WO2023185079A1 - 像素驱动电路及电润湿显示器 - Google Patents

像素驱动电路及电润湿显示器 Download PDF

Info

Publication number
WO2023185079A1
WO2023185079A1 PCT/CN2022/137320 CN2022137320W WO2023185079A1 WO 2023185079 A1 WO2023185079 A1 WO 2023185079A1 CN 2022137320 W CN2022137320 W CN 2022137320W WO 2023185079 A1 WO2023185079 A1 WO 2023185079A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
electrode
electrowetting
time period
switch
Prior art date
Application number
PCT/CN2022/137320
Other languages
English (en)
French (fr)
Inventor
樊涛
袁海江
Original Assignee
绵阳惠科光电科技有限公司
惠科股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 绵阳惠科光电科技有限公司, 惠科股份有限公司 filed Critical 绵阳惠科光电科技有限公司
Priority to KR1020247019945A priority Critical patent/KR20240104170A/ko
Publication of WO2023185079A1 publication Critical patent/WO2023185079A1/zh
Priority to US18/513,646 priority patent/US12125450B2/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/348—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on the deformation of a fluid drop, e.g. electrowetting
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the present application relates to the field of display technology, and in particular to a pixel driving circuit and an electrowetting display.
  • the existing mainstream displays mainly include LCD (Liquid Crystal Display) displays and OLED (Organic Light-Emitting Diode, organic light-emitting diode) displays.
  • LCD displays require a backlight module as a light source, and OLED displays use organic light-emitting materials. Actively emitting light in the excited state, the display effect is easily affected by ambient light. When the ambient light is relatively strong, both LCD displays and OLED displays need to increase the display brightness to improve the display effect.
  • Electrowetting displays Because its display principle is reflective luminescence, electrowetting displays can still ensure good visible display in strong lighting environments. Electrowetting displays have the advantages of being portable, thin, flexible, high contrast, low power consumption and fast response, and occupy a place in the display field. In recent years, research on electrowetting displays has made good progress, but currently electrowetting displays have problems with charge trapping and ink splitting.
  • Embodiments of the present application provide a pixel driving circuit and an electrowetting display, which can solve the problems of charge trapping and ink splitting in electrowetting displays.
  • embodiments of the present application provide a pixel driving circuit for use in electrowetting displays, including a timing control unit, a first switch unit, a second switch unit and a power supply unit.
  • the timing control unit is respectively connected to the The control end of the first switch unit is electrically connected to the control end of the second switch unit.
  • the first switch unit is connected in series between the first electrode of the electrowetting pixel device and the ground.
  • the second switch unit is connected in series. Connected between the second electrode of the electrowetting pixel device and ground, the power supply unit is electrically connected to the first electrode of the electrowetting pixel device and the second electrode of the electrowetting pixel device respectively;
  • the power supply unit is used to provide a constant driving voltage
  • the timing control unit is used to periodically control the first switching unit and the second switching unit.
  • One control period includes a first time period and a second time.
  • the timing control unit controls the first switch unit to be turned on and the second switch unit to be turned off, so that the first electrode of the electrowetting pixel device is connected to the ground.
  • the timing control unit controls the first switch unit to turn off, and controls the second switch unit to turn on, so that the second electrode of the electrowetting pixel device is connected to ground conduction.
  • embodiments of the present application provide an electrowetting display, including a first substrate, a second substrate, a display panel, and the pixel driving circuit described in any one of the first aspects;
  • the display panel is disposed between the first substrate and the second substrate, the display panel includes an electrowetting pixel device arranged in an array, and the pixel driving circuit is electrically connected to the electrowetting pixel device. .
  • the timing control unit is used to periodically control the first switching unit and the second switching unit, so that the first switching unit and the second switching unit are periodically turned on and off.
  • a control period includes a first time period and a second time period.
  • the timing control unit controls the first switch unit to turn on, controls the second switch unit to turn off, and electrowets the first electrode of the pixel device.
  • the second electrode of the electrowetting pixel device is connected to the ground, and the second electrode of the electrowetting pixel device is connected to the power supply unit.
  • the driving voltage output by the power supply unit drives the electrowetting pixel device to work.
  • the timing control unit controls the first switch unit to turn off and the second switch unit to turn on.
  • the first electrode of the electrowetting pixel device is connected to the power supply unit, and the second electrode of the electrowetting pixel device is connected to the power supply unit.
  • the ground is turned on, and the driving voltage output by the power supply unit drives the electrowetting pixel device to work.
  • the voltage difference between the first electrode and the second electrode of the electrowetting pixel device will flip, which can prevent charge trapping and discharge due to charge accumulation on the first electrode and the second electrode of the electrowetting pixel device. Ink splitting problem.
  • Figure 1 is a schematic structural diagram of an electrowetting pixel device provided by an embodiment of the present application.
  • Figure 2 is a timing diagram of a pixel driving circuit driving an electrowetting pixel device provided by an embodiment of the present application
  • Figure 3 is a schematic connection diagram of an electrowetting pixel device provided by an embodiment of the present application.
  • Figure 4 is a schematic structural diagram of an electrowetting pixel device provided by another embodiment of the present application.
  • Figure 5 is a schematic connection diagram of an electrowetting pixel device provided by another embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of an electrowetting display provided by an embodiment of the present application.
  • the term “if” may be interpreted as “when” or “once” or “in response to determining” or “in response to detecting” depending on the context.
  • the phrase “if determined” or “if [the described condition or event] is detected” may be interpreted, depending on the context, to mean “once determined” or “in response to a determination” or “once the [described condition or event] is detected ]” or “in response to detection of [the described condition or event]”.
