
A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that drives the light source according to an input control signal;
a transformation circuit that transforms input power and supplies the transformed power to the drive control unit or the light source;
Equipped with
The drive control section includes a discharge circuit that discharges charge from a power supply line that supplies power to the light source when the light source is switched from a lit state to an off state.

In another aspect, the head-up display device according to the present invention includes:
A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input control signal;
Equipped with
The drive control section includes:
driving and operating the light source by changing a pulse width modulation signal and a current value;
If the brightness at which the on-duty ratio of the pulse width modulation signal is smaller than a predetermined value is defined as the third brightness, then when switching the light source from off to on at the third brightness, the on-duty ratio of the pulse width modulation signal is set to normal. A buffering operation is performed to reduce the current value compared to normal while increasing the current value.

FIG. 1 is a schematic diagram of a vehicle equipped with a head-up display device 100 according to a first embodiment. FIG. 1 is a schematic diagram of a head-up display device 100 according to a first embodiment. FIG. 2 is a block diagram of head-up display devices 100, 101, and 103. 1 is a block diagram of a head-up display device 102. FIG.

An embodiment of a head-up display device according to the present invention will be described with reference to the drawings.

[First embodiment]
1-1. Explanation of configuration 1-2. Description of behavior 1-3. Modification [Second embodiment]
2-1. Explanation of behavior 2-2. Modification [Third embodiment]
3-1. Explanation of configuration 3-2. Description of behavior [Fourth embodiment]
[Modified example]

[First embodiment]
<1-1. Configuration explanation>
As shown in FIG. 1, head-up display device 100 is installed within the dashboard of vehicle 200. The head-up display device 100 emits display light L representing an image toward a windshield 201, which is an example of a projected member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200). Thereby, the virtual image V is displayed so as to be visible to the viewer 1.

As shown in FIG. 2, the head-up display device 100 includes a display section 10, a plane mirror 20, a concave mirror 30, a housing 60, and a control section 70.

The display unit 10 emits display light L representing an image under the control of the control unit 70. The display unit 10 includes a display 14 and a lighting device 18.

The plane mirror 20 reflects the display light L emitted by the display section 10 toward the concave mirror 30. The concave mirror 30 magnifies and reflects the display light L reflected by the plane mirror 20 toward the windshield 201 (see FIG. 1).
Note that the plane mirror 20 may be a concave mirror.

The housing 60 is made of non-transparent resin or metal and has a hollow, substantially rectangular parallelepiped shape. Each component of the head-up display device 100 is housed within the housing 60.
An opening 61 is formed in the housing 60 at a position facing the windshield 201. The housing 60 includes a window 50 in the shape of a curved plate that closes the opening 61 . The window portion 50 is made of a translucent resin such as acrylic through which the display light L passes.

The display 14 is a TFT (Thin Film Transistor) type liquid crystal display panel that is controlled by the control unit 70. The display device 14 receives light from the lighting device 18 and emits display light L.

The lighting device 18 is located on the back side of the display 14 and illuminates the display 14 with illumination light. The lighting device 18 includes a plurality of light sources 18a that emit light to the display 14 under the control of a control unit 70 (an example of a drive control unit). Each light source 18a consists of an LED.

Next, the electrical configuration of the display section 10 and the control section 70 will be explained.
As shown in FIG. 3, the display unit 10 includes a plurality of light sources 18a, a display 14, and a signal adjustment circuit 73. The control unit 70 includes a microcomputer 71, a light source driver IC 72, and an input voltage switching circuit 80 (an example of a transformer circuit).

The input voltage switching circuit 80 is provided between the power supply voltage Vc and the light source driver IC 72, and switches between an on state and an off state in response to a control signal Sc from the microcomputer 71. When the input voltage switching circuit 80 is in the on state, a transformed voltage obtained by transforming the input power supply voltage Vc to a level that can be input to the light source 18a is applied to the light source driver IC 72. The transformed voltage is a voltage used to operate the light source driver IC 72. When the input voltage switching circuit 80 is in the off state, application of the transformed voltage to the light source driver IC 72 is stopped.

The light source driver IC 72 is a switch circuit that receives the transformed voltage and generates a second PWM signal Spwm2 (drive signal) which is a boosted first PWM (Pulse Width Modulation) signal Spwm1 (lighting signal) from the microcomputer 71, which will be described later. . The second PWM signal Spwm2 is a signal synchronized with the first PWM signal Spwm1. The light source driver IC 72 supplies the light source current Iled to the plurality of light sources 18a via the second PWM signal Spwm2. The anode terminal of the light source 18a is connected to the light source driver IC 72. A cathode terminal of the light source 18a is connected to the microcomputer 71 via a signal adjustment circuit 73.

