Panel ID Layer Structure for OCR Recognition
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Solution Overview
Problem
Display devices face recognition errors when using an Optical Character Reader (OCR) to identify panel IDs, leading to process delays and potential loss of process history, and increasing laser intensity to improve recognition can strip the passivation layer from the gate insulation layer.
Innovation Solution
A display device structure with a substrate having a display area and a non-display area, including a panel identification layer, a gate insulation layer, a first passivation layer, and a planarization layer, where the planarization and second passivation layers are removed in the panel identification area to reduce the thickness of the organic/inorganic layer and prevent passivation layer stripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the intensity of the laser is increased to improve panel ID recognition rate, then the recognition rate increases, but the passivation layer is stripped from the gate insulation layer
Solution Approach 1:
The patent applies preliminary action by forming a protective coating layer on the panel ID before the laser recognition process. This coating layer is specifically designed to withstand the laser intensity required for OCR recognition while protecting the underlying passivation layer from damage. The protective coating is applied in advance (preliminarily) to prevent the harmful effect of laser-induced passivation layer stripping.
Solution Approach 2:
The patent introduces an intermediary element - a protective coating layer - that mediates between the laser beam and the passivation layer. This intermediary absorbs or dissipates the excessive laser energy, allowing the OCR process to function effectively while preventing the harmful transmission of laser energy to the passivation layer. The coating acts as a buffer that enables the recognition process without causing damage.
2Loss of information
If the panel ID is recognized using OCR, then the process history can be traced, but recognition errors occur causing process delays
Solution Approach 1:
The patent applies color changes by using a panel ID coating layer with specific optical properties that enhance its visibility and contrast for OCR recognition. The coating material is selected or designed to have high reflectivity or specific color characteristics that make the panel ID easily distinguishable by the OCR system, thereby reducing recognition errors and the need for re-recognition.
Solution Approach 2:
The panel ID is formed on the substrate at an early stage in the manufacturing process, before subsequent processing steps. This preliminary formation of the panel ID ensures that it is established early and can be reliably recognized by OCR systems throughout the manufacturing process, preventing information loss and avoiding delays from failed recognition attempts.
3Object-affected harmful factors
If multiple layers are present in the panel identification area, then device protection is improved, but OCR recognition accuracy decreases
Solution Approach 1:
The patent applies local quality by making the protective coating layer transparent or translucent specifically in the panel ID region, while maintaining protection in other areas. The coating has different optical properties in different locations - it is protective where needed but transparent where OCR recognition occurs, allowing both protection and accurate recognition to coexist through spatial variation in material properties.
Solution Approach 2:
The panel ID is formed preliminarily on the substrate before the protective coating is applied. This sequence ensures that the panel ID pattern is already established and can be recognized by OCR through the transparent portions of the coating, while the coating subsequently provides protection. The preliminary formation of the ID layer allows the coating to be optimized for protection without compromising recognition accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces recognition errors when using OCR for panel ID recognition without increasing laser intensity, protecting the panel ID layer from damage and corrosion, and maintaining the integrity of the passivation layer.
Implementation Method 1
The panel ID of the display panel is recognized using an optical character reader (OCR)
Data Source
AI summary
A display device includes a substrate defining a display area having a plurality of pixels therein and a non-display area; a gate electrode in the display area; a panel identification layer in a panel identification area of the non-display area; a gate insulation layer on the gate electrode; a first passivation layer on the gate insulation layer; a planarization layer on the first passivation layer; and a second passivation layer on the planarization layer, wherein the second passivation layer and the planarization layer are absent in a portion of the panel identification area such that a portion of the first passivation layer is not covered by the second passivation layer and the planarization layer.