  • the working principle of the electrowetting pixel device is as follows: a DC driving voltage is applied between the first electrode and the second electrode of the electrowetting pixel device, so that the ink in the electrowetting pixel device shrinks and expands, thereby realizing the optical switch. effect.
  • a DC driving voltage is applied between the first electrode and the second electrode of the electrowetting pixel device, so that the ink in the electrowetting pixel device shrinks and expands, thereby realizing the optical switch. effect.
  • no voltage is applied to the first and second electrodes of the electrowetting pixel device, the ink spreads evenly on the surface of the insulating medium, and the electrowetting pixel device presents a completely dark state of the ink color, that is, the electrowetting pixel device is in " Disabled.
  • the ink When a voltage is applied to the first and second electrodes of the electrowetting pixel device, the ink begins to shrink, shrinking to one side into an oil drop shape under the action of the driving voltage and surface tension, and the electrowetting pixel device presents a reflective substrate
  • the state of the color, that is, the electrowetting pixel device is in the "on" state.
  • the driving method for controlling the shrinkage of ink in electrowetting pixel devices is mainly to adjust the DC voltage loaded on the first electrode and the second electrode.
  • applying DC voltage to the first and second electrodes of the electrowetting pixel device for a long time can easily lead to charge trapping and ink splitting in the electrowetting pixel device, resulting in gray-scale voltage deviation and slow or irrecoverable ink recovery. question.
  • the pixel driving circuit includes a timing control unit 100, a first switching unit 200, a second switching unit 300 and a power supply unit 400.
  • the timing control unit 100 is electrically connected to the control end of the first switch unit 200 and the control end of the second switch unit 300 respectively.
  • the first switch unit 200 is connected in series between the first electrode of the electrowetting pixel device 500 and the ground.
  • the second switch unit 300 is connected in series between the second electrode of the electrowetting pixel device 500 and the ground, and the power supply unit 400 is electrically connected to the first electrode of the electrowetting pixel device 500 and the second electrode of the electrowetting pixel device 500 respectively.
  • the timing control unit 100 is used to periodically control the first switching unit 200 and the second switching unit 300, so that the first switching unit 200 and the second switching unit 300 Periodic on and off.
  • a control period includes a first time period and a second time period.
  • the timing control unit 100 controls the first switch unit 200 to turn on, controls the second switch unit 300 to turn off, and electrowetting the pixel device 500
  • the first electrode of the electrowetting pixel device 500 is connected to the ground
  • the second electrode of the electrowetting pixel device 500 is connected to the power supply unit 400
  • the driving voltage output by the power supply unit 400 drives the electrowetting pixel device 500 to work.
  • the timing control unit 100 controls the first switch unit 200 to turn off, controls the second switch unit 300 to turn on, the first electrode of the electrowetting pixel device 500 is connected to the power supply unit 400, and the electrowetting pixel device
  • the second electrode of 500 is connected to the ground, and the driving voltage output by the power supply unit 400 drives the electrowetting pixel device 500 to work.
  • the voltage difference between the first electrode and the second electrode of the electrowetting pixel device 500 will flip, which can prevent the first electrode and the second electrode of the electrowetting pixel device 500 from causing charge accumulation due to charge accumulation. Problems with charge trapping and ink splitting occur.
  • a control period also includes a third time period and a fourth time period.
  • the timing control unit 100 controls the first switch unit 200 to turn on and controls the second switch unit 300 to turn on.
  • the first electrode and the second electrode of the electrowetting pixel device 500 are connected to the ground.
  • the electrowetting pixel device 500 does not work.
  • the timing control unit 100 controls the first switch unit 200 to turn off, and controls the second switch unit 300 to turn off, so that both the first electrode and the second electrode of the electrowetting pixel device 500 are connected to the power supply unit 400. Pass, the electrowetting pixel device 500 does not work at this time.
  • the third time period is located between the first time period and the second time period, or the fourth time period is located between the first time period and the second time period.
  • the electrowetting pixel device 500 is in the working state during both the first time period and the second time period, and when the electrowetting pixel device 500 enters the second time period from the first time period, the electrowetting pixel device The voltages of the first electrode and the second electrode of 500 are reversed.
  • the electrowetting pixel device 500 does not operate during the third time period and the fourth time period, the third time period is between the first time period and the second time period, or the fourth time period is between the first time period and the second time period.
  • the electrowetting pixel device 500 can be converted from the working state to the inactive state, and then from the inactive state to the working state, thereby preventing the first electrode and the second electrode of the electrowetting pixel device 500 from being damaged for a long time.
  • Charge accumulation caused by loading DC voltage causes charge trapping problem.
  • the ink in the electrowetting pixel device 500 switches from a contracted state to an expanded state, and then from an expanded state to a contracted state, so that the ink can shrink and expand quickly and prevent ink splitting.
  • a driving cycle of the timing control unit 100 includes T1, T2, T3 and T4.
  • the timing control unit 100 outputs the first pulse signal PWM1 to control the first switching unit 200.
  • the timing control unit 100 outputs the first pulse signal PWM1.
  • the second pulse signal PWM2 controls the second switch unit 300 .
  • the first pulse signal PWM1 is high level
  • the second pulse signal PWM2 is low level
  • the first switch unit 200 is turned on
  • the second switch unit 300 is turned off
  • the first pulse signal of the pixel device 500 is electrowetting.
  • the voltage of the electrode is 0, the voltage of the second electrode of the electrowetting pixel device 500 is V, the voltage difference between the first electrode and the second electrode of the electrowetting pixel device 500 is -V, and the voltage of the second electrode of the electrowetting pixel device 500 is -V.
  • the first pulse signal PWM1 is high level
  • the second pulse signal PWM2 is high level