The microcomputer 71 includes a processing unit such as a CPU (Central Processing Unit) that executes an operating program, a ROM (Read Only Memory) that stores the operating program of this processing unit, and a work area of this processing unit. It includes a RAM (Random Access Memory).
The microcomputer 71 includes, as functional blocks, a light control section 71a, a brightness abnormality determination section 71b, and a display control section 71c that controls the display 14.

The light control unit 71a controls the lighting of the light source 18a via the light source driver IC72. The light control unit 71a receives a required brightness signal Sa (an example of a control signal) indicating a required brightness from the outside, and lights up the light source 18a via the light source driver IC 72 at the required brightness included in the required brightness signal Sa. For example, the required brightness signal Sa increases in proportion to an outside light intensity detection value indicating ambient brightness included in vehicle information from an ECU (Electronic Control Unit) mounted on the vehicle. Further, the required brightness signal Sa may be a signal that sets the brightness to zero (turns off) by an operation by the viewer 1 or the like.
When the power of the display unit 10 is turned on, the light control unit 71a outputs an enable signal Sen to the light source driver IC 72, thereby permitting the operation of the light source driver IC 72. The light control unit 71a disables the operation of the light source driver IC 72 by stopping the output of the enable signal Sen after a brightness abnormality determination, which will be described later.

The dimming section 71a adjusts the brightness of the light source 18a by adjusting the duty ratio of the first PWM signal Spwm1 and the duty ratio of the ADIM (analog dimming input) signal Sadim. As the on-duty ratio of the first PWM signal Spwm1 becomes higher, the time (on time) during which the light source current Iled is supplied to the light source 18a in one cycle becomes longer, and the brightness of the light source 18a becomes higher. The higher the on-duty ratio of the ADIM signal Sadim, the higher the peak current value of the light source current Iled.
The frequency of the first PWM signal Spwm1 is set, for example, from 1 kHz to several hundred kHz. The frequency of the ADIM signal Sadim is set to, for example, several tens of kHz, preferably 50 kHz.

When the required brightness is within the normal brightness range, the dimming section 71a enters the normal brightness mode, fixes the duty ratio of the ADIM signal Sadim to a specified value, and generates the first PWM signal Spwm1 with a duty ratio according to the required brightness. do. In the normal brightness mode, the higher the required brightness, the higher the on-duty ratio of the first PWM signal Spwm1 is set.

When the required brightness is within a low brightness range that is set lower than the normal brightness range, the dimming unit 71a enters the low brightness mode, and adjusts the required brightness while fixing the duty ratio of the first PWM signal Spwm1 to the lower limit value. The ADIM signal Sadim is generated with a duty ratio corresponding to . In the low brightness mode, the higher the required brightness, the higher the on-duty ratio of the ADIM signal Sadim is set. The lower limit value of the on-duty ratio of the first PWM signal Spwm1 is set to, for example, 0.2%.

The display control unit 71c controls the display 14 to change the content displayed on the display 14 according to the input signal.

<1-2. Behavior explanation>
In order to provide a head-up display device with improved display quality during re-display, the head-up display device 100 operates in the following manner.

The control unit 70, which is an example of a drive control unit, performs a delay operation of delaying the switching to lighting by a first period when switching the light source 18a from an extinguished state to a lit state in accordance with the required luminance signal.

Specifically, when the required brightness signal Sa indicating that the light source 18a is to be switched from the off state to the on state is input to the control unit 70, the control unit 70 delays the input time by a first period and then switches the light source 18a on. 18a is switched to the lighting state.

In the conventional head-up display device, when the required brightness signal Sa is input, the light source 18a is switched to the lighting state without a large delay. For example, in this conventional example, only a delay occurs due to the response characteristics of a general electric circuit, and therefore only a delay of 1 microsecond or less occurs at most. In such conventional head-up display devices, when the light source is turned on in an unstable state of the electric circuit (mainly the state of residual charge), such as immediately after the light source is turned off, the light source flickers (blinks). , brightness may fluctuate), and the display quality may deteriorate. The inventor discovered such a problem for the first time.

The delay operation in this embodiment is a delay operation that delays switching to the lighting state by a first period (for example, about 1 to 5 seconds) from the input of the request brightness signal Sa. The control unit 70 may perform the delay operation based on a program that delays the signal by a predetermined period based on the clock signal, or may perform the delay operation by dulling the signal with a capacitor or the like. Further, the delay operation may be performed by the microcomputer 71 included in the control section 70 or by the light source driver IC 72. More preferably, the delay operation is about 3 seconds.

