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Drive apparatus and drive method for light emitting display panel

A technology of light-emitting display and driving device, which is applied to lighting devices, electroluminescent light sources, light sources, etc., and can solve the problems of complicated operation, rising product cost, and enlarged circuit structure scale.

Active Publication Date: 2006-11-22
TOHOKU PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a special unit for performing the above-mentioned control is required, the operation is complicated, and the scale of the circuit structure is also increased, which becomes an important cause of an increase in product cost.

Method used

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  • Drive apparatus and drive method for light emitting display panel
  • Drive apparatus and drive method for light emitting display panel
  • Drive apparatus and drive method for light emitting display panel

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0038] Next, the driving device of the light-emitting display panel of the present invention will be described based on the illustrated embodiment. Figure 5 represents its first embodiment, the Figure 5 Use the same notation to represent implementations and based on image 3 Each part in the description has the same function, so detailed description thereof will be appropriately omitted.

[0039] Transistor Q1 as the switching element is also connected to the Figure 5 Between both terminals of the monitor element Ex in the illustrated embodiment, the transistor Q1 is configured to be on / off controlled by a pulse signal from the timing controller 6 . Thereby, it is possible to prevent the deviation from the forward voltage caused by the aging change between the above-mentioned monitor element Ex and the display EL elements arranged on the light-emitting display panel, and by connecting the two terminals of the monitor EL element Ex to Sequentially set to the same potentia...

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Abstract

The present invention controls the constant current value supplied to the monitor element Ex based on the dimmer information, and obtains the forward voltage Vf generated at this time through the peak hold circuit (9). Based on the output of the peak hold circuit (9), the output voltage VH of the DC-DC converter (5) is controlled and provided as a driving voltage of the display panel. To prevent the deviation from the forward current caused by the aging change between the monitor element Ex and the display elements arranged on the light-emitting display panel, and to sequentially set the two terminals of the monitor element Ex to the same potential so as to To realize the effect of prolonging the life of the element, the switching transistor Q1 is connected in parallel with the element Ex for the monitor, and conducts on / off control. Even if the above-mentioned transistor Q1 is turned on / off, the above-mentioned peak hold circuit (9) can hold the peak value of the forward voltage Vf of the monitor element Ex regardless of this, so as to control the driving voltage VH of the above-mentioned converter (5). way to act.

Description

technical field [0001] The present invention relates to a driving device and a driving method for performing light-emitting driving on a display panel with many light-emitting elements arranged therein, and in particular to a light-emitting display panel that realizes brightness compensation corresponding to time-dependent changes of light-emitting elements and dimmer control Driving device and driving method. Background technique [0002] With the popularization of mobile phones and portable information terminals (PDAs), etc., there is an increasing demand for thin display panels that can display high-definition images and can achieve low power consumption. Existing liquid crystal display panels are used as Display panels satisfying this requirement are employed in many products. On the other hand, recently, a display panel using an organic EL (electroluminescence) element utilizing the characteristics of a self-luminous display element has been put i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/30G09G3/20G09G3/32H05B33/14H05B44/00
CPCG09G3/30G09G3/3216G09G3/3258G09G2320/0233G09G2320/029G09G2320/041G09G2320/043G09G2320/0633G09G2320/0666G09G2330/028
Inventor 早藤晶纪金内一浩
Owner TOHOKU PIONEER CORP