  • the first switch unit 200 is turned on
  • the second switch unit 300 is turned on
  • the first pulse of the pixel device 500 is electrowetting.
  • the voltage of the electrode is 0, the voltage of the second electrode of the electrowetting pixel device 500 is 0, the voltage difference between the first electrode and the second electrode of the electrowetting pixel device 500 is 0, and the ink in the electrowetting pixel device 500 Expand and return to the original state.
  • the first pulse signal PWM1 is low level
  • the second pulse signal PWM2 is high level
  • the first switch unit 200 is turned off
  • the second switch unit 300 is turned on
  • the first pulse signal of the pixel device 500 is electrowetting.
  • the voltage of the electrode is V
  • the voltage of the second electrode of the electrowetting pixel device 500 is 0
  • the voltage difference between the first electrode and the second electrode of the electrowetting pixel device 500 is V
  • the ink in the electrowetting pixel device 500 shrink.
  • the first pulse signal PWM1 is low level
  • the second pulse signal PWM2 is low level
  • the first switch unit 200 is turned off
  • the second switch unit 300 is turned off
  • the first pulse signal of the pixel device 500 is electrowetting.
  • the voltage of the electrode is V
  • the voltage of the second electrode of the electrowetting pixel device 500 is V
  • the voltage difference between the first electrode and the second electrode of the electrowetting pixel device 500 is 0, and the ink in the electrowetting pixel device 500 Expand and return to the original state.
  • the traditional electrowetting pixel device 500 adjusts the grayscale brightness by changing the output voltage of the power supply unit 400 .
  • the pixel driving circuit of the present application can realize the adjustment of the gray scale brightness of the electrowetting pixel device 500 by controlling the duty cycle of the first pulse signal PWM1 and the duty cycle of the second pulse signal PWM2, and only needs the power supply unit 400 to provide a constant
  • the DC driving voltage will reduce the requirements of the power supply unit 400, thereby reducing the design and production cost of the pixel driving circuit.
  • the first switch unit 200 includes a first switch Q1 .
  • the control terminal of the first switch Q1 is electrically connected to the timing control unit 100 .
  • the first switch Q1 is connected in series to the first terminal of the electrowetting pixel device 500 . between one electrode and ground.
  • the first control signal output by the timing control unit 100 controls the first switch Q1 to be turned on or off.
  • the first switch Q1 when the first control signal output by the timing control unit 100 is high level, the first switch Q1 is turned on, and the first electrode of the electrowetting pixel device 500 is connected to the ground. At this time, the electrowetting pixel device The first electrode voltage of 500 is 0.
  • the first control signal output by the timing control unit 100 is low level, the first switch Q1 is turned off, and the first electrode of the electrowetting pixel device 500 is not conductive to the ground. At this time, the first electrode of the electrowetting pixel device 500 is not conductive.
  • One electrode voltage is the driving voltage provided by the power supply unit 400 .
  • the first switch Q1 is an NMOS transistor.
  • the second switch unit 300 includes a second switch Q2.
  • the control end of the second switch Q2 is electrically connected to the timing control unit 100.
  • the second switch Q2 is connected in series to the second switch Q2 of the electrowetting pixel device 500. between the electrode and ground.
  • the second control signal output by the timing control unit 100 controls the second switch Q2 to be turned on or off.
  • the second switch Q2 when the second control signal output by the timing control unit 100 is high level, the second switch Q2 is turned on, and the second electrode of the electrowetting pixel device 500 is connected to the ground. At this time, the electrowetting pixel device The second electrode voltage of 500 is 0.
  • the second control signal output by the timing control unit 100 is low level, the second switch Q2 is turned off, and the second electrode of the electrowetting pixel device 500 is not conductive to the ground. At this time, the second electrode of the electrowetting pixel device 500 is not conductive.
  • the two-electrode voltage is the driving voltage provided by the power supply unit 400 .
  • the second switch transistor Q2 is an NMOS transistor.
  • FIG. 4 shows a schematic structural diagram of an electrowetting pixel device 500 provided by another embodiment of the present application.
  • the pixel driving circuit also includes a first current limiting unit 600 and a second current limiting unit 700 .
  • the first current limiting unit 600 is connected in series between the first electrode of the electrowetting pixel device 500 and the power supply unit 400
  • the second current limiting unit 700 is connected in series between the second electrode of the electrowetting pixel device 500 and the power supply unit 400 .
  • the driving voltage output by the power supply unit 400 is loaded on the first electrode of the electrowetting pixel device 500 through the first current limiting unit 600, and the driving voltage output by the power supply unit 400 is loaded on the first electrode of the electrowetting pixel device 500 through the second current limiting unit 700. on the second electrode of the pixel device 500 .
  • the first current limiting unit 600 and the second current limiting unit 700 function to limit current and prevent excessive current flowing through the electrowetting pixel device 500 from causing damage to the electrowetting pixel device 500 .
  • the first current limiting unit 600 includes a first resistor R1 , which is connected in series between the first electrode of the electrowetting pixel device 500 and the power supply unit 400 .
  • the second current limiting unit 700 includes a first resistor R1 .
  • Two resistors R2 are connected in series between the second electrode of the electrowetting pixel device 500 and the power supply unit 400 .
  • FIG. 6 shows a schematic structural diagram of an electrowetting display provided by an embodiment of the present application.
  • the electrowetting display includes a first substrate 601 , a second substrate 602 , a display panel 603 and the above-mentioned pixel driving circuit.
  • the display panel 603 is located between the first substrate 601 and the second substrate 602.
  • the display panel 603 includes electrowetting pixel devices arranged in an array, and the pixel driving circuit is electrically connected to the electrowetting pixel devices.
  • This electrowetting display can solve the problems of charge trapping and ink splitting that exist in traditional electrowetting displays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本申请提供了一种像素驱动电路及电润湿显示器，上述像素驱动电路包括时序控制单元、第一开关单元、第二开关单元和供电单元，供电单元用于提供恒定的驱动电压，一个控制周期中包括第一时间段和第二时间段，在第一时间段内，时序控制单元控制第一开关单元导通，控制第二开关单元断开，电润湿像素器件的第一电极与地导通；在第二时间段内，时序控制单元控制第一开关单元断开，控制第二开关单元导通，电润湿像素器件的第二电极与地导通。

