CN110827786A - Method for adjusting brightness uniformity of folding screen - Google Patents

Method for adjusting brightness uniformity of folding screen Download PDF

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Publication number
CN110827786A
CN110827786A CN201911249626.5A CN201911249626A CN110827786A CN 110827786 A CN110827786 A CN 110827786A CN 201911249626 A CN201911249626 A CN 201911249626A CN 110827786 A CN110827786 A CN 110827786A
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screen
time
light
folding
brightness
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王红梅
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a method for adjusting brightness uniformity of a folding screen, which is used for controlling the light-emitting time of each folding section of the folding screen respectively, wherein the light-emitting time T1 of a frequently-used folding section is greater than the light-emitting time T2 of a less-used folding section. According to the invention, the light-emitting time T1 of the frequently-used folding segment is controlled to be longer than the light-emitting time T2 of the less-used folding segment, and the light-emitting time is in direct proportion to the light-emitting brightness, so that the display brightness of the frequently-used folding segment is equal to the brightness of the less-used folding segment, and the display consistency of the folding screen is ensured.

Description

Method for adjusting brightness uniformity of folding screen
Technical Field
The invention relates to a method for adjusting brightness uniformity of a folding screen.
Background
The foldable screen is a foldable screen, can be folded into one, two or more folds along a folding line, and is small in size and convenient to carry after being folded.
Referring to fig. 1, the folding screen includes a fold 1, and the folding screen is folded along the fold 1 to form two screens, namely a B screen 2 and a C screen 3; during daily use, fold B screen 2 or C screen 3, only use B screen 2 or C screen 3, the section is rolled over for the commonly used often to the screen of daily use, and daily folding unused screen is the less section of rolling over of using. Of course, the number of folds in the folded screen may be 2 two, 3 or more.
The foldable display screen is composed of a plurality of basic pixel units, the circuit structure of each pixel unit is shown in fig. 2 and comprises a triode SM1, an energy storage capacitor C, a triode SM2 and a driving tube DM3, a frame signal Vdata is loaded on the drain electrode of the triode SM1, a control signal G is loaded on the grid electrode, and the source electrode of the triode SM1 is respectively connected with the first polar plate of the energy storage capacitor C and the grid electrode of the driving tube DM 3; a second plate of the energy storage capacitor C loads a voltage Vdd, the drain electrode of the driving tube DM3 is connected with the source electrode of the triode SM2, the source electrode of the driving tube DM3 serves as an output end and is used for being connected with the anode of the light emitting diode D, and the cathode of the light emitting diode D is connected with Vss; the drain of the transistor SM2 is connected to the voltage Vdd and the gate is loaded with the control signal EM.
With reference to the timing diagram shown in fig. 3, the operation principle of the basic pixel unit in fig. 2 is analyzed, and the specific operation analysis includes:
em is high, turning off the SM2 transistor, G is low, turning on the SM1 transistor; vdata is written into the point A, and the energy storage capacitor C keeps storing.
G is high, the SM1 transistor is turned off, Em is low, the SM2 transistor is turned on, and Vdd is written to the point S; DM3 emits light under the joint control of the voltage at the point A, the voltage at the point S and the voltage at the point D; the DM3 transistor is enabled to work in a saturation region by adjusting Vdd, Vss and Vdata voltages; the current of the DM3 transistor is I =1/2K (Vdata-Vdd) 2, and the larger this current, the larger the brightness of the LED D.
From the above analysis, the DC dimming is voltage dimming, and the voltage of Vdd can be reduced, or the value of Vdata can be increased, so that the difference between the two becomes smaller, thereby the current is reduced, and the brightness of the light emitting diode is reduced. Normally, for convenient operation, DC dimming is used to reduce Vdd, and Em control duration is dimmed to increase the time for Em to turn off SM2 transistor, so that Vdd voltage cannot be written to S point, and DM3 transistor cannot work, and thus there is no current, so that the led has no brightness. The overall brightness seen by the human eye within such a frame becomes lower. When Em switches off the SM2 transistor for too long, flicker feeling is brought to eyes, in order to reduce the feeling, the Em is segmented into high time, the SM2 transistor is switched off in a segmented mode, and the whole switching-off time Toff = t1+ …. + tn; as shown in fig. 4.
The mobile phone formed by the foldable screen is a foldable mobile phone, the whole screen of the mobile phone is a touch display screen, and the foldable mobile phone is unfolded into a tablet personal computer and folded into a mobile phone. Typical folding screen handsets typically have a crease 1, crease 2, crease 3 or multiple creases. However, most of the users use the mobile phone as a tablet, the time for using the tablet is short, when the mobile phone is used as a mobile phone, the folding screen is usually folded, a part of the screen is used to form a screen with long service time, and the other part of the screen which is not used is a screen with short service time.
