Display Device With Shared Drive Circuits for Reduced Pixel Pitch
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Solution Overview
Problem
Existing organic EL display devices face challenges in improving definition while maintaining a simple configuration and structure, particularly when reducing pixel pitch, as it requires shrinking the formation pitch of both light emitting elements and drive circuits, which is difficult due to the high voltage requirements.
Innovation Solution
The display device employs a configuration with multiple light emitting element groups arranged in different directions, each group containing light emitting units driven by specific drive circuits, where the number of drive circuits matches or is less than the number of light emitting elements, and signals are averaged across groups to optimize circuit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pixel pitch is reduced to improve definition, then the definition is improved, but the formation pitch of drive circuits must be reduced which is difficult due to high voltage requirements
Solution Approach 1:
Multiple light emitting elements (second and third light emitting elements) are driven by a single shared drive circuit instead of each element having its own dedicated drive circuit. This merging approach reduces the total number of drive circuits required, allowing for a larger formation pitch of drive circuits while maintaining high definition through reduced pixel pitch.
2Manufacturing precision
If the formation pitch of drive circuits is reduced to match reduced pixel pitch, then the definition is improved, but the structure becomes more complex and harder to manufacture
Solution Approach 1:
The patent combines multiple light emitting elements under a single drive circuit, reducing the number of separate drive circuits that need to be designed and manufactured. This merging simplifies the overall structure and manufacturing process while still achieving high definition through the reduced pixel pitch of the light emitting elements.
3Device complexity
If one drive circuit is provided for multiple light emitting elements, then the structure is simplified, but the number of drive circuits is reduced which may affect driving capability
Solution Approach 1:
The drive circuit is designed with multi-functionality to drive multiple light emitting elements (both second and third light emitting elements) through time-division or signal-division methods. This universal drive circuit performs multiple functions that would traditionally require separate dedicated circuits, maintaining driving capability while simplifying the overall structure.
Data Source
AI summary
Display devices are disclosed. In one example, a display device includes light emitting element groups each including light emitting element units, each of the light emitting element units including first, second and third light emitting elements. Each of the light emitting element groups includes first drive circuits that drive the first light emitting elements, second drive circuits that drive the second light emitting elements, and third drive circuits that drive the third light emitting elements, and in each of the light emitting element groups, the number of first drive circuits is equal to the number of first light emitting elements, the number of second drive circuits is less than the number of second light emitting elements, and the number of third drive circuits is less than the number of third light emitting elements.