Pixel structure of a sunlight readable display
AssigneeIndustrial Technology Research Institute
InventorsWen-Chun Wang, Lisen Chuang
Life of this patent
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Abstract
A display that is readable under direct sunlight comprises a half organic light emitting diode structure and a half reflective liquid crystal display structure. It uses a thin film transistor as a switch to solve the problem of crosstalk between the organic light emitting diode mode and the liquid crystal mode as well as the dc residual problem and has the advantages of both display structures. The data signals in organic light emitting diode mode and liquid crystal mode are controlled by different control systems. By properly selecting liquid crystal material and organic light emitting diode material such that the ranges of the data signals are similar, one data driver can be shared between the two modes.
Claims11
A pixel structure of a sunlight readable display, comprising:
- a first thin film transistor comprising a source electrode, a drain electrode and a gate electrode;
- a second thin film transistor comprising a source electrode, a drain electrode and a gate electrode, said gate electrode of said second thin film transistor being electrically connected to said drain electrode of said first thin film transistor;
- a first storage capacitor having one end electrically connected to said gate electrode of said second thin film transistor;
- a third thin film transistor comprising a source electrode, a drain electrode and a gate electrode, said drain electrode of said third thin film transistor being electrically connected to said drain electrode of said first thin film transistor;
- a second storage capacitor having one end electrically connected to said source electrode of said third thin film transistor and another end connected to a common bus, said second storage capacitor being a liquid crystal capacitor;
- and
- an organic light emitting diode display device electrically connected to said drain electrode of said second thin film transistor, said organic light emitting diode display device comprising a half organic light emitting diode display structure and a half reflective liquid crystal display structure;
- wherein said display is in an organic light emitting diode mode when said third thin film transistor is at an OFF state, and said display is in a liquid crystal mode when said third thin film transistor is at an ON state.
Dependencies are inferred from the claim text.