Tohoku Pioneer Corporation

Koji Henmi

Naoki Yazawa

Gen Suzuki

Keisuke Moriya

Takeshi Okuyama

Masato Togashi

Daisuke Fujita

Provided is a driving device that enables compensating for the decrease in luminance characteristic due to the aging of an EL display panel. On a transparent substratemade of, for example, glass, there are lamination-formed a number of luminescent elements. By this, a light from the luminescent element is radiated, via the transparent substrate, in a direction of its intersecting a substrate surface thereof, thereby a display image is formed. The driving device is equipped with photo-electric conversion meansthat, when receiving part of the light from the luminescent elementthat, by using as the interface a substrate surface of the transparent substrateor a substrate surface of a light-guiding substratedisposed on the transparent substratein a laminated state, is reflected within the substrate, produces an electric signal, as well as drive power setting meansthat sets a luminescent drive power that is supplied to each of the luminescent elements. By this construction, it is possible to compensate for the decrease in luminance characteristic due to, for example, the aging of the luminescent element

Device for and method of driving luminescent display panel

In an apparatus for driving a luminescent display panel, in a state in which scanning lines are sequentially scanned to drive and illuminate light-emitting elements, a voltage peak value arising in a scanning line in a non-scanning state is held by a capacitor through parasitic capacitance of the light-emitting element in a non-scanning state. On the basis of the voltage value held by the capacitor, a reverse bias voltage to be output from a reverse bias voltage generation circuit is controlled, and the voltage is supplied to the scanning lines.

Apparatus and method for driving luminescent display panel

In a drive method of a light-emitting display panel capable of emitting light in low luminance, the parasitic capacitances of the light-emitting elements disposed in the light-emitting display panel are precharged making use of a reverse bias voltage before they are lit. In this case, a reverse bias voltage created by a reverse bias voltage creation circuit or a peak current being precharged is controlled by selectively grounding control terminals based on dimmer control. In particular, when the light-emitting elements are emitted in low luminance, the reverse bias voltage is output in a low level, thereby the light-emitting elements are prevented from being precharged with an excessive voltage. The above arrangement can realize light emission control in low luminance.

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Yonezawa, Japan

Koji Henmi