When a longer screen is used, the aging of the TFTs and the OLEDs is more severe, resulting in a decrease in screen brightness compared to a screen that has been used for a shorter period of time; when the display panel is unfolded for use as a flat panel, the brightness of the screen is not uniform over time.
Based on the principle, the whole folding screen is controlled to be switched on and off at the same time, local brightness adjustment cannot be carried out, the display brightness difference exists between the sections which are frequently used and the sections which are less used, and the brightness consistency of the whole folding screen cannot be guaranteed when the folding screen is used at the same time.
Disclosure of Invention
In order to solve the problems in the prior art, an object of the present invention is to provide a method for adjusting brightness uniformity of a foldable screen, which can ensure uniform display of the foldable screen.
In order to achieve the purpose of the present invention, the method for adjusting brightness uniformity of a folding screen provided herein separately controls the length of the light-emitting time of each segment of the folding screen, and the light-emitting time T1 of the frequently used segment is greater than the light-emitting time T2 of the less frequently used segment.
Furthermore, the light-emitting time T1 and the light-emitting time T2 are increased or decreased in a key adjustment mode. The light-emitting time T1 and the light-emitting time T2 are increased or reduced by using a key adjusting mode, so that the problems that the brightness is adjusted by sliding the finger, the change amplitude of the brightness is too large, and the requirement of fine adjustment cannot be met are solved, and the fine adjustment is realized.
Specifically, the light-emitting time T1 and the light-emitting time T2 satisfy the following relationships (1) and (2), respectively:
（1）
in the formula (1), the reaction mixture is,
Figure DEST_PATH_IMAGE003
is a time of one frame, and the time of one frame,
Figure DEST_PATH_IMAGE005
off time for the regular use break;
Figure 772892DEST_PATH_IMAGE006
（2）
in the formula (2), the reaction mixture is,
Figure 572221DEST_PATH_IMAGE003
is a time of one frame, and the time of one frame,
Figure 469507DEST_PATH_IMAGE008
the closing time of the flap is used less.
The invention has the beneficial effects that: by controlling the light-emitting time T1 of the frequently-used section to be greater than the light-emitting time T2 of the less-used section, the display brightness of the frequently-used section is equal to the brightness of the less-used section because the light-emitting time is in direct proportion to the average brightness of light emission, and the display consistency of the folding screen is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of a foldable screen according to the present invention;
FIG. 2 is a diagram of a basic pixel circuit structure according to the present invention;
FIG. 3 is a control timing diagram of a basic pixel circuit;
FIG. 4 is a timing diagram of the control signal Em of FIG. 3 segmented as high to turn off the SM2 transistor;
FIG. 5 is a schematic diagram of signal loading for the conditioning method provided by the present invention;
FIG. 6 is a schematic diagram of a folded screen with brightness bars;
in the drawings: 1-fold, 2-B screen, 3-C screen, 4-A screen, and 5-brightness bar.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
Referring to fig. 1, the folding screen includes a fold 1, and the folding screen is folded along the fold 1 to form two screens, namely a B screen 2 and a C screen 3; during daily use, fold B screen 2 or C screen 3, only use B screen 2 or C screen 3, the section is rolled over for the commonly used often to the screen of daily use, and daily folding unused screen is the less section of rolling over of using. Of course, the number of folds in the folded screen may be 2 two, 3 or more.
In order to ensure the brightness consistency of the frequently used folding sections and the less frequently used folding sections of the folding screen, the invention provides a brightness uniformity adjusting method of the folding screen, which respectively controls the length of the light-emitting time of each folding section of the folding screen, wherein the light-emitting time T1 of the frequently used folding sections is longer than the light-emitting time T2 of the less frequently used folding sections; the B screen 2 is a commonly used folding section, and the C screen 3 is a less used folding section.
Referring to fig. 5, the invention loads control signals EmSTVb and EmSTVc to the B screen 2 and the C screen 3 respectively for controlling the light emitting time of the B screen 2 and the C screen 3, the EmSTVb controls the light emitting time T1 of the display screen B, and the EmSTVc controls the light emitting time T2 of the C screen 3, so that the separate control of the light emitting duration of the B screen 2 and the C screen 3 is realized, and the light emitting time T1 of the B screen 2 is greater than the light emitting time T2 of the C screen 3.