The head-up display device 100 that performs the delayed operation in this manner can suppress the light source 18a from being turned on when the internal charge state is unstable, such as immediately after the light source 18a has been turned off, and can further reduce the time when the light source 18a is redisplayed. This is a head-up display device with improved display quality.

<1-3. Modified example>
A first embodiment has been shown above. However, the head-up display device of the present invention is not limited to this configuration.

For example, in the first embodiment, a mode is shown in which the control unit 70 performs a delay operation that delays switching to lighting for a first period, but the control unit 70 switches the light source from off to lighting at a low brightness. It is more preferable to perform the delay operation only when

The light source used in a head-up display device is also used for display in environments such as at night or in a tunnel, and therefore may be turned on at extremely low brightness. In the case of such extremely low brightness (for example, 5% or less of the maximum brightness of the light source, more preferably 1% or less), the current or voltage of the drive signal that drives the light source becomes small, and the control unit 70 or the input voltage Fluctuations in the operation of the switching circuit 80 tend to be noticeable. For example, when fluctuations in operation occur when lighting is started at low brightness, the second PWM signal Spwm2 becomes a relatively weak signal (low voltage or small on-duty ratio), and such a signal is not used by the light source driver IC 72 or input voltage switching. It may be relatively difficult for the circuit 80 to provide stable output immediately after lighting starts.

Therefore, according to this configuration, while achieving the object of the present application, by limiting the conditions for performing the delay operation, when performing a drive operation that is relatively less likely to cause display disturbances, it is possible to perform the driving operation quickly as before. It becomes a head-up display device that can display images.

For example, it is more preferable that the control unit 70 performs the delay operation only when the light source 18a is turned on again within a predetermined period from the time when the light source 18a is turned off.

Immediately after the light source 18a is turned off, the state within the circuit is relatively not in a steady state, and charges may remain in each circuit and each element. Therefore, when the light source 18a is turned on again immediately after being turned off, fluctuations in the operation of the control unit 70 and the input voltage switching circuit 80 are likely to occur.

Therefore, according to this configuration, while achieving the object of the present application, by limiting the conditions for performing the delay operation, when performing a drive operation that is relatively less likely to cause display disturbances, it is possible to perform the driving operation quickly as before. It becomes a head-up display device that can display images.

Note that the two modified examples shown here may be combined.

[Second embodiment]
In the second embodiment, a head-up display device 101 will be described. Regarding the head-up display device 101, portions that are different in configuration from the head-up display device 100 shown in the first embodiment will be described in detail.

<2-1. Behavior explanation>
In order to provide a head-up display device with improved display quality during re-display, the head-up display device 101 operates in the following manner based on the configuration shown in FIG. 3.

The control unit 70, which is an example of a drive control unit, when switching the light source 18a from the off state to the on state at the first brightness according to the required brightness signal, turns on the light source 18a at a second brightness brighter than the first brightness, and then switches the light source 18a to the first brightness. Performs a buffering operation that lights up depending on the brightness.

Specifically, when the requested brightness signal Sa indicating that the light source 18a is to be switched from the off state to the on state at the first brightness is input to the control unit 70, the control unit 70 causes the control unit 70 to switch the light source 18a to a state brighter than the requested first brightness. The light source 18a is turned on at the second brightness, and then turned on at the first brightness.

In the conventional head-up display device, when the required brightness signal Sa is input, the light source 18a is turned on according to the brightness (first brightness) indicated by the required brightness signal Sa. In this conventional example, the light source 18a lights up at a brightness that approximately matches the first brightness, although there may be slight variations in brightness depending on the characteristics of general electric circuits. However, in conventional head-up display devices, when the light source is switched from off to on at low brightness, the light source flickers (blinks, (brightness may fluctuate) and display quality may deteriorate. The inventor discovered such a problem for the first time.

The buffering operation in this embodiment is such that, after receiving the request brightness signal Sa requesting lighting at the first brightness, the control unit 70 lights the light source 18a at the second brightness and then lights it at the first brightness. perform an action. For example, when the light source driver IC 72 and the input voltage switching circuit 80 start lighting, if the brightness of the light source 18a is low, the rise of the output may be delayed. However, if the control unit 70 turns on the light source 18a at a second brightness that is brighter than the first brightness, and then turns it on at the first brightness, the delay in startup can be eliminated.

