Polymer‐based transistors used as pixel switches in active‐matrix displays

Huitema, Edzer; Putten, Bas van der; Cantatore, Eugenio; Kuijk, K. E.; Hart, K.; Leeuw, Dago de

doi:10.1889/1.1827867

Cited by 18 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The specifications of our display are summarized in Table 1. The TFT requirements for a QVGA display, having 240 lines and 320 columns, driven at 50Hz frame rate are a mobility of 0.01cm 2 /Vs and a current modulation of 2x10 4 [6]. The performance of our organic TFTs is therefore excellent for this display.…”

Section: Flexible Qvga Active-matrix Electrophoretic Displaymentioning

confidence: 94%

45.1: System‐on‐Plastic with Organic Electronics: A Flexible QVGA Display and Integrated Drivers

Lieshout

Huitema

Veenendaal

et al. 2004

Symp Digest of Tech Papers

View full text Add to dashboard Cite

1 A flexible 4.7-inch QVGA active-matrix electrophoretic display is demonstrated, containing 76800 solution-processed organic transistors. In the same technology, 32-and 120-stage row drivers are produced with adequate speed to drive a QVGA display. Both the display and the drivers are highly flexible. Bending the display to a radius below 2cm does not result in any performance loss. 1. Objectives and background Flexible displays have been demonstrated based on liquid crystal [1], polymer light-emitting diodes [2] and electrophoretic ink [3]. The use of TFTs based on solution-processed organic materials in flexible active-matrix displays [4] has a number of advantages over conventional techniques using mainly inorganic materials. It simplifies the display manufacturing process compared to the conventional chemical vapor deposition techniques. The processing temperature is as low as 170°C [5], creating the possibility to use a wide range of plastic substrates instead of glass. Furthermore, the mechanical properties of organic materials are compatible with plastic substrates.Standard technologies, such as chip bonding or chip-on-glass, currently common in flat displays to make the connections with the driver electronics, cannot be used easily in flexible rollable displays. The reason is that all connections of a rollable display must be routed to one side, resulting in a large footprint. Moreover, the connection to the drivers will become unreliable due to the small pitch of the connections and the difference in expansion coefficient between the drivers and the display foil. Therefore integration of shift registers on a rollable display is very beneficial.Here we demonstrate the use of organic solution-processed insulator and semiconductor materials in a flexible QVGA display as well as in shift registers. These devices are produced using the same technology and will be integrated in the near future. TechnologyThe bottom-gate thin-film transistor (TFT) layout is shown in Figure 1. The devices are processed on 6-inch, 25µm thin plastic substrates. Processing starts with the gate layer that is obtained by deposition of gold (25nm) followed by structuring. Next, a 350nm thick photo-imageable polymer insulator layer is applied from solution. A second patterned gold layer formes the source-drain layer. On top of this stack, the organic p-type semiconductor pentacene is applied by spin-coating. This results in a pentacene film with a thickness of 50nm, which can then be structured photo-lithographically.

show abstract

Section: Flexible Qvga Active-matrix Electrophoretic Displaymentioning

confidence: 94%

45.1: System‐on‐Plastic with Organic Electronics: A Flexible QVGA Display and Integrated Drivers

Lieshout

Huitema

Veenendaal

et al. 2004

Symp Digest of Tech Papers

View full text Add to dashboard Cite

show abstract

“…In order to charge the large pixel capacitance within the short selection time T s , an OTFT with a large current drivability and high switching speed is required. The display performance of the LCD has been analyzed previously 2,14,15 . In our display, the required nor-malized mobility µW/L and on-current are estimated to be more than 1.4 cm 2 /V-sec and 25 µA.…”

Section: Otft Performancementioning

confidence: 99%

“…Many research institutes are developing various types of flexible displays aimed at practical applications. [1][2][3][4][5][6][7] Among such flexible displays, those based on liquid crystal (LC) are the most attractive because they offer easy realization of full-color capability, stable characteristics, and well-established manufacturing processes compared to other types of active-matrix displays. Several groups have reported flexible LCDs using various approaches, such as bistable cholesteric LC technology.…”

Section: Introductionmentioning

confidence: 99%

A 5‐in. flexible ferroelectric liquid‐crystal display driven by organic thin‐film transistors

Fujisaki¹,

Sato²,

Takei³

et al. 2008

J Soc Info Display

View full text Add to dashboard Cite

Abstract— An organic thin‐film‐transistor (OTFT) driven color flexible ferroelectric‐liquid‐crystal (FLC) display with 160 × 120 pixels and a resolution of 50 ppi has been developed. The flexible FLC was fabricated on a pentacene‐OTFT array using printing and lamination techniques. To drive the display at a fast driving speed, an OTFT was developed with a short channel length having a large current output. The fabricated OTFT array with a channel length of 5 μm exhibits a carrier mobility of 0.3 cm2/V‐sec and an ON/OFF ratio of over 107 at a low drain voltage of −6 V. A field‐sequential‐color system with a flexible backlight unit was also developed and used to drive the display. Color moving images were successively shown on the 5‐in. display using an active‐matrix driving technique of the OTFT.

show abstract

“…In this paper, we will use active-matrix organic polymer light-emitting displays (AMPLED -emissive FPD) and active-matrix liquid-crystal displays (AMLCDs -transmissive FPD) as examples. Organic TFTs are already being investigated for the addressing of AMLCDs and small active-matrix reflective displays, based on PDLC technology, have been demonstrated using both polymer 28,29 and small molecule organic semiconductors. 30 The level of ON-current that the OP-TFTs can provide is an important issue for active-matrix addressing in FPDs.…”

Section: All-organic Active-matrix Op-tft Arraysmentioning

confidence: 99%

Organic‐polymer thin‐film transistors for active‐matrix flat‐panel displays?

Martin¹,

Hamilton²,

Kanicki³

2003

J Soc Info Display

View full text Add to dashboard Cite

-Organic-polymer-based thin-film transistors (OP-TFTs) look very promising for flexible, large-area, and low-cost organic electronics. In this paper, we describe devices based on spin-coated organic polymer that reproducibly exhibit field-effect mobility values around 5×10 -3 cm 2 /V-sec. We also address fabrication, performance, and stability issues that are critical for the use of such devices in active-matrix flat-panel displays.

show abstract

Polymer‐based transistors used as pixel switches in active‐matrix displays

Cited by 18 publications

References 26 publications

45.1: System‐on‐Plastic with Organic Electronics: A Flexible QVGA Display and Integrated Drivers

45.1: System‐on‐Plastic with Organic Electronics: A Flexible QVGA Display and Integrated Drivers

A 5‐in. flexible ferroelectric liquid‐crystal display driven by organic thin‐film transistors

Organic‐polymer thin‐film transistors for active‐matrix flat‐panel displays?

Contact Info

Product

Resources

About