Originally, the B screen 2 is aged due to long-term use so that the brightness is lower than that of the C screen 3, the T1 is made to be larger than T2 by adopting the adjusting method provided by the invention, thus the brightness Lb of the B screen 2 with the comprehensive effect of human eyes is equal to the brightness Lc of the C screen 3, and when Lb = Lc, the B screen 2 and the C screen 3 are combined into the display screen A. After the A screen 4 is synthesized, the brightness adjusting mode is not required, and the A screen 4 can be used for unified adjustment, or the B screen 2 and the C screen 3 can be used for separated adjustment.
The adjusting method provided by the invention can be realized in any mode, and is carried out in a mode of firstly scattering and then adjusting, and specifically comprises the following two adjusting modes:
the first method comprises the following steps:
the turn-off time of the light emitting diode in the B screen 2 is controlled by EmSTVb; the light emitting time T1 of the led satisfies the following relationship (1):
Figure DEST_PATH_IMAGE009
（1）
in the formula (1), the reaction mixture is,is a time of one frame, and the time of one frame,in order to use the closing time of the fold,
Figure 603051DEST_PATH_IMAGE010
。
by adopting the adjusting method provided by the invention, the turn-off time of the light-emitting diode in the C screen 3 is controlled by EmSTVc; the light emitting time T2 of the light emitting diode satisfies the following formula (2)
Figure 308839DEST_PATH_IMAGE006
（2）
In the formula (2), the reaction mixture is,
Figure 457055DEST_PATH_IMAGE003
is a time of one frame, and the time of one frame,
Figure 185976DEST_PATH_IMAGE008
in order to use less of the closing time of the flap,。
from the above
Figure DEST_PATH_IMAGE012
And
Figure 198986DEST_PATH_IMAGE013
therefore, the light emitting time of the B screen 2 and the light emitting time of the C screen 3 can be controlled by adjusting the n numbers of the B screen 2 and the C screen 3 respectively.
The adjustment of the light emitting time of the B screen 2 and the C screen 3 is realized through the brightness bars, the adjustment can be performed through finger sliding, but the adjustment range is too large due to the finger sliding adjustment, so that the fine adjustment requirement cannot be met; therefore, the invention adopts the addition and subtraction keys to adjust, and can finely divide according to the length of the light-emitting time. For example, if the B screen 2 and the C screen 3 set the off-time parameter n to 1024, 1024 brightness adjustments can be performed. The adjustment mode of the plus-minus key is much higher than the finger sliding precision, the value of n is reduced by pressing the plus key, and the value of n is increased by pressing the minus key, so that the brightness of the B screen 2 and the C screen 4 is finely adjusted, and the comprehensive brightness effect is equal finally.
And the second method comprises the following steps:
Figure DEST_PATH_IMAGE014
，
Figure 163443DEST_PATH_IMAGE015
wherein, in the step (A),
Figure DEST_PATH_IMAGE016
and
Figure 176399DEST_PATH_IMAGE017
is a variable, and is a function of,
Figure DEST_PATH_IMAGE018
and
Figure 934270DEST_PATH_IMAGE019
as a matter of time, the time is,
Figure 598339DEST_PATH_IMAGE018
and
Figure 603204DEST_PATH_IMAGE019
the values can be preset or adjusted in the using process; when preset, the value is small. By changing variables
Figure 854188DEST_PATH_IMAGE016
And variables
Figure 337122DEST_PATH_IMAGE017
To adjust the size of T1 and the size of T2; so that the B-screen 2 and the C-screen 3 have the same brightness. Such as
Figure DEST_PATH_IMAGE020
\
Figure 183593DEST_PATH_IMAGE021
To decrease the T1\ T2 time;
Figure DEST_PATH_IMAGE022
\increasing the time T1\ T2; at the beginning of the process, the process is carried out,
Figure DEST_PATH_IMAGE024
，
Figure 676069DEST_PATH_IMAGE025
. After the brightness is the same, the T1 is divided into n small segments T1/n, and the T2 is divided into n small segments T2/n, so that the on-state time/off-state time is dispersed and then divided into frames, thereby avoiding the phenomenon that the on-state time/the off-state time is scattered and divided into framesAvoid flicker.
The two adjusting modes can adjust the brightness in a manual screen sliding mode, but the brightness change amplitude of the manual screen sliding mode is too large to meet fine adjustment, so that the adjustment is realized in a key mode, and +/-1, +/-2, +/-3 or +/-is realized through keys
Figure DEST_PATH_IMAGE026
Fine adjustment is carried out; the keys include a + key and a-key for plus and minus adjustment, respectively.