Description

像素驱动电路及电润湿显示器
【相关申请的交叉引用】
本申请要求2022年3月28日提交的中国专利申请202210309153.9的优先权，其全部内容通过引用并入本文。
【技术领域】
本申请涉及显示技术领域，特别是涉及一种像素驱动电路及电润湿显示器。
【背景技术】
现有的主流显示器主要有LCD(Liquid Crystal Display，液晶显示器)显示器和OLED(Organic Light-Emitting Diode，有机发光二极管)显示器，而LCD显示器需要由背光模组作为光源，OLED显示器为有机发光材料在激发状态下主动发光，显示效果容易受到环境光影响，在环境光比较强烈的情况下，LCD显示器和OLED显示器均需要提高显示亮度来提高显示效果。
电润湿显示器由于其显示原理为反射发光，在强烈的光照环境下仍能保证良好的可见显示。电润湿显示器具有便携轻薄、柔性、高对比度、低功耗和响应速度快等优点，在显示领域占有一席之地。近年来，电润湿显示器的研究已经取得了良好的发展，但目前电润湿显示器存在电荷捕获和油墨分裂的问题。
【发明内容】
本申请实施例提供了一种像素驱动电路及电润湿显示器，可以解决电润湿显示器存在的电荷捕获和油墨分裂的问题。
第一方面，本申请实施例提供了一种像素驱动电路，应用于电润湿显示器，包括时序控制单元、第一开关单元、第二开关单元和供电单元，所述时序控制单元分别与所述第一开关单元的控制端和所述第二开关单元的控制端电连接，所述第一开关单元串接在电润湿像素器件的第一电极和地之间，所述第二开关单元串接在所述电润湿像素器件的第二电极和地之间，所述供电单元分别与所述电润湿像素器件的第一电极和所述电润湿像素器件的第二电极电连接；
所述供电单元用于提供恒定的驱动电压，所述时序控制单元用于周期性的控制所述第一开关单元和所述第二开关单元，一个控制周期中包括第一时间段 和第二时间段，在所述第一时间段内，所述时序控制单元控制所述第一开关单元导通，控制所述第二开关单元断开，使所述电润湿像素器件的第一电极与地导通；在所述第二时间段内，所述时序控制单元控制所述第一开关单元断开，控制所述第二开关单元导通，使所述电润湿像素器件的第二电极与地导通。
第二方面，本申请实施例提供了一种电润湿显示器，包括第一基板、第二基板、显示板和第一方面中任一项所述的像素驱动电路；
所述显示板设置于所述第一基板和所述第二基板之间，所述显示板包括阵列排布的电润湿像素器件，所述像素驱动电路与所述电润湿像素器件电连接。
本申请实施例与现有技术相比存在的有益效果是：
像素驱动电路对电润湿像素器件驱动时，时序控制单元用于周期性的控制第一开关单元和第二开关单元，使第一开关单元和第二开关单元周期性的导通和断开。一个控制周期中包括第一时间段和第二时间段，在第一时间段内，时序控制单元控制第一开关单元导通，控制第二开关单元断开，电润湿像素器件的第一电极与地导通，电润湿像素器件的第二电极与供电单元导通，供电单元输出的驱动电压驱动电润湿像素器件工作。第二时间段内，时序控制单元控制第一开关单元断开，控制第二开关单元导通，电润湿像素器件的第一电极与供电单元导通，电润湿像素器件的第二电极与地导通，供电单元输出的驱动电压驱动电润湿像素器件工作。在一个控制周期中，电润湿像素器件的第一电极和第二电极的电压差会发生翻转，可以防止电润湿像素器件的第一电极和第二电极上由于电荷积累导致出现电荷捕获和油墨分裂的问题。
【附图说明】
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一实施例提供的电润湿像素器件的结构示意图；
图2是本申请一实施例提供的像素驱动电路驱动电润湿像素器件的时序图；
图3是本申请一实施例提供的电润湿像素器件的连接示意图；
图4是本申请另一实施例提供的电润湿像素器件的结构示意图；
图5是本申请另一实施例提供的电润湿像素器件的连接示意图；
图6是本申请一实施例提供的电润湿显示器的结构示意图。
【具体实施方式】
以下描述中，为了说明而不是为了限定，提出了诸如特定系统结构、技术之类的具体细节，以便透彻理解本申请实施例。然而，本领域的技术人员应当清楚，在没有这些具体细节的其它实施例中也可以实现本申请。在其它情况中，省略对众所周知的系统、装置、电路以及方法的详细说明，以免不必要的细节妨碍本申请的描述。
应当理解，当在本申请说明书和所附权利要求书中使用时，术语“包括”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
如在本申请说明书和所附权利要求书中所使用的那样，术语“如果”可以依据上下文被解释为“当…时”或“一旦”或“响应于确定”或“响应于检测到”。类似地，短语“如果确定”或“如果检测到[所描述条件或事件]”可以依据上下文被解释为意指“一旦确定”或“响应于确定”或“一旦检测到[所描述条件或事件]”或“响应于检测到[所描述条件或事件]”。
