Cascade Display Driver Gamma Voltage Uniformity
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Solution Overview
Problem
In cascade applications, non-ideal manufacturing and designing processes lead to non-uniform driving voltages generated by multiple driver ICs for display panels, resulting in display quality issues such as the two-band phenomenon.
Innovation Solution
A display driver system comprising a first and second driver integrated circuit with gamma voltage generators, where output terminals of one IC are electrically coupled to corresponding terminals of the other IC to generate common gamma voltages, which are then provided to both ICs to drive the display panel, ensuring uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple driver ICs are used to drive a display panel in cascade application, then the display area is increased and more pixels can be driven, but the driving voltages generated by different driver ICs become non-uniform due to manufacturing and designing variations, resulting in display quality degradation
Solution Approach 1:
The patent merges the gamma voltage generation functions of multiple driver ICs by electrically coupling corresponding output terminals of gamma voltage generators from different driver ICs. This allows multiple generators to cooperate and output a unified common gamma voltage, ensuring voltage uniformity across the expanded display area while maintaining the benefits of cascade configuration.
2Device complexity
If each driver IC independently generates gamma voltages, then the device complexity is reduced and each IC operates autonomously, but the display uniformity deteriorates due to voltage differences between different ICs
Solution Approach 1:
The patent introduces an electrical coupling mechanism as an intermediary between the gamma voltage generators of different driver ICs. This coupling connects corresponding output terminals and enables the generators to cooperate, producing a unified common gamma voltage that ensures display uniformity while maintaining relatively simple individual IC structures.
3Stability of the object's composition
If common gamma voltages are generated by electrical coupling of output terminals from multiple driver ICs, then the display uniformity is improved, but the device complexity increases due to additional electrical connections and coordination
Solution Approach 1:
The patent applies local quality by selectively coupling only corresponding output terminals of gamma voltage generators that require coordination, rather than coupling all possible terminals. This targeted approach achieves the necessary display uniformity while minimizing the increase in device complexity by focusing coupling only where needed.
Data Source
AI summary
A display driver that includes a first driver integrated circuit being cascaded to a second driver integrated circuit is introduced. The first driver integrated circuit includes a first gamma voltage generator that is configured to output a plurality of first gamma voltages to output terminals of the first gamma voltage generator. The second driver integrated circuit includes a second gamma voltage generator that is configured to output a plurality of second gamma voltages to output terminals of the second gamma voltage generator. Each of the output terminals of the first gamma voltage generator is corresponded to one of the output terminals of the second gamma voltage generator. At least one of the output terminals of the first gamma voltage generator is electrically coupled to the corresponding one of the output terminals of the second gamma voltage generator to output at least one common gamma voltage of the first gamma voltages and the second gamma voltages. A method adapted to the display driver is also introduced.