The second method of firstly breaking up and then adjusting is used to explain the key adjustment principle: changing variables by pressing keys
Figure 775743DEST_PATH_IMAGE016
And variables
Figure 899557DEST_PATH_IMAGE017
To adjust the size of T1 and the size of T2; so that the B-screen 2 and the C-screen 3 have the same brightness. Such as a one-time-key press,
Figure 495493DEST_PATH_IMAGE020
\
Figure 908019DEST_PATH_IMAGE021
to reduce the time of T1\ T2, press the positive key once,
Figure 811384DEST_PATH_IMAGE022
to increase the time of T1\ T2. After the brightness is the same, the T1 is divided into n small sections of T1/n, and the T2 is divided into n small sections of T2/n, so that the on-state time/off-state time is scattered and then divided into frames, and flicker is avoided.
When the brightness is adjusted by using the key mode, the keys are respectively arranged on the B screen 2 and the C screen 3 as brightness bars 5 and are respectively used for regulating and controlling the B screen 2 and the C screen 3, as shown in fig. 6.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (4)

1. A method for adjusting brightness uniformity of a folding screen is characterized by comprising the following steps: the method respectively controls the length of the light-emitting time of each folding section of the folding screen, and the light-emitting time T1 of the frequently used folding section is longer than the light-emitting time T2 of the less frequently used folding section.
2. The method for adjusting the brightness uniformity of a folded screen according to claim 1, wherein: the light-emitting time T1 is increased or decreased by means of key adjustment.
3. The method for adjusting the brightness uniformity of a folded screen according to claim 1, wherein: the light-emitting time T2 is increased or decreased by means of key adjustment.
4. The folding screen brightness uniformity adjustment method according to claim 1, 2 or 3, characterized in that: the light emission time T1 and the light emission time T2 satisfy the following relationships (1) and (2), respectively:
（1）
in the formula (1), the reaction mixture is,
Figure DEST_PATH_IMAGE004
is a time of one frame, and the time of one frame,
Figure DEST_PATH_IMAGE006
off time for the regular use break;
Figure DEST_PATH_IMAGE008
（2）
in the formula (2), the reaction mixture is,
Figure DEST_PATH_IMAGE004A
is a time of one frame, and the time of one frame,
Figure DEST_PATH_IMAGE010
the closing time of the flap is used less.
CN201911249626.5A 2019-12-09 2019-12-09 Method for adjusting brightness uniformity of folding screen Pending CN110827786A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101937651A (en) * 2010-09-19 2011-01-05 友达光电股份有限公司 Light emitting diode driving method
US20140125714A1 (en) * 2012-11-06 2014-05-08 Si-Baek PYO Display device and method of driving the same
US20150097764A1 (en) * 2013-10-04 2015-04-09 Samsung Display Co., Ltd. Driving method for dimming an organic light-emitting diode (oled) display
CN105788531A (en) * 2016-05-20 2016-07-20 深圳市华星光电技术有限公司 Driving circuit of OLED (Organic Light Emitting Diode) display panel
CN109584806A (en) * 2019-02-01 2019-04-05 武汉天马微电子有限公司 A kind of display panel and its driving method and display device
CN109981843A (en) * 2019-03-15 2019-07-05 Oppo广东移动通信有限公司 Screen processing method, apparatus, electronic equipment and the storage medium of electronic equipment
CN110459168A (en) * 2019-08-21 2019-11-15 Oppo广东移动通信有限公司 Driving method, driving circuit, display screen component and electronic equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101937651A (en) * 2010-09-19 2011-01-05 友达光电股份有限公司 Light emitting diode driving method
US20140125714A1 (en) * 2012-11-06 2014-05-08 Si-Baek PYO Display device and method of driving the same
US20150097764A1 (en) * 2013-10-04 2015-04-09 Samsung Display Co., Ltd. Driving method for dimming an organic light-emitting diode (oled) display
CN105788531A (en) * 2016-05-20 2016-07-20 深圳市华星光电技术有限公司 Driving circuit of OLED (Organic Light Emitting Diode) display panel
CN109584806A (en) * 2019-02-01 2019-04-05 武汉天马微电子有限公司 A kind of display panel and its driving method and display device
CN109981843A (en) * 2019-03-15 2019-07-05 Oppo广东移动通信有限公司 Screen processing method, apparatus, electronic equipment and the storage medium of electronic equipment
CN110459168A (en) * 2019-08-21 2019-11-15 Oppo广东移动通信有限公司 Driving method, driving circuit, display screen component and electronic equipment

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Application publication date: 20200221