另外，在本申请说明书和所附权利要求书的描述中，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
在本申请说明书中描述的参考“一个实施例”或“一些实施例”等意味着在本申请的一个或多个实施例中包括结合该实施例描述的特定特征、结构或特点。由此，在本说明书中的不同之处出现的语句“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等不是必然都参考相同的实施例，而是意味着“一个或多个但不是所有的实施例”，除非是以其他方式另外特别强调。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
电润湿像素器件的工作原理为：在电润湿像素器件的第一电极和第二电极之间加载直流驱动电压，使电润湿像素器件中的油墨实现收缩和扩张，从而实现光学开关的作用。当电润湿像素器件的第一电极和第二电极上未加载电压时，油墨均匀地在绝缘介质表层展开，电润湿像素器件呈现油墨颜色的全暗状态，即电润湿像素器件处于“关闭”状态。当电润湿像素器件的第一电极和第二电极上加载电压时，油墨开始收缩，在驱动电压和表面张力的作用下向一侧缩成 油滴状，电润湿像素器件呈现出反射基板颜色的状态，即电润湿像素器件处于“打开”状态。
目前控制电润湿像素器件中油墨收缩程度的驱动方式主要是调整加载在第一电极和第二电极上直流电压的大小，电压越大油墨收缩程度越大，电润湿像素器件的灰阶亮度越高。但长时间在电润湿像素器件的第一电极和第二电极上加载直流电压容易导致电润湿像素器件出现电荷捕获现象和油墨分裂现象，造成灰阶电压偏离，油墨恢复慢或者无法恢复的问题。
实施例一
基于上述问题，本申请实施例提供了一种像素驱动电路，如图1所示，像素驱动电路包括时序控制单元100、第一开关单元200、第二开关单元300和供电单元400，时序控制单元100分别与第一开关单元200的控制端和第二开关单元300的控制端电连接，第一开关单元200串接在电润湿像素器件500的第一电极和地之间，第二开关单元300串接在电润湿像素器件500的第二电极和地之间，供电单元400分别与电润湿像素器件500的第一电极和电润湿像素器件500的第二电极电连接。
具体的，像素驱动电路对电润湿像素器件500驱动时，时序控制单元100用于周期性的控制第一开关单元200和第二开关单元300，使第一开关单元200和第二开关单元300周期性的导通和断开。一个控制周期中包括第一时间段和第二时间段，在第一时间段内，时序控制单元100控制第一开关单元200导通，控制第二开关单元300断开，电润湿像素器件500的第一电极与地导通，电润湿像素器件500的第二电极与供电单元400导通，供电单元400输出的驱动电压驱动电润湿像素器件500工作。第二时间段内，时序控制单元100控制第一开关单元200断开，控制第二开关单元300导通，电润湿像素器件500的第一电极与供电单元400导通，电润湿像素器件500的第二电极与地导通，供电单元400输出的驱动电压驱动电润湿像素器件500工作。在一个控制周期中，电润湿像素器件500的第一电极和第二电极之间的电压差会发生翻转，可以防止电润湿像素器件500的第一电极和第二电极上由于电荷积累导致出现电荷捕获和油墨分裂的问题。
本申请的一个实施例中，一个控制周期中还包括第三时间段和第四时间段，在第三时间段内，时序控制单元100控制第一开关单元200导通，控制第二开关单元300导通，使电润湿像素器件500的第一电极和第二电极均与地导通， 此时电润湿像素器件500不工作。在第四时间段内，时序控制单元100控制第一开关单元200断开，控制第二开关单元300断开，使电润湿像素器件500的第一电极和第二电极均与供电单元400导通，此时电润湿像素器件500不工作。第三时间段位于第一时间段和第二时间段之间，或者，第四时间段位于第一时间段和第二时间段之间。
具体的，电润湿像素器件500在第一时间段和第二时间段内均处于工作状态，并且电润湿像素器件500由第一时间段进入到第二时间段时，电润湿像素器件500的第一电极和第二电极的电压发生翻转。电润湿像素器件500在第三时间段和第四时间段时不工作，第三时间段位于第一时间段和第二时间段之间，或者，第四时间段位于第一时间段和第二时间段之间，可以使电润湿像素器件500由工作状态转换为不工作状态，再由不工作状态转换为工作状态，防止电润湿像素器件500的第一电极和第二电极长时间加载直流电压造成的电荷积累出现电荷捕获的问题。电润湿像素器件500中的油墨由收缩状态转换为展开状态，再由展开状态切换为收缩状态，使油墨能够实现快速的收缩和展开，防止出现油墨分裂现象。
示例性的，如图2所示，时序控制单元100的一个驱动周期包括T1、T2、T3和T4，时序控制单元100输出第一脉冲信号PWM1控制第一开关单元200，时序控制单元100输出第二脉冲信号PWM2控制第二开关单元300。