The head-up display device 101 that performs a buffering operation in this manner prevents the lighting of the light source 18a from flickering even if there is a delay in the rise of the output of the control unit 70 or the input voltage switching circuit 80 immediately after the lighting of the light source 18a starts. This results in a head-up display device that can suppress this and improve the display quality when re-displaying.

<2-2. Modified example>
A second embodiment was shown above. However, the head-up display device of the present invention is not limited to this configuration.

For example, in the second embodiment, it is more preferable that the control unit 70 performs the buffering operation only when the first brightness is lower than a predetermined brightness. A delay in the rise of the output of the control unit 70 or the input voltage switching circuit 80 tends to occur when lighting is started at low brightness. The predetermined brightness is, for example, about 5% of the maximum brightness of the light source 18a, more preferably about 1% of the maximum brightness.

For example, when the control unit 70 receives a request brightness signal Sa instructing lighting at a brightness of about 0.5% (first brightness), the control unit 70 causes the light source 18a to turn on at a brightness of about 1% (second brightness). After that, the light source 18a is turned on at a brightness of about 0.5%.

Therefore, according to this configuration, while achieving the object of the present application, by limiting the conditions for performing the buffering operation, when performing a driving operation that is relatively less likely to cause display disturbances, it is possible to perform the drive operation as quickly as before. This results in a head-up display device that can perform display at the required brightness.

For example, it is more preferable that the control unit 70 performs the delay operation only when the light source 18a is turned on again within a predetermined period from the time when the light source 18a is turned off.

According to this configuration, while achieving the object of the present application, by limiting the conditions for performing the delay operation, when performing a drive operation that is relatively less likely to cause display disturbances, the display can be performed quickly as before. It becomes a head-up display device that can be used as a head-up display device.

Note that the two modified examples shown here may be combined.

In addition, when switching from the second brightness to the first brightness, the control unit 70 gradually changes the brightness over a predetermined number of seconds (about 1 to 5 seconds, for example, about 3 seconds) to It is more desirable to switch to brightness.

[Third embodiment]
In the third embodiment, a head-up display device 102 will be described. Regarding the head-up display device 102, portions that are different in configuration from the head-up display device 100 shown in the first embodiment will be described in detail.

<3-1. Configuration explanation>
FIG. 4 shows a block diagram of the head-up display device 102. The head-up display device 102 includes a discharge circuit 74 that electrically connects the microcomputer 71 and the anode side wiring (power supply line) of the light source 18a.

The discharge circuit 74 discharges the charge remaining in the anode side wiring of the light source 18a when the light source 18a is switched from the on state to the off state. Specifically, the discharge circuit 74 is a circuit that switches the anode side wiring to either a high impedance state or a state connected to the ground potential. The discharge circuit 74 switches this switching state according to the potential of the output IO port of the microcomputer 71.

<3-2. Behavior explanation>
The discharge circuit 74 puts the anode side wiring in a high impedance state while the light source 18a is lit, so that the light source driver IC 72 can drive the light source 18a. Further, the discharge circuit 74 connects the anode side wiring to the ground potential while the light source 18a is turned off.

In conventional head-up display devices, when the light source is turned off, a charge remains in the power supply line (for example, the anode side wiring of the LED), so that when the display is re-displayed, the light source 18a is temporarily turned on by the electrification. However, there are cases where the light goes off soon, and then turns on again when normal power is supplied. The inventor discovered this problem for the first time.

Therefore, by providing the discharge circuit 74, it is possible to discharge the residual charge when the light source 18a is turned off, and prevent the slight lighting (blinking) when the display is re-displayed, and the head-up display improves the display quality when the display is re-displayed. It becomes a device.

Note that the discharge circuit 74 does not have to be configured to discharge charges based on the control by the microcomputer 71. For example, the discharge circuit 74 may discharge charges based on an enable signal of the light source driver IC 72, or may discharge charges based on a signal that controls lighting of the light source and start of display.

Further, the discharge circuit 74 may discharge the charge continuously while the light source 18a is turned off, or may discharge the charge only for a predetermined period (for example, a period of less than 1 second) after the light source 18a is turned off. It's okay.

[Fourth embodiment]
In the fourth embodiment, a head-up display device 103 will be described. Regarding the head-up display device 103, the parts that are different in configuration from the head-up display device 100 shown in the first embodiment will be described in detail.

