Driving method for display panel

• US 10,147,373 B2
• Filed: 06/06/2017
• Issued: 12/04/2018
• Est. Priority Date: 03/29/2017
• Status: Active Grant

• Current Assignee: Giantplus Technology Company Limited (TOPPAN Holdings, Inc.)
• Original Assignee: Giantplus Technology Company Limited (TOPPAN Holdings, Inc.)
• Inventors: Lin, Yu-Yen, Li, Hou-Hong
• Primary Examiner(s): Taylor, Jr., Duane N
• Application Number:
  US15/615,792
• Publication Number:
  US 20180286334A1
• Time in Patent Office: 546 Days
• Field of Search: None
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0417 Special arrangements specific to the use of low carrier mobility technology
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3633 with transmission/voltage characteristic comprising multiple loops, e.g. antiferroelectric liquid crystals
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes

Abstract

A driving method for a display panel is provided. The display panel includes a plurality of pixel circuits arranged in an array. Each of the pixel circuits respectively includes a first switch and a second switch coupled in series. The driving method for the display panel includes following steps. Plural first pulse signals are periodically received in a de-stress mode through a control terminal of the first switch of each of the pixel circuits, where the first pulse signals include a first pulse width. Plural second pulse signals are sequentially and periodically received in the de-stress mode through a control terminal of the second switch of each of the pixel circuits, where the second pulse signals include a second pulse width, and each of the pixel circuits receives the first pulse signals and the second pulse signals at different times.

Claims

1. A driving method for a display panel having a plurality of pixel circuits arranged in an array, each of the pixel circuits comprises at least one first switch and a second switch coupled in series, and comprises a storage capacitor and a liquid crystal capacitor respectively coupled to the at least one first switch and a second switch in series, the driving method comprising:

periodically receiving a plurality of first pulse signals in a de-stress mode through a control terminal of the at least one first switch of each of the pixel circuits, wherein the first pulse signals have a first pulse width; and

sequentially and periodically receiving a plurality of second pulse signals in the de-stress mode through a control terminal of the second switch of each of the pixel circuits, wherein the second pulse signals have a second pulse width, and each of the pixel circuits receives the first pulse signals and the second pulse signals at different times, respectively,

wherein the each of the pixel circuits does not charge or discharge the storage capacitor and the liquid crystal capacitor through a source signal line in the de-stress mode.

2. The driving method of claim 1, wherein a first time interval exists between the time at which the first pulse signals are received by the pixel circuits and the time at which the second pulse signals are received by at least one of the pixel circuits.

3. The driving method of claim 1, wherein a second time interval exists between the control terminal of the second switch of each of the pixel circuits in each row, so as to sequentially receive the second pulse signals.

4. The driving method of claim 1, wherein a second time interval exists between the control terminal of the second switch of each of the pixel circuits in odd rows and the control terminal of the second switch of each of the pixel circuits in even rows, so as to alternately receive the second pulse signals.

5. The driving method of claim 1, wherein the control terminal of the second switch of each of the pixel circuits simultaneously receives the second pulse signals.

6. The driving method of claim 1, wherein the first pulse signals have a first high-level voltage and a first low-level voltage, and the step of periodically receiving the first pulse signals in the de-stress mode by the control terminal of the at least one first switch of each of the pixel circuits comprises:

adjusting at least one of the first high-level voltage and the first low-level voltage of the first pulse signals.

7. The driving method of claim 1, wherein the second pulse signals have a second high-level voltage and a second low-level voltage, and the step of sequentially and periodically receiving the second pulse signals in the de-stress mode by the control terminal of the second switch of each of the pixel circuits comprises:

adjusting at least one of the second high-level voltage and the second low-level voltage of the second pulse signals.

8. The driving method of claim 1, wherein the de-stress mode is applicable when the display panel is being operated in at least one of a power-on state, a power-off state, and a standby state.

9. The driving method of claim 1, wherein the at least one first switch of each of the pixel circuits of the display panel comprises two first switches, one of the two first switches, the second switch, and the other of the two first switches are sequentially coupled in series, and the control terminal of one of the two first switches is coupled to the control terminal of the other of the two first switches.

10. The driving method of claim 1, wherein a screen refresh rate of the display panel is smaller than or equal to 30 Hz.