在T1时间段，第一脉冲信号PWM1为高电平，第二脉冲信号PWM2为低电平，第一开关单元200导通，第二开关单元300断开，电润湿像素器件500的第一电极的电压为0，电润湿像素器件500的第二电极的电压为V，电润湿像素器件500的第一电极和第二电极的电压差为-V，电润湿像素器件500中的油墨收缩。
在T2时间段，第一脉冲信号PWM1为高电平，第二脉冲信号PWM2为高电平，第一开关单元200导通，第二开关单元300导通，电润湿像素器件500的第一电极的电压为0，电润湿像素器件500的第二电极的电压为0，电润湿像素器件500的第一电极和第二电极的电压差为0，电润湿像素器件500中的油墨展开，恢复到初始状态。
在T3时间段，第一脉冲信号PWM1为低电平，第二脉冲信号PWM2为高电平，第一开关单元200断开，第二开关单元300导通，电润湿像素器件500的第一电极的电压为V，电润湿像素器件500的第二电极的电压为0，电润湿像 素器件500的第一电极和第二电极的电压差为V，电润湿像素器件500中的油墨收缩。
在T4时间段，第一脉冲信号PWM1为低电平，第二脉冲信号PWM2为低电平，第一开关单元200断开，第二开关单元300断开，电润湿像素器件500的第一电极的电压为V，电润湿像素器件500的第二电极的电压为V，电润湿像素器件500的第一电极和第二电极的电压差为0，电润湿像素器件500中的油墨展开，恢复到初始状态。
传统电润湿像素器件500通过改变供电单元400的输出电压进行灰阶亮度的调节。本申请的像素驱动电路通过控制第一脉冲信号PWM1的占空比和第二脉冲信号PWM2的占空比，可以实现电润湿像素器件500灰阶亮度的调节，只需要供电单元400提供一个恒定的直流驱动电压，将低了供电单元400的要求，进而能够降低像素驱动电路的设计生产成本。
如图3所示，第一开关单元200包括第一开关管Q1，第一开关管Q1的控制端与时序控制单元100电连接，第一开关管Q1串接在电润湿像素器件500的第一电极和地之间。
具体的，时序控制单元100输出的第一控制信号控制第一开关管Q1导通或断开。示例性的，当时序控制单元100输出的第一控制信号为高电平时，第一开关管Q1导通，电润湿像素器件500的第一电极与地导通，此时电润湿像素器件500的第一电极电压为0。当时序控制单元100输出的第一控制信号为低电平时，第一开关管Q1断开，电润湿像素器件500的第一电极与地不导通，此时电润湿像素器件500的第一电极电压为供电单元400提供的驱动电压。
示例性的，第一开关管Q1为NMOS管。
如图3所示第二开关单元300包括第二开关管Q2，第二开关管Q2的控制端与时序控制单元100电连接，第二开关管Q2串接在电润湿像素器件500的第二电极和地之间。
具体的，时序控制单元100输出的第二控制信号控制第二开关管Q2导通或断开。示例性的，当时序控制单元100输出的第二控制信号为高电平时，第二开关管Q2导通，电润湿像素器件500的第二电极与地导通，此时电润湿像素器件500的第二电极电压为0。当时序控制单元100输出的第二控制信号为低电平时，第二开关管Q2断开，电润湿像素器件500的第二电极与地不导通，此时电润湿像素器件500的第二电极电压为供电单元400提供的驱动电压。
示例性的，第二开关管Q2为NMOS管。
实施例二
图4示出了本申请另一实施例提供的电润湿像素器件500的结构示意图。参见图4所示，像素驱动电路还包括第一限流单元600和第二限流单元700，第一限流单元600串接在电润湿像素器件500的第一电极和供电单元400之间，第二限流单元700串接在电润湿像素器件500的第二电极和供电单元400之间。
具体的，供电单元400输出的驱动电压通过第一限流单元600加载在电润湿像素器件500的第一电极上，供电单元400输出的驱动电压通过第二限流单元700加载在电润湿像素器件500的第二电极上。第一限流单元600和第二限流单元700起到限制电流的作用，防止流经电润湿像素器件500的电流过大对电润湿像素器件500造成损坏。
如图5所示，第一限流单元600包括第一电阻R1，第一电阻R1串接在电润湿像素器件500的第一电极和供电单元400之间，第二限流单元700包括第二电阻R2，第二电阻R2串接在电润湿像素器件500的第二电极和供电单元400之间。
具体的，设计人员可以根据实际需求对第一电阻R1的阻值和第二电阻R2的阻值进行设定，以实现恰当的限流效果，保护电润湿像素器件500不被损坏。
实施例三
图6示出了本申请一实施例提供的电润湿显示器的结构示意图。参见图6所示，电润湿显示器包括第一基板601、第二基板602、显示板603和上述的像素驱动电路。显示板603位于第一基板601和第二基板602之间，显示板603包括阵列排布的电润湿像素器件，像素驱动电路与电润湿像素器件电连接。该电润湿显示器能够解决传统电润湿显示器存在的电荷捕获和油墨分裂的问题，具体工作原理请参见上述像素驱动电路的描述，在此不再赘述。
以上所述实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围，均应包含在本申请的保护范围之内。

