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Device and method for driving luminous display panel

A technology of light-emitting display and driving device, applied in static indicators, instruments, electrical components, etc., can solve the problem of not being able to release the charge immediately, and not being able to apply reverse bias to the EL element.

Inactive Publication Date: 2004-05-12
PIONEER TOHOKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Therefore, even if reverse bias is applied to the common anode and common cathode, due to the presence of the driving TFT 12 exhibiting high impedance, the charge accumulated in the forward bias in the parasitic capacitance of the EL element cannot be released immediately, and as a result there is an inability to Problems of Effectively Applying Reverse Bias to EL Elements

Method used

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  • Device and method for driving luminous display panel
  • Device and method for driving luminous display panel
  • Device and method for driving luminous display panel

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Embodiment Construction

[0036] The driving device of the light-emitting display panel according to the present invention will be described below according to the embodiments shown in the accompanying drawings. In addition, in the following description, equivalent to the above figure 1 And the parts of each part demonstrated in FIG. 2 are denoted by the same code|symbol. First, FIG. 3 is a block diagram showing a first embodiment of the driving device according to the present invention. In FIG. 3 , an input analog image signal is supplied to a drive control circuit 21 and an analog / digital (A / D) converter 22 . The drive control circuit 21 generates an analog signal for the A / D converter 22 and a signal for writing to and reading from the frame memory 23 based on the horizontal synchronizing signal and the vertical synchronizing signal in the analog image signal.

[0037] The A / D converter 22 samples the input analog image signal based on the clock signal supplied from the drive control circuit 21 , ...

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Abstract

Provided is an active matrix type EL display device, which is constructed in the way a reverse bias voltage is effectively applied to the EL element without decreasing the light-up time period percentage. The EL element 14 constituting one pixel 10 is light-up driven by a control TFT 11 and a drive TFT 12. To a cathode line C1 having commonly connected thereto the cathode sides of the EL elements 14 arrayed correspondingly to a scanning line A1, there is applied a forward-directional voltage that is determined using the voltage level of a common anode 16 as a reference, or a reverse bias voltage. In a case where a reverse bias voltage has been applied to the cathode line C1, a diode 15 becomes electrically conductive through bypassing the drive TFT 12. By this, it is possible to effectively apply a reverse bias voltage to the EL element. For example, in case where making concurrent use of a simultaneous erasure scan method (SES) in the time division gradation expression means, it is also possible to avoid the problem that the light-up time period percentage of the EL element is decreased.

Description

technical field [0001] The present invention relates to a display panel driving device for actively driving light-emitting elements constituting pixels, for example, by using TFTs, and more particularly to a display panel driving device and a driving method capable of effectively applying a reverse bias voltage to the light-emitting elements. Background technique [0002] The development of a display using a display panel configured by arranging light emitting elements in a matrix shape has made considerable progress. As a light-emitting element used in such a display panel, for example, an organic EL (electroluminescence) element using an organic material for a light-emitting layer is particularly noteworthy. The background is that practically high efficiency and long life are realized by using an organic compound that can be expected to obtain good light-emitting characteristics in the light-emitting layer of an EL element. [0003] As a display...

Claims

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Application Information

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IPC IPC(8): H01L51/50G09G3/20G09G3/30G09G3/32
CPCG09G2320/043G09G3/325G09G2310/0251G09G2300/043G09G2300/0866G09G2320/0209G09G3/3233G09G3/3241G09G3/2022G09G2310/0256G09G3/30
Inventor 金内一浩
Owner PIONEER TOHOKU CORP