Bezel-less Display Module Stacked Driving Circuits
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Solution Overview
Problem
Conventional display modules with bezel areas restrict design and seamless image formation, especially in large area displays, due to the presence of second driving circuits in non-active areas, and face challenges in stable driving of inorganic light-emitting devices and color reproducibility.
Innovation Solution
A bezel-less display module design with first and second driving circuits integrated on a substrate, where first driving circuits drive inorganic light-emitting devices based on data voltages and second driving circuits generate control signals for the first driving circuits, utilizing a stack structure of metal layers and thin film transistors, and including pulse width modulation circuits for improved color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If second driving circuits are arranged in non-active area (bezel area), then control signals can be generated for first driving circuits, but bezel area restricts design freedom and prevents seamless image formation in large area displays
Solution Approach 1:
The patent moves the second driving circuits from the horizontal plane (bezel area) to the vertical dimension by stacking them on top of the first driving circuits using additional metal layers (M3, M4). This allows control signal generation without occupying lateral space, enabling bezel-less display designs while maintaining full design freedom.
Solution Approach 2:
The second driving circuits are nested within the same area as the first driving circuits by placing them in upper metal layers. This nested arrangement allows both driving circuit functions to coexist in the same footprint, eliminating the need for separate bezel areas and enabling seamless large area displays.
2Manufacturing precision
If first driving circuits are provided for each pixel to drive inorganic light-emitting devices, then color reproducibility can be improved, but device complexity increases
Solution Approach 1:
The patent combines the first and second driving circuits into a single integrated driving circuit layer by stacking them in the same area using multiple metal layers. This merging approach maintains the functional benefits of separate driving circuits for color reproducibility while reducing overall device complexity through spatial integration.
Solution Approach 2:
The stacked driving circuit structure serves multiple functions: the first driving circuits drive individual pixels for color control, while the second driving circuits generate control signals for the first driving circuits. This multi-functionality is achieved within a single integrated structure, improving color reproducibility without proportionally increasing complexity.
3Ease of operation
If clock signals are applied through second metal layer, then first driving circuits can be controlled, but signal interference may occur with data lines arranged in the same layer
Solution Approach 1:
The patent applies clock signals through the third metal layer (M3) instead of the second metal layer (M2), separating them vertically from data lines. This dimensional separation in the z-direction eliminates signal interference while maintaining ease of control for the first driving circuits.
Solution Approach 2:
The third metal layer acts as an intermediary layer that carries clock signals without interfering with data lines in the second metal layer. This intermediate structure enables clean signal transmission and control without harmful electromagnetic interference.
Data Source
AI summary
A display module is disclosed. The present display module comprises: a driving circuit layer provided on a substrate and comprising first driving circuits and second driving circuits; and a pixel array provided on the driving circuit layer and having pixels arranged in a matrix, the pixels each including a plurality of inorganic light-emitting devices, wherein: the first driving circuits provided for each pixel drive the plurality of inorganic light-emitting devices included in each pixel on the basis of data voltages applied through data lines; the second driving circuits generate control signals for driving the first driving circuits on the basis of clock signals applied through clock lines and provide same to the first driving circuits; the driving circuit layer comprises a first metal layer, a second metal layer, and at least one third metal layer; and the clock signals are applied from the clock lines to the second driving circuits through jumping lines formed in one of the at least one third metal layer.