Claims (20)

  1. 一种像素驱动电路，应用于电润湿显示器，其特征在于，包括时序控制单元、第一开关单元、第二开关单元和供电单元，所述时序控制单元分别与所述第一开关单元的控制端和所述第二开关单元的控制端电连接，所述第一开关单元串接在电润湿像素器件的第一电极和地之间，所述第二开关单元串接在所述电润湿像素器件的第二电极和地之间，所述供电单元分别与所述电润湿像素器件的第一电极和所述电润湿像素器件的第二电极电连接；
    所述供电单元用于提供恒定的驱动电压，所述时序控制单元用于周期性的控制所述第一开关单元和所述第二开关单元，一个控制周期中包括第一时间段和第二时间段，在所述第一时间段内，所述时序控制单元控制所述第一开关单元导通，控制所述第二开关单元断开，使所述电润湿像素器件的第一电极与地导通；在所述第二时间段内，所述时序控制单元控制所述第一开关单元断开，控制所述第二开关单元导通，使所述电润湿像素器件的第二电极与地导通。
  2. 根据权利要求1所述的像素驱动电路，其特征在于，在一个控制周期中，所述电润湿像素器件的第一电极和第二电极之间的电压差会发生翻转。
  3. 根据权利要求1所述的像素驱动电路，其特征在于，所述一个控制周期中还包括第三时间段和第四时间段，在所述第三时间段内，所述时序控制单元控制所述第一开关单元导通，控制所述第二开关单元导通，使所述电润湿像素器件的第一电极和第二电极均与地导通；在所述第四时间段内，所述时序控制单元控制所述第一开关单元断开，控制所述第二开关单元断开，使所述电润湿像素器件的第一电极和第二电极均与所述供电单元导通；
  4. 根据权利要求3所述的像素驱动电路，其特征在于，所述第三时间段位于所述第一时间段和所述第二时间段之间，或者，所述第四时间段位于所述第一时间段和所述第二时间段之间。
  5. 根据权利要求3所述的像素驱动电路，其特征在于，所述电润湿像素器件在所述第一时间段和所述第二时间段内处于工作状态，所述电润湿像素器件在所述第三时间段和所述第四时间段内不工作。
  6. 根据权利要求4所述的像素驱动电路，其特征在于，所述电润湿像素器件由工作状态转换为不工作状态，再由不工作状态转换为工作状态。
  7. 根据权利要求6所述的像素驱动电路，其特征在于，所述电润湿像素器件中的油墨由收缩状态转换为展开状态，再由展开状态切换为收缩状态。
  8. 根据权利要求1所述的像素驱动电路，其特征在于，所述第一开关单元由所述时序控制单元输出的第一脉冲信号控制，所述第二开关单元由所述时序控制单元输出的第二脉冲信号控制；
    所述电润湿像素器件的灰阶亮度与所述第一脉冲信号和所述第二脉冲信号的占空比相关。
  9. 根据权利要求1所述的像素驱动电路，其特征在于，所述像素驱动电路还包括第一限流单元和第二限流单元，所述第一限流单元串接在所述电润湿像素器件的第一电极和所述供电单元之间，所述第二限流单元串接在所述电润湿像素器件的第二电极和所述供电单元之间。
  10. 根据权利要求9所述的像素驱动电路，其特征在于，所述第一限流单元包括第一电阻，所述第一电阻串接在所述电润湿像素器件的第一电极和所述供电单元之间。
  11. 根据权利要求9所述的像素驱动电路，其特征在于，所述第二限流单元包括第二电阻，所述第二电阻串接在所述电润湿像素器件的第二电极和所述供电单元之间。
  12. 根据权利要求9所述的像素驱动电路，其特征在于，所述供电单元输出的驱动电压通过所述第一限流单元加载至所述电润湿像素器件的第一电极上，以及通过所述第二限流单元加载至所述电润湿像素器件的第二电极上。
  13. 根据权利要求1或权利要求3所述的像素驱动电路，其特征在于，所述第一开关单元包括第一开关管，所述第一开关管的控制端与所述时序控制单元电连接，所述第一开关管串接在所述电润湿像素器件的第一电极和地之间。
  14. 根据权利要求13所述的像素驱动电路，其特征在于，所述第一开关管为NMOS管。
  15. 根据权利要求14所述的像素驱动电路，其特征在于，所述第一开关管由所述时序控制单元输出的第一控制信号控制，所述第一控制信号为高电平时，所述第一开关管导通，所述第一控制信号为低电平时，所述第一开关管断开。
  16. 根据权利要求1所述的像素驱动电路，其特征在于，所述第二开关单元包括第二开关管，所述第二开关管的控制端与所述时序控制单元电连接，所述第二开关管串接在所述电润湿像素器件的第二电极和地之间。
  17. 根据权利要求16所述的像素驱动电路，其特征在于，所述第二开关管为NMOS管。
  18. 根据权利要求17所述的像素驱动电路，其特征在于，所述第二开关管 由所述时序控制单元输出的第二控制信号控制，所述第二控制信号为高电平时，所述第二开关管导通，所述第二控制信号为低电平时，所述第二开关管断开。
  19. 一种电润湿显示器，其特征在于，包括第一基板、第二基板、显示板和像素驱动电路；
    其中，所述像素驱动电路包括时序控制单元、第一开关单元、第二开关单元和供电单元，所述时序控制单元分别与所述第一开关单元的控制端和所述第二开关单元的控制端电连接，所述第一开关单元串接在电润湿像素器件的第一电极和地之间，所述第二开关单元串接在所述电润湿像素器件的第二电极和地之间，所述供电单元分别与所述电润湿像素器件的第一电极和所述电润湿像素器件的第二电极电连接；所述供电单元用于提供恒定的驱动电压，所述时序控制单元用于周期性的控制所述第一开关单元和所述第二开关单元，一个控制周期中包括第一时间段和第二时间段，在所述第一时间段内，所述时序控制单元控制所述第一开关单元导通，控制所述第二开关单元断开，使所述电润湿像素器件的第一电极与地导通；在所述第二时间段内，所述时序控制单元控制所述第一开关单元断开，控制所述第二开关单元导通，使所述电润湿像素器件的第二电极与地导通。
  20. 根据权利要求19所述的电润湿显示器，其特征在于，所述显示板设置于所述第一基板和所述第二基板之间，所述显示板包括阵列排布的电润湿像素器件，所述像素驱动电路与所述电润湿像素器件电连接。
PCT/CN2022/137320 2022-03-28 2023-01-06 像素驱动电路及电润湿显示器 WO2023185079A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020247019945A KR20240104170A (ko) 2022-03-28 2023-01-06 픽셀 구동 회로 및 전기 습윤 디스플레이
US18/513,646 US12125450B2 (en) 2022-03-28 2023-11-20 Pixel driving circuit and electrowetting display