<3-1. Behavior explanation>
If the brightness at which the on-duty ratio of the second PWM signal Spwm2 is smaller than a predetermined value is defined as the third brightness, the microcomputer 71 (drive control section) will control the light source 18a when switching the light source 18a from the off state to the on state at the third brightness. , a buffering operation is performed in which the light source 18a is turned on with a light source current Iled smaller than normal while the on-duty ratio of the light source 18a is larger than normal.

In a conventional head-up display device, a light source is turned on using a PWM signal. However, when the on-duty ratio of the PWM signal becomes smaller than a predetermined value, the output of a drive control section such as a light source driver IC, or a power section such as an input voltage switching circuit or a transformer circuit may rise slowly. The inventor discovered this problem for the first time.

Therefore, in the head-up display device 103, as described above, the control unit 70 increases the on-duty ratio when the on-duty ratio of the PWM signal is small. However, if this continues, the brightness of the light source 18a will increase more than necessary, so the light source current Iled is reduced.

This configuration also provides a head-up display device with improved display quality during redisplay.
Note that in the fourth embodiment as well, a configuration that combines the modifications shown in section 1-3 and section 2-2 may be adopted. In such a modification, the conditions for performing the buffering operation can be limited, and the control of the light source can be simplified.

[Modified example]
Note that the present invention is not limited to the above embodiments and drawings. It is possible to make changes (including deletion of constituent elements) as appropriate without changing the gist of the present invention. An example of the modification will be described below. The following modifications may be combined as appropriate.

In the embodiment described above, the display device 14 is a liquid crystal display panel, but is not limited thereto, and may be a reflective display device such as a DMD (Digital Micro Mirror Device) element.

In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. Further, the projected member is not limited to the windshield 201, but may be a dedicated combiner.

Further, a mode is shown in which the light source 18a is supplied with power from the input voltage switching circuit 80 via the light source driver IC 72. However, the light source 18a may be directly connected to and powered by the input voltage switching circuit 80. In that case, the power supplied by the input voltage switching circuit 80 is supplied from the anode side wiring of the light source 18a, and the light source driver IC 72 drives the light source 18a by controlling whether or not current flows through the cathode side wiring of the light source 18a. May be operated.

1 Viewer 10 Display section 14 Display device 18 Lighting device 18a Light source 20 Plane mirror 30 Concave mirror 50 Window section 60 Housing 61 Opening section 70 Control section 71 Microcomputer 71a Light control section 71c Display control section 72 Light source driver IC
73 Signal adjustment circuit 80 Input voltage switching circuit 100 Head-up display device 200 Vehicle 201 Windshield L Display light V Virtual image Sa Requested brightness signal Sc Control signal Vc Power supply voltage Sen Enable signal Sfp PWM feedback signal Vct Cathode voltage Iled Light source current Spwm1 1st PWM Signal Spwm2 2nd PWM signal Sadim ADIM signal

Claims (8)

A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input signal;
Equipped with
The drive control unit performs a delay operation to delay lighting by a first period when switching the light source from off to on. The head-up display device. The head-up display device according to claim 1, wherein the drive control unit performs the delay operation only when switching the light source from off to on at low brightness. The head-up display device according to claim 1, wherein the drive control unit performs the delay operation only when the light source is turned on again within a predetermined period from the time when the light source is turned off. A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input control signal;
Equipped with
When switching the light source from off to on at a first brightness, the drive control unit performs a buffering operation of turning on at a second brightness brighter than the first brightness and then turning on at the first brightness. Head-up display device . The head-up display device according to claim 4, wherein the drive control section performs the buffering operation only when the first brightness is lower than a predetermined brightness. The head-up display device according to claim 4, wherein the drive control section performs the buffering operation only when the light source is turned on again within a predetermined period from the time when the light source is turned off. A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that drives the light source according to an input control signal;
a transformation circuit that transforms input power and supplies the transformed power to the drive control unit or the light source;
Equipped with
The drive control unit includes a discharge circuit that discharges charge from a power supply line that supplies power to the light source when the light source is switched from a lighting state to a non-lighting state. A head-up display device that emits display light to a projected member,
a light source that emits illumination light;
a display that emits the display light when illuminated by the illumination light;
a drive control unit that performs a drive operation of turning on and off the light source according to an input control signal;
Equipped with
The drive control section includes:
driving and operating the light source by changing a pulse width modulation signal and a current value;
If the brightness at which the on-duty ratio of the pulse width modulation signal is smaller than a predetermined value is defined as the third brightness, then when switching the light source from off to on at the third brightness, the on-duty ratio of the pulse width modulation signal is set to normal. A head-up display device that performs a buffering operation that reduces the current value compared to normal while increasing the current value.

Images