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210309153.9A CN114446253B (zh) 2022-03-28 2022-03-28 像素驱动电路及电润湿显示器
CN202210309153.9 2022-03-28

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/513,646 Continuation US12125450B2 (en) 2022-03-28 2023-11-20 Pixel driving circuit and electrowetting display

Publications (1)

Publication Number Publication Date
WO2023185079A1 true WO2023185079A1 (zh) 2023-10-05

Family

ID=81359102

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/137320 WO2023185079A1 (zh) 2022-03-28 2023-01-06 像素驱动电路及电润湿显示器

Country Status (3)

Country Link
KR (1) KR20240104170A (zh)
CN (1) CN114446253B (zh)
WO (1) WO2023185079A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114446253B (zh) * 2022-03-28 2022-10-28 绵阳惠科光电科技有限公司 像素驱动电路及电润湿显示器
CN115113453B (zh) * 2022-07-27 2022-11-08 惠科股份有限公司 显示面板

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101963733A (zh) * 2010-05-19 2011-02-02 友达光电股份有限公司 电泳式显示元件
CN102129843A (zh) * 2010-01-15 2011-07-20 希毕克斯影像有限公司 具有可变帧时间的驱动方法
TW201128223A (en) * 2010-02-06 2011-08-16 Ind Tech Res Inst Electrowetting display device and method of controlling electrowetting effect
CN104025179A (zh) * 2011-12-20 2014-09-03 利奎阿维斯塔股份有限公司 电湿润显示装置的驱动
CN114446253A (zh) * 2022-03-28 2022-05-06 绵阳惠科光电科技有限公司 像素驱动电路及电润湿显示器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010085817A (ja) * 2008-10-01 2010-04-15 Seiko Epson Corp 電気泳動表示装置および電子機器、電気泳動表示装置の駆動方法
JP7083100B2 (ja) * 2017-09-29 2022-06-10 天馬微電子有限公司 光線方向制御素子及びこれを用いた表示装置、照明装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102129843A (zh) * 2010-01-15 2011-07-20 希毕克斯影像有限公司 具有可变帧时间的驱动方法
TW201128223A (en) * 2010-02-06 2011-08-16 Ind Tech Res Inst Electrowetting display device and method of controlling electrowetting effect
CN101963733A (zh) * 2010-05-19 2011-02-02 友达光电股份有限公司 电泳式显示元件
CN104025179A (zh) * 2011-12-20 2014-09-03 利奎阿维斯塔股份有限公司 电湿润显示装置的驱动
CN114446253A (zh) * 2022-03-28 2022-05-06 绵阳惠科光电科技有限公司 像素驱动电路及电润湿显示器

Also Published As

Publication number Publication date
US20240087540A1 (en) 2024-03-14
CN114446253A (zh) 2022-05-06
CN114446253B (zh) 2022-10-28
KR20240104170A (ko) 2024-07-04

Similar Documents

Publication Publication Date Title
WO2023185079A1 (zh) 像素驱动电路及电润湿显示器
US6693610B2 (en) Active matrix electroluminescent display device
JP4681785B2 (ja) アクティブマトリクスエレクトロルミネッセンス表示装置
JP4346636B2 (ja) 液晶表示装置
WO2017054406A1 (zh) 像素驱动电路、像素电路、显示面板和显示装置
WO2018049866A1 (zh) 像素驱动电路及像素驱动方法、阵列基板以及显示装置
US11475855B2 (en) Backlight module and display device
US7924262B2 (en) Light source driving apparatus, display device having the same and method of driving a light source
CN104091570B (zh) 背光电路及其驱动方法、背光模组、显示装置
US9095024B1 (en) Backlight driving circuit and method for reducing soft-start time thereof
US20060066526A1 (en) Driving apparatus for organic electro-luminescence display device
CN101210846A (zh) 环境光传感器电路和具有该电路的平板显示设备
TWI381207B (zh) 液晶顯示器
US8581835B2 (en) Electro-optical device, method for driving electro-optical device, control circuit and electronic apparatus
US20080180426A1 (en) Luminance control methods and display devices
US7566852B2 (en) Driving circuit for backlight module
CN110706657A (zh) 一种像素电路及显示装置
US12125450B2 (en) Pixel driving circuit and electrowetting display
KR100751476B1 (ko) 능동 매트릭스 전계 발광 디스플레이 장치
KR101216172B1 (ko) 액정 표시 장치
JP3906103B2 (ja) エレクトロルミネッセンス素子およびエレクトロルミネッセンス表示装置
KR100370032B1 (ko) 발광소자의 구동제어회로 및 그 방법
JP4572799B2 (ja) 液晶表示装置
KR20110026788A (ko) 발광 다이오드 패키지 및 그를 이용한 광원 장치
CN100573640C (zh) 聚合物电致发光显示器驱动电路装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22934897

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2024533145

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 1020247019945

